Adolescence Summary 1 Essay Example

Adolescence Summary 1 Essay Adolescence (from Latin: adolescere meaning to grow up)[1] is a transitional stage of physical and mental human development generally occurring between puberty and legal adulthood (age of majority),[1] but largely characterized as beginning and ending with the teenage stage. [2][3][4] According to Erik Eriksons stages of human development, for example, a young adult is generally a person between the ages of 20 and 40, whereas an adolescent is a person between the ages of 13 and 19. 3][4] Historically, puberty has been heavily associated with teenagers and the onset of adolescent development. [5][6] However, the start of puberty has had somewhat of an increase in preadolescence (particularly females, as seen with early and precocious puberty), and adolescence has had an occasional extension beyond the teenage years (typically males) compared to previous generations. These changes have made it more difficult to rigidly define the time frame in which adolescence occurs. [7][8][9][10] The end of adolescence and the beginning of adulthood varies by country and by function, and furthermore even within a single nation-state or culture there can be different ages at which an individual is considered to be (chronologically and legally) mature enough to be entrusted by society with certain tasks. Such milestones include, but are not limited to, driving a vehicle, having legal sexual relations, serving in the armed forces or on a jury, purchasing and drinking alcohol, voting, entering into contracts, completing certain levels of education, and marrying. Adolescence is usually accompanied by an increased independence allowed by the parents or legal guardians and less supervision, contrary to the preadolescence stage. Contents [hide] 1 History 2 Puberty 3 Psychology 4 Sexuality 5 Culture 6 Legal issues, rights and privileges 7 See also 7. 1 Human development and psychology 7. 1. 1 Compare with 7. 2 Literature 8 References [edit] History In many societies, adolescence was not recognized as a phase of life. Most societies simply distinguished between childhood and adulthood. Stanley Hall is generally credited with discovering adolescence with his 1904 study Adolescence in which he describes the developmental phase now recognized as adolescence. Hall attributed the new stage to social changes at the turn of the 20th century. Child labor laws kept individuals under 16 out of the work force, and universal education laws kept them in secondary school, thus prolonging the period of dependence — a dependence that allowed them to address psychological tasks they might have ignored when they took on adult roles straight out of childhood. 11] [edit] Puberty Upper body of teenage boy. The structure has changed to resemble an adult form. Main article: Puberty Puberty is a period of several years in which rapid physical growth and psychological changes occur, culminating in sexual maturity. The average onset of puberty is at 10 for girls and age 12 for boys. [12] Every persons individual timetable for puberty is influenced primarily by heredity, although envi ronmental factors, such as diet and exercise, also exert some influence. 12][13][14] These factors can also contribute to precocious puberty and delayed puberty. [10][14] Puberty begins with a surge in hormone production, which in turn causes a number of physical changes. [12] It is also the stage of life in which a child develops secondary sex characteristics (for example, a deeper voice and larger adams apple in boys, and development of breasts and more curved and prominent hips in girls) as his or her hormonal balance shifts strongly towards an adult state. This is triggered by the pituitary gland, which ecretes a surge of hormonal agents into the blood stream, initiating a chain reaction. The male and female gonads are subsequently activated, which puts them into a state of rapid growth and development; the triggered gonads now commence the mass production of the necessary chemicals. The testes primarily release testosterone, and the ovaries predominantly dispense estrogen. The production of these hormones increases gradually until sexual maturation is met. Some boys may develop gynecomastia due to an imbalance of sex hormones, tissue responsiveness or obesity. [15][16] We will write a custom essay sample on Adolescence Summary 1 specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Adolescence Summary 1 specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Adolescence Summary 1 specifically for you FOR ONLY $16.38 $13.9/page Hire Writer Facial hair in males normally appears in a specific order during puberty: The first facial hair to appear tends to grow at the corners of the upper lip, typically between 14 to 16 years of age. [17][18] It then spreads to form a moustache over the entire upper lip. This is followed by the appearance of hair on the upper part of the cheeks, and the area under the lower lip. [17] The hair eventually spreads to the sides and lower border of the chin, and the rest of the lower face to form a full beard. [17] As with most human biological processes, this specific order may vary among some individuals. Facial hair is often present in late adolescence, around ages 17 and 18, but may not appear until significantly later. [18][19] Some men do not develop full facial hair for 10 years after puberty. [18] Facial hair will continue to get coarser, darker and thicker for another 2–4 years after puberty. [18] The major landmark of puberty for males is the first ejaculation, which occurs, on average, at age 13. [20] For females, it is menarche, the onset of menstruation, which occurs, on average, between ages 12 and 13. [13] The age of menarche is influenced by heredity, but a girls diet and lifestyle contribute as well. 13] Regardless of genes, a girl must have certain proportion of body fat to attain menarche. [13] Consequently, girls who have a high-fat diet and who are not physically active begin menstruating earlier, on average, than girls whose diet contains less fat and whose activities involve fat reducing exercise (e. g. ballet and gymnastics). [13][14] Girls who experience malnutrition or are in societies in which children are expected to perform physical labor also begin menstruating at later ages. [13] The timing of puberty can have important psychological and social consequences. Early maturing boys are usually taller and stronger than their friends. [21] They have the advantage in capturing the attention of potential partners and in becoming hand-picked for sports. Pubescent boys often tend to have a good body image, are more confident, secure, and more independent. [22] Late maturing boys can be less confident because of poor body image when comparing themselves to already developed friends and peers. However, early puberty is not always positive for boys; early sexual maturation in boys can be accompanied by increased aggressiveness due to the surge of hormones that affect them. 22] Because they appear older than their peers, pubescent boys may face increased social pressure to conform to adult norms; society may view them as more emotionally advanced, despite the fact that their cognitive and social development may lag behind their appearance. [22] Studies have shown that early maturing boys are more likely to be sexually active and are more likely to par ticipate in risky behaviors. [23] For girls, early maturation can sometimes lead to increased self-consciousness, though a typical aspect in maturing females. 24] Because of their bodies developing in advance, pubescent girls can become more insecure. [24] Consequently, girls that reach sexual maturation early are more likely than their peers to develop eating disorders. Nearly half of all American high school girls diet is to lose weight. [24] In addition, girls may have to deal with sexual advances from older boys before they are emotionally and mentally mature. [25] In addition to having earlier sexual experiences and more unwanted pregnancies than late maturing girls, early maturing girls are more exposed to alcohol and drug abuse. 26] Those who have had such experiences tend to perform less well in school than their inexperienced age peers. [27] Girls have usually reached full physical development by ages 15–17,[28][29][30] while boys usually complete puberty by ages 16–18. [28][29][31] Any increas e in height beyond these ages is uncommon. Girls attain reproductive maturity about 4 years after the first physical changes of puberty appear. [30] In contrast, boys accelerate more slowly but continue to grow for about 6 years after the first visible pubertal changes. 22][31] Teenage and early adult males may continue to gain natural muscle growth even after puberty. [22] Approximate outline of development periods in child and teenager development. Adolescence is marked in red at top right. [edit] Psychology Main article: Adolescent psychology Expressed hostile attitude of a teenage girl. Adolescence is characterized by a number of cognitive, emotional, physical and attitudinal changes, which can be a cause of conflict on one hand and positive personality development on the other. The home environment and parents are still important for the behaviors and choices of adolescents. 32] Adolescents who have a good relationship with their parents are less likely to engage in various risk behaviors, such as smoking, drinking, fighting, and/or sexual intercourse. [32] In conflict with their parents, adolescents are more flexible than younger children, but more hostile and rigid compared to adults. The topics of conflicts between adolescents and their parents are often about the extent to which parents can control and supervise the adolescent, for instance conflicts about chores, schoolwork, curfew, and the adolescents right to privacy. 33] For the first time in their lives adolescents may start to view their friends, their peer group, as more important and influential than their parents or guardians. [34] Peer groups offer its members the opportunity to develop various social skills, such as empathy, sharing and leadership. Peer groups can have positive influences on an individual, for instance on academic motivation and performance, but they can also have negative influences and lead to an increase in experimentation with drugs, drinking, vandalism, and stealing. 35] Susceptibility to peer pressure increases during early adolescence, peaks around age 14, and declines thereafter. [36] In the search for a unique social identity for themselves, adolescents are frequently confused about what is right and what is wrong. G. Stanley Hall denoted this period as one of Storm and Stress and, according to him, conflict at this developmental stage is normal and not unusual. Margaret Mead, on the other hand, attributed the behavior of adolescents to their culture and upbringing. [37] Adolescence is also a time for rapid cognitive development. [38] Piaget describes adolescence as the stage of life in which the individuals thoughts start taking more of an abstract form and the egocentric thoughts decrease. This allows the individual to think and reason in a wider perspective. [39] A combination of behavioural and fMRI studies have demonstrated development of executive functions, that is, cognitive skills that enable the control and coordination of thoughts and behaviour, which are generally associated with the prefrontal cortex. 40] The thoughts, ideas and concepts developed at this period of life greatly influence ones future life, playing a major role in character and personality formation. [41] Adolescent psychology is associated with notable changes in mood sometimes known as mood swings. [citation needed] Positive psychology is sometimes brought up when addressing adolescent psychology as well. This approach towards adolescents refers to providing them with mo tivation to become socially acceptable and notable individuals, since many adolescents find themselves bored, indecisive and/or unmotivated. [42] Struggles with adolescent identity and depression usually set in when an adolescent experiences a loss. The most important loss in their lives is the changing relationship between the adolescent and their parents. Adolescents may also experience strife in their relationships with friends. This may be due to the activities their friends take part in, such as smoking, which causes adolescents to feel as though participating in such activities themselves is likely essential to maintaining these friendships. Teen depression can be extremely intense at times because of physical and hormonal changes but emotional instability is part of adolescence. Their changing mind, body and relationships often present themselves as stressful and that change, they assume, is something to be feared. [43] Sleep deprivation has also been linked to adolescent depression, particularly in the teen years. [44] Views of family relationships during adolescence are changing. The old view of family relationships during adolescence put an emphasis on conflict and disengagement and thought storm and stress was normal and even inevitable. However, the new view puts emphasis on transformation or relationships and maintenance of connectedness. [citation needed] edit] Sexuality Main article: Adolescent sexuality Adolescent sexuality refers to sexual feelings, behavior and development in adolescents and is a stage of human sexuality. Sexuality and sexual desire usually begins to intensify along with the onset of puberty. The expression of sexual desire among adolescents (or anyone, for that matter), might be influenced by family values and the culture and rel igion they have grown up in (or as a backlash to such), social engineering, social control, taboos, and other kinds of social mores. Teenage couples at a fair in the American West. In contemporary society, adolescents also face some risks as their sexuality begins to transform. Whilst some of these such as emotional distress (fear of abuse or exploitation) and sexually transmitted diseases (including HIV/AIDS) may not necessarily be inherent to adolescence, others such as pregnancy (through non-use or failure of contraceptives) are seen as social problems in most western societies. In terms of sexual identity, while all sexual orientations found in adults are also represented among adolescents, statistically the suicide rate amongst LGBT adolescents is up to four times higher than that of their heterosexual peers. 45] According to anthropologist Margaret Mead and psychologist Albert Bandura,[citation needed] the turmoil found in adolescence in Western society has a cultural rather than a physical cause; they reported that societies where young women engaged in free sexual activity had no such adolescent turmoil. In a 2008 study conducted by YouGov for Channel 4 , 20% of 14? 17-year-olds surveyed revealed that they had their first sexual experience at 13 or under. [46] Another study from 2002 found that those aged 15–44 reported that the average age of first sexual intercourse was 17. for males and 17. 3 for females. [47] The age of consent to sexual activity varies widely between international jurisdictions, ranging from 12 to 21 years. [48] [edit] Culture Main article: Youth subculture In commerce, this generation[clarification needed] is seen as an important target. Mobile phones, contemporary popular music, movies, television programs, websites, sports, video games and clothes are heavily marketed and often popular amongst adolescents. In the past (and still in some cultures) there were ceremonies that celebrated adulthood, typically occurring during adolescence. Seijin shiki (literally adult ceremony) is a Japanese example of this. Upanayanam is a coming of age ceremony for males in the Hindu world. In Judaism, 13-year-old boys and 12-year-old girls become Bar or Bat Mitzvah, respectively, and often have a celebration to mark this coming of age. Among some denominations of Christianity, the rite or sacrament of Confirmation is received by adolescents and may be considered the time at which adolescents become members of the church in their own right (there is also a Confirmation ceremony in some Reform Jewish temples, although the bar or bat mitzvah ceremony appears to have precedence). In United States, girls will often have a sweet sixteen party to celebrate turning the aforementioned age, a tradition similar to the quinceanera in Latin culture. In modern western society, events such as getting your first drivers license, high school and later on college graduation and first career related job are thought of as being more significant markers in transition to adulthood. Adolescents have also been an important factor in many movements for positive social change around the world. The popular history of adolescents participating in these movements may perhaps start with Joan of Arc, and extend to present times with popular youth activism, student activism, and other efforts to make the youth voice heard. [edit] Legal issues, rights and privileges Internationally, those who reach a certain age (often 18, though this varies) are legally considered to have reached the age of majority and are regarded as adults and are held to be responsible for their actions. People below this age are considered minors or children. A person below the age of majority may gain adult rights through legal emancipation. Those who are under the age of consent, or legal responsibility, may be considered too young to be held accountable for criminal action. This is called doli incapax or the defense of infancy. The age of criminal responsibility varies from 7 in India to 18 in Belgium. After reaching the initial age, there may be levels of responsibility dictated by age and type of offense, and crimes committed by minors may be tried in a juvenile court. The legal working age in Western countries is usually 14 to 16, depending on the number of hours and type of employment. In the United Kingdom and Canada, for example, young people between 14 and 16 can work at certain types of light work with some restrictions to allow for schooling; while youths over 16 can work full-time (excluding night work). Many countries also specify a minimum school leaving age, ranging from 10 to 18, at which a person is legally allowed to leave compulsory education. The age of consent to sexual activity varies widely between jurisdictions, ranging from 13 to 21 years, the average age is 16. [49] In a 2008 study of 14 to 17-year-olds conducted by YouGov for Channel 4, it was revealed that one in three 15-year-olds were sexually active. [46] Sexual intercourse with a person below the local age of consent is usually treated as the crime of statutory rape. Some jurisdictions allow an exemption where both partners are close in age; for example, a 16-year-old and an 18-year-old. The age at which people are allowed to marry also varies, from 17 in Yemen to 22 for males and 20 for females in China. In Western countries, people are typically allowed to marry at 18, although they are sometimes allowed to marry at a younger age with parental or court consent. In developing countries, the legal marriageable age does not always correspond with the age at which people actually marry; for example, the legal age for marriage in Ethiopia is 18 for both males and females, but in rural areas most girls are married by age 16. In most democratic countries, a citizen is eligible to vote at 18. For example, in the United States, the Twenty-sixth amendment decreased the voting age from 21 to 18. In a minority of countries, the voting age is 17 (for example, Indonesia) or 16 (for example, Brazil). By contrast, some countries have a minimum voting age of 21 (for example, Singapore) whereas the minimum age in Uzbekistan is 25. Age of candidacy is the minimum age at which a person can legally qualify to hold certain elected government offices. In most countries, a person must be 18 or over to stand for elected office, but some countries such as the United States and Italy have further restrictions depending on the type of office. A sign outside a sex shop reads Must Be 18 To Enter in Chapel Hill, North Carolina. The sale of selected items such as cigarettes, alcohol, and videos with violent or pornographic content is also restricted by age in most countries. In the U. S, the minimum age to buy an R-rated movie, M-rated game or an album with a parental advisory label is 17 (in some states 18 or even 21). In practice, it is common that young people engage in underage smoking or drinking, and in some cultures this is tolerated to a certain degree. In the United States, teenagers are allowed to drive between 14–18 (each state sets its own minimum driving age of which a curfew may be imposed), in the US, adolescents 17 years of age can serve in the military. In Europe it is more common for the driving age to be higher (usually 18) while the drinking age is lower than that of the US (usually 16 or 18). In Canada, the drinking age is 18 in some areas and 19 in other areas. In Australia, universally the minimum drinking age is 18, unless a person is in a private residence or is under parental supervision in a licensed premises. The driving age varies from state to state but the more common system is a graduated system of L plates (a learning license that requires supervision from a licensed driver) from age 16, red P plates (probationary license) at 17, green P plates at 18 and finally a full license, i. e. for most people around the age of 20. The legal gambling age also depends on the jurisdiction, although it is typically 18. The minimum age for donating blood in the U. S is 17 although it may be 16 with parental permission in some states such as New York, New Jersey, Wisconsin, and Pennsylvania. [citation needed] Suitable age and discretion is a legal definition of maturity. [50] A number of social scientists, including anthropologist Margaret Mead and sociologist Mike Males, have noted the contradictory treatment of laws affecting adolescents in the United States. As Males has noted, the US Supreme Court has, explicitly ruled that policy-makers may impose adult responsibilities and punishments on individual youths as if they were adults at the same time laws and policies abrogate adolescents’ rights en masse as if they were children. [citation needed] The issue of youth activism affecting political, social, educational, and moral circumstances is of growing significance around the world. Youth-led organizations around the world have fought for social justice, the youth vote seeking to gain teenagers the right to vote, to secure more youth rights, and demanding better schools through student activism. Since the advent of the Convention on the Rights of the Child in 1989 (children defined as under 18), almost every country (except the U. S. Somalia) in the world has become voluntarily legally committed to advancing an anti-discriminatory stance towards young people of all ages. This is a legally binding document which secures youth participation throughout society while acting against unchecked child labor, child soldiers, child prostitution, and pornography.

Essay Com

Essay Com Nowadays the global network Internet is overfilled with custom essay companies and essay writing agencies which offers a huge number of services such as writing, editing, proofreading, pre-writing, re-writing and others. Such essay companies provide students and young people with custom written essays, term papers, research papers, dissertations and other written assignments in exchange of money. They hire highly qualified freelance essay writers all over the world for writing academic papers for them. Unfortunately, there are also a lot of scam or fraudlent writing sites that are committed to cheat people delivering plagiarized pre-written papers stolen from free essay sites or essay databases. What is essay com? A lot of students all over the world prefer using essay companies to writing essays on their own. This occurs due to a lack of time or laziness. Some of them are looking for essay writing services in the Internet surfing Google and Yahoo search engines. Essay com is an abbreviation of the word essay company. It is one of the most popular keyword typed by students in search engines. Such a category of young people is fond of visiting web sites domains of which end in com, org and net. After typing essays com this or that search engine instantly gives all results with domains containing words essay and com. If you are looking for professional custom essay writing companies that are committed to deliver custom essays written from scratch by professional academic writers you have a lot of options which company of service you can choose according to your demands, prices and quality. Go ahead and beware of cheating companies on the web.

Entrpreneurship Essay Example | Topics and Well Written Essays - 750 words

Entrpreneurship - Essay Example On the other hand, sustainable entrepreneurs are entrepreneurs or firms that work in a sustainable manner and contribute to the creation of sustainable development (Weidinger et al., 2013). Sustainable development has grown significantly for the past few decades; people and corporate have come to realizes that is easy to do business sustainably. They noted that doing businesses is quite easy at the same time trying to solve issues facing the society. According to the view of sustainable entrepreneurs, challenges can be easily solved and at the same time create business strategies that have more value to the society and economy. Current society is characterized by high level of environmental destruction, climate change, and ozone depletion; such practices pose a great danger to us and the needs of futures generations. However, with sustainable entrepreneurship, environment will be safe, destruction of forest will reduce, and improvement of agricultural practices will increase. In addition, sustainable entrepreneurship is a vital opportunity to developing countries. It improves and increase access to education, creates more job opportunities, increase productivity, physical health and economy (Rendtorff, 2009). Additionally, motivations to sustainable entrepreneurship are changes in environmental businesses, in this sense, the change in demand and supply. Such change motivates an entrepreneur to stand tall and focus of sustainable entrepreneurship. A change is an opportunity; an opportunity in this perspective is availability of raw materials to start a business. It is an ethical responsibility of business firms to be more concern about sustainability; at the same time it is also legal for business to be a concern. Currently, businesses are no longer viewed by the capability to avail goods and services but, the way the avail such commodities and impacts on the society. The main aspects which businesses are more concern with are; environmental,

Devil's Knot Essay Example | Topics and Well Written Essays - 500 words

Devil's Knot - Essay Example They arrested the three teenagers only on the basis of doubt and items possessed. Interrogation was done without the presence of any of the parents of the three teenagers or even the attorney. The crime seen was repeatedly changed and re recorded from the three teenagers to suite the situation and the time of the murder so that the post mortem report should also match the same time as recorded by the police. At one point the boy said they skipped the school and the murder took place in the afternoon, which did not match the murder time, and so they were encouraged to change the time of the murder. The crime sent shock waves to the entire Arkansas City and terrible tragedy what these three little boys went though before their deaths had to be painful terror. The stepfather of one of the accused was very abusive and always lied and was very much ready for the cameras always and the Press thought that this stepfather was involved with the police. The police than to accept the crime that they never committed left the three teenagers with no option. As the interrogation continued the case caught a wild fire by the press and the media and always featured as breaking news by the TV and new paper. Feeling the pressure the police had to bring the accused before the press show every body that they are already on the job.

Qualitative data analysis report Essay Example | Topics and Well Written Essays - 1750 words

Qualitative data analysis report - Essay Example Additionally, the ease of reading the Terms and the ability of a site to secure privacy are also influencing factors. This paper concludes with a discussion of the results and brief literature review on the topic. The aim of this study is to explore better understanding of the interaction with Term and Condition among Thai student in different digital environment. This research is intended to figure out the ease in which Thai students understand Terms and Condition. The debate about the interaction between Terms and Conditions has been on the rise. This paper will provide further literature on this topic. By listening and writing down the views of Thai young individuals, the paper examines how loyalty, trust, privacy and security, and issues of terms and conditions impact the interaction. The research was conducted with a qualitative focus. Interaction of Terms and Conditions is a social experience. Exploring the interaction of students to Terms and Conditions through a qualitative focus means the interaction can be understood from both personal and social perspective. I conducted intensive individual interviews with a small number of respondents to explore their perspectives on the research question. The questions inquired the participants about their experiences and expectations related to the research question, the thoughts they have concerning online security, and about any changes they perceive in themselves as a result of their involvement in the study. In-depth interviews helped a lot when deriving detailed information about a person’s thoughts and behaviours. It offered a complete picture of the research question. It was used in place of focus groups and used to refine questions for future surveys of a particular group. In-depth interviews provide more detailed information than what is available through other data collection methods, such as surveys. It provided a more relaxed atmosphere in which to

Electrical Bone Growth Stimulator Devices

Electrical Bone Growth Stimulator Devices Nonunion and delayed fractures are prevalent in the United States, accounting for a significant health care cost (Simon Simon, 2008). Bone is able to remodel and adapt to applied loads and electromechanical stimuli (Smeltzer, Bare, Hinkle, Cheever, 2009). One method of repairing these types of fractures is with an electric bone growth stimulator, which has been used for over 25 years. There are three types of electric bone growth stimulators, all of which provide an electric current to the bone that causes the bone cells to grow and proliferate. Treatment with bone growth stimulators shortens the recovery time, however cannot be used for large gaps in the bone (Simon Simon, 2008). Clinical Significance Every year in the United States 7.9 million fractures occur (Goldstein, Sprague, Petrisor, 2010). Approximately 600,000 fractures do not heal properly. Fractures that do not heal properly are usually delayed or nonunion fractures. These fractures require treatment or surgical intervention to heal properly and cost the United States $3 to 6 billion health care dollars each year (Simon Simon, 2008). A delayed union is a fracture that heals very slowly and does not heal within a normal amount of time. Although many factors affect how long it takes for a bone to heal such as which bone is broken and the severity of the fracture, the typical healing time is about three to four months. A delayed union can be caused by several factors including, poor blood supply, not casting the bone properly, and infection (Parker, 2010). Sometimes delayed union fractures can heal on their own without intervention or treatment. A nonunion is a fracture that does not heal within twice the expected healing time, generally six to nine months after the injury. Fibrocartilage also forms between the two pieces of broken bone (Mora, Pedrotti, Galli, 2006). Figure 1 shows a nonunion fracture of the tibia, the fracture is circled in red and you can see some of the fibrocartilage that formed between the two pieces of bone. Several factors that can cause nonunion are poor blood supply, not casting the bone p roperly, infection, and loss of bone or soft tissue (Parker, 2010). A nonunion fracture will not heal on its own and requires some form of intervention. Some of the options for treating nonunion are internal and external fixation devices, bone grafts, bone substitutes, biologics like platelet extracts and bone morphogenic proteins, and biophysical stimulation including ultrasound and electrical stimulation (Simon Simon, 2008). Since the repair of delayed and nonunion fractures requires intervention and treatment, the clinical problem is how to provide an intervention that allows the patient to recover from the injury in the shortest possible amount of time with the fewest complications and the least cost (Simon Simon, 2008). The ideal treatment is to repair the fracture without surgery and hospitalization (Goldstein, Sprague, Petrisor, 2010). Therefore, electrical bone growth stimulators are frequently used to treat delayed and nonunion fractures. Research has shown that electrical stimulation is a prevalent treatment that is utilized to speed up the process of healing in delayed and nonunion fractures. In the United States, electrical bone growth stimulators have treated approximately 400,000 delayed and nonunion fractures (Goldstein, Sprague, Petrisor, 2010). Electrical bone growth stimulators, shown in Figure 2, are therapeutic devices that are used to produce and apply electric fields to bone, similar to the electric fields that occur naturally inside the body but as a result of the injury are either not being produced fast enough or are not being produced at all (Goldstein, Sprague, Petrisor, 2010). Electrical bone growth stimulators have been shown to be 88% effective for treating delayed and nonunion fractures (Nolte, van der Krans, Patka, Janssen, Ryaby, Albers, 2001). The typical treatment time with an electrical bone growth stimulator is between three and six months (Simon Simon, 2008). Biology and Physiology Humans have 206 bones in their body (Smeltzer, Bare, Hinkle, Cheever, 2009). Bone can adapt and remodel as a result of an applied force, an injury or a stimulus. Bone is made up of three types of cells, osteoblasts, osteocytes, and osteoclasts, which are involved in bone formation and remodeling. Osteoblasts are cells that form bone (Smeltzer, Bare, Hinkle, Cheever, 2009). Osteocytes are formed from osteoblasts and are responsible for maintaining bone, whereas, osteoclasts are cells that absorb bone. These cells play an important role in fracture healing (Smeltzer, Bare, Hinkle, Cheever, 2009). The process of healing a fracture, shown in Figure 3, has four major steps. The first step occurs within hours following the injury and lasts for about a week. During this step, the injury causes increased blood flow and bleeding, causing a hematoma to form. This results in inflammation and swelling (Smeltzer, Bare, Hinkle, Cheever, 2009). The next step begins when fibroblasts reach the injury site then release collagen fibers and form a soft fibrocartilaginous callus between and around the two pieces of bone. The third step begins around week 4, when osteoblasts enter the callus, multiply and begin to form bone. This forms a harder bony callus that eventually turns into bone. The final stage is remodeling which starts around week 17 and continues until the bone is completely healed. During the remodeling stage, the callus is completely turned into bone by the osteoblasts, and the osteoclasts absorb the extra bone that was produced and not needed (Chiras, 2008). Market Trends The market for electrical bone growth stimulators has grown to over $500 million dollars in the last 25 years, and by 2012 the market is expected to rise to $690.1 million (Schenberger, 2007). The consumers of electrical bone growth stimulators are hospitals, orthopedic surgeons and patients with a delayed or nonunion bone fracture. Electrical bone growth stimulators have been used to treat 400,000 fractures (Simon Simon, 2008). These devices can be both invasive and noninvasive. The typical cost for a noninvasive electrical bone growth stimulator is between $3000 and $7000 and can increase to $20,000 for an invasive stimulator that requires two surgeries (Morone Feuer, 2003). Insurance will cover the cost of the device as long as the patient meets certain criteria, for example the gap between the bones must be less than 1 centimeter (CIGNA , 2010). This cost is much less than the approximately $27,000 cost for surgery and hospitalization after a procedure such as internal fixation (Hughes Anglen, 2010). Seven companies have received FDA approval (U.S. Food and Drug Administration, 2010) and the five companies that have electric bone growth stimulators on the market are Orthofix, Biomet, DJ Orthopedics (acquired the company Orthologic), Smith and Nephew and DePuy Spine (medcompare, 2010). The only company that has received FDA approval (U.S. Food and Drug Administration, 2010) and that has invasive electric bone growth stimulators on the market is Biomet (medcompare, 2010). Some of the noninvasive stimulators are shown in Figure 4 and two of the invasive stimulators from Biomet are shown in Figure 5. Bioelectric Principles Bone that goes through effective growth or repair holds an electronegative potential compared to that of resting bone (Glazer Glazer, 2001). In bone where a break or fracture has occurred with nonunion or delayed union, it has been found helpful to introduce electric stimuli to the area undergoing complications. The introduction of an electrical current allows the process of bone regeneration to reinitiate. The electrically charged particles within the current act as the missing catalyst for the necessary chemical reactions to stimulate the desired biological response of bone repair at the site of nonunion. Pulsed electrical stimulation can cause changes in the intracellular level of cyclic adenosine monophosphate (cAMP) and thus triggers DNA synthesis within cells (Somjen, Fischler, Binderman, 1984). The electrical current excites the Na+/K+ pump of mesenchymal osteoblasts, which causes them to differentiate into osteoblasts that produce a woven matrix of bone (Shapiro, 2008).The electronegative current (DNA synthesis) applied at the surface of the fracture site or at the surface of the skin initiates endochondral bone formation the synthesis of cartilage, closely followed by bone formation (Shapiro, 2008). Bone naturally generates an electrical field because of Wolffs Law and piezoelectric properties, which is what the electric bone growth stimulators are also based off of. Wolffs law states that bone changes its external shape and internal (cancellous) architecture in response to stresses acting on it (Hunt, 2008). Piezoelectricity (Figure 6) is the stress-generated potentials in bone in which the side of the bone under mechanical compression [becomes] electronegative and the side under tension [becomes] electropositive (Kim, Won-Ki, Sung Jac, 1984). The mineral matrix in bone is piezoelectric because of the applied force to the skeletal system from tension (resting bone), and it changes its charge when the bone is under mechanical compression (bone repair/hematoma). The electric field produces electric potentials that cause the bone cells to grow and proliferate (Kim, Won-Ki, Sung Jac, 1984). Electrical stimulation creates an increased regulation of osteoinductive growth factors as well as enhancing osteoblastic activity, and decreasing osteoclastic activity through electrochemical reactions. This all leads to the desired reactions of increased bone formation and repair. The electrical stimulation increases the transmembrane calcium translocation, which activates calmodulin, a calcium binding protein involved in inflammation (Hematoma). Electric stimuli also brings about the upregulation of BMP-2, BMP-6, BMP-7, and the BMP receptor ALK-2, which are all bone morphogenic proteins needed to promote bone regeneration (Gan, Fredericks, Glazer, 2004). At the cathode of the Electric Bone Growth Stimulator, when the electric impulse is applied, three things happen: 1) the local oxygen concentration decreases, causing an increase in the biological process of bone growth, 2) the pH level increases, resulting in a decrease of osteoclastic function, and 3) the release of hydrogen pe roxide causing macrophages to release VEGF, which stimulates the growth of blood vessels in the area of injury. These growth factors enter the tissue matrix and trigger proliferation and differentiation which causes bone to form, thus increasing the healing rate of delayed union or nonunion (Gan, Fredericks, Glazer, 2004). History Device History The history of Bone Electric Growth Stimulators dates back to the late 1780s when the biologist, Luigi Galvani used electricity on a biological system. Galvani discovered that a frog could generate muscle spasms throughout its body when an electrical charge was applied to its spinal cord. Alessandro Volta, a colleague of Galvanis, was able to reproduce these (SilcoTek, 2010). The first documentation of electrical stimulation being used to heal fractures was in 1841 by Dr. Hartshorne, when he reported that a patient with a tibial nonunion was treated with electricity. In 1850, the scientist R. W. Lente was the first to report successful use of Galvanic currents used to treat patients with nonunion. In 1892, the German scientist Wolff was the first to describe how bone formed in response to stress; this description became known as Wolffs Law (Glazer Glazer, 2001). The significant gains of healing with electrical stimulation in the 17 1800s ends with Wolffs phenomenon description of bone formation. The modern theories that the Electric Bone Growth Stimulators are based off of are from the work that Iwao Yasuda and his colleagues found in the 1950s. In 1938 Yasuda started researching electrical stimulation of square wave to organic substance at Kyoto Prefectural University of Medicine (Crenshaw, 1977). In 1953, Yasuda et al discovered that bone in compression was electronegative, and bone in tension was electropositive (Glazer Glazer, 2001). From 1962 to 1964, the scientists Friedenberg and Brighton furthered Yasudas research and discovered that bone that is growing or repairing itself shows and electronegative potential, while bone that is not has an electropositive potential. This discovery has encouraged others to research electrical stimuli in relation bone regeneration (Glazer Glazer, 2001). In 1975, Dr. McElhannon published a report stating the technology used to treat fractures in humans with electrical stimulation is not yet advanced enough to promote bone regeneration, but shows promise in animals (Meadows, 2008). Two years later, Dr. Paterson et al performed an experimental model on delayed union fractures of the tibia in adult dogs. The model showed an accelerated healing time where Osteogenesis was normal, and no other abnormalities were found (Meadows, 2008). In 1978, the FDA approved the use of external bone growth stimulators (Haverbush, 2005). In 1983, Dr. Hanaoka performed a study observing the effects of pulsed micro-electrical currents on internal remodeling in long tubular bone and bone healing (Meadows, 2008). A group of 14 dogs had electrodes inserted into the femora with pulsed micro-electrical currents applied to the right femora for four weeks. The dogs were split into groups and each group had different electrical currents (Hz) applied. The results s howed that bone healing in all cases was promoted (Meadows, 2008). Dr. Ahl et al, in 1984, used a semi invasive technique for bone healing on 23 patients with nonunion. Ten of those had solid bone regeneration, and the other 13 did not fully unite these were later determined to have been breaks that were too far apart (Meadows, 2008). In 1985, Dr. Kondo performed a study on the femur of dogs. The bones in the experimental group observed proliferation of osteoblasts on the third day, which transitioned into bone remodeling and a shortened healing time by the end of the third week (Meadows, 2008). In 1995, Dr. Zamora-Navas et al performed a study on 22 patients with nonunion, with a gap of 0.5 or more, using capacitively-coupled electrical signal for a treatment time of about 26 weeks. In the end, over 70% of the 22 had solid bone union if the gap was 1 cm or smaller (Meadows, 2008). In 1996, the FDA approved the use of Electrical Bone Growth Stimulators, both invasive and noninvasiv e. Patent History On May 31, 1977, Dr. Levys bone generating device was approved. The stimulator produced electrical pulses applied to the bone, as opposed to direct current potential, to make the bone grow faster and stronger (Levy, 1977). The device is invasive, and is made of materials that will not poison or react with the surrounding tissue or bone (Levy, 1977). On November 15, 1983, Hirshorn et al had their patent approved on their implantable bone growth stimulator that uses a direct current output, and constantly transmits pulsed electromagnetic energy to the injury site. The output of energy(rate) is directly proportional to the set current. To make sure that the device is not affected by the pulsing of the transmission, a coil was placed inside the device to deliver a constant current. The device is enclosed in a titanium case, and has a longer shelf life due to an electrical switch that was placed inside the device (Hirshorn, Swift, Evans, 1983). On My 19, 1987, Dr. Campbells patent was approved. His stimulator was circuit adapted, and relied on the tissue (bone) to act as the load to make the circuit work. The storage device controlled the oscillator circuit, which in turn controlled the charge of the current that was issued from the battery and applied directly to the bone at the fracture site (Campbell, 1987). On May 9, 1995, Kronbergs stimulator was approved. This device was a non-invasive device that used low alternating currents applied to the patients skin. This particular device is battery powered and was found to generate the electrical characteristics found in bones naturally that generate normal bone growth (Kronberg, 1995). On June 16, 1998, Dr. Ericksons electric bone stimulator was approved. His stimulator came with a hand-held device which transmitted, and received, signals to the implanted stimulator (Erickson, Tepper, Thacker, Varrichio, Pilla, 1995). On August 2, 2007, Dr. Nyezs invasive stimulator was approved. The device is controlled by an external remote that sends a wireless signal to the stimulator. The current is circuitry controlled. It was made to be coupled with a hip prosthesis to help with healing and proper function, but can be used to stimulate healthy bone growth in areas of injury (Nyez, 2007). Device Theory In 1953, surgeon Iwao Yasuda first demonstrated that callus could be created by applying electric fields to bone (Figure 8). His experiment consisted of wrapping wire around a rabbitt femur and sending a small (1 uA) current to the anode, away from the bone. After three weeks of continuous current, Yasuda observed that a callus-typically generated during fracture repair- was beginning to form in the direction of the current (Liboff, 2006). There are three types of electric bone growth stimulators. They are categorized based on invasiveness and type of current. Table 1 gives a brief description of the different devices. Note that there are only two types listed, invasive and noninvasive (Liboff, 2006). Semi-Invasive Treatment Semi-invasive systems are semi-implantable: partially internal and partially external. The device provides a constant direct current supplied by an external power supply. The electrodes, on the other hand, are percutaneous and pass through the skin (Electrical Bone Growth Stimulators). These systems, however, are not currently in production, and consequently are not refered to by other scholars and have no relevant data (Clinical Policy Bulletin: Bone Growth Stimulators, 2010). Invasive Treatment The invasive treatment option, also known as direct current (DC) stimulation, is fully implanted and utilizes constant direct current. The device requires two surgies: one to implant the device, and one to remove the device. The anode is placed in the soft tissue, and the cathodes are connected to a power supply (typically a lithium battery) [cain] and placed at the fusion site. At the fracture site, the electrodes can be arranged in two ways (Figure 9). They can be placed on each side of the fracture as to bridge the defect; or, the electrode can be placed directly in the defect (Liboff, 2006). The although the current setting depends upon the fracture, it is typically set at 20 uA for up to six months (Lyle E. Cain, 2002). Noninvasive Treatments There are both electric and electromagnetic noninvasive EBGS devices. They are completely external and do not require surgery. Electric Option The electric noninvasive EBGS device works through capacitive coupling (CC). The CC device uses a 60 kHz alternating sinusoidal signal to produce a current. Two electrodes are placed on the skin, one on each side of the fracture (Figure 10) (Gan, Fredericks, Glazer, 2004). The power supply (typically a 9-V battery) is worn on the hip, and operated twenty four hours a day. Treatment generally applies 5-10 mA at the skin, and 15-20 uA at the fracture site. Device maintainence relies on the patient and includes changing the battery daily. Electromagnetic Options Pulsed Magnetic Field The pulsed magnetic field device (PMF or PEMF) follows Faradays law that Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be induced in the coil (Faradays Law). It applies a sawtooth (nonsinusoidal) voltage to two parallel external coils, one above the fusion site, and one below (see figure #). The applied voltage creates a current through the coils that generates a single, magnetic field through the defect. Because the field is constantly changing, an induced voltage is created, which appears as pulses (Liboff, 2006). The coils can be worn on the skin, or over a cast (if applicable) (Lyle E. Cain, 2002). The device includes an external battery pack and may be operated up to ten hours a day (Lyle E. Cain, 2002), but treatment is typically only three hours daily (Liboff, 2006). Ion Cyclotron Resonance The ion cyclotron resonance (ICR) device is similar to the PFM device in that it also uses an external coil system. ICR devices, however, apply a different theory than PMF devices. It was shown in 1985 that the results embodied in the so-called calcium efflux effect were in close agreement with the predictions based on the resonance characteristics of certain biological ions subject to the Lorentz force (Liboff, 2006). The device combines both dc and ac magnetic fields to achieve resonant condition. The theory is that ions in resonance are more likely to stimulate the gating mechanism for ion channel transport, and tuning to these ions can increase growth (Liboff, 2006). The device (Figure 11) also uses an external battery pack, and the unit should only be operated thirty minutes per day (Lyle E. Cain, 2002). Regulatory Standards The FDA recognizes the noninvasive bone growth stimulator and the invasive bone growth stimulator under the Title 21-Food and Drugs, of the Code of Federal Regulations (CFR) (Product Classification, 2010). Both are Class III devices, so they must abide by general controls and receive premarket approval. Class III devices support or sustain human life, that are of substantial importance in preventing impairment of human health, or that present a potential, unreasonable risk of illness or injury. Premarket approval (PMA) is the FDA process of scientific and regulatory review to evaluate the safety and effectiveness of Class III medical devices. A PMA application must be submitted and reviewed before marketing the products because they are considered high-risk medical devices (Device Classification, 2010). Device Review Advantages Previous treatments for nonunions included rigid fixation, bone grafts, and amputation. The electric bone growth stimulator has several advantages over these more tradition treatments. The treatment is less severe than bone grafting and the hospital stay after the invasive treatment is typically only three to four days, as opposed to ten days of recovery after grafts. Also, the average completion time for a successful union is only four months, compared to six to eight for bone grafts (Anbuselvan, Krishnamurthy, Madhumathi, Manonmani, Aravindan, Babu, 1995). Moreover, the EBGS is less traumatic than amputation and allows for the retention of limbs. In regards to the devices, the invasive option is advantageous because it provides constant uniform current and does not require an active patient role. After surgery, the device is self operated and maintained. Also, the invasive option bypasses tissue resulting in less resistance and better treatment results. The CC device is small, light, and easy to use (Lyle E. Cain, 2002). Disadvantages The main disadvantage of the EBGS is that union may be unsuccessful if the fracture gap is too large, typically over one centimeter. Also, before an EBGS is used, it must be determined that the bone is not healing properly on its own. Lastly, these devices have not yet been proven successful for treatment of nonunions in locations other than long bones or spine (Clinical Policy Bulletin: Bone Growth Stimulators, 2010). In regards to the devices, the invasive option has a higher hospital cost and patient morbidity due to the surgeries necessary for device implantation and removal. The CC device requires patient compliance. The patient must monitor, operate, and maintain the device, which includes changing the battery daily. Also, there may be skin irritation from the electrodes. Also, the PEMF and ICR devices are often larger and heavy than other external devices, which may create difficulties for patients (Clinical Policy Bulletin: Bone Growth Stimulators, 2010). Product Comparison Biomet is the only company that produces invasive electric bone growth stimulators. Their products include the OsteoGen Bone Growth Stimulator, the OsteoGen Dual Lead Bone Growth Stimulator for use with bone graft surgery, and the OsteoGen-M Bone Growth Stimulator, which utilizes a mesh cathode. Biomet also produces the following external, noninvasive EBGS devices: EBI Bone Healing System and the OrthoPak 2 Bone Growth Stimulator. The EBI Bone Healing System is more convenient because the actual device is worn like a sports band or brace that wraps around the limb, where as the OrthoPak 2 is a larger device with dermal electrodes that must be carried along with the battery pack. On the plus side, the OrthoPak 2 allows for easier placement of hard-to-reach fracture sites (Biomet, 2010). DJO sells the CMF OL1000 Bone Growth Stimulator. It follows a similar concept as the EBI Bone Healing System, except this device is not fully closed, giving it the ability of being worn over a cast if necessary (Products, 2009). Literature Review We assigned the designated sections of the report to each team member to research individually. We attended a research session with librarian Christine Drew to better understand WPIs academic databases and resources. Key terms used in our research included the following: electric bone growth stimulator, bone growth stimulator, bone growth devices, fracture healing, delayed union fracture, non union fracture, Faradays Law, Wolffs Law, piezoelectricity, bone repair, bone cells, electric bone growth device regulations, cost of bone growth stimulation, FDA class III devices, premarket approval, bone growth device history, Luigi Galvani, electric bone growth studies, companies that sell electric bone growth stimulators, Biomet, Exogen, modern electric growth theory, and bone growth stimulator patent. We searched several databases and reliable search engines including the following: Google Books, Google Scholar, Gale PowerSearch, EBSCOhost, ScienceDirect, PubMed, and Wiley Interscience.

Informed Consent Essay -- Medical Care

Informed consent is the basis for all legal and moral aspects of a patient’s autonomy. Implied consent is when you and your physician interact in which the consent is assumed, such as in a physical exam by your doctor. Written consent is a more extensive form in which it mostly applies when there is testing or experiments involved over a period of time. The long process is making sure the patient properly understands the risk and benefits that could possible happen during and after the treatment. As a physician, he must respect the patient’s autonomy. For a patient to be an autonomous agent, he must have legitimate moral values. The patient has all the rights to his medical health and conditions that arise. When considering informed consent, the patient must be aware and should be able to give a voluntary consent for the treatment and testing without being coerced, even if coercion is very little. Being coerced into giving consent is not voluntary because other s people’s opinions account for part of his decision. Prisoners and the poor population are two areas where coercion is found the most when giving consent. Terminally ill patients also give consent in hope of recovering from their illness. Although the possibilities are slim of having a successful recovery, they proceed with the research with the expectation of having a positive outcome. Although the physician provides adequate information to his patient, how can he ensure that his patient properly knows everything and is capable of making the decision? Prisoners and the poor population are simply two groups that are easily coerced into giving consent to medical research. Although prisoners give consent, I don’t believe many are voluntarily giving consent, but... ...on from your patient that could possible alter his decision. The patient should have rights to know all information and statistics about the doctor and the success rate of all treatment options revealed. The information, in which, the doctor reveals or does not reveal fall under the category of reasonable clinician standard. Reasonable clinician standard is inconsistent with informed consent because the focus is on the physician rather than the patient’s best interest. Works Cited Davis, John K. "Precedent Autonomy and Subsequent Consent." Ethical Theory and Moral Practice 40.3 (2004): 267-91. Gert, Heather. "Avoiding Surprises: A Model for Informing Patients." The Hastings Center Reports 32.5 (2002): 23-32. Nelson, Robert, and Jon Merz. "Voluntariness of Consent for Research: An Empirical and Conceptual Review." Medical Care 40.9 (2002): 69-80.

Factors Affecting Reaction Rate Essay

Introduction: In reference to the collision theory, molecules act as small spheres that collide and bounce off each other, transferring energy among themselves when the collide. In order for a reaction to occur, there must be collisions between molecules. Through experimentation, factors are discovered that influence the reaction rates of chemical reactions include the concentration of reactants, temperature, surface area, the physical state of reactants, and a catalyst. This experiment regarding the factors that affect reaction rate tests the effects of increased concentration and temperature of the hydrochloric acid solution (HCl) and also the effect of increased surface area of magnesium metal (Mg). When glow sticks are immersed in a hot water bath, it is proven that they glow with greater intensity. This proves that an increased temperature has an effect on the reaction itself, allowing molecules that make up the liquid inside the glow stick to move with greater speed, resulting in more collis ions. The balanced equation for this reaction would be: Mg (s) + 2 HCl (aq) = MgCl2 (aq) + H2 (g) Purpose: The objective of this laboratory experiment is to observe and record the effect of reactant concentration, reactant surface area and reactant temperature on the overall rate of reaction. Hypothesis: During this experiment, acids of different concentration are utilized, and the different reaction rates calculated. When the reactant’s concentration increases, there are more atoms per space for a collision to occur. A prediction for the effect of concentration on reaction rate would be that the higher the concentration of the reaction, the faster the reaction time. As the temperature of the reaction rate increases, the molecules will move faster, also resulting in more collisions and perhaps a faster reaction rate. Lastly, in a reaction, increasing the surface area of the solid reactant increases the number of collisions per second. The more collisions there are, the more energy is produced, and also could contribute to a  faster rate of reaction. Procedure(s): Please refer to Heath Chemistry Laboratory Experiment 18 A pg. 192-196 In Part III: Effect of Temperature on Reaction Rate, only three beakers were utilized in the experiment, Beaker A containing hot water, Beaker B containing water at room temperature, and Beaker C containing iced water. The fourth beaker was not utilized due to the limited time allotted for this experiment. In this experiment, a stopwatch was not used to record time. Instead, an Apple iPhone was used to calculating the time it took for the reactions to occur completely. The device was capable of calculating time to the hundredth decimal point and an uncertainty of  ±0.01 was provided. Safety Notes: Hydrochloric acid is highly corrosive to skin, eyes and clothing. When handling it, make sure to wear safety goggles, lab aprons, plastic gloves and use a full-face shield. Wash and spills or splashes immediately with plenty of water and inform the supervising teacher. Reagent Disposal- Return any unused magnesium metal to the designated container. Any hydrochloric solutions left in the test tubes should be returned to another designated container for neutralization before being discarded down the sink. Data and Observations: Quantitative Observations- Part I- Effect of Concentration on Reaction Rate Mass of 11 cm strip of Mg: 0.18 g  ± 0.01 Average mass of 1 cm strip of Mg: 0.18 g / 11 strips = 0.0163  ± 0.0001 *two significant figures (0.016) Concentration of Acid Reaction Time (in seconds)  ±0.01 Reaction Rate (g Mg/s) 0.50 M 650.66 0.000025 1.0 M 128.50 0.00013 3.0 M 33.95 0.00048 6.0 M 13.26 0.0012 Part II- Effect of Surface Area on Reaction Rate Shape of Magnesium Strip Reaction Time (in seconds)  ±0.01 Reaction Rate (g Mg/s) Test Tube A- slivers of Mg 110.40 0.00015 Test Tube B- rolled up strip of Mg 134.55 0.00012 Test Tube C- flat piece of Mg 128.05 0.00013 Part III- Effect of Temperature on Reaction Rate Temperature in  °C  ±1 Reaction Time (in seconds)  ±0.01 Reaction Rate (g Mg/s) Beaker A- Heated Water Bath (57  °C) 73.35 0.00022 Beaker B- Room Temperature Water Bath (23  °C) 128.05 0.00013 Beaker C- Chilled Ice Water Bath (5 °C) 392.50 0.000042 Qualitative Observations-  Before immersion in hydrochloric acid, the magnesium strips were a dull grey colour, coated in a sort of white substance. Sandpaper was used to remove impurities from the magnesium strips, resulting in a grey strip, with a bit of metallic lustre. The strip of magnesium received was extremely malleable and was easily cut into 1 cm strips and folded into a tiny ball. During the immersion of the magnesium metal in the hydrochloric acid solution, white bubbles could be seen escaping the surface of the metal as gas was produced during the reaction. Depending on the temperature of the hydrochloric acid and the overall molar concentration, the rate of reaction differed but the same signs were shown. During the reaction between the magnesium metal and higher concentrations of hydrochloric acid, it was observed that the test tube grew quite warm to the touch. As the immersed magnesium strip sank down, it appeared coated in a layer of white bubbles that fizzed like a carbonated drink. In the lower concentrations of hydrochloric acid, the strip spent some time floating at the surface of the solution in the test tube, later sinking down to the bottom as the bubbles died down. According to the balanced equation, the white bubbles that rose to the surface are hydrogen gas (H2 (g)) bubbles produced as one of the products in the reaction. During the reaction, as the magnesium reacted with the hydrochloric acid solution, there was a strong metallic scent that came from the open system, especially in when the magnesium strip was dissolved in the strongest concentration of hydrochloric acid. After the reaction, no trace of the magnesium metal remained in the test tube. The test tube was filled with a completely clear aqueous solution. Questions and Calculations: 1.See attached graph #1: Reaction Rate vs. Concentration of HCl (aq) and graph #2: Reaction Rate vs. Temperature Data. 2. a) Please refer to Reaction Rate vs. Concentration of HCl (aq). As the concentration increases, the rate of reaction increases as well, due to the higher number of molecules colliding with each other. b) As the surface area of the surface area increases, the reaction rate also speeds up. This happens because there is a greater surface area available for reaction. c) Please refer to Reaction Rate vs. Temperature Data. As the temperature increases, the rate of reaction increases. This is due to the increased kinetic energy, allowing the molecules to collide more often and with more energy. 3. Please refer to Reaction Rate vs. Concentration of HCl (aq). As shown on the graph, as the concentration doubles, the reaction rate also doubles approximately (due to sources of error). Although this seems to be the case in this experiment, it doesn’t necessarily mean th at this statement is true for all reactions. The orders of reactions and equations that calculate the rate have to also be taken into consideration. 4. In Part II, the small slivers of magnesium produced the fastest reaction. This is due to in increase in surface area, by cutting the one-centimeter strip into tiny slivers, allowed more surface area to be exposed to the hydrochloric acids, allowing for a quicker reaction rate. 5. Please refer to Reaction Rate vs. Temperature Data. When the test tube containing the hydrochloric acid solution was immersed in the ice water bath, it produced the slowest reaction rate and time. This is a result of the slowing of molecules due to decrease in temperature. As the kinetic energy and movement of the molecules decrease, the reaction rate also decreases due to the reduced number of collisions between molecules. 6. a) Please refer to Reaction Rate vs. Concentration of HCl (aq). For a 1 cm strip of magnesium metal to react with 4.0 M hydrochloric acid, the reaction time would be 21 seconds, calculated to two significant figures. b) Please refer to Reaction Rate vs. Temperature Data. For a 1 cm strip of magnesium metal to react with 1.0 M hydrochloric acid at 15  °C, the reaction time would be 190 seconds, calculated to two significant figures. 7. Please refer to Reaction Rate vs. Temperature. Doubling the temperature does increase the reaction rate, due to faster moving particles, but it doesn’t necessarily double the reaction rate. The increase in kinetic energy  provides many more collisions between molecules, but the energy coming from the molecular collisions does not exactly double. Follow-Up Questions: 1. It is possible to vary the factors of concentration, surface area and temperature in a way to prevent a reaction from happening. As the concentration of a solution decreases in molarity, there are fewer atoms per space for the collision to occur. By lowering the temperature drastically, it slows down the movement of particles so that the collisions are few in number and release less energy when molecules bump against each other. It is the same with surface area, as the density becomes greater and the sides exposed to the chemical reaction decrease, it lowers to rate of reaction significantly. In order to prevent a reaction from happening at all, the temperature should be extremely cold, the concentration as low as possible and the density of the reactant (ex. magnesium metal) as dense as possible, perhaps a large brick. This is only a hypothesis though, and as studied in reaction kinetics, every reaction requires a minimum amount of energy in order to react. By not achieving that bare minimum of activation energy required, a reaction will not occur. 2. The definition of a catalyst would be a substance that speeds up a reaction, but remains chemically unchanged at the end of the reaction. After adding a catalyst to the reaction between the solid magnesium metal and aqueous solution of hydrochloric acid, the reaction rate would increase, due to the provision of an alternative route for the reaction with lower activation energy. This does not lower the overall activation energy, but simply provides a different route for the reaction to happen where the molecules collide more often. 3. Kindling wood has more surface area and has a lower density, making it easier for the fire to burn due to the increased area of exposure to oxygen (O2). The mass of kindling is also lower than a log, allowing it to heat up quickly to the temperature needed for a combustion reaction to occur. A log is very dense and has a larger mass, therefore taking a longer time to heat it up to the point where a combustion reaction would occur. 4. When a person blows on a smoldering fire, the level of oxygen is increased. Oxygen is a key component in a combustion reaction, is it needed as a fuel in order for the reaction to occur. This will increase the temperature, which speeds up the kinetic energy of the molecules molecules, allowing for more collision energy and a  faster rate of reaction. Conclusion and Error Analysis: In conclusion, it was discovered that an increase in concentration, surface area and temperature all contributed to a faster rate of reaction, developing a conclusion that all of these are factors that affect the rate of reaction. As predicted in the hypothesis, the application of the collision theory was a key factor in the increasing the reaction rate as the concentration of HCl (0.50-6.0 M HCl), surface area of Mg (slivers, rolled, and flat) and temperature of HCl (5  °C- 57  °C) was increased. The highest concentration of HCl (6.0 M) produced the faster reaction rate of 0.0012 g Mg/s. When the magnesium metal was cut into tiny slivers, this also produced a faster reaction rate of 0.0015 g Mg/s. As hydrochloric acid solution was warmed in a hot water bath to a temperature of 57  °C, it produced a reaction rate of 0.00022 g Mg/s. This experiment was not perfect, and there were many sources of error during the process of completing this laboratory experiment. The magnesium metal utilized was coated in a dull, white coating, due to the exposure of magnesium to the oxygen in the environment, producing magnesium oxide (MgO). Sandpaper was utilized to try and remove most of the magnesium oxide coating, this also contributed to the sources of error because the sandpaper was not new and had contamination from the substances it had been used on before. Test tubes were used in the experiment, but through careful observation, some of the test tubes had not been properly cleaned, and contained minimal residue inside from previous experiments, perhaps contaminating the hydrochloric acid solution. As the magnesium metal was cut into slivers, particles of the magnesium might have been stuck to the blades of the scissors or the napkin the slivers were put on, lowering the mass and creating another error for the experiment. There was confusion during the solution preparation stage about the labelling on the jars of hydrochloric acid solution, and a new solution had to be prepared by the supervising teacher. An Apple iPhone was used to collect the reaction time, and the measurement recording was restricted due to the number of decimal places the iPhone could time to, and uncertainties had to be provided alongside the measurement data collected. There was also a source of error for the time the magnesium metal was dropped into the acid solution, as starting the time as soon as the magnesium entered the acid was  very difficult. References: Hebden Chemistry 12: Workbook for Students, Unit 1: Reaction Kinetics, pg. 1-36 Heath Chemistry Laboratory Experiments, Experiment 18 A: Factors Affecting Reaction Rate, pages. 192-196 Factors Affecting Reaction Rates http://chemwiki.ucdavis.edu/Physical_Chemistry/Kinetics/Factors_That_Affect_Reaction_Rates This website was used on October 3, 2014 to help develop a better understanding of collision theory in order to explain the various factors affecting the rate of reaction.

Free Essays on What Do You Say After You Say Hello

â€Å"What do you say after you say hello†, by Eric Berne,M.D. What do you say after you say hello? This question is asked all over the world by different people and the reason it can’t be answered is the basic psychological garbage we all have inside our heads. Our mothers, fathers, grandmothers, grandfathers, and anyone else who has a predetermine thought about how people should live their lives. Berne says that people have an illusion on how we react to each other. Such as if you meet a person and we talk to them as what we call â€Å"normal† voice and looking them straight in the eyes and then find out he/she is dying we get up set because we feel that we did not give them the respect that was need like in a low voice with our heads down and not looking them in the eyes. We forget that they are living now in the present and not in the past or in their heads. We have a predetermined attitude towards that person. Berne’s theory is that we have had to learn these notions about people from our family and the ancestral attitu des. Berne also writes about the different types of scripts that people have such as; the winners, losers, non winners, sex scripts, and the clock time and goal time. The most typical scripts that most people are; little pink riding hood or the waif, Sisyphus or they you go again, little miss miffit or you cant scare me, old soldiers never die or who needs me, the dragon slayer or daddy knows best, Sigmund or if you cant do it one way try another, Florence or see it through, and tragic. Dr Berne’s conclusion was that the harder the script that the person has is the easies to talk to a stranger. Oedipus, who got away with the one liners to women and men as well as the robber who says shut- up. Though most people go through six different situations to talk to someone and they are; 1st a structured setting, 2nd a social setting, 3rd an unstructured setting, 4th where one word is needed to talk to someone like at a... Free Essays on What Do You Say After You Say Hello Free Essays on What Do You Say After You Say Hello â€Å"What do you say after you say hello†, by Eric Berne,M.D. What do you say after you say hello? This question is asked all over the world by different people and the reason it can’t be answered is the basic psychological garbage we all have inside our heads. Our mothers, fathers, grandmothers, grandfathers, and anyone else who has a predetermine thought about how people should live their lives. Berne says that people have an illusion on how we react to each other. Such as if you meet a person and we talk to them as what we call â€Å"normal† voice and looking them straight in the eyes and then find out he/she is dying we get up set because we feel that we did not give them the respect that was need like in a low voice with our heads down and not looking them in the eyes. We forget that they are living now in the present and not in the past or in their heads. We have a predetermined attitude towards that person. Berne’s theory is that we have had to learn these notions about people from our family and the ancestral attitu des. Berne also writes about the different types of scripts that people have such as; the winners, losers, non winners, sex scripts, and the clock time and goal time. The most typical scripts that most people are; little pink riding hood or the waif, Sisyphus or they you go again, little miss miffit or you cant scare me, old soldiers never die or who needs me, the dragon slayer or daddy knows best, Sigmund or if you cant do it one way try another, Florence or see it through, and tragic. Dr Berne’s conclusion was that the harder the script that the person has is the easies to talk to a stranger. Oedipus, who got away with the one liners to women and men as well as the robber who says shut- up. Though most people go through six different situations to talk to someone and they are; 1st a structured setting, 2nd a social setting, 3rd an unstructured setting, 4th where one word is needed to talk to someone like at a...

A Profile of Barry Goldwater - “Mr. Conservative”

A Profile of Barry Goldwater - â€Å"Mr. Conservative† Barry Goldwater was a 5-term US Senator from Arizona and the Republican nominee for president in 1964. Mr. Conservative Barry Goldwater and the Genesis of the Conservative Movement In the 1950s, Barry Morris Goldwater emerged as the nation’s leading conservative politician. It was Goldwater, along with his growing legion of â€Å"Goldwater Conservatives,† who brought the concepts of small government, free enterprise, and a strong national defense into the national public debate. These were the original planks of the conservative movement and remain the heart of the movement today. Beginnings Goldwater entered politics in 1949, when he won a seat as a Phoenix city councilman. Three years later, in 1952, he became a US Senator for Arizona. For nearly a decade, he helped redefine the Republican Party, assembling it into the party of the conservatives. In the late 1950s, Goldwater became closely associated with the anti-Communist movement and was an avid supporter of Sen. Joseph McCarthy. Goldwater stuck with McCarthy until the bitter end and was one of only 22 members of Congress who refused to censure him. Goldwater supported desegregation and civil rights to varying degrees. He got himself into political hot water, however, with his opposition to legislation that would eventually turn into the 1964 Civil Rights Act. Goldwater was a passionate Constitutionalist, who had supported the NAACP and had backed previous versions of civil rights legislation, but he opposed the 1964 bill because he believed it violated states’ rights to self-govern. His opposition earned him political support from conservative southern Democrats, but he was detested as a â€Å"racist† by many blacks and minorities. Presidential Aspirations Goldwater’s rising popularity in the South in the early 1960s helped him win a tough bid for the Republican presidential nomination in 1964. Goldwater had been looking forward to running an issue-oriented campaign against his friend and political rival, President John F. Kennedy. An avid pilot, Goldwater had planned to fly around the country with Kennedy, in what the two men believed would be a revival of the old whistle-stop campaign debates. Kennedys Death Goldwater was devastated when those plans were cut short by Kennedy’s death in late 1963, and he mourned the president’s passing profoundly. Nevertheless, he won the Republican nomination in 1964, setting up a showdown with Kennedy’s vice president, Lyndon B. Johnson, who he despised and would later accuse of â€Å"using every dirty trick in the book.† Introducing ... Mr. Conservative During the Republican National Convention in 1964, Goldwater gave perhaps the most conservative acceptance speech ever uttered when he said, â€Å"I would remind you that extremism in the defense of liberty is no vice. And let me remind you also that moderation in the pursuit of justice is no virtue.† This statement prompted one member of the press to exclaim, â€Å"My God, Goldwater is running as Goldwater!† The Campaign Goldwater was not prepared for the brutal campaign tactics of the vice president. Johnson’s philosophy was to run as though he were 20 points behind, and he did just that, crucifying the Arizona Senator in a series of vicious television ads. Comments Goldwater made during the previous ten years were taken out of context and used against him. For example, he had once told members of the press that he sometimes thought the country would be better off if the entire Eastern Seaboard were sawed off and floated out to sea. The Johnson campaign ran an ad showing a wooden model of the United States in a tub of water with a saw hacking off the Eastern states. The Effectiveness of Negative Campaigning Perhaps the most damning and personally offensive ad to Goldwater was the one called â€Å"Daisy,† which showed a young girl counting flower petals as a male voice counted down from ten to one. At the end of the ad, the girl’s face was frozen as images of nuclear war played in the shadows and a voice extolled Goldwater, implying he would launch a nuclear attack if elected. Many consider these ads to be the beginnings of the modern negative campaign period which continues to this day. Goldwater lost in a landslide, and Republicans lost many seats in Congress, setting the conservative movement back significantly. Goldwater won his seat in the Senate again in 1968 and continued to earn respect from his political peers on Capitol Hill. Nixon In 1973, Goldwater had a significant hand in the resignation of President Richard M. Nixon. The day before Nixon resigned, Goldwater told the president that if he stayed in office, Goldwater’s vote would be in favor of impeachment. The conversation coined the term â€Å"Goldwater moment,† which is still used today to describe the moment a group of the president’s fellow party members vote against him or publicly take a position opposite him. Reagan In 1980, Ronald Reagan won a crushing defeat over incumbent Jimmy Carter and columnist George Will called it a victory for conservatives, saying Goldwater had actually won the 1964 election, â€Å"†¦ it just took 16 years to count the votes.† The New Liberal The election would eventually mark the decline of Goldwater’s conservative influence as the social conservatives and the Religious Right began to slowly take over the movement. Goldwater vociferously opposed their two top issues, abortion and gay rights. His views came to be regarded as more â€Å"Libertarian† than conservative, and Goldwater later admitted with wonder that he and his ilk were the â€Å"new liberals of the Republican party.† Goldwater died in 1998 at the age of 89.

Financial Management in Nonprofit Organizations Essay - 4

Financial Management in Nonprofit Organizations - Essay Example wn that different objective of for-profit and nonprofit organizations are the major factor which requires the change in financial management processes. It has also found that financial management techniques may vary across for-profit and nonprofit organizations because of different governance mechanisms, tax treatment, stakeholders and accounting requirements. Therefore, for the financial health of nonprofit organizations and to facilitate them in achieving their aims, such changes have become necessary. A nonprofit organization offers public services without any intention of achieving any personal gain or self interest and these organizations are exempt from paying federal taxes (Zietlow, Hankin, & Seidner, 2007). Under the selection 501(c) (3) of the Code, the described organizations are charitable organizations and they are eligible to get tax-deductible contributions and earnings of organization may not inure to private shareholders or individuals (Credit Infocentre, 2006). Actually the number of nonprofit organizations is increasing vary rapidly and it is becoming important to control and monitor the financial practices of these organizations. Although these organizations can earn money however, the money earned has to be used for public service purpose only. Therefore, the differences in financial management techniques appear right from the difference in financial objectives of the two kinds of organizations. The primary financial objectives of nonprofit organizations found th rough a survey in 2002 highlight that most nonprofit organizations aims to achieve breakeven point, followed by those which aim to maintain a significant level of cash reserves and financial flexibility. Moreover, the other primary objectives identified include maximizing cash flow, net revenues, net donations and surplus and reducing costs (Zietlow, Hankin, & Seidner, 2007). Because of these financial objectives the financial management techniques of not-for-profit and for-profit

Electoral Reforms in Canadian Provinces Essay Example | Topics and Well Written Essays - 2000 words

Electoral Reforms in Canadian Provinces - Essay Example This is due to the use of First-Past-The-Post (FPTP) method of electing candidates. However, the Canadian society has undergone many changes since the FPTP method was introduced and even British itself has ever since changed its electoral system. Canadian society is now more diverse and mobile and as such, this electoral system is proving ineffective in dealing with issues that affect society today. In other words, the system no longer responds to twenty-first-century democratic values as political, cultural and economic reality has greatly changed (Law Commission of Canada 2004, p. 2). There is thus considerable pressure from citizen groups, academics, politicians and political parties to institute electoral reforms. In fact, provinces like British Columbia (BC), New Brunswick, Ontario, Prince Edward Island and Quebec have gone as far as starting the process of electoral reforms. It is believed that adding an element of proportionality to the existing system may go a long way in sol ving many of the problems inherent in the current system. The question that needs to be answered is; will alternative methods succeed where FPTP has failed? This will be the focus of this essay. To answer this question, the essay will first discuss the shortfalls of the current electoral system. It will then examine the various proposals put forward for reforms such as the Alternative Vote (AV), Two-round or run-off system, list-Proportional Representation, Single Transferable Vote (STV), Mixed Member Proportion (MMP), and Mixed Member Majoritarian (MMM) systems. Their weaknesses and strengths will be evaluated to determine if they can be compatible with the Canadian democratic values and constitution. Various proposals in different provinces will also be examined to determine why they have not succeeded and what can be done to make them more applicable in a Canadian context.