Essay Book - Help With Writing a Paper

Essay Book - Help With Writing a PaperIf you are a college student who is concerned about your grades and still want to be able to write an essay, then you should look into buying an essay book on current topics. These books will give you examples of essay topics that other students and teachers have used. It will give you ideas on how to structure your essay. And it will also give you some tips on how to create an interesting essay.You will find that there are several types of essay books that can be purchased. Some of these books are free and others can be purchased for a small amount of money. Before you buy one, however, you need to know what type of essay book is right for you.One of the most important part of the essays is the summary of the subject. While this is a fairly simple topic, many students spend so much time doing research that they forget that the summary is the most important part of the essay. However, this is the one thing that you need to remember to do. The res t of the essay is your responsibility.You also need to realize that there are two types of essay books out there. There are the more expensive, professional-level books that can cost quite a bit of money. Then there are those books that can be found for less money. Either way, you need to make sure that you purchase one that will help you become a better writer.Some of the most famous writers in the world have been published by this book. They include Ernest Hemingway, Ralph Waldo Emerson, Winston Churchill, Henry James, and many more. These people are all great writers and the book has helped them become even better. Many students are unaware of the power of this book until they get to college.If you want to become a better writer, then you need to look into books that offer general purpose books for all levels of writing. You can find the best books for those that you are studying to get a degree in. As you get further from college, you can move on to the more specialized books. T he very idea of the book helps to improve your writing skills.Finding the right essay book is important for any student. You need to get the right one that will help you improve your skills as a writer. Once you do, you will have a better chance of writing an essay with real-world application and communication.

Immigration Is A Major Controversial Issue - 1471 Words

Roman Numeral III Signature Assignment GOVT 2305 MW 8:00-9:20 Danielle Scheurmann 5-4-2015 Immigration is a major controversial issue in today’s government. Some important matters include national security, the economic weight, escalation in drug and weapons trafficking, and human trafficking. Immigration is both beneficial and detrimental to many people, and our country. In my opinion the foremost concern regarding Immigration is National Security. â€Å"More than 10 million undocumented aliens currently reside in the U.S., and that population is growing by 700,000 per year† (Johnson and Kane). This points to a serious problem in our Nation’s security. Our borders are perilously vulnerable. Illegal immigrants flock to the United States in search of better jobs and healthier lifestyles. They hope to live the â€Å"American Dream†. But that dream comes at a costly price. So many undocumented aliens creates an overwhelming security dilemma. â€Å"Even though they pose no direct security threat, the presence of millions of undocumented migrants di storts the law, distracts resources, and effectively creates a cover for terrorists and criminals† (Johnson and Kane). Unfortunately, efforts to decrease the influx of immigrants only encourages these people to move underground. It’s scarily easy for an under documented dweller to simply disappear. This contributes to a society of transgressions, as living illegally promotes crime in all parts of life. Another dilemma of Immigration isShow MoreRelatedThe Issue Of Immigration And Gay Rights1034 Words   |  5 Pagesas well as throughout the world is immigration and gay rights. Today, many immigration and gay rights issues have arisen in numerous cases and have had controversial sides and opinions The issue of immigration has been a controversial topic between the Democratic and Republican parties. The idea of illegal immigrants having the choice to become a legal resident is a major distinction between the two parties. In general, Democrats are seen to favor immigration to the United States. The DemocraticRead MoreA Rogerian Analysis of the Debate over Arizonas Immigration Law1493 Words   |  6 Pagesï » ¿A Rogerian Analysis of the Debate over Arizonas Immigration Law 1. An introduction to the problem and a demonstration that the opponents position is understood. Americas illegal immigration problem is one of the most remarkable failures of the U.S. federal government. Undocumented illegal immigrants, many in our very own neighborhoods, are able evade the reach of our nations laws and regulations with remarkable ease. This is a huge source of anxiety for many tax-paying Americans, who perceiveRead MoreHealthcare Of Current Undocumented Refugees And Immigrants Of The Early Twentieth Century1410 Words   |  6 PagesHealthcare of Current Undocumented Refugees and Immigrants of the Early Twentieth Century Immigration has remained a long-standing, controversial topic in this country with strong public opinions as well as many political disputes over this issue. Laws have been created over time, which support immigration and refugee resettlement, however, these laws have been met with much resistance throughout history. According to the Department of Homeland Security (2012), the number of illegal immigrants andRead MoreImmigration Is The Act Of Movement Of The United States1501 Words   |  7 PagesImmigration is the act of movement of personalities from their country of origin to another one for better lives, education, visitations, job opportunities and also the undertaking of business transactions amongst nations that can either be legal or illegally inclined. The United States being a land of opportunity and a superpower has made the nation one of the most admired countries in the globe (Laidler and Turek, 2014). Its economy and robust foreign policies have catapulted the interest s of manyRead MoreThe Immigration System Of The United States1201 Words   |  5 PagesHowever, the immigration system leaves many who are not among the lucky finding their way legally across the border left with no choice but to either stay put, or illegally come into United States territory. With the increase of immigration around the world, and the upcoming political debates, this issue has become more controversial as time goes on. Along with all of the attention with the issue comes many different positions and viewpoints toward the subject. There is that of major emphasis on borderRead MoreThe Issue Of Immigration Is The United States For Many Years And Its Views On The Matter1450 Words   |  6 Pagesone of his recent presidential candidate speeches, Donald Trump addresses immigration and his views on the matter. After hearing him address this very controversial topic I became very interested. Immigration has been a major issue in the United States for many years and it com es with its own set of positive and negative consequences. Many people hold different stances on whether or not illegal immigration is actually an issue or not. In his speech, Donald Trump bluntly lets America know how he feelsRead MoreCause/Effect of immigration reform971 Words   |  4 Pagesto mind when you think of immigration? What is the United States’ current Immigration Policy? Would you even think that it is considered to be one of the most debatable topics today? Nowadays, many people decide to immigrate to have a better life for themselves and their families. Immigration reform, as it has been called, had been tried during the past years by our very own Congress. Obviously, administrations efforts failed because, currently, illegal immigration is still a platform. Why wouldRead MoreThe Effects Of Immigration On The Middle East1558 Words   |  7 Pagesto better understand the effects of immigration on both societies. One way to measure the general political reaction of each country towards the influx of immigrants. Though such data is constrained by temporal boundaries, a blanket understanding can be gleamed from surveys taken in nations during different periods. Further, in both countries, support for the importance of mainstream right-wing strategies has exacerbated the politicization of the immigrant issue. A survey asking identical questionsRead MoreThe Evolution And Relevance Of Immigration1510 Words   |  7 Pages The Evolution of Immigration: The evolution and relevance of Immigration in the United States. †Another way of indicating the importance of immigration to America is to point out that every American who ever lived, with the exception of one group, was an immigrant himself or a descendent of immigrants,†(Kennedy, 2). The United States is a nation of immigrants. There are, however, many Americans who are not accepting of the fact that immigrants were the reason why this country is able to haveRead MoreIllegal Immigration And The United States1126 Words   |  5 PagesIllegal Immigration Illegal immigration, according to an online dictionary is, â€Å"an alien (non-citizen) who has entered the United States without government permission or stayed beyond the termination date of a visa† (thefreedictionary.com). This issue has been a controversial and divisive topic throughout the world. Illegal immigration is a serious threat to national security. Lack of proper immigration can cause harmful consequences, and while there is much debate over what to do with the many

Healthcare Care Access Disparities in Appalachia - 2544 Words

Health Care Access and Disparities within the Appalachian Region Sherri Drake PIMA Medical Institute Health Care Access and Disparities within the Appalachian Region (NIH, 2002-2006) Health disparities are defined as â€Å"differences in the incidence, prevalence, mortality, and burden of diseases and other adverse health conditions that exist among specific population groups in the United States†. Health care access is the ability of a person to receive health care services as a function of access to medical personnel, supplies and the ability to pay for those services. The Appalachian region consists of thirteen states and 420 counties, in which the entire state of West Virginia is in Appalachia, along with the mountainous portions of†¦show more content†¦The 18% poverty level of 2008 is improved from the 33% level of the 1960’s, this decrease is attributable to an increase in educational attainment and income, resulting in lower levels of poverty. Borak, Salipante-Zaidel, Slade Fields (2012) state the following Education is also strongly linked with health status; limited education is regarded as a â€Å"precursor to poor health†Ã¢â‚¬ ¦In general, the counties with lowest educational attainment were â€Å"concentrated in central Appalachia, especially in the mining regions,† where health status is generally worst. Even with some improvements in the region, Appalachia continues to linger below the U.S. average. (Halverson Bischak, 2008) Suggests that two socioeconomic factors stand out when evaluating health disparity among mortality rates and those are poverty levels and the percentage of persons who do not have health insurance coverage. Behavioral risk factors in the region have a higher prevalence of obesity, smoking, lack of exercise and poor use of cancer screenings available than the U.S. national average. Again, the central subregion of Appalachia is among the most affected as this area tends to be more geographically rural. Nutrition is a major issue and low income levels often dictate poor food choices. Some areas may have only one small grocer with limited selections available. Exercise becomes more difficult for people who become obese, which often leadsShow MoreRelatedEvaluation Of Leininger s Theory Of Culture Care Diversity And Universality1275 Words   |  6 Pages Evaluation of Leininger’s Theory of Culture Care Diversity and Universality Camille E. Dantzler Simmons College of Nursing â€Æ' Though not presently practicing, my long term goal is to provide primary care to the underserved rural population in my home state of West Virginia. Due to health disparities, this population is plagued by preventable disease. West Virginia is commonly referred to as the fattest state in the country. Along with Mississippi, it ranks number one for obesityRead MoreRural Areas Across The United States1140 Words   |  5 Pagesspecialists available to care for them. Rural adults also face barriers due to distance and lack of transportation (Bennett, Lopes, Spencer, Hecke, 2013). Disparities between rural and urban areas show that rural residents have lower health status overall. Specifically, rural women have fewer accesses to health care than women of urban areas, which have lead to worse health outcomes. Many rural areas across the United States lack women’s health providers, primary and specialty care, screening servicesRead MoreProviding Health Care For A Rural Village1762 Words   |  8 Pages1 Providing Health Care in a Rural Setting Brigitte Tampon-Aragon and AJ Alcover W.R. Farrington High School January 30, 2015 2 Table of Contents Abstract†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.......†¦..Page 3 Introduction†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.†¦....Page 3 Factors that should be considered†¦ A. Income/ Support.†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦...†¦.†¦Ã¢â‚¬ ¦.†¦.†¦..Page 4 B. Location†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦...†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦....†¦Page 5 C. Culture†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦...†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..†¦Ã¢â‚¬ ¦Page 6 D. Education (Communication barriers, language barriersRead MoreRural Veterans Face A Special And Alarming Set Of Social Justice Issues Essay2348 Words   |  10 Pagesof social justice issues related to healthcare. Overall, there are 5.3 million veterans residing in rural communities (Office of Rural Health, 2016). A total of 44 percent of those who enlist to serve in the military hail from rural areas of the United States (Gale Heady, 2013). Regardless of their bravery, upon returning to civilian life these honorable men and women are met with social justice issues and limitations when attempting to access proper healthcare. As the veterans who served in recentRead MoreVulnerability And Risk Of Poor Health3488 Words   |  14 Pagesfew apply a model of vulnerability to rural populations. The purpose of this paper is to critically analyze Flaskerud Winslow’s vulnerable populations conceptual framework in order to explain the existing health disparity and vulnerability a mong rural communities. POPULATION AND DISPARITY Farming, ranching, logging, and mining as well as places of beautiful scenery, relaxation, and recreation are often equated with rural life. The word rural brings to mind images of Midwestern farming communities

Hawthorne Studies free essay sample

The Hawthorne Studies were developed as a human relations movement in organizational management to identify strengths and competencies in workers and to better manage, measure, develop, and improve worker capabilities (Baack, 2012). The primary focus of the Hawthorne Study was centered on an individual in the work place, not the individual’s rate of productivity, like that of the Scientific Management approach, which was based on punishment and fear. The scientific method created stressful conditions. The employee’s occupation was determined solely on productivity results. Workers were considered expendable with motives based primarily on financial gain. The Hawthorne Study focused on the alteration of employee conditions. It concluded subjects were more productive when experiencing enjoyable conditions and positive interactions. Employees that had fun at work and were not called out for poor for performance had less stress and were inclined to form cohesive groups that remained loyal to the firm. Unlike the Scientific Management approach that dehumanized employees by focusing on productivity alone, the Hawthorne approach concluded that workers are motivated by more than money (Baack 2012). We will write a custom essay sample on Hawthorne Studies or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Components of this study have can have great impact on individuals not motivated by money or power who build trust based on professionalism and performance. These individuals thrive in an environment that reflects a positive and enthusiastic attitude. They are more productive in an atmosphere where people express gratitude and appreciation to co-workers and employers equally. They are happy to work where they are valued, respected, the leader displays ethical behavior and cares deeply about the institution, staff members and the environment. These are the mechanisms that impact our lives and create long term relationships personally and professionally within and outside of the organizations we are affiliated with. The interpersonal relationships and ethical competence of a company and its leaders is the pretext to why people offer loyalty and experience endurance with an organization. Baack, D. (2012). Organizational Behavior. San Diego: Bridgepoint Education, Inc.

Waste Management Strategies in Australia

Table of Contents Situational Analysis Energy Situation Waste Situation Problems of Landfills Waste-to-Energy Technologies Conclusion Reference List Waste Management in Australia is becoming a serious issue. This is because the population of the country is increasing leading to the creation of more waste. In addition, the rate of growth of urban centres is leading to the generation of concentrated pools of waste. Australia uses landfills to dispose waste.Advertising We will write a custom essay sample on Waste Management Strategies in Australia specifically for you for only $16.05 $11/page Learn More Landfills ensure that waste does not become an eyesore. However, landfills lead to other problems in the environment, and rob the country of waste recycling opportunities. This paper proposes that Australia is better off generating energy from waste, rather than dumping the waste in landfills. Situational Analysis The situation in Australia in regards to energy and waste has several facets. The country has a very large land area, which it can use for waste disposal. However, this strategy is not sustainable given the long-term impact of current waste disposal practices. Energy Situation Australia has vast mineral deposits. The minerals include coal, gas, and oil. However, the quantity of these energy deposits is not sufficient to guarantee energy supplies for the country. The amount of oil produces in Australia peaked in 2000 and has been dropping since (ABS 2010). The country has not developed any new wells in the recent years. This has made Australia a net importer of oil. The country’s reserves are not sufficient to meet its domestic needs. Therefore, the country imports large quantities of oil. In fact, Australia’s trade balance is import-biased. The country imports more goods and services than its exports to other countries. The country’s energy supply is not growing at the same rate with its energy demand . Models indicate that if the country does not make an effort to increase its energy production facilities, it will become necessary to ration power in some states as early as 2014 (ABS 2010). In this regard, Australia needs to think about how to increase energy supply in line with its growing needs. The country has very few renewable energy projects despite vast potential for ethanol production, and energy generation from solar and wind. The country has vast deserts that would be ideal for solar power generation. It can also produce ethanol for blending with imported oil to reduce its overall reliance on imported oil.Advertising Looking for essay on environmental studies? Let's see if we can help you! Get your first paper with 15% OFF Learn More At the same time, the country has a very long shoreline that can support the production of vast quantities of wind power. This shows that the country has a lot of potential to change its energy mix. Eventually, the country wil l need to address its energy situation because the current mix is unsustainable. Waste Situation Waste management in Australia is becoming a matter of increasing concern. The population centres in the country are increasing in number. This is in turn increasing the amount of waste generated in settlements. The increase in the quantity of waste generated in the country has a direct link to the increase in the per capita income of the country. The country’s income per capita went up in the last ten years. There is a link between increases in income per capita and increases in the quantity of waste (Dhir, Newlands Dyer 2003). Thirdly, the country relies on landfills for the disposal of most of its waste. The volume of waste disposed in landfills went up by 12% between 2001 and 2007 (ABS 2010). The volume of waste disposed in landfills in 2001 was 19 million tonnes (ABS 2010). This volume grew to 21.3 tonnes in 2007 (ABS 2010). This trend shows that the rate of growth in the vol umes of waste disposed in Australia went up significantly. However, the growth in the rate of waste disposed in landfill is still on the rise because is the increase in the total volume of waste produced by landfills. There is increasing interest in diversion of waste from landfills to recycling plants. The amount of water diverted from landfills increased from 36% in 1999 to 52% in 2007 (ABS 2010). This shows that the country’s interest in recycling of waste went up during this period. The degree of usage of landfills is still very high in Australia. Landfills are relatively cheap to use. However, they lead to several environmental concerns. Problems of Landfills Landfill technology arose from the need to find a permanent ways of dealing with waste. Waste disposal in landfills refer to burying of waste. This requires the excavation of large areas for use in dumping waste. It is also possible to use natural depressions for water disposal. Decommissioned mines are also ideal f or use as landfills because they reduce the amount of work needed to create a landfill.Advertising We will write a custom essay sample on Waste Management Strategies in Australia specifically for you for only $16.05 $11/page Learn More The first concern associated with landfills is the emission of greenhouse gases (Khan, Prior Islam 2008). Landfills lead to the generation of greenhouse gases because of anaerobic decomposition of organic matter. The gases produced in landfills include methane, ammonia, and carbon dioxide. Green house gases from landfills contribute towards global warming. The second problem associated with landfills is ground water pollution (Greg, Simonton Beruvides 2003). Landfills contain all types of waste, which include electronic waste. Over time, chemical pollutant in the waste and chemicals resulting from the decomposition of waste leech into ground water. This leads to groundwater contamination. This can affect agriculture and the use of groundwater for domestic or industrial uses. Thirdly, landfills affect land use. Usually, waste disposal companies cover landfills with a thick layer of soil and then compress it. This usually results in a flat surface that can support some uses, such as recreational activities. However, there are significant limits on the economic uses of such land. The volume of waste disposed in Australia shows that the land areas affected by landfills is quite large. Furthermore, this area is increasing. This means that the country is losing viable land to landfills. The fourth problem of landfill use is that they can give rise to spontaneous fires because of the production of methane (Dhir, Newlands Dyer 2003). If a landfill has sufficient organic matter such as food and agricultural waste, their decomposition will produce methane pockets. The methane can ignite spontaneously if there are exothermic reactions inside the landfill. Such fires can cause injuries, and usually lead to f urther air pollution from the landfills. Waste-to-Energy Technologies Australia has several options on how to convert its waste to energy. The conversion of waste to energy will lead to several benefits for the country. First, the country’s reliance in oil will reduce because it will have an alternative source of energy. Secondly, the damage that landfills currently cause to the environment will cease. This in turn will lead to a reduction in the global supply of greenhouse gases. A number of options exist for Australia on how to turn its waste to energy. The first option available to Australia is the conversion of organic waste to biogas. The production of biogas will take advantage of the food waste generated by Australian households, as well as organic waste from farms and factories. Biogas technology is now very advanced. It is possible to bottle it and send it to factories or homes that do not have piped gas. In addition, the country can develop biogas-powered power stat ions to generate electricity. The second option the country can use to convert its waste to energy is by making fuel pellets from organic matter (Greg, Simonton Beruvides 2003). Waste from industrial processing and agricultural processes can be compresses into energy pellets that can fuel pellet generators.Advertising Looking for essay on environmental studies? Let's see if we can help you! Get your first paper with 15% OFF Learn More Thirdly, the country can develop special incinerators that can burn all types of dry waste for heat recovery applications. Urban waste contains many types of materials. An incinerator can help to burn all this waste without the need of segregating it. This technology requires the use of flue gas cleansers to remove toxic materials from the stack smoke. It also calls for fly ash capture to eliminate air pollutants. The fourth energy recovery option is extracting certain types of waste for recycling. For instance, the country can cut its need for power to smelt aluminium by recycling aluminium cans. Recycling of waste reduces the need for manufacturing some products. Conclusion In conclusion, Australia has several options in regards to waste management. The best approach for handling its waste is by converting its waste to energy. The technologies already exist. The only requirement is investing in these technologies. Failure by the Australian government to invest in waste management technologies may lead to extensive environmental damage. Reference List ABS 2010, Waste: Waste Disposed to Landfills, https://www.abs.gov.au/ausstats/abs@.nsf/Lookup/by%20Subject/1370.0~2010~Chapter~Landfill%20(6.6.4). Dhir, R, Newlands, MD Dyer, TD 2003, Sustainable Waste Management, Thomas Telford, Reston, VA. Greg, H, Simonton, J Beruvides, M 2003, ‘Engineering Economic Analysis of a Cotton By-Product Fuel Pellet Operation’, Journal of Cotton Science, vol 11, no. 3, pp. 205-216. Khan, MM, Prior, D Islam, MR 2008, ‘Zero-Waste Living with Inherently Sustainable Technologies’, in Perspctives on Sustainable Technology, Nova Publishers, New York, NY. This essay on Waste Management Strategies in Australia was written and submitted by user Zion Henderson to help you with your own studies. You are free to use it for research and reference purposes in order to write your own paper; however, you must cite it accordingly. You can donate your paper here.

Use of Cholinesterase Activity in Environmental Monitoring †Research Paper

Use of Cholinesterase Activity in Environmental Monitoring – Research Paper Free Online Research Papers Use of Cholinesterase Activity in Environmental Monitoring: Importance of Kinetic Parameters Determination In Estaurine Fish Research Paper Abstract The aim of the present work was to determine the kinetic parameters and cholinesterase (ChE) activity from two teleost fishes: the croacker Micropogonias furnieri (Scianidae) and sea catfish Cathorops spixii (Ariidae), to verify their suitability as sentinels of aquatic pollution by anticholinesterasic compounds. Fish were collected in a reference and in a polluted site in Southern Brazil and brain ChE was used as enzyme source. Inhibition kinetic parameters employing ChE from C. spixii showed that fish collected in the reference site presented more affinity (Ka) for eserine than those collected in the polluted site and the contrary was observed for the carbamylation constants (Kc), overall resulting in similar inhibition constants (Ki). Considering the extremely low sensitivity to in vitro inhibition by eserine, M. furnieri seems to be an unsuitable species to be employed as an environmental sentinel for pollution of anticholinesterasic compounds. Results obtained in the present study point to the importance of kinetic studies when cholinesterasic activity is employed as a biomarker in environmental quality monitoring programs. Keywords: biomarkers, cholinesterase, eserine, fish, kinetic parameters, estuarine environments 1. Introduction Some pesticides, including organophosphorus and carbamates, are known to selectively inhibit cholinesterase (ChE) activity (Valbonesi et al., 2003). When directly released into the environment, these molecules can reach rivers and sometimes the sea, leading to the contamination of various aquatic ecosystems (Mora et al., 1999). The relationship between the presence of these kind of compounds and ChE activity has been widely studied and employed as a biomarker in aquatic invertebrate and vertebrate species (Bocquenà © et al., 1997; Sturm et al., 1999; Rodriguez-Fuentes Gold-Bouchot, 2000; De la Torre et al., 2002). The use of biochemical measurements in organisms as an indicator of pollution can complement chemical analysis, giving information about the adaptive or deleterious responses in organisms exposed to a certain amount of chemicals. Moreover, among biological effects of pollutants, biochemical ones occur more quickly, thus providing earlier warning signal before other toxicological end points, including death, are evident. (Livingstone, 1998). Since organophosphorus and carbamates have a relatively short half-life, the assessment of cholinesterase (ChE) inhibition is a useful tool to evaluate their environmental impact on aquatic biota, even when they are not longer detectable in the environment (Valbonesi et al., 2003) and, as mentioned above, considerable efforts have been made in the last two decades to develop and validate measurements of biological parameters to complement the information given by the chemical analysis of contamination. The main advantage of using biomarkers at low levels of biological organization is the possibility to detect deleterious effect pollutants before being evidenced at higher levels of biological organization. Among biochemical markers, the measurement of fish cholinesterase activities has become a classical tool for biomonitoring pollution in marine (Bocquenà © et al., 1990) and continental waters (Sturm et al., 1999). However, before employment of ChE as a biomarker of anticholinestera sic compounds in monitoring programms, is important to analyze the sensitivity to this kind of molecules (Varà ² et al., 2003), also for the fact that potential effects of organophosphorus and carbamate pesticides are widely variable for different fish species (Ferrari et al., 2004; Silva Filho et al., 2004). The dynamics of the interaction of ChE with organophosphate and carbamate compounds has been shown to depend largely upon the affinity of a particular insecticide for the enzyme, commonly represented as the enzyme affinity for a particular insecticide, which is commonly represented as the affinity constant Ka (Wang Murphy, 1982). Silva Filho, et al. (2004) showed extremely great differences in the inhibition kinetic parameters between several fish species, an important point to be considered in the selection of a sentinel organism in biomonitoring programs. In this context, the concentration of eserine that inhibits 50% of cholinesterase activity (IC50) and inhibition kinetic parameters are important characteristics for the selection of sensitive ChEs to be employed as biomarkers. Considering the facts previously described, the objectives of the present study were to determine the kinetic parameters and eserine sensitivity of brain ChE from two estuarine fish species, Micropogonias furnieri (Teleostei: Scianidae) and Cathorops spixii (Teleostei: Ariidae) collected in polluted and non-polluted sites in Southern Brazil. The white mouth croaker Micropogonias furnieri (Desmarest, 1823), is a subtropical fish found in muddy and sandy bottoms in coastal waters. Its feeding habit varies along the ontogenic development and season: juveniles feed on benthic migratory crustaceans and sessile mollusks, while adults are benthic feeders, occasionally preying on fish (Isaac, 1998). Sea catfish Cathorops spixii (Spix and Agassiz, 1829) is a demersal tropical cat fish found in shallow coastal marine waters and brackish estuaries, lagoons and river mouths, as well as in hypersaline waters. In South America, its distribution includes Atlantic and Caribbean rivers and estuaries from Colombia to Brazil. Adults feed mainly on invertebrates and small fishes, while juveniles feed on amphipods, isopods and copepods (Cervigà ³n et al., 1992). This study is part of a research project developed along the Brazilian coast, the RECOS (â€Å"Uso e Apropriaà §o de Recursos Costeiros†) project in the scope of the Millenium Institute (Brazilian Ministry of Science and Technology). One of the objectives of RECOS project is the standardization of sampling protocols, quantitative and qualitative evaluations of biochemical, physiological and histological biomarkers in different animal species collected from polluted and non-polluted sites. In the present study biochemical biomarker responses were analyzed in fish collected in different seasons (winter and summer), to evaluate the natural variability of ChE activity and its sensitivity to eserine inhibition. 2. Materials and methods 2.1. Chemicals Acetylthiocholine iodide, eserine (physostigmine), 5, 5’-dithiobis (2-nitrobenzoic acid) (DTNB) were obtained from Sigma (St. Louis, MO). The protein content was determined using a commercial kit from Doles Reagentes (Belo Horizonte, Brazil), based on Biuret method. 2.2. Organisms Micropogonias furnieri was collected in summer and winter seasons in reference (unpolluted) site, â€Å"Ilha dos Marinheiros† (32 °02’005† S and 52 °12’151† W) and in a polluted site, â€Å"Saco da Mangueira† (32 °04’369† S and 52 °06’473† W). Cathorops spixii was collected only in summer in a reference site, â€Å"Baà ­a das Laranjeiras† (25 °31’271† S, 48 °29’690† W) and in a polluted one, â€Å"Baà ­a de Parangua (25 °21’050† S, 48 °25’97† W) (Figure 1). In every case, ten fish were collected in each season and site. Immediately after collection, fish were anesthetized with benzocaine (200 ppm), measured (total length and weight) and head isolated and stored at -20 oC until arrival at the laboratory, where they were kept at -80 oC before biochemical determinations. It should be mention that up to date no chemical characterization was perfo rmed in the locals referred as polluted and unpolluted. However, the local â€Å"Ilha dos Marinheiros† is far from any obvious pollution source, whereas â€Å"Saco da Mangueira† is located near to fertilizer industries. ELTON/ADALTO/VANESSA: Uma frase equivalente para os locais de amostragem no Paranagu seria importante a meu ver. 2.3. Enzyme extraction Fish whole brain was dissected and then homogenized (1:20) in cold phosphate buffer (0.05 M) containing 20% glycerol at pH 7.40. The homogenate was then centrifuged at 850 xg (4 °C) for 15 min. The supernatant was again centrifuged at 12,800 xg (4 °C) during 15 min. The supernatant of this last centrifugation was used as enzyme source. 2.4. Enzyme assay Cholinesterase activity was determined using the method described by Ellman et al., (1961). Phosphate buffer (0.05 M, pH 7.40) was placed at least for 15 min in a water bath at 25 °C. Aliquots of homogenate, DTNB and substrate (acetylthiocholine iodide- ATch) were then added and the absorbance (412 nm) was immediately determined, during 90 s, in an ELISA reader (Victor 2, Perkin Elmer). To determine substrate affinity (Km) and maximum cholinesterase activity (Vmax), different ATch concentrations ranging from 0.025 to 9 mM were assayed, being the cholinesterase activity expressed as nmol/min/mg proteins. In each experiment, a first blank without substrate was assayed to evaluate the reaction of protein thiol groups with DTNB, and a second blank without sample was used to estimate the rate of spontaneous substrate hydrolysis. 2.5. In vitro enzyme inhibition by eserine The sensitivity of brain ChE to inhibition by eserine was investigated. ChE activity was measured on extracts after 5 min of incubation at 25 °C with several eserine concentrations, ranging from 110-4 to 1 mM. Enzyme activity was measured as described above. Inhibition was expressed as a percentage of ChE activity after eserine exposure respect control enzymatic activity. Kinetic parameters of enzyme inhibition were also estimated employing the carbamate eserine. The inhibition of an enzyme (E) with an inhibitor (I) can be summarized as follow (Main, 1964): where (EI)R represents a reversible enzyme-inhibitor complex and (EI)I an irreversible one. The affinity equilibrium constant is defined as Ka= K-1/K1 and Kc represents the carbamylation constant (Hastings et al., 1970). The bimolecular inhibition constant, Ki is defined as Ki= Kc/Ka. The constants Ka and Ki can be estimated according to the following equation: 1/i = ?t/(2.303*?log10 ?)*Ki – 1/Ka, where i represents the inhibitor concentration and ?t/(2.303*?log10 ?) is the reciprocal of the pseudo-first-order rate of enzyme inhibition at a fixed concentration (i) of the inhibitor (Monserrat et al., 2002). Six concentrations ranging from 0.3 to 10 mM were tested, at least in duplicate and after four or five different times of incubation (range: 30-360 s). 2.6. Data analysis Enzyme kinetic parameters (Vmax and Km) were estimated by fitting experimental data to Michaelis-Menten equation. IC50 values were obtained through probit analysis (Monserrat Bianchini, 1998). Linear regression and ANCOVA was employed to estimate and compare inhibition kinetic parameters (Ki and Ka). Statistical analysis of enzyme activity was performed using ANOVA followed by a posteriori comparisons using the Newman-Keuls test. A significance level of 5% was employed in all cases. 3. Results Fish from of both species were homogeneous (P>0.05) in length and weight at the different sampling sites and seasons analyzed, and for this reason only the general mean is reported. For M. furnieri, the mean weight and total length of fish collected were 25.78  ± 7.72 g and 14.41 ±1.83 cm, respectively (n= 40). For C. spixii, mean weight and total length of sampled fish were estimated in 35.77 ±11.45 g and 16.14g ±1.56 cm, respectively (n= 40). The Michaelis-Menten constants (Km and Vmax) for brain ChE of M. furnieri showed different patterns. Km values were statistically similar (P>0.05) in all seasons and sampling sites. On the other hand, Vmax showed a complex response, since fish collected in the reference site showed higher values (P0.05) in the Km values was observed in summer, the only season analyzed. However, higher (P

Global Security Has Evidently Hindered the Enjoyments of Human Rights Research Paper - 2

Global Security Has Evidently Hindered the Enjoyments of Human Rights - Research Paper Example â€Å"Terrorism has the potential to undermine civil society, destabilize governments, threaten economic and social development and importantly pose danger to global peace† (126). All these factors have a direct and visible impact on the delights of human rights. Needless to say, security, by all means, is a basic human right, and the protection of the citizens is as well basic obligation of any government. States and a government evidently have an obligation to guarantee the human rights of their citizens and other visitors by instituting positive measures to counter terrorism and apprehending the offenders to face justice. (Mack, pp. 14) The United Nations saw its emergence in 1945 above all; it was born to save future generations from the bitter scourge of war. It would guard human security and ensure that the horrors of the World Wars have never occurred again. Sixty years down the line, we are all familiar with the biggest global security threats we face now, and in intuitively, the decenniums ahead stretches beyond States waging destructive war. They extend to environmental degradation and infectious disease; poverty; violence and war amongst states; the spread and potential use of nuclear, biological, chemical and radiological weapons; and trans-boundary organized crime; terrorism. The threats range from state as well as non-State actors and State security to human security. The major preoccupation of the UN organizers was firmly held to State security (Nowak, pp 125). When the state members concurred on creating a new system of collective state security, they defined that in the traditional military sense: a system in which every States would join hand and pledge that â€Å"aggression against one is aggression against all†(pp. 13), and fully commit themselves in that happening to respond collectively.