Moreover, the extent of the "facultative" divergence attainable by prisms shows a considerable latitude.
On the whole, perhaps, the "facultative" Referendum is to be preferred to the obligatory.
It is not normally parasitic, however, and hence will be considered with other facultative parasites in Chapter IV.
Many are exclusively parasitic or saprophytic, and many are facultative, both conditions of living being possible.
The minimum O pressure for facultative anarobes is also 0 mm.
It has been shown that if these organisms are grown with arobes or facultative anarobes they thrive at ordinary room temperature.
Thus arobes and facultative anarobes are prototrophic for O.
The existence of anarobic and facultative anarobic bacteria shows the fallacy of such beliefs.
I have seen this particularly in those cases where facultative divergence also was greater than usual.
If a parasite cannot exist outside animal tissues, it is an obligatory parasite; if it can, it is a facultative saphrophyte.
facultative fac·ul·ta·tive (fāk'əl-tā'tĭv)
Capable of functioning under varying environmental conditions. Used of certain organisms, such as bacteria that can live with or without oxygen.
Capable of occurring along various pathways or under various conditions.
Capable of existing under varying environmental conditions or by assuming various behaviors. Bacteria that are facultative aerobes can live in both aerobic and anaerobic environments. A facultative parasite can live independently of its usual host. Compare obligate.