Read e-book online A dictionary of biology PDF

By Elizabeth Martin, Robert Hine

This significant revision of A Dictionary of Biology, together with over 1,500 new entries, is the main updated biology dictionary to be had. together with 4,000 transparent and concise entries, it covers all of the mostly encountered phrases and ideas in biology, biophysics, and biochemistry, in addition to phrases from drugs and palaeontology considering the hot advances in those fields. Conforming to the concepts of the Institute of Biology, either in its definition of phrases and approach of type, this magnificent dictionary bargains authoritative assurance of present parts of analysis resembling molecular biology, genetics (including genetic engineering), and biotechnology, and new components similar to foodstuff know-how, geomicrobiology, and glycobiology. it's the ideal reference resource for a person drawn to this dynamic box.

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G. carbonic acid) are only partially dissociated. See also buffer; pH scale. Compare base. acid-base balance The regulation of the concentrations of acids and bases in blood and other body fluids so that the *pH remains within a physiologically acceptable range. This is achieved by the presence of natural *buffer systems, such as the haemoglobin, bicarbonate ions, and carbonic acid in mammalian blood. By acting in conjunction, these effectively mop up excess acids and bases and therefore prevent any large shifts in blood pH.

However, the mode of action is unclear. algae (sing. alga) A group of unrelated simple organisms that contain chlorophyll (and can therefore carry out photosynthesis) and live in aquatic habitats and in moist situations on land. The algal body may be unicellular or multicellular (filamentous, ribbon-like, or platelike). Formerly regarded as plants, algae are now classified as members of the kingdom *Protoctista; they are assigned to separate phyla based primarily on the composition of the cell wall, the nature of the stored food reserves, and the other photosynthetic pigments present.

Agglutinogen Any of the antigens that are present on the outer surface of red blood cells (erythrocytes). There are more than 100 different agglutinogens and they form the basis for identifying the different *blood groups. Antibodies in the plasma, known as agglutinins, react with the agglutinogens in blood of an incompatible blood group (see agglutination). aggressin A toxic substance that is secreted by certain parasitic microorganisms and inhibits the natural defense mechanisms of a host organism.

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