This study suggests that a relatively large percentage of PAes consist of aerobic organisms
. In contrast to other investigators, we have not found anaerobic organisms to be the predominant isolates in this type of infections.
The oxygen goes into the atmosphere as a gas which becomes the source of oxygen for all aerobic organisms
. If one extrapolates backwards, oxygen can exist only if photosynthesis occurs.
In these 87 isolates obtained from 72 culture positive samples, 65 were aerobic organisms
(75%) and 22 were obligate anaerobes (25%).
Studies of tadpole and adult frog microflora have shown more anaerobic organisms growing in culture than aerobic organisms
The lack of oxygen is the reason why the dominant organisms (phototrophic bacterioplankton and some ciliates) are anaerobic, although some aerobic organisms
that tolerate low concentrations of sulphide ions are present in the shallow aerobic layer at the top.
In aerobic organisms
, chlorophyll molecules, along with carotenoids, are usually bound to proteins that are integrated in the thylakoid membrane.
A biofilter, using aerobic organisms
, then devours and digests the waste, leaving nearly pure water.
can degrade only lightly chlorinated PCBs.
Previous studies typically show a polymicrobial infection with both anaerobic and aerobic organisms
present.[2,4,5] The most frequent anaerobic organisms are Bacteroides spp, particularly B fragilis.
Presently, aerobic organisms
are isolated slightly more frequently than anaerobic organisms.
Anaerobic bacteria are always associated with aerobic organisms
as mixed infection.
The MIT researchers found evidence that tiny aerobic organisms
may have evolved to survive on extremely low levels of the gas in these undersea oases.