Phylum
Bacteroidetes
No unifying phenotypic feature characterises this
diverse group, but their phylogenetic closeness causes them to be placed
together. In light of this, we can only consider ex-amples, without claiming
them to be in any way representative.
The genus Flavobacterium
takes its name from the yellow carotenoid pigments se-creted by its members.
These are aerobic, free-living, aquatic forms, although they are also
associated with food spoilage.
In contrast, Bacteroides
species are obligate anaerobes found in the human gut, where they ferment
undigested food to acetate or lactate. Here they outnumber all other microbial
forms, and are responsible for a significant percentage of the weight of human
faeces. Some species can also be pathogenic, and may cause peritonitis in cases
where the large intestine or appendix has become perforated.
Representative genera: Bacteroides, Flavobacterium
Related Topics
Privacy Policy, Terms and Conditions, DMCA Policy and Compliant
Copyright © 2018-2024 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.