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 Vitro Susceptibilities of Aerobic and Facultatively Anaerobic Gram-Negative Bacilli Isolated from Patients with Intra-Abdominal Infections Worldwide: 2004 Results from SMART (Study for Monitoring Antimicrobial Resistance Trends).
Only three of 16 male Indigo Buntings provisioned nestlings in our study, but studies of other facultatively polygynous species with reduced paternal care, including European Starlings (Sturnus vulgaris; Pinxten and Eens 1994), Red-winged Blackbirds (Agelaius phoeniceus; Muldal et al.
Inhibition of Neisseria gonorrhoeae by aerobic and facultatively anaerobic components of the endocervical flora: evidence for a protective effect against infection.
P multocida is an aerobic, facultatively anaerobic, Gramnegative coccobacillus that inhabits the oral cavity and the gastrointestinal tract of 70 to 90% of cats and 50 to 66% of dogs.
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.
In one study, facultatively enteropathogenic organisms such as Klebsiella spp.
What is more important is that the EPC cannot be used facultatively to convey affectedness of the possessor, even if the kinship term possessor's referent was in fact strongly affected by the cousin's death.
Wetland indicator species made up 45% (35 species) of the total species present (Table 1), most of which were facultatively (Reed 1988; USFW 1996) associated with wetland conditions.
Behavioral observations of captive fishes in low and high density groups indicated that spawning aggregation density may have a significant influence on the sex allocation of this facultatively protogynous hermaphrodite.

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