facultative

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facultative

 [fak´ul-ta″tiv]
not obligatory; pertaining to or characterized by the ability to adjust to particular circumstances or to assume a particular role.

fac·ul·ta·tive

(fak'ŭl-tā'tiv),
Able to live under more than one specific set of environmental conditions; possessing an alternative pathway.

facultative

/fac·ul·ta·tive/ (fak´ul-ta″tiv) not obligatory; pertaining to the ability to adjust to particular circumstances or to assume a particular role.

facultative

(făk′əl-tā′tĭv)
adj.
1. Of or relating to a mental faculty.
2. Biology Capable of functioning under varying environmental conditions. Used of certain organisms, such as bacteria that can live with or without oxygen.

fac′ul·ta′tive·ly adv.

facultative

[fak′əltā′tiv]
Etymology: L, facultas, capability
not obligatory; having the ability to adapt to more than one condition, such as a facultative anaerobe. Compare obligate.

fac·ul·ta·tive

(fak'ŭl-tā'tiv)
In biology, able to live under more than one specific set of environmental conditions; possessing an alternative pathway.

facultative

1. Capable of adapting in response to changing environments. Used especially of micro-organisms that can grow either in an atmosphere of oxygen (aerobic) or in the absence of oxygen (anaerobic) or of those capable of living either as parasites or non-parasites.
2. Of organisms with a usual or preferred metabolic process, but which are capable, under unusual conditions, of adopting an alternative metabolic pathway.

facultative

(of an organism) being capable of adopting an alternative life style from the normal one. In this context, the word ‘facultative’ is followed by the unusual life style. Thus, a facultative PARASITE is one that is normally saprophytic but is occasionally parasitic; a facultative SAPROPHYTE is one that is normally parasitic but can become saprophytic; a facultative ANAEROBE is an organism such as yeast, that is normally aerobic but can exist in anaerobic conditions. Compare OBLIGATE.

fac·ul·ta·tive

(fak'ŭl-tā'tiv)
Able to live under more than one specific set of environmental conditions; possessing an alternative pathway.

facultative (fak´əltātiv),

adj pertaining to an organism's ability to survive under different or varying environmental conditions.

facultative

not obligatory; pertaining to or characterized by the ability to adjust to particular circumstances or to assume a particular role. See also accumulator plants.
References in periodicals archive ?
In diagnostic bacteriology, it is necessary to use several types of media for routine culture, particularly when the possible organisms are aerobic, facultatively anaerobic, and obligately.
cereus is an aerobic and facultatively anaerobic, spore-forming, Gram-positive bacillus.
alternata, is a ubiquitous, facultatively plant-pathogenic or saprobic species known to produce allergenic airborne conidial spores (Sanchez and Bush 2001).
Legionella pneumophila is considered a facultatively intracellular pathogen, surviving outside of a human host in environments such as water sources, perhaps within biofilms or by forming an association with amoeba.
Some species of bamboos are facultatively monocarpic, that is they may or may not die after blooming (Judziewicz et al.
1985: Reproductive strategy of a facultatively paedomorphic salamander Ambystoma talpoideum.
Isolation, characterization, and U (VI) reducing potencial of a facultatively anaerobic, acid-resistant bacterium from low-pH, nitrato-and U (VI)--contaminated subsurface sediment and description of Salmonella subterranea sp.
In one study, facultatively enteropathogenic organisms such as Klebsiella spp.
Its life cycle is facultatively heteroxenous: Felidae are definite hosts where the sexual reproduction of the parasite occurs with the formation of oocytes, which are eliminated via feces.
Facultatively semelparous individuals lie intermediate to obligately semelparous and iteroparous conditions and may provide excellent insights into the question of whether to invest in a single brood or to attempt a second.

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