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Search results 111 - 120 of 291 matching essays
- 111: AIDS: Is It A Modern Plague?
- ... are unseen to the naked eye, and are invincible. These invisible tyrants are microorganisms. Underdeveloped countries, technologically advanced countries, and those in between are at the mercy of these microorganisms, which come in many forms - viruses, bacteria, fungi and parasites. The most dangerous of these forms is the virus. Some viruses, such as the common flu, are considered to have a fairly detrimental capacity. The flu can incapacitate a human for several weeks with various symptoms such as bodily soreness, fever, bronchial complications, and even pneumonia ... various areas of the world. Although some of these strains cannot be detected using the current blood-screening methods, there is little risk of spread to North America because of the geographic isolation of these viruses. Even in the case of HIV-2, spread outside Africa is rare. Only 18 cases of HIV-2 have been documented in the United States, and transmission in these cases was linked directly to ...
- 112: Gene Therapy
- ... genes. To do this we have developed gene delivery vehicles called vectors, which encapsulate therapeutic genes for delivery to cells. Many of the vectors currently in use are based on attenuated or modified versions of viruses. Over billions of years of evolution, viruses have developed extraordinarily efficient ways of targeting cells and delivering genome, which unfortunately leads to disease. Our challenge is to remove the disease causing components of the virus and insert recombinant genes that will be therapeutic to the patient. The modified viruses cannot replicate in the patient, but do retain the ability to efficiently deliver genetic material. Another strategy is based on synthetic vectors in which complexes of DNA, proteins, or lipids are formed in particles ...
- 113: AIDS: Is it a Modern Plague?
- ... are unseen to the naked eye, and are invincible. These invisible tyrants are microorganisms. Underdeveloped countries, technologically advanced countries, and those in between are at the mercy of these microorganisms, which come in many forms - viruses, bacteria, fungi and parasites. The most dangerous of these forms is the virus. Some viruses, such as the common flu, are considered to have a fairly detrimental capacity. The flu can incapacitate a human for several weeks with various symptoms such as bodily soreness, fever, bronchial complications, and even pneumonia ... various areas of the world. Although some of these strains cannot be detected using the current blood-screening methods, there is little risk of spread to North America because of the geographic isolation of these viruses. Even in the case of HIV-2, spread outside Africa is rare. Only 18 cases of HIV-2 have been documented in the United States, and transmission in these cases was linked directly to ...
- 114: Linux Operating System
- ... security system. It is almost impossible to write a virus for Linux because it must be 30-40 MB. Also, it has firewall system to protect the network from hackers. This minimizes the number of viruses capable of affecting a Linux system. If we think about it, there are many viruses for Windows that can harm your system. Linux is a stable Operating System. You can kill an individual process that is not replying with kill command vs. shutting down your system in Windows. Linux has ... s Mirc, Pirch or ICQ from the Internet. It is more secure to chat on Linux than Windows. You cannot be banned or nuked on Linux because there is a firewall in Linux and the viruses like Trojan, that can harm your Windows system are not effective on Linux. (Linux.com) (Linux.org) There are also features for administrators. A Linux system can be used as a WEB, FTP, or ...
- 115: Genetically Engineered Foods
- ... can cut and join strands of DNA. Using such enzymes, scientists learned to cut specific genes from DNA and to build customized DNA using these genes. They also learned about vectors, strands of DNA like viruses, which can infect a cell and insert themselves into its DNA. Scientists started to build vectors, which incorporated genes of their choosing and used vectors to insert these genes into the DNA of living organisms ... genes escaping and mixing with unmodified ones are unknown. ·Health Hazards There are several differences between the normal breeding process and the artificial genetic manipulation process. One key difference is the use of highly infectious viruses for artificial genetic manipulation as a promoter to witch on the introduced gene. Some of the viruses used are highly infectious. Genetic manipulation can increase the risk that the plant will develop toxic or allergy-causing compounds. Another possibility is that regulate exposure to foreign DNA and RNA material inserted into ...
- 116: AIDS: US Made?
- ... Bethesda Cancer Research Center published their discovery of the same virus, which is cytotoxic. (poisonous to cells) The Segals discuss the findings of Gonda et al, who compared the HIV, visna and other closely-related viruses and found that the visna virus is the most similar to HIV. The two were, in fact, 60% identical in 1986. According to findings of the Hahn group, the mutation rate of the HIV virus was about a million times higher than that of similar viruses, and that on the average a 10% alteration took place every two years. That would mean that in 1984, the difference between HIV and visna would have been only 30%, in 1982- 20%, 10% in 1980 and zero in 1978. "This means," say the Segals, "that at this time visna viruses changed into HIV, receiving at the same time the ability to become parasites in human T4-cells and the high genetic instability that is not known in other retroviruses. This is also consistent with ...
- 117: Book Report: The Hot Zone by Richard Preston
- ... wasn't Zaire, ! but a new strain of Ebola, which they named Ebola Reston. This was added to the list of strains: Ebola Zaire, Ebola Sudan, and now, Reston. These are all level-four hot viruses. That means there are no vaccines and there are no cures for these killers. In 1976 Ebola climbed out of its primordial hiding place in the jungles of Africa, and in two outbreaks in Zaire ... compassionately and admiringly of the doctors, virologists and epidemiologists who are the real-life Indiana Jones' of the virus trail. Some like Dr. Joe McCormick, Karl Johnson, and CJ Peters spent years tracking down deadly viruses in the jungles of South America and Africa, some narrowly escaping death. Their work is filled with courage, brilliance and sometimes petty rivalries. Others, like Dr. Nancy Jaax have lived rather conventional lives, aside from the fact that they don a space suit and work with highly lethal viruses on a regular basis. Preston has written a fast-paced and fascinating novel of medical panic. His gripping narrative is filled with horrifying and gore-filled descriptions and tension-building plot turns. From depictions ...
- 118: The Hot Zone
- ... wasn't Zaire, but a new strain of Ebola, which they named Ebola Reston. This was added to the list of strains: Ebola Zaire, Ebola Sudan, and now, Reston. These are all level-four hot viruses. That means there are no vaccines and there are no cures for these killers. In 1976 Ebola climbed out of its primordial hiding place in the jungles of Africa, and in two outbreaks in Zaire ... compassionately and admiringly of the doctors, virologists and epidemiologists who are the real-life Indiana Jones' of the virus trail. Some like Dr. Joe McCormick, Karl Johnson, and CJ Peters spent years tracking down deadly viruses in the jungles of South America and Africa, some narrowly escaping death. Their work is filled with courage, brilliance and sometimes petty rivalries. Others, like Dr. Nancy Jaax have lived rather conventional lives, aside from the fact that they don a space suit and work with highly lethal viruses on a regular basis. Preston has written a fast-paced and fascinating novel of medical panic. His gripping narrative is filled with horrifying and gore-filled descriptions and tension-building plot turns. From depictions ...
- 119: Polio
- ... Immunity to one strain does not furnish protection against the other two. Poliomyelitis control was made possible when, in 1949, the American bacteriologist John Franklin Enders and his coworkers discovered a method of growing the viruses on tissue in the laboratory. Applying this technique, the American physician and epidemiologist Jonas Salk developed a vaccine prepared from inactivated poliomyelitis viruses of the three known types. After field trials in 1954 the vaccine was pronounced safe and effective, and mass inoculation began. The American virologist Albert Sabin subsequently developed a vaccine containing attenuated, live polio virus ...
- 120: Ebola Virus
- ... Ebola is a relentless killer. Ebola isn't publicized very much so it seems to be a wise topic to explore. This way others may be informed of one of the world's most powerful viruses. The purpose of this paper is to further educate all those interested in the powerful effects of the Ebola virus in its many forms. I. Introductory Statement II. History III. Variations IV. Prevention V. Transmission ... to deal with problems like overpopulation and poverty, we may end up looking back nostalgically on the late twentieth century as a time of health and tranquility. As we show you, in the world of viruses, we are the invaders (Baddorf, Ourworld.compuserve.com)." Between the years of 425BC-430BC Athens' population was dramatically reduced when about 300,00 of its inhabitants died from some sickness. Some people now believe that ...
Search results 111 - 120 of 291 matching essays
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