... 200nm and therefore features beyond this would be indistinguishable. Electron microscopes have shorter wavelengths, but a light microscope is more appropriate for observing whole blood cells. Good contrast is essential for the comparison between areas of the specimen, such as light areas vs. dark areas. A problem that ... size varied. The platelets had no observable nuclei but detail was limited due to their small size. Discussion As the observations show, blood consists of a variety of cells. These cells are suspended in an aqueous solution called plasma, which contains proteins and ino...

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... ." A new infection is now threatening the United States. It is called Cheagas, and it is popular in South America. Cheagas is a parasite infection that is getting spread by blood transfusions. There is no effective treatment or vaccine for Cheagas. It was named after a Brazilian doctor who described it in 1909, Carlos Cheagas. The original patient gets infected by a certain ... you when you are asleep, then it drops a some feces on the bite and the sleeping patient usually rubs the feces in the the bite. The feces gets into the blood stream and does its work. When you get infected by Ch...

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... membranes enclosing certain proteins. This capsule contains usually one or two strands of either RNA (Ribonucleic Acid) or DNA (Deoxyribonucleic Acid). DNA and RNA are long molecules, which contain genetic codes or information. This is distinguishing feature of viruses in comparison to the host, which has both DNA and RNA. The virus exists for one purpose - to duplicate. For my project ... , muscle pain, headache and sore throat. This is quickly followed by more severe symptoms including vomiting, diarrhea, rash, decreased kidney and liver functioning, and internal and external bleeding....

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... to the DNA of developing cells in the bone marrow. The effects are: 1) the uncontrolled, exaggerated growth and accumulation of cells called "leukemic blasts" which fail to function as normal blood cells and 2) the blockade of the production of normal marrow cells, leading to a deficiency of red cells (anemia), and platelets (thrombocytopenia) and normal white cells (especially neutrophils, i.e., neutropenia) in the ... in the marrow at the time of diagnosis the leukemia is referred to as "myeloblastic" type. If there are many myeloblasts but there are some cells developing towards full...

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... to the scene. B lymphocytes, or B cells, serve as the body's antibody factories. Each antibody is targeted to recognize and bind to an antigen from a specific invader. When antibodies circulating through blood and body fluids encounter this invader, they mark it for destruction. T lymphocytes, or T cells, are part of the cellular immune response. Some T cells, like CD4+ T cells (also called "helper" ... and men is a lung infection called Pneumocystis carinii pneumonia , abbreviated PCP. Other AIDS-defining conditions include severe body wasting and Candida infection of the esophagus, w...

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... placenta in about five minutes, with no pain, anesthesia, or patient risk. There are two types of cells used in stem cell transplantation. Haemopoietic stem cells come from umbilical cord blood. Bone marrow stem cells are known as autologous. Stem cell transplants are necessary after a patient has undergone a radical treatment such as chemotherapy. While these treatments destroy unhealthy cancerous cells, ... they also destroy otherwise healthy cells that are needed to maintain a strong immune system. Stem cells from cord blood transplants typically fail for one of two reasons. The first...

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... inhibits secretion of glucagons and insulin. Digestive enzymes are secreted by pancreas cells that surround the islets. see figure 41.3 After eating a meal, blood glucose levels increase, and within minutes, insulin is released from beta cells in the pancreas. The immediate effect (in seconds or minutes) of ... glucagons is released by alpha cells of the pancreas in response. Causes and consequences of abnormal glucose homeostasis Too much insulin reduces blood sugar, and serious effects or generally related to brain damage, as this organ uses glucose almost exclusively as an energy sour...

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... the first thing you think about when you hear the word AIDS? Most people think of a deadly virus that is transmitted by sex, needles, or blood transfusions. Then there are those who believe that one can get AIDS by hugging someone. Many of these people don't realize the severity of this ... The AIDS virus damages your CD4+ cells, also known as T-helper cells. A healthy person has between 500 and 1,500 CD4+ cells in one milliliter of blood, History of AIDS 4 however, a person with AIDS or the HIV virus has a lot less, around 200 T-helper cells. These cells are important because they ... v...

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... transmission between heterosexual men and women, however, has increased. When individuals using heroin or other injected drugs share needles contaminated with infected blood, direct contact with HIV occurs. In Eastern Europe, the sharing of contaminated needles among drug users is the most common cause of ... 1983, a variety of tests have been developed that help diagnose HIV infection and determine how far it has progressed. Other tests screen donated blood, blood products, and body organs for the presence of HIV. ` Doctors determine if HIV is present by identifying HIV antibodies. Ant...

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... illness that most people get within 6-12 weeks after becoming infected. It usually goes away without treatment. From this point on the person's blood tests positively for HIV. The second stage is symptomatic HIV infection. This is when the infected person's symptoms show up. It can last anywhere ... he or she can get tested. HIV tests determine the presence of antibodies to the AIDS virus. Antibodies are proteins produced by certain white blood cells to react with specific viruses, bacteria, or foreign substances that go into the body. The presence of antibodies to HIV indicates infectio...

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... breathing in (inspiration), the diaphragm moves inferiorly-this causes a decrease in pressure in the thoracic cavity and an increase in pressure in the abdominal cavity; resulting in a greater volume of blood moving from the compressed abdominal veins into the decompressed thoracic veins. When the pressures reverse during expiration (breathing out), the valves in the veins prevent back-flow. What is meant ... on your left foot and back to the heart again. Be sure to also indication which veins return the blood to the heart. The drop of blood's journey to the left big toe starts from the...

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... 20 % or more immature cells in the bone marrow. Myelodysplastic Syndrome is a condition where the bone marrow does not function normally. This causes the body to not produce enough normal blood cells. The most common blood cells affected are white blood cells, red blood cells and platelets. Some cases of MDS over time, progress to acute leukemia. Chronic leukemia involves an overgrowth of mature ... stem cell transplants and bone marrow transplants. A stem cell transplant begins with intensive chemotherapy or radiation therapy. The therapy is given at levels that destroy the abnormal ce...

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... countries which include places where over two percent of the population is infected with Hepatitis B. (Hepatitis B Foundation Information, 2). Hepatitis B is caused by a virus and can be passed through blood, other bodily fluids, and contaminated needles. This can happen during sexual contact, sharing intravenous drug needles and cocaine tubes, sharing personal hygiene tools such as razors, toothbrushes, or nail clippers ... recipient of the transfusion. (Web MD, 1,2). The Hepatitis B immunization vaccine is also available for those people in high risks groups. The early Hepatitis B vacci...

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... we cannot do anything to protect us but, we can prevent ourselves from AIDS. AIDS, which can't be cured spreads by the most common three ways: blood transfusion, sexual intercourse, and by mother to child. Blood transfusion is the most dangerous way because it is sure to get HIV. We must be so careful in health controls or in operations because there ... . As stated in "Your Medical Source Encyclopedia", "HIV frequently is spread among users of illegal drugs that are injected. This happens when needles or syringes contaminated with minute quantities of blood of someone infected with the ...

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... attacking against and destroying the T-cells, the quicker the T-cells will drop to the point where you contract AIDS. The HIV virus is transmitted mainly through blood or body fluids such as semen and vaginal fluids, which is where this virus is held. It is a sexually transmitted disease, which means that it ... has had numerous sex partners.) You should also never share razors, drug needles or anything else that may have been in contact with another person's blood, semen or vaginal fluids, because it lives mainly in these fluids, and can be passed on through these objects, if they get ...

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... body's ability to fight disease. It is acquired, not inherited. (Gong p. 24) It caused by two groups called retroviruses. The groups infect white blood cells and helper cells that play significant roles in immune system. The virus attaches to cd4 molecules where HIV then enter the cell an inserts it own ... is having sex with an infected person. (Fertzer p.16) You can't get it from mosquito bites, coughing, or drinking behind someone who has HIV. Blood can come from flossing your teeth or from sores caused by gum disease. To infect someone the virus has to get past the body's defenses, ...

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... of puberty, after which it recedes and degenerates. During its active phase, the thymus is approximately 6 cm long and 2 - 3 cm wide. The T-lymphocytes, which make up 75% of the blood lymphocytes, are formed in the thymus. The T-lymphocytes are the carriers of the cellular immune system, example, the body's defense against mutated cells (tumors) exogenous cells (transplants) and virus and ... mycosis infections. The blood transports the T-lymphocytes to the secondary lymphatic organs (spleen, tonsils, lymph nodes), where they perform their tasks in the immune system. Most of the T-lymph...

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... or HIV if they were stuck with a needle or other sharp object that has touched the blood or bodily fluids of another person who has one of these infections. These infections can also spread if infected blood or bodily fluids touch mucous membranes or an open sore or cut. Mucous membranes are the ... early stage of infection. First your doctor tests to see if you have HIV infection. Your blood is tested with an ELISA (enzyme-linked immunosorbent assay) test. If this test is positive for HIV, your blood is tested again with the Western blot test. If both tests are positive, you are diagnos...

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... and the host becomes ill. The virus speads through the lymphatic system and lymphoid tissue becomes a reservior for HIV replication. As the disease progesses, viral particles enter the blood and results in infection of the body tissues where the virus began to replicate in microphages. Reproduction in these areas causes the microphages to burst, allowing the disease to spread ... enters the body. Transmission of HIV is very clear. Because a virus must have a host in order to survive, HIV is transfered person to person through infected body fluids. These include blood, cervicovaginal secr...

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... such as the widowed, divorced or separated. Cardio vascular disorder refers to illnesses caused by the narrowing of the arteries which supply the heart with blood. This process is known as atherosclerosis. It is caused by fatty materials being deposited on the walls of the arteries. A narrowing of the ... arteries reduces flow of oxygen carried in blood to the heart. Stress has been linked with CHD but there a lot of other factors too, such as, gender, age, smoking, diabetes ... decisions, low job satisfaction, monotonous and repetitive tasks and a lack of job security. A number of the...

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... the lungs, liver, stomach and intestines, and to the lymph nodes. (www.aidscience.com) They have not seen people getting these diseases in numerous years. Soon, it also affected hemophiliacs, blood recipients, prostitutes and their customers, and babies born from AIDS-infected women. When high-profile victims began to contract the virus, such as porn star John Holmes who died in ... phase of AIDS is called HIV, or Human Immunodeficiency Virus. In order for HIV to become full-blown AIDS, the infected body's T-cell count (number of a special type of white-blood cells that fight off diseas...

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... produce fatal outcomes in humans. For example, pigs harbour endogenous retroviruses that can infect human cells. Scientists have identified infectious viruses in the blood plasma of pigs. Also, the recipient's DNA could interact with viral DNA, to create new and even deadlier viruses (Windsor 23). The ... xenotransplantation the transplanted organ may cause hyper acute rejection severe, life-threatening rejection of the transplanted part and acute vascular rejection, an inflammation of blood vessels. Also, a pig's liver would probably not be able to carry out the countless functions of a ...

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... , or from an infected mother to her baby, either by childbirth or breast-feeding. Transmission through blood transfusions is very rare today, because of the extensive testing of the nation's blood supply. However, before testing was required, many people, especially hemophiliacs, received HIV through tainted blood. Also, only about thirty percent of the children born to HIV-positive mothers actually become infected themselves ... . The AIDS epidemic is expanding at a rapid rate. At first, HIV infection in the United States was concentrated in the homosexual community and in individuals wh...

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... the air. For one to contract HIV they must either have unprotected sex with someone who has the virus or have an open wound and some one with infected blood manages to come in contact with it. The disease AIDS is a very scary one indeed. If one does manage to get AIDS there is a 0% survival ... disease. The four ways in which we know this virus can be contracted is through blood, semen, vaginal secretions, and breast milk. In this day and age we don't need to worry so much about blood transfusion because now they test blood donors for AIDS or the virus causing AIDS, HIV. Just 15 years ago...

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... with AIDS are immune to the virus so everything about the virus hasn't been found out. Back in the day people used to get AIDS through blood transfusions in hospitals but now there's screenings and checks to make sure that it doesn't get through. But it also depends on where you live ... open wounds or sores. But it's not likely. (*) The Human Immunodeficiency Virus (HIV) is not spread easily. You can only get HIV if you get infected blood or sexual fluids into your system. Like I said earlier. You can't get it from mosquito bites, coughing or sneezing, sharing household items, or swimmi...

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