Exact(1)
Methanobacterium, Aeromonas, and Methylobacterium are examples of strictly anaerobic, strictly facultative, and strictly aerobic genera with R = 1, R = 0, and R = −1, respectively.
Similar(59)
Strain MPT, the other organism isolated from the cathodic chamber of the same BER enrichment (Thrash et al. 2007), its closest relative, strain CR, and strain LT-1T were mesophilic, strictly respiratory, facultative anaerobes that were phylogenetically distinct from all other previously described DPRB.
NOXes catalyze a four-electron reduction of oxygen to water using reducing equivalents of NAD(P H, and their natural function is to detoxify O2 in several facultative or strictly anaerobic bacteria and parasitic protozoa.
and an increase in the number and diversity of facultative and strictly anaerobic bacteria [ 4– 6].
Even though we cannot unequivocally identify H2S as the single most important driving force shaping these protistan communities using this dataset, this observation is not unexpected: H2S-detoxification requires specific adaptation that is not necessarily present in all facultative or strictly anaerobic protists [ 51, 52].
Although some of them are not strictly essential and are considered facultative, they can be a key to host survival under specific environmental conditions, such as parasitoid attacks, climate changes, or insecticide pressures.
However, a null hypothesis is accepted when it comes to the number of enzymes (one tailed Wilcoxon rank-sum test p = 0.18), meaning that the significant difference in modularity between facultative bacteria and strictly aerobic bacteria is not a consequence of the difference in the numbers of the enzymes.
The bacterial populations involved were mainly identified as facultative anaerobes (Enterobacteriaceae) and strictly anaerobes (Clostridiales), and their dynamics in relation to H2 and metabolite production depends on the physical and environmental conditions of the bioreactor.
If environmental variability should explain the difference in modularity, the flexibility in oxygen usage, as one way of reflecting environmental variability, supports such explanation: facultative bacteria have higher modularity than strictly aerobic and strictly anaerobic bacteria.
Facultative mutualistic symbionts are not strictly necessary for their host.
However, denitrifiers, at least, are often facultative anaerobes that do not require strictly anoxic conditions for respiration of nitrate [51], and the isolation of bacterial strains capable of denitrification under aerobic conditions has been reported [52] [54].
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