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Search results 91 - 100 of 291 matching essays
- 91: Environmental And Genetic Affects And Schizophrenia
- ... billion according to Federal figures (American Pychological Association (APA), 1996). There are many theories about the aetiology of schizophrenia, but research has failed to pinpoint the origins. There is evidence that environmental pathogens (for example, viruses) are involved in the causation of schizophrenia. There is also evidence for a role of hereditary influences and obstetric complications on the incidence of schizophrenia. Furthermore, psychological influences have also been suggested as important in ... leaving the brain vulnerable in early adulthood, when the programmed elimination of redundant neuronal connections (called apoptosis) exposes this maldevelopment. As mentioned, a possible cause of the maldevelopment during pregnancy may be exposure to flu viruses. In a paper published in Scientific American (Beardsley, 1997) it was reported that "an unrecognised infection by a virus or other agent might trigger at least some cases of schizophrenia" (Beardsley, 1997, p.1). Support ... indicated that many of them posses anti-viral activity, according to Volkers: "thorazine has been shown to slow the progression of AIDs in HIV-infected patients, and lithium can inhibit the replication of herpes simplex viruses" (Volkers, 1997, p.1). Such findings support the theory that viral infections may play a role in schizophrenia. More specific evidence of viruses influencing the incidence of schizophrenia is the correlation between exposure to ...
- 92: Acquired Immune Difficiency Syndrome
- ... turned out to be a very unusual sort of virus. Its genetic material was not DNA, but RNA. When it infected human cells, it had its RNA direct the synthesis of viral DNA. While RNA viruses are not that uncommon, very few RNA viruses reproduce by setting up the flow of information from RNA to DNA. Such reverse or "retro" flow of information does not occur at all in any DNA virus or any other living things. Hence, the virus was said to belong to the rare group of virues called "Retro Viruses". Research provided the means to test donated blood for the presence of the antibodies to the virus, astronomically reducing the chance of ones getting AIDS from a blood transfusion. This was one of the ...
- 93: AIDS and You
- ... turned out to be a very unusual sort of virus. Its genetic material was not DNA, but RNA. When it infected human cells, it had its RNA direct the synthesis of viral DNA. While RNA viruses are not that uncommon, very few RNA viruses reproduce by setting up the flow of information from RNA to DNA. Such reverse or "retro" flow of information does not occur at all in any DNA virus or any other living things. Hence, the virus was said to belong to the rar group of virues called "Retro Viruses". Research provided the means to test donated blood for the presence of the antibodies to the virus, astronomically reducing the chance of ones getting AIDS from a blood transfusion. This was one of the ...
- 94: Schizophrenia
- ... certain drugs such as amphetamines can make psychotic symptoms worse if a person already has schizophrenia. Furthermore, these drugs can, in a sense, create schizophrenia. Other researchers that support the Environmental Theory believe that "slow viruses" may be to blame. Slow viruses are viral infections that go undetected for long periods of time. Signs and symptoms are delayed and may occur many years after the first infection. The Bio-Chemical Theory suggests that schizophrenia is caused by ... right-brained" while females have less specialization on either side of the brain. Yet another startling fact about schizophrenia is the amount of schizophrenics who are winter born. A scientific explanation for this is seasonal viruses, which may have infected the fetus but remain dormant or not as active until many years later. This fact was discovered as early as 1929 but was ignored for about forty years. By the ...
- 95: Mitosis In Cancerous Cells
- ... example, the Rous sarcoma virus has been shown to cause mammary gland (breast) cancer in mice. Epstein-Barr virus has long been known to cause a cancer called Burkitt's lymphoma. It may be that viruses may prove to cause a number of cancers that we have yet to understand. And yet viruses may themselves prove to be a major weapon in the fight against cancer, as laboratory genetically engineered viruses are designed that invade cancerous cells and fix or kill the cancer cell at the level of the genome. Chemical carcinogens function to convert normal cells to cancerous cells by inducing mutations in genes ...
- 96: Hot Zone
- ... human race on its home for the past millions of years, the rain forests. Are Ebola, and the other filoviruses, antibodies against the "human virus" that is swiftly and thoughtlessly destroying Mother Earth? Are these viruses the "check" on the human K-species that we have been expecting? For the most part, the characters of this book have the utmost respect for all Level 4 viruses, especially the greatly feared and most deadly Ebola Zaire (killing 90% of those infected). Handling viral samples, infected animals and blood samples as if they were nuclear weapons, that if detonated, would ultimately result in ... Gene Johnson, had been to Africa and treated patients suffering from Ebola in Sudan. He had spent days on end inside the blood-spattered huts, breathing the smell of warm blood, blood infested with Ebola viruses and was never, himself, infected. At one point, he had even been trying to give a woman a shot, and she convulsed, causing him to stick himself with a bloody needle. Lucky for him, ...
- 97: Ebola
- ... discovery, there have beenfour outbreaks of this disease. There are three known strains, ofvariations of ebola. There is no known cure for this disease(2).Ebola has become one of the most mysterious and feared viruses onthe face of this earth. Ebola's first documented appearance was in Zaire in 1976. Noone knows where ebola comes from or what the original host is.However, scientists know that man is not ebola ... the Army Medical Research Instituteof Infectious Diseases at Fort Detrick Md.,(6). Researchers have discovered the source of human infection for all level fourorganisms except ebola(7). This means that all organisns that cause deadly viruses have been contained and studied, and have had antibodies created to ward of the illnesses that are caused. Although Ebola is a mystery to humans, the virus is relatively hard to catch and it kills ... disease as humans. Scientists are hoping that they will make some substantial discoveries with this outbreak.(13). Scientists do know that ebola is a strand of seven proteins(14) that belongs to a family of viruses called filovirusus. The virus consists of a shell of proteinssurrounding genetic material. The virus attaches itself to a host cell, and changes the chemicals makeup to fit its own so that itcan reproduce(15). ...
- 98: All You Need To Know About AIDS
- ... turned out to be a very unusual sort of virus. Its genetic material was not DNA, but RNA. When it infected human cells, it had its RNA direct the synthesis of viral DNA. While RNA viruses are not that uncommon, very few RNA viruses reproduce by setting up the flow of information from RNA to DNA. Such reverse or "retro" flow of information does not occur at all in any DNA virus or any other living things. Hence, the virus was said to belong to the rare group of virues called "Retro Viruses". Research provided the means to test donated blood for the presence of the antibodies to the virus, astronomically reducing the chance of ones getting AIDS from a blood transfusion. This was one of the ...
- 99: Hepatitis
- ... by Ernst Ruska, the virus' true anatomy was first time visible to us in 1933.2 They are so infinitesimal that billions could fit into a drop of water---or a drop of human blood. Viruses have the most exquisite ability to sense the right cell surfaces. They don't just cause diseases in people, they infect every form of life on earth. Some emerging viruses are very serious. Common examples are the hepatitis viruses, B and C. The hepatitis B pattern of illness was recognized at the end of the nineteenth century, yet the virus itself was not isolated until 1963. One hundred and seventy six million people ...
- 100: Computer Fraud and Crimes
- ... prevalent issues facing every computer user. This ranges from system administrators to personal computer users who do work in the office or at home. Computers without any means of security are vulnerable to attacks from viruses, worms, and illegal computer hackers. If the proper steps are not taken, safe computing may become a thing of the past. Many security measures are being implemented to protect against illegalities. Companies are becoming more ... have three major weapons against computer crime. The first defense against computer crime is system security. This is the many layers systems have against attacks. When data comes into a system, it is scanned for viruses and safety. Whenever it passes one of these security layers, it is scanned again. The second resistance against viruses and corruption is computer law. This defines what is illegal in the computer world. In the early 1980's, prosecutors had problems trying suspect in computer crimes because there was no definition of illegal ...
Search results 91 - 100 of 291 matching essays
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