News

Environmental controls on bacteriohopanepolyol profiles of benthic microbial mats from Lake Fryxell, Antarctica

Abstract.

"Bacteriohopanepolyols (BHPs) are pentacyclic triterpenoid lipids that contribute to the structural integrity and physiology of some bacteria. Because some BHPs originate from specific classes of bacteria, BHPs have potential as taxonomically and environmentally diagnostic biomarkers. For example, a stereoisomer of bacteriohopanetetrol (informally BHT II) has been associated with anaerobic ammonium oxidation (anammox) bacteria and suboxic to anoxic marine environments where anammox is active. [...]"

Source: geobiology
Authors: Emily D. Matys et al.
DOI: 10.1111/gbi.12353

Read the full article here.


Bacterial fermentation and respiration processes are uncoupled in anoxic permeable sediments

Abstract.

"Permeable (sandy) sediments cover half of the continental margin and are major regulators of oceanic carbon cycling. The microbial communities within these highly dynamic sediments frequently shift between oxic and anoxic states, and hence are less stratified than those in cohesive (muddy) sediments. A major question is, therefore, how these communities maintain metabolism during oxic–anoxic transitions. [...]"

Source: Nature Microbiology
Authors: Adam J. Kessler et al.
DOI: 10.1038/s41564-019-0391-z

Read the full article here.