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Free research papers and essays on topics related to: parasites

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  • Parasites And Their Virulence - 1,242 words
    Parasites And Their Virulence ABSTRACT Why do some parasites kill the host they depend upon while others coexist with their host? Two prime factors determine parasitic virulence: the manner in which the parasite is transmitted, and the evolutionary history of the parasite and its host. Parasites which have colonized a new host species tend to be more virulent than parasites which have coevolved with their hosts. Parasites which are transmitted horizontally tend to be more virulent than those transmitted vertically. It has been assumed that parasite-host interactions inevitably evolve toward lower virulence. This is contradicted by studies in which virulence is conserved or increases over tim ...
    Related: parasites, virulence, higher level, life cycle, virus
  • Parasites And Their Virulence - 1,258 words
    ... d eventual collapse (Georgi and Georgi 1990). Host immobility increases the opportunities for female mosquitoes to find and feed upon hosts (Read and Harvey 1993). Infected dogs have large numbers of D. immitis microfilaria in their circulatory systems, again increasing the likelihood of ingestion by the insect. Many infected dogs eventually die from heartworm, but in the process the parasite has ensured transmission. Similar debilitating effects have been observed in tapeworm-stickleback interaction; infected sticklebacks must swim nearer the water's surface due to an increased rate of oxygen consumption caused by the parasite (Keymer and Read 1991). Parasitized sticklebacks are more li ...
    Related: parasites, virulence, over time, arms race, evolution
  • A Parasite Is Defined As An Organism That Lives In Or On Another Organism, Called A Host 2 If The Parasite Has The Capacity T - 1,538 words
    A parasite is defined as an organism that lives in or on another organism, called a host (2). If the parasite has the capacity to cause disease in the host then the parasite is called a pathogen. Disease in the host is caused by the infection of the parasite. The interaction between the host and parasite is complex. Both the pathogen and the host strive for survival in some of the cases. The pathogen divides within or on the host in an attempt to keep its species alive while the hosts defense mechanisms simultaneously attempt to eliminate the pathogen. The extent of the battle for survival varies depending on the relationship. This paper discusses the disease state of Chlamydia; how the orga ...
    Related: capacity, host, organism, parasite, upper saddle
  • Adolf Hitler - 1,870 words
    Adolf Hitler For the past week I have been researching three men, Joseph Stalin, Mao, and Adolf Hitler for an answer to a question; who is the most evil? Which, means that I had to think about what exactly was evil for me. Now the dictionary they have a simple definition for it, which is: morally reprehensible, sinful, wicked. But there could be so many different meanings, because there are many different people in the world. So, these three men were judged on my definition of evil. Evil to me is someone who consciously knows what there doing but still doesnt care, someone who purposely tries to cause destruction on other people, one who possibly thinks that they are somewhat of a messiah, a ...
    Related: adolf, adolf hitler, hitler, vienna hitler, right to vote
  • Affirmative Action - 1,727 words
    Affirmative Action Jean Miller #43252 American Heritage 100 7:00 am - 7:50 am M, W, F Brother J. Baker Affirmative Action Affirmative action is a growing argument among our society. It is multifaceted and very often defined vaguely. Some can define affirmative action as the ability to strive for equality and inclusiveness. Others might see it as a quota-based system for different minority groups. Affirmative action was originally designed to help minorities (Gross, 1996). Is affirmative action fair? Are minority groups on equal footing? Is gaining employment for minorities difficult? Is education easily obtained for the minority groups of people? Affirmative action endeavors to answer all th ...
    Related: affirmative, affirmative action, working women, equal opportunity, frequent
  • Aids - 1,103 words
    Aids Aids Acquired Immune Deficiency Syndrome (AIDS), suppresses the immune system related to infection with the human immunodeficiency virus (HIV). A person infected with HIV gradually loses immune function along with certain immune cells called CD4 T-lymphocytes or CD4 T-cells, causing the infected person to become vulnerable to pneumonia, fungus infections, and other common ailments. With the loss of immune function, a clinical syndrome (a group of various illnesses that together characterize a disease) develops over time and eventually results in death due to opportunistic infections (infections by organisms that do not normally cause disease except in people whose immune systems have be ...
    Related: aids, deficiency syndrome, human immunodeficiency, acquired immune, bacterial
  • Aids In Detail - 2,125 words
    ... ne anonymous partner per year. Homosexual men have higher rates of sexually transmits diseases than heterosexual men and women because gay men tend to have larger numbers of different sexual partners, more often engage in furtive (anonymous) sexual activities, and more frequently have anal intercourse. PUZZLING SYMPTOMS Any theory of the new disease also had to account for a puzzling factor: the variety of symptoms seen in AIDS patients before they entered the final phase of complete susceptibility to opportunistic infections and cancers. Interviews with AIDS patients revealed many had been very sick for up to a year before they developed their first case of Pneumocystis pneumonia or sho ...
    Related: aids, life expectancy, men and women, hepatitis a, discovery
  • Animorphs - 546 words
    Animorphs One of my favorite books is Animorphs#7 The Stranger. It's about five kids who have the power to morph. In other words they can change into any animal they touch. By touch I mean they absorb a strand of the animal's DNA. Then, from the DNA, they are able to create an exact copy of the animal and take on the copy. They can change into any animal they touch. There is a series of these books. In this book they find an entrance to a Yeerk pool, a necessity of their alien enemies, the Yeerks. Once inside they creep around, as roaches, to see if they can pick up any information about the location of the Yeerks' Kandrona, a portable version of the Yeerks' home sun, which is also a necessi ...
    Related: human race, bear, pool, manage
  • Artificial Life - 644 words
    Artificial Life Artificial life (commonly called a-life) is the term applied collectively to attempts being made to develop mathematical models and computer simulations of the ways in which living organisms develop, grow, and evolve. Researchers in this burgeoning field hope to gain deeper insights into the nature of organic life as well as into the further possibilities of COMPUTER science and robotics (see ROBOT). A-life techniques are also being used to explore the origins and chemical processes of metabolism. Some investigators have even proposed that some digital "life" in computers might already be considered a real life form. Background The term artificial life was coined in the 1980s ...
    Related: artificial, artificial life, life research, real life, computer graphics
  • Ayn Rands The Fountainhead - 1,385 words
    ... t condone aspiring changes. Gail Wynand's falter is due to carelessness in maintaining his integrity. His business etiquette involves sacrificing himself and dedicating his whole life's work as a service to the people, for the people. He suppresses the outcries of his conscience, acting only on the behalf of strengthening public relations and obtaining higher profits. The man owns his fortune, but he did not own himself. The public mob lay claim to his existence. His fortune is a mere donation from the public in return for the service that he provides them. Wynand suffers internal pain, a pain unbearable due to disappointment and a sour appointment with reality. He dare challenges the pu ...
    Related: ayn rand, fountainhead, the fountainhead, book reports, human beings
  • Bacteria Outline - 1,338 words
    Bacteria Outline Bacteria - Oldest, structurally simplest, most abundant forms of life - Only organism with prokaryotic cellular organization - The only members of the kingdom Monera (4800 different kinds) - Characteristics change depending on growth conditions - Maintenance of life depends on them - play vital role of productivity and as decomposers - Capable of fixing atmospheric N for use by other organisms - Used in production and fermentation of various food and as antibiotics and is being tested for insect control - Prokaryotes vs. Eukaryotes - Multi-cellularity - All bacteria fundamentally single celled - Sometimes cells adhere within a matrix to form filaments - Activities of bacteri ...
    Related: bacteria, outline, food poisoning, flowering plants, acid
  • Biological Viruses: All Time Enemies - 1,170 words
    Biological Viruses: All Time Enemies First came fever. Then Hamid Mansaray, a young nurse's aide at a remote African hospital, began to hemorrhage. Blood erupted from his nose and mouth. It burst out of capillaries beneath his skin and eyes. By the time I reached the village of Panguma in Serria Leone, Mansaray lay isolated in a special ward. Doctors had diagnosed an obscure illness called Lassa fever. Its cause was a virus, an infective agent so small that 100,000 of them clumped together would still scarcely be visible. Viruses are little more than bundles of genes - strands of DNA or RNA, the molecules that carry the blueprints for all life. Yet viruses are far from simple. They invade ar ...
    Related: biological, white blood cells, yellow fever, common cold, contracts
  • Canadian Birds - 1,613 words
    ... vy wind is wiffeling, to do this the goose turns its body sideways so that it's wings are perpendicular to the ground, the bird loses it's left and basically falls out of the sky, this technique is known to glider pilots as side slipping because you slip out of the sky (Breen). Most people believe that the migration north and the migration south are the same but actually they are different (Breen). The migration north to the breeding grounds is a slower and more relaxed one than that of the one moving south (Wormer). The migration north sometimes begins in late January for Canada Geese that are wintering far south, but the majority of movement occurs in March (Resource Reader). The femal ...
    Related: canadian, good food, most dangerous, animal science, agricultural
  • Cancer Treatment - 1,837 words
    Cancer Treatment There are many ways to treat cancer. In fact, when you enter "cancer treatments" into any web browser you will find millions of web sites on how to treat cancer. Some examples of these treatments are chemotherapy, oxygen therapy, vitamin D therapy, food therapy, immunotherapy, and many others. Certain types of therapies go with certain types of cancers. For example, vitamin D therapy goes with breast cancer and immunotherapy goes with colon cancer. Cancer has taken the lives of millions of people and I believe it is important to inform people of what treatments are circulating in the medical profession. The human genome project's goal is to map and sequence the tens of thous ...
    Related: brain cancer, breast cancer, cancer, cancer prevention, cancer treatment, colon cancer, lung cancer
  • Do Viruses Help - 586 words
    Do Viruses Help? HOW ABOUT VIRUSES? Just like bacteria viruses are one of the microbes that are winning the match against the humans. Viruses were the toughest one to tackle for the scientist. The shape, contents and their protective shields were the most challenging part of the fight. There are many ways one can treat cancer, but for AIDS doctors prescribe a cocktail of drugs in which some are enzyme inhibitors, protein inhibitors and while some are RNA inhibitors. This is not it in the cocktail there is more to the list. As the technology increases and the knowledge of our scientist about the DNA, RNA, Viruses, Bacteria, and other interesting things we are a step closer to the destruction ...
    Related: viruses, life support, herpes simplex, cell division, pharmaceutical
  • Drug Abuse In The United States Of America, We, The People Value Several Things, Some Of Which Are Freedom, Expanding And Tak - 566 words
    DRUG ABUSE in the United States of America, we, the people value several things, some of which are freedom, expanding and taking care of our families and our financial security. We, the people, take such things for granted. We also discourage some behavior, such as crime, laziness and use of illegal drugs. Drug abuse is one of the most discouraged behaviors in our country. Use of illegal drugs is harmful to the user and all those with whom the user comes in contact. There are over 40 million illegal drug users in the world today and America is the biggest market for drugs. There are more drug dealers in this country, than there are dentists. Illegal drug abuse must be stopped; it hurts our s ...
    Related: abuse, drug abuse, expanding, illegal drug, united states of america
  • Entomology - 318 words
    Entomology Entomology is the study of insects, involving their biology and control in relation to their environment and to man. Entomology also had an independent scientific discipline which had roots in biology. Some entomologists are involved in reducing harmful species of insects that destroy food, housing, plants, and clothing and cause discomfort and disease to humans, livestock and household pets. Others develop ways to increase growth rate and spread the insects that provide food, pollinate crops, assist in destroying harmful insects, or are eaten as food by birds and fish. Entomologists primarily work in areas of research, college instruction, medical entomology, extension entomology ...
    Related: entomology, research assistant, applied research, growth rate, assistant
  • Evolution - 1,034 words
    Evolution Theory This short report will give you a short summary on evolution and how it my affect us, or even surroundings. Also, how it my affect our food chain and if one thing would die how the other would suffer because of that, for an example if you had snakes and birds and if snakes were to die birds population would drop. Why, because birds feed on snakes. Now a part of the food chain contains something called "niche" now you are asking what that is, so I guess that I will answer that question, it basically what the organism will do in the food chain. A food chain is how in the worlds animals, people, parasites, and insects get all of their food ,and what predators will eat them.. Pl ...
    Related: evolution, evolution theory, theory of evolution, genetic mutation, food supply
  • Explorting Masculine And Feminie Roles - 2,356 words
    Explorting Masculine And Feminie Roles EXPLORING THE MASCULINE AND FEMININE IN ISABEL ALLENDE'S THE HOUSE OF THE SPIRITS By Jodi Denny Old Dominion University Copyright (c) 1997 Jodi Denny This document may not be reprinted without the permission of the author. For permission, contact: Isabel Allende's novel The House of the Spirits is woven with dichotomy. Opposing forces are juxtaposed: rich and poor, good and evil, political left and right, birth and death, and the forces that will be explored in this paper, the masculine and feminine. The masculine and feminine are equal in importance to the world of the novel, indeed, the existence of one depends on the existence of the other. The dang ...
    Related: masculine, good and evil, poor people, salvador allende, shelter
  • Genetics Engineering - 1,437 words
    ... nbound probe, and placed over a piece of x-ray film. When developed, the film reveals the location of the radioactivity as a black spot. The corresponding colony on the original plate thus contains the bacteria carrying the required gene. The applications of genetic engineering are vast, probably the most well known is gene therapy in the medical world. It involves the introduction of a gene into somatic cells and enablement of its products to alleviate a disorder caused by the loss or malfunctioning of a vital gene product. Involving the latest DNA technology, it is the most rapidly advancing form of molecular medicine, which is concerned with the cause of disease at a molecular level. ...
    Related: engineering, genetic engineering, genetics, human genetics, recombinant dna
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