Alzheimer’s Disease Biological Causes

Alzheimers Disease Biological Causes Alzheimer’s disease is driven by two processes: extracellular deposits of beta amyloid and intracellular accumulation of tau protein.[9] â€Å"It is characterized by accumulation of amyloid-ÃŽ ² peptide, generated by proteolytic processing of the amyloid precursor protein (APP) by ÃŽ ²- and ÃŽ ³-secretase.†[10p554] The APP gene provides instructions for making APP. This protein is found in many tissues and organs including the brain and the spinal cord. It plays a role in cell growth, formation of new synapses, differentiation of neurons, cell adhesion, calcium metabolism, and protein trafficking.[10] The length of APP varies between 695 to 770 amino acids. Protein breakdown generates AÃŽ ², a 39- to 42-amino acid peptide. This form is the primary component of amyloid plaques found in the brains of AD.[10] APP may be processed via a non-amyloidogenic pathway that prevents AÃŽ ² formation or through a toxic, amyloidgenic pathway, resulting in AÃŽ ² plaque formation. In the non-amyloidogenic pathway, APP is processed in peripheral cells. In this pathway, APP is cleaved by an enzyme called ÃŽ ±-secretase followed by ÃŽ ³-secretase. These are integral membrane proteins where cleavage by ÃŽ ±-secretase occurs within the AÃŽ ² domain. Cleavage by ÃŽ ±-secretase prevents AÃŽ ² formation and releases the extracellular secreted APP ÃŽ ± fragment.[11] Research shows that secreted APP ÃŽ ± protects neurons, regulates stem cell production, plays a role in brain development, and promotes the formation of synapses and cell adhesion. The remaining C-terminal fragment of APP then undergoes either lysosome degradation or ÃŽ ³-secretase cleavage, which generates p3 and the APP intracellular domain.[11] In the amyloidogenic pathway, APP is primarily processed in neuronal cells. Within this pathway, APP is cleaved by ÃŽ ²-site APP cleaving enzyme 1 ( BACE1 ), followed by ÃŽ ³-secretase. BACE1 initiates the production of the toxic AÃŽ ² that plays a crucial role ea rly in the pathogenesis of AD.[11] Cleavage of APP by BACE1 releases the extracellular secreted APP ÃŽ ² fragment which is thought to assist with axon pruning and cell death.[12] BACE1 cuts APP to produce a membrane-bound C-terminal fragment C99 that is further processed by ÃŽ ³-secretase to generate AÃŽ ². The site of ÃŽ ³-secretase cleavage within the transmembrane domain of APP can vary and determines the type of AÃŽ ² that is produced, AÃŽ ² 39-42. Once produced, AÃŽ ² is usually secreted into the extracellular space via exocytosis.[12] AÃŽ ² is a major component of plaques that are found in both intracellular and extracellular locations. AÃŽ ² 42 is considered to be one of the main causes of these plaques because it clumps together more quickly than other isoforms, forming clusters and fibrils.[10] In individuals with AD, elevated concentrations of AÃŽ ² plaques can lead to many cellular dysfunctions. The presence of AÃŽ ² plaques alone is not enough to diagnose AD since ma ny people without cognitive decline have plaques. Tau is a protein in the microtubule-associated protein family. It has several physiological functions in healthy axons including microtubule assembly and stability, vesicle transport, neuronal outgrowth and neuronal polarity. This protein consists of 352 to 441 amino acids and presents in various isoforms in the brain.[10] In AD, tau protein is hyperphosphorylated, causing disruption in microtubule transport and loss of neuronal transmission. Tau phosphorylation is the addition of phosphate to a tau protein through regulation of tau kinases. In humans, the tau gene is positioned on chromosome 17. In a normal brain, there are two to three moles of phosphate per one mole of tau, indicating that this amount of phosphorylation is necessary for tau to perform its normal biological functions. When tau becomes hyperphosphorylated, the ratio of phosphate to tau increases three to four fold compared to normal phosphorylation levels. This incr eased amount of phosphate alters the function of tau, making it insoluble and lacking affinity for microtubules. This leads to the degradation of the microtubules and neuronal cell death.[10]

The Yes Men Fix the World (2009) movie Essay Example | Topics and Well Written Essays - 500 words

The Yes Men Fix the World (2009) movie - Essay Example Recently university had named its renovated baseball stadium after Alex Rodriguez as he had donated $3.9 million for upgrading the field. The university’s ethical considerations are being challenged. The star athletes like Alex Rodriguez, Ryan Braun, Gio Gonzalez and five other prominent people associated with university and its programs have recently come under investigation for use of banned drugs (Schmidt, 2013). Moreover, various newspaper report claim that they have also links with clinics like Biogenesis that helps them to get performance enhancing drugs. Jimmy Goins the conditioning coach of Miami is suspected of providing drugs to the players. The university has therefore become nexus for drug mafia and is presently under investigation by NCAA. Yes person would initiate a sustained campaign against the athlete program of University of Miami for providing performance enhancing drug to its players. They would do so by using 3 news write-ups about the new research initiative started by university in the area of performance enhancement of athletes. Appiah’s idea of culture mainly relies on empowering people and letting them be the master of their decisions (Appiah, 2006). He says that often the excruciating circumstances of the people become major planks for the developed world to exploit and force their own attitude and ideas in the name for preserving cultures and cultural identities. He believes that ethics, morality and cultural paradigms are critical aspects which become extraneous not because people actually want to but due to lack of resources which makes them opt for new tools of survival. The prank is closely linked to Appiah’s ideas as it indirectly targets the ethical lassitude of the modern academia and its changing priorities for competing in different areas of human interaction. Schmidt, Michael S. Drug Enquiry Focuses on Athletes’ Ties to Team at University of

The duty to accommodate the injured and the disabled employees Essay

The duty to accommodate the injured and the disabled employees - Essay Example Three steps processes used to determine if the employer has made conscientious efforts on accommodation of the less fortunate employee: first is to know if the employee can perform his or her existing job. If the employee cannot, then establish if he or she can perform his or her current job if modified, if still he or she cannot, then determine if he or she can perform any other job existing re-bundled or modified job (David Morton Rayside, 2007). Disability is something that hinders an individual in undertaking life important functions. It may mean mental, psychological, physical, or even habitual. Of all the most complicated, as many employers claim, is mental incapacitation especially when the employee has to get into contact with clients, and habitual disabilities like drug dependency and alcoholism. They tend to be tricky even more than other health complications (David Morton Rayside, 2007). The importance of Human Rights Legislation, as it relates to disability is to protect those who are perceive or actually materially impaired through illness. The said disabilities include physical conditions, congenital deformities, asthma, epilepsy, hypertension, speech impediments, alcoholism and drug dependency, obesity and AIDS or AIDS related complex and any other medical, psychological or physical condition. However the duty to accommodate does not imply a guaranteed job for unemployed disabled person. If a person cannot reaso nably perform the essential duties and requirements after employment, there will be no findings for discrimination (David Morton Rayside, 2007). Accommodation is now a deeply entrenched feature in Canadian labor law. It has been enthusiastically practiced since the start of this decade, but it is already spawning or accelerating three outstanding trends in the arbitration system that are changing the very face of labor adjudication in

Title IX: Leveling the Playing Field Essay -- gender equity in sports

How does one define the success of a high school and college? Is it through standardized test scores, graduates, and college applicants? Is it through winning games and playing beyond the school? Yes, in fact it’s all of these things. America is based on freedom and equality. America is created with â€Å"Liberty and Justice for All†. America is only now starting to treat women as the equals they are. Although Title IX has improved athletic opportunities for women, the ratio of women to men athletic funds is uneven because of the revenue main stream men’s sports bring to the schools. As colleges grew in people and pride, football became the new sensation. With the predominant â€Å"football schools† nationwide, female athletic programs weren’t given much thought. Football provides the schools funding through its massive packed stands. The revenue made funneled back into the football programs and left little funding for any other sport, male or female. In 1972, the nation finally decided to make a stand, and force schools to create and sponsor other athletic teams for females, besides cheerleading and square dancing. Title IX was enacted in 1972 by President Richard Nixon. It â€Å"requires† gender equity for boys and girls in every educational program that is federally funded. Many people do not even know that Title IX exists, or if they do, that it applies to more than sports. However it applies to sports, access to higher education, career education, education for pregnant and parenting students, employment, learning environment, math and science, sexual harassment, standardized testing and technology. It forced schools to even the playing field and implement women’s sporting teams. Before Title IX, it was nearly impossible to get a f... ...011. Davis, Paula M. "Imagine Fund Will Offer Race and Gender-based Scholarships in Response to 2006 Anti-affirmative Action Law." MLive. Michigan Live LLC, 20 Aug. 2008. Web. 06 Feb. 2011. Grant, Christine. "A Title IX Presentation." Bailiwick. The University of Iowa Libraries, 25 Sept. 1995. Web. 10 Feb. 2011. Lopiano, Donna. "Title IX Q & A - Women's Sports Foundation." Title IX. Women's Sports Foundation, 26 May 2005. Web. 10 Feb. 2011. Rhode, Deborah L., and Christopher J. Walker. "Gender Equity in College Athletics: Women Coaches as a Case Study." NCAA. National College Athletics Association, 26 Mar. 2008. Web. 6 Feb. 2011. Weistart, John. "Equal Opportunity? Title IX and Intercollegiate Sports." Wilson Web, Fall 1998. Web. 2 Feb. 2011. "Christine Grant | Sports Management Resources." Our Consultants. Sports Management Resources. Web. 10 Feb. 2011.

Make decisions or solve problems Essay

What are heuristics? How do they help us make decisions or solve problems? How do they hinder decision making and problem solving? What does the study of heuristics tell us about how our mind works? Elvira Gubayeva In psychology, the term â€Å"heuristics† is used to describe cognitive shortcuts that our mind takes in order to save time and effort while solving problems and making decisions. Although this rule of thumb technique does not guarantee the solution, it is highly likely to solve the problem. These congnitive shortcuts differ from algorithms as algorithms will definitely solve the problem, although they would consume more time in the process. Thus, heuristics are shortcuts that eliminate the need to consider unlikely possibilities or irrelevant states to reach the final solution. From that perspective, heuristics are useful in making decisions or solving problems. One of the most important heuristic methods was explored by Newell & Simon. They called this method the means-ends analysis. This method implies that the problem solver will note the difference between the current state of the problem and the goal state, the solution. He would then create a subgoal to reduce the difference between the two states. A path, or an operator, would be selected to reach the subgoal. Egan & Greeno(1974) used the Tower of Hanoi problem to investigate this heuristic method. They found that subjects with prior experience with the problem who used the means-ends analysis solved more difficult versions of the problem faster than subjects who did not make appropriate subgoals. Subjects who changed their strategy to means-ends analysis produced better results than those who did not. Overall heuristics are useful in solving problems and making decisions as they reduce the complexity of different solutions that are possible. They do yield good results when they are used in the appropriate context. However, heuristics can also hinder decision making and problem solving. For example, Anzai & Simon(1979) found that many subjects used domain dependent strategies while solving the tower of Hanoi problem. This hindered their process to the solution as they avoided certain states in the puzzle that they believed would not help them, rather than move towards a definite goal/ subgoal state. Subjects were more interested in the goal state and focused on reaching that rather than reaching the subgoal state first. As Thomas(1974) found, this could actually hinder process. Thomas used the missionaries-cannibals puzzle and adapted J. R. R. Tolkien’s hobbits and orcs to replace missionaries and cannibals. To reach the solution quicker, subjects had to move away from the goal state. However, not many were willing to do that. This distraction to reach the goal state caused the subjects to take longer solving the problem. If the subjects found themselves moving away from the goal state, they typically thought they reached a back alley and backtracked. As a result, subjects took longer to solve the problem as they were using the domain dependent heuristic and avoided moving away from the goal. Another heuristic which could hinder correct decision making and problem solving is the availability heuristic. We use data that we can remember better or that which had a bigger impact on us rather than complete data. Thus subjects can make judgements based on what is easier remembered than an unbiased judgement. One availability heuristic that is commonly used is the media bias. The media presents such a great number of fatal accidents that most think that death is more likely to be caused by an accident rather than diabetes. This is not the case, yet because an accident is easier to remember and had a greater impact on the mind most would consider the statement above to be true.

Tips for Throwing a French-Themed Party

For Francophiles, any time is a good time to celebrate French, but there is one holiday in particular that cries out for a French-themed party: Bastille Day. Here are some ideas for a party with some French panache.DecorationsIf youre going for patriotic Bastille Day colors, Americans have it easy: you can just reuse your red, white, and blue bunting from the 4th of July. You might also consider investing in some posters, or make your own by blowing up your favorite photos of France. If youre feeling artistic or playful, decorate place card with little drawings of the Eiffel Tower, or make tiny berets or French flags as party favors.DiscussionsTo get people in a chatty mood, consider one of these topic ideas:- French quotations - offer up a few of your favorite Francophone words of wisdom for discussion.- Today in Francophone history - talk about famous French people who share each guests birthday.- Travel stories - anyone who has been to France will be eager to talk about it. Set up a projector to swap stories and photos.br/>- French culture - theres no shortage of discussion topics when it comes to French movies, plays, literature...- French is better than... everything - I put this together just for fun; see if you can add to my lists, or come up with new ones.- Spanish is easier than French - fact or fiction?EntertainmentDont forget to have some nice French music playing in the background, or even a movie.Food and DrinkNothing says fà ªte like good French food and drinks. Some classic foods are cheese, crà ªpes, fondue, French onion soup, pà ¢tà ©, pissaladià ¨re, quiche, ratatouille, croissants, and a variety of French breads. For dessert, try chocolate mousse, and crà ¨me brà »là ©e. As for beverages, theres wine, champagne, pastis, chartreuse, coffee, and Orangina. Bon appà ©tit  !Vive la France!

Essay about History of the FBI - 953 Words

The early 1900’s gave rise to the Federal Bureau of Investigation. Founded in appalling times filled with tension, the FBI would slowly transform American law to apprehend the nation’s most notorious criminals, and become one of the vital agencies that protect American sovereignty. Influenced by the Progressive Movement and the belief that the federal government’s intervention was required to alleviate injustices in a dark society of corruption where a war between capital and labor raged, President Roosevelt signed Attorney General Charles Bonaparte an unnamed squad of special agents. The squad grew slowly, with its agents poorly trained, mismanaged, undisciplined, and mainly experienced in accounting and the civil rights fields. This†¦show more content†¦World War I and the passage of the Espionage, Sedition, and Sabotage acts gave the Bureau national security work in policing possible issues that target to harm the nation, as did the Palmer Raids- the time of hysteria where Americans were anxious over anarchists belonging to the Bolshevik regiment- provided experience to the Bureau in investigating terrorism. At this point the Bureau was already starting to get organized under the Director John Edgar Hoover, who would soon make the agency a vital part of the national government in his 40 years of directing. (FBI GoV HIS) Hoover quickly transformed the FBI, and made the system highly professional. Prior to him directing, many agents had limited training and were undisciplined, knowledge in law was sufficient to become hired as an agent. Despite this, many agents were subject to corruption due to low pay and because times were hard during the 1920’s- the post war recession, and the rising prohibition era would create an increase in robberies, auto theft, and drug trafficking. However, Hoover was quick and thorough. He weeded out incompetent â€Å"political hacks† and laid out a strict code of conduct for agents to follow and formed the contemporary foundation of the federal agency. The hiring process now consisted of interviews, background checks, and a 2 month training progra m that included physical fitness, defensive tactics, shooting, and further instruction on investigation. Hoover also established the finger printShow MoreRelatedThe FBI : The Background History Of The FBI777 Words   |  4 PagesDid you know it is completely legal for the FBI to misconceive a jury while under oath, in court, to ensure that the nation’s security is protected? Also, you can simply request a copy of your personal file from the FBI and receive it in an email. The Federal Bureau of Investigations is known for their very conspiratorial litigations and highly advanced technology, but there is a lot of information that is widely available to the public eye, in which the people have no knowledge of. I am going toRead MoreHistory of the Fbi Essay726 Words   |  3 PagesHistory of the FBI The Federal Bureau of Investigation was founded in 1908 when the Attorney General appointed an anonymous force of 34 Special Agents to be investigators for the Department of Justice. Before that, the DOJ had to borrow Agents from the U.S. Secret Service. In 1909, the Special Agent Force was renamed the Bureau of Investigation, and after countless name changes, it became The Federal Bureau of Investigation in 1935. When the FBI was established, there werent an abundance ofRead MoreThe History of the FBI Essay1521 Words   |  7 PagesFederal Bureau of Investigation. 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The fascination of TV â€Å"Criminal Minds† has affected many viewers about FBI, however, the real agents are different than they are on TV. As people know, FBI are very mysterious organization. They have many secrets, andRead MoreThe Mission Of The Fbi997 Words   |  4 Pages The mission of the FBI is to protect and defend the United States against terrorist and foreign intelligence threats, to uphold and enforce the criminal laws of the United States, and to provide leadership and criminal justice services to federal, state, municipal, and international agencies and partners. It performs these responsibilities in a way that is responsive to the needs of the public and faithful to the Constitution of the United States. History of the Federal Bureau of InvestigationRead MoreThe Patriot Act Of Terrorism1616 Words   |  7 Pagesfuture terrorists from executing their malicious attacks. 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