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Search results 101 - 110 of 291 matching essays
- 101: DNA
- ... Colin M. MacLeod, and Maclyn McCarty concluded that DNA was the basic genetic component of chromosomes. Later, RNA would be proven to regulate protein synthesis. (Miller, 139) DNA is the genetic material found in most viruses and in all cellular organisms. Some viruses do not have DNA, but contain RNA instead. Depending on the organism, most DNA is found within a single chromosome like bacteria, or in several chromosomes like most other living things. (Heath, 110) DNA can ... helix molecule. (Heath, 119) (Miller, 144-145) As mentioned before, DNA molecules are involved in a process called protein synthesis. Without RNA, this process could not be completed. RNA is the genetic material of some viruses. RNA molecules are like DNA. They have a long chain of macromolecules made up of nucleotides. Each RNA nucleotide is also made up of three basic parts. There is a sugar called ribose, and ...
- 102: Cancer
- ... steps to safe guard workers against exposure to them. Carcinogens consist of humanmade and natural chemicals found in small quantities in the air, water, food, and the work place. It has been difficult proving that viruses are the cause of cancer. So viruses don’t play a big role in causing cancer, yet. Some doctors believe that a tendency to develop certain types of cancer may be inherited. The skin is greatly effected the sun. The ultraviolet radiation ... Vol 3, Enterprises Education Corporation, 1986 I. Introduction A. History B. What Is Cancer C. Types Of Cancer II. How Cancer is Diagnosed III. Seven warning Signs IV. Possible Causes Of Cancer A. Environment B. Viruses C. Haereditatis D. The Sun E. The Air V. Treatments A. Surgery B. Radiation C. Chemotherapy VI. Prevention A. Primary B. Secondary
- 103: Ebola: A Contagious Trend
- ... action to isolate the virus before it spreads and harms millions of people. This is the scientists’ primary goal when faced with this disease. The Ebola virus belongs to a group of “negative-stranded RNA viruses.” To date, there are five different recorded cases of the Ebola strand. Ebola Zaire, Sudan, Reston and Tai. Though all have been known to cause serious internal damage to all types of organs, whether it is human or animal, Ebola Reston does not seem pose a threat to humans in any way. “Ebola viruses are spread though direct contact with a person who is very ill with the disease. Usually wide-spread action of the virus takes place among hospital care workers or family members who were aiding an ... origin. The outbreaks of 1976 and 1979 left no evidence to what might have been carrying the Ebola before it was passed onto humans. To this date, no clues have been uncovered about where the viruses originally came from. Ebola Tai, found in 1995, only gave scientists more questions and set them back even further. It was found on November of 1995 by a Swiss researcher in Ivory Coast, West ...
- 104: Disease In Africa
- ... in the sense that more diverse forms of life share this kind of habitat than occupy drier, cooler regions."(McNeill,16) Africa possesses the prefect breeding ground for many diseases. There were many diseases and viruses that have had an impact on Africa, however trypanosomiasis, malaria, yellow fever, AIDS, smallpox, onchocerciasis and yaws were the most destructive. African trypanosomiasis is a destructive disease that is often called "the sleeping sickness." It ... to person. "Early hunting and gathering peoples had millenia to achieve biological harmony with their microbal and helminthic parasite. Infection conveys long-lasting immunity against that specific viral strain to the survivors, and, since these viruses do not persist in a latent state in their hosts and have no animal reservoir, they can survive only by continual transfer from victims to nonimmune persons."(Hartwig & Patterson, 5) During the beginning years of ... in the sense that more diverse forms of life share this kind of habitat than occupy drier, cooler regions."(McNeill,16) Africa possesses the prefect breeding ground for many diseases. There were many diseases and viruses that have had an impact on Africa, however trypanosomiasis, malaria, yellow fever, AIDS, smallpox, onchocerciasis and yaws were the most destructive. African trypanosomiasis is a destructive disease that is often called "the sleeping sickness." ...
- 105: AIDS
- ... men. In 1983, French cancer specialist Luc Montagnier and scientists at the Pasteur Institute in Paris isolated what appeared to be a new human retrovirus—a special type of virus that reproduces differently from other viruses—from the lymph node of a man at risk for AIDS. Nearly simultaneously, scientists working in the laboratory of American research scientist Robert Gallo at the National Cancer Institute in Bethesda, Maryland, and a group ... Other distantly related strains of HIV-1 have been identified in various areas of the world. Although some of these strains cannot be detected with current blood-screening methods, there is little risk of these viruses spreading to the United States because of their geographic isolation. Even in the case of HIV-2, accumulate outside Africa is rare. Only 64 cases of HIV-2 have been documented in the United States ... blood banks, plasma centers, reference laboratories, private clinics, and health departments. Due to the major differences in the protein components of HIV-1 and HIV-2, separate tests were developed to detect these two related viruses. As new strains of HIV are identified from around the world, they will need to be evaluated for detection by these tests. The Centers for Disease Control and Prevention (CDC) in Atlanta, Georgia, has ...
- 106: Hacking
- ... 461 to read his homepage. I was shocked.......and I wondered how many little kids under 12 years old had been in there and got all sorts of ideas.....bad ideas. He had everything from viruses to download and other tips. He even had a "cookbook" that he called the infection connection. I never thought about hacking and phreaking all too much until now. Sure, kids give ea. other little viruses for kicks, but when you can break passwords and break security grounds, that is getting out of hand. I think that it is all just a wanting to know. He even concluded in a paragraph ... that it was mind boggling. I didn't want to look at it, because it was really is intriguing..interesting. But I finally concluded that I was actually scared. In those chatrooms, people can send viruses just like that. Mess up your whole netscape if you open the file that they send you. Even in this particular guy's homepage, he could have planted a virus so that when you ...
- 107: How to Maintain A Computer System
- ... makes disk operations faster. Defragmentation programs have been known to damage files so make sure your disk is backed up first. A good thing to do now would be to protect your system from computer viruses. Computer viruses are programs designed to infect computer systems by copying themselves into other computer files. The virus program spreads when the infected files are used by or copied to another system. Virus programs are dangerous because they are often designed to damage the files in a system. You can protect yourself from viruses by installing an anti-virus program. Lastly learn to use system diagnostic programs, if they did not come with your system, obtain a set. These programs help you identify and possibly solve problems before ...
- 108: 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 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 ...
- 109: The Immune System
- ... against diseases and other harmful invaders. The immune system provides protection against a variety of potentially damaging substances that can invade the body. These substances include disease-causing organisms, such as bacteria, fungi, parasites, and viruses. The body's ability to resist these invaders is called immunity. A key feature of the immune system is its ability to destroy foreign invaders while leaving the body's own healthy tissues alone. Sometimes ... autoimmune response or autoimmunity. The immune system is composed of many parts that work together to fight infections when pathogens or poisons invade the human body. Pathogens are disease-causing organisms such as bacteria and viruses. The immune system reacts to foreign substances through a series of steps know as the immune response. Any agent perceived as foreign by a body's immune system is called an antigen. Several types of ... itself. Sometimes it needs help. Physicians give their patients vaccines to help protect them from certain severe, life-threatening infections. Vaccines and serums boost the body's ability to defend itself against particular types of viruses or bacteria.
- 110: Herpes-Simplex: Type 2
- ... is a name that is used to describe several types of skin eruptions that are characterized by formation of blisters. The term embraces primarily two distinct disorders, herpes simplex and herpes zoster, both caused by viruses. Together, these "herpes" viruses are estimated to cause more human illnesses than any other group of viruses. Two types of herpes simplex are known. The first causes cold sores or fever blisters, which is an eruption of blisters that often occurs during the course of or after one of a variety ...
Search results 101 - 110 of 291 matching essays