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6 天前 · cancer, group of more than 100 distinct diseases characterized by the uncontrolled growth of abnormal cells in the body. Though cancer has been known since antiquity, some of the most significant advances in scientists’ understanding of it have been made since the middle of the 20th century.
2024年5月22日 · Basic concepts and tools. Epidemiology is based on two fundamental assumptions. First, the occurrence of disease is not random (i.e., various factors influence the likelihood of developing disease). Second, the study of populations enables the identification of the causes and preventive factors associated with disease.
2024年5月21日 · Henrietta Lacks (born August 1, 1920, Roanoke, Virginia, U.S.—died October 4, 1951, Baltimore, Maryland) was an American woman whose cervical cancer cells were the source of the HeLa cell line, research on which contributed to numerous important scientific advances. Henrietta Lacks. Henrietta Lacks. After her mother died in childbirth in 1924 ...
3 天前 · The Black Death is widely believed to have been the result of plague, caused by infection with the bacterium Yersinia pestis. Modern genetic analyses indicate that the strain of Y. pestis introduced during the Black Death is ancestral to all extant circulating Y. pestis strains known to cause disease in humans.
2024年5月6日 · leprosy, chronic infectious disease that affects the skin, the peripheral nerves (nerves outside the brain and spinal cord ), and the mucous membranes of the nose, throat, and eyes. It is caused by the leprosy bacillus, Mycobacterium leprae.
2024年5月16日 · Recent News. health, in humans, the extent of an individual’s continuing physical, emotional, mental, and social ability to cope with his or her environment. This definition is just one of many that are possible. What constitutes “good” health in particular can vary widely. The rather fragile individual who stays “well” within the ...
2024年5月3日 · major histocompatibility complex (MHC), group of genes that code for proteins found on the surfaces of cells that help the immune system recognize foreign substances. MHC proteins are found in all higher vertebrates. In human beings the complex is also called the human leukocyte antigen (HLA) system. There are two major types of MHC protein ...
