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A mode of life carried on in the absence of molecular oxygen.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(also anoxybiosis), life in the absence of free oxygen. Anaerobiosis is the usual condition of existence for the anaerobic organisms which obtain energy for vital activities from the decomposition of compound inorganic substances (for example, nitrates and sulfates) or organic substances (for example, carbohydrates).

The concept of anaerobiosis was introduced in 1861 by L. Pasteur, who showed that the microorganisms that cause lactic acid fermentation die in the presence of oxygen. In multicelled animals, anaerobiosis is often only a temporary state which provides for survival during periods when there is no oxygen, and it is accompanied by a sharp decline in metabolism and a transformation to an inactive state. Aerobic organisms also have anaerobic stages in the metabolic processes that are accompanied by the generation of energy. In the tissues of a majority of the multicelled animals, anaerobic carbohydrate conversion occurs chiefly by glycolysis. In rapidly growing embryonic cells and in tumor cells, anaerobic processes are more strongly expressed than in the normal cells of a healthy organism. The processes of anaerobic conversion (fermentation and putrefaction) are of great significance in the circulation of matter in nature.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Improved isolation of anaerobic bacteria from the mouse cecum by maintaining continuous strict anaerobiosis. Proc Soc Exptl Biol Med 1967;124: 903-9.
El material vegetal fue almacenado y compactado en silos experimentales para garantizar adecuadas condiciones de anaerobiosis y fermentacion.
corrodens fueron suspendidas en caldo ToddHewitt (Jaramillo et al., 2006), se incubaron en condiciones de anaerobiosis durante 7 dias con el fin de obtener 3,5 g de la bacteria.
The LysR-type virulence activator AphB regulates the expression of genes in Vibrio cholerae in response to low pH and anaerobiosis. Journal of Bacteriology 192, 4181-4191.
Cultivation was carried out using the pour-plate technique, and the plates were incubated, under anaerobiosis, for 72 hours at 37[degrees]C for B.
Soils and litter were incubated for 24 h in anaerobiosis to ensure total transformation of the nitrate into [N.sub.2]O.
Caracteristicas fenotipicas.--La cepa J8A2 presenta las siguientes caracteristicas fenotipicas a 28 [grados]C: bacilo corto Gram negativo (24 horas en agar TSA), motil, utiliza citrato como unica fuente carbono, no hidroliza almidon, produccion de indol negativo, sin produccion de [H.sub.2]S, fermentacion de glucosa con produccion de acidez y gas, crecimiento en anaerobiosis, crecimiento en NaCl al 7%, rojo de metilo positivo y Voges-Proskauer negativo.