How does adenosine diphosphate (ADP) activate platelets Essay

How does adenosine diphosphate (ADP) activate platelets - Essay Example ADP induces platelet shape change, calcium flux, and inhibition of adenylyl cyclase, leading to aggregation. Kahner et al. (2006) also stated that rapid shape change, release of granular contents, generation of lipid mediators, and aggregation occur during platelet activation. Various surface receptors involved in platelet activation include G protein coupled receptors (GPCRs), integrins and glycoprotein receptors. Adenosine diphosphate (ADP) (released from platelet granules) and thromboxane A2 (generated within platelets) are the secondary mediators that activate other resting platelets, resulting in the amplification of initial physiological haemostatic response. Adenosine nucleotides are released following platelet activation signal through the P2 purinergic receptors on the platelet membrane. The two types of P2 receptors are ligand-gated cation channels (P2X), or GPCRs (P2Y). Till date, seven different P2X receptors (P2X1)) and eight distinct P2Y receptors (P2Y1,2,4,6,11-14) hav e been identified which were cloned from mammalian tissues. P2Y1, P2Y12, andP2X1 subtypes are the P2 purinergic receptors expressed on platelets and their physiologic agonists are ADP, ADP, and adenosine triphosphate (ATP), respectively. These receptors, when activated by the agonists, initiate a complex signaling cascade that ultimately results in platelet activation and thrombus formation. The physiological agonist for the P2Y1 receptor is ADP. This receptor can also be stimulated in vitro by 2MeSADP, ADP, APDaS and ADPbS in the decreasing order of potency and is involved platelet shape change and aggregation brought about by ADP. P2Y12 is coupled to Gi2 protein. Upon stimulation, the Ga and Gbc subunits of the heterotrimeric G protein dissociate and activate various signaling pathways. The Gai2 is found to be responsible for ADP-mediated inhibition of adenylyl cyclase and subsequent reduction in cytosolic cAMP concentrations. This is one

How Wi-Fi Works Essay Example | Topics and Well Written Essays - 750 words

How Wi-Fi Works - Essay Example Considering the significance that Wi-Fi has in technological development and advancement, it is essential that critical analysis is done on its mode of operation (Harrington 18). Based on such a perspective, this paper discusses and analyzes the operation mechanics of Wi-Fi, in easier terms, how Wi-Fi works. As already stated above, Wifi is a technological aspect that allows for the sharing of data and internet connectivity, where it emits frequencies between 2.4 to 5 ghz depending on the data amount available on the network used (Trulove 102). This is a very higher frequency compared to that used by cell phones and televisions and hence allows for the distribution of more data. It is projected that by the pace of current technological development, it will be possible to access the wireless network from any part of the world at any one particular time. One aspect of substantive significance in the study of technology and most especially the wireless technology is that despite its widespread use across the globe, very few individuals actually understand even the basics involved in the operation of these wireless technologies (Wei 61). Like other wireless connections, Wifi uses radio waves for the transmission of information over a particular network (Wei 78), with a major advantage of its high compatibility with almost all operating systems, over other many technologies. However, one critical contrast about Wifi in comparison to other wireless connections is that whereas other wireless connections require access points and routers, essential for the coordination of network traffic for many clients, Wifi operates without any access point instead it supports ad hoc mode connection type allowing devices to network in a peer-to-peer fashion (Harrington 29). In their operation, Wifi works with 802.11 standards of networking (Trulove 107).

Factors contributing to increase of obesity amongst women population Essay

Factors contributing to increase of obesity amongst women population within the United Kingdom - Essay Example This essay "Factors contributing to increase of obesity amongst women population within the United Kingdom" discusses the problem of the obesity among the women population of the UK. The main factor that is contributing to increase in obesity among women in the UK is poor dietary choices. Women are the leading consumers of foods with high calories and extra carbohydrates that are not utilised by their bodies (Kopelman, Caterson and Dietz, 2010). Eating fast food in restaurants during lunch breaks in the workplace, skipping of breakfast and consuming high-calorie drinks are some unhealthy eating habits that are common amongst women in the United Kingdom (Alters and Schiff, 2013). It is common for women to oversized portions and sweetened beverages that contain high levels of carbohydrates and other nutrients that contribute to accumulation of fat in the body. The second leading factor that is contributing to increase in obesity among women in the UK is sedentary lifestyle. Many women in the UK engage in less physically demanding work due to mechanised transport systems and labour-saving technologies in the workplace. In this case, women rarely engaged in physical fitness activities such as recycling or walking since they are committed in household duties or corporate work (Cappuccio, 2010). Accordingly, most of the women in the UK prefer relaxing in their houses while watching television, browsing the internet and playing computer games thus leading to excessive calories in the body that are stored as fat.

Ethical interview Coursework Example | Topics and Well Written Essays - 500 words

Ethical interview - Coursework Example From this illustration, it is evident that this method is not only used the moment a partner dies (Garcia, 2001). From the matter and hand, Karen Capato who used has husbands through the Vitro fertilization gave a result of twins. It is a fact that some children have been denied a right of accessing the heritage on how they were born. The governing bodies have to propose a bill that advocates genetically manipulated children to find and understand how they came into existence and to gain their inheritance. The attitude and the perception by the state not to recognize these children as humans even though they are issued with the birth certificates is an overwhelming factor that needs to be eliminated. Despite technology being used, what matters is that the result that will be generated is a human being. Putting these children in the state of doubt makes them lose confident of themselves being in mind their conception was as natural as compared to the other kids (Salumets, 2003). Globally, the matter grown to a higher level because the number of children produced with the assistance of technology has continued to grow. Its growth has gotten a bigger number of complex ethical issues especially those that are associated with the matter at hand. When it comes to the social security benefits entitlement for these children conceived through means, I suggest that there should be some limits in the decision that are proposed by the supreme courts. For the limit to be implemented there must be considerations and according to my opinion, I suggest this by the use of utilitarian ethical theory and the principle of fairness (SANKAI, 2000). When children are conceived using genetic manipulation, there are legal difficulties that that compounds the individual to gain the inheritance. Through applying the principle of justice, we focus on the equitability of the distributional risks because of the limited resources available. The

The Fair Tax should be Implemented in the United States Essay

The Fair Tax should be Implemented in the United States - Essay Example NSBA was the first small business organization to give a pass to fair tax to apply to all consumers’ goods and services at the consumption final point at 23 percent which is single rate and a retail sales tax that is national. The fair tax enhances the fact that there is the same rate of tax without exemptions and exclusion on every taxpayer. There will be a total tax exemption to those who share on the cost of the government. The tax rate is determined and affected by the rate of purchase. To promote reutilization, the used items will not be subject to tax. In goods and services production, the purchase from business to another business will not be taxable. This fair tax will thus act as a replacement on the federal income tax on individuals, tax on capital gains, tax on self employment, and taxation on gifts and the estates. (Kotlikoff and Laurence, 2005). According to congressional report p 20190, the fair tax of 2003 was introduced to promote fairness, freedom, and economi c opportunity by repealing the income tax and other taxes, abolish the revenue services that are interest, and enacting a sales tax nationally. In another term, the fair tax can commonly be called national sales tax. It is an essential tax reform item and that was unjust to replace it with a tax system that is simple and fairness. 2.0 Explanation of Fair Tax Act The fair tax Act of 2003 would repeal taxation on individual income, taxation on corporations, taxes on capital gains, payroll taxes, taxation on self employment, gifts and Estate taxes in lieu of 23 percent tax on all goods and services final sales. These taxes eradication will bring about simplicity and equality within the US system of taxation. The bill also provides transactions on business to business tax relief. The transactions are not subject t tax on sales including transactions on products and this helps in abrogating double taxation that may arise. Under the bill of fair tax, Medicare benefits and social security would not be touched. To either one of the vital programs, there would be no financial reduction. The trust fund revenue source for the two programs would be replaced by sales tax revenue instead of payroll tax revenue. (United State Congress et al, 2007 p 225) According to Tomlinson Shelly-Ann, (2007), the fair tax act proposed that American would receive a check on money rebate that is equal to spending up to the federal poverty level according to the Department of health and Human guidelines. After the purchase of necessity, the rebate would ensure no American pays taxes. The fair tax act will create fairness and a simpler taxation system and allows all Americans the freedom to determine their own priories and opportunities. The amounts of rebate calculations are adjusted to the inflation account. In order for household to become eligible for the rebate, they would register only once in every year with the authority that administers sales tax. The name together with the social se curity number is submitted by the member of the household. The funds are either a submitted by check via US Email, Electronic fund transfer, or a smartcard which is used like a credit card of a bank by administration of the social securit

Easter Offensive 1972 Research Paper Example | Topics and Well Written Essays - 1250 words

Easter Offensive 1972 - Research Paper Example The size and ferocity the offensive unleashed to the waiting American and Vietnamese forces had been under estimated thus leading to them being overwhelmed by the North Vietnamese Army (NVA). The involvement of John Ripley in the Easter offensive which lasted over three hours is also reportedly the end of the North Vietnam Army push to conquer the south. The following paper is a description of the Easter offensive that occurred in Dong Ha when the NVA’s Push for the Southern Vietnamese nation. It also describes the involvement of John Ripley in combat while still exploring the under looked issues in the mission. The Easter Offensive Before the South Vietnamese Operation Lam Son which was to fail, discussions had been held by the Hanoi leadership on the Easter offensive. This was during the 19th Plenum of the Central Committee of the Lang Dong party in 1971. It is reported that by December that same year the Politburo had resolved to launch a mega attack on the southern region of Vietnam (George 75). This would be favored by the elections that were to take place in the United States the following year. In addition, the US marines in the area were being withdrawn from Vietnam. Consequently, the Army of the Republic of Vietnam (ARVN) was increasingly being stretched over the South Vietnam border. It is also reported that the ARVN was increasing losing their ground on the border to an estimated 600 miles to the NRV. Moreover, the ARVN was offensive was a promising memory after the failure of the Laos mission. As described by George (24), ‘This decision marked the end of three years of political infighting between two factions within the Politburo: those members grouped around  Truong Chinh, who favored following the Chinese model of continued low-intensity  guerrilla warfare  and rebuilding the north; and the "southern firsters" centered around Defense Minister Vo Nguyen Giap and supported by First Party SecretaryLe Duan  (both of whom supporte d the  Soviet  model of big offensives)’ . The decision would be to use a combined mega guerilla attack on the security forces. This is also supported by Nalty (

Outline the key topics that underpin the study of Social Policy Essay

Outline the key topics that underpin the study of Social Policy - Essay Example Social policy encourages similar living standards for everyone in the society. This includes providing equal education, healthcare, employment, money, security, and other important necessities of life. There are some important bodies involved in social policy as well and these include government, official bodies, charitable organizations, social human beings, neighbors, and families (Alcock, May, & Wright, 2012). Social policy is not only concerned with what the government does for citizens. However, social policy refers to the social spending by any individual for other. Social policy defines the role of government to spend for the people. These spending include pension funds, hospitals, and schools. Based only on government, the social policy can vary depending upon several factors including economic situation. Social policy is a wide subject accompanying different approaches including sociology, psychology, history, economics, demography, and human geography. Therefore, it could also be defined as combining approaches from the different social sciences. Social policy may also include other important aspect such as the amount of spending that the government should make on defense, law and order, industry and agricultural employment, transport, sport and culture, international development, and debt interest. Although the government of most of the countries do more than one-third of the collected wealth, but the private spending in social policy is more than the services government providing. Understanding the term of doing well or good to human beings is complex. It includes different factors and the study of these factors is social policy, and social science. The above mentioned five key factors of social policy are given birth by the societies just because either society understands and recognizes the social human needs and gives an expression of social welfare. Another important believe of the social policy is that when it is