tailieunhanh - A Dictionary of Genetics phần 5

Tham khảo tài liệu 'a dictionary of genetics phần 5', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 222 hyperplasia hyperplasia an increase in amount of tissue produced by an increase in the number of cells. Hyperplasia often accompanies the regeneration of a damaged organ. See hypertrophy. hyperploid referring to cells or individuals containing one or more chromosomes or chromosome segments in addition to the characteristic euploid number. hyperprolinemia a hereditary disease in man arising from a deficiency of the enzyme proline oxidase. hypersensitivity the characteristic of responding with clinical symptoms to allergens in amounts that are innocuous to most individuals. See allergy. hypertension an increased blood pressure. hyperthermophile a prokaryote that flourishes at very high temperatures. Some live under high pressures at great ocean depths and in the absence of sunshine. They grow in tectonically active rift zones around volcanic vents. Some live at temperatures as high as 113 C The group contains archaeons like Archaeoglobus fulgidus and Methanococcus jannaschii and bacteria like Thermotoga maritima see entry for each species . The species that have been placed closest to the trunk of the universal tree of life . are all hyperthermophiles and this suggests that the common ancestor of all prokaryotes may also have been a hyperthermophile. See extrem-ophiles plate tectonics undersea vent communities. hypertrophy an increase in the size of a tissue or organ because of the increased volume of the component cells. See hyperplasia. hypervariable hv sites amino acid positions within the variable region of an immunoglobulin light chain or heavy chain exhibiting great variation among antibodies of different specificity these noncontiguous sites are brought together in the active site where antigen is bound a paratope by complex folding of the polypeptide chain. See immunoglobulin. hyphae branched or unbranched filaments that together form the mycelium . of a fungus. A single filament is a hypha. hypo See fixing. hypochromic anemia See anemia. .