Anaerobiosis


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anaerobiosis

[‚an·ə‚rō′bī·ə·səs]
(biology)
A mode of life carried on in the absence of molecular oxygen.

Anaerobiosis

 

(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.

References in periodicals archive ?
It also provides good yield of growth as inoculation and anaerobiosis is initiated at collection point.
1 w/v) y cultivos diluidos a 1 ml, con shock termico preliminar a 90[degrees]C por 5 minutos, en placas de Petri con agar SPS con el metodo de profundidad; e incubados a 35 [+ or -] 2[degrees]C por 72 horas en anaerobiosis.
2006), se incubaron en condiciones de anaerobiosis durante 7 dias con el fin de obtener 3,5 g de la bacteria.
El grado de anaerobiosis es proporcional a la profundidad y severidad del choque hemorragico, el cual se refleja en el deficit de bases y el nivel de lactato.
Soils and litter were incubated for 24 h in anaerobiosis to ensure total transformation of the nitrate into [N.
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.
Son incapaces de fermentar azucares, no requieren vitaminas, oligoelementos o electrolitos, utiliza metionina como fuente de azufre, cistina o cisteina, muchos aminoacidos principalmente el triptofano y sales de amonio, pueden crecer en condiciones de aerobiosismicroaerofiliay anaerobiosis (4).
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.
2012) [39], los diferentes tipos de disturbio que afectan los suelos, incluida la quema, pueden crear condiciones adversas como la anaerobiosis, compactacion del suelo y ausencia de cobertura vegetal que son caracteristicas que pueden reducir la biodiversidad y la actividad de los microorganismos fijadores de nitrogeno; ademas, el desarrollo de comunidades de FBN que usan el malato como fuente de C resulta ser mas compleja ya que dicho sustrato no es tan abundante como la glucosa en los suelos, que se encuentra haciendo parte del material vegetal.
1] bajo anaerobiosis en cajas de petri y mediante la tecnica del tubo rolado de Hungate.
Anaerobiosis in the soil upon submergence results in the reduction of inorganic compounds and favors mineralization of organic matter through methanogenic fermentation.