Microbial hydrogen oxidation potential in seasonally hypoxic Baltic Sea sediments

Frontiers in Microbiology, Journal Year: 2025, Volume and Issue: 16

Published: April 4, 2025

The majority of the organic matter (OM) degradation on seafloor occurs in coastal regions. Since oxygen (O 2 ) becomes quickly depleted top sediments, most OM decomposition is driven by microbial sulfate reduction (SR) and fermentation, latter generating molecular hydrogen (H ). If H not consumed hydrogenotrophic microorganisms accumulates sedimentary porewaters, hindered. Despite importance scavenging for mineralization, knowledge oxidizers their constraints marine sediments still quite limited. Here we investigated role (2 to 5 cm, suboxic-sulfidic) bottom (18 22 sulfidic) from a location exposed seasonal hypoxia SW Baltic Sea. We used April, May August, representative different seasons. spiked respective sediment slurries with incubated them up 4 weeks under O -free conditions. consumption potential, methane production shifts bacterial archaeal 16S rRNA gene amplicons (generated RNA) were assessed over time. variations community compositions pore water geochemistry already gave distinct starting conditions enrichments. Sediments near anoxic favored starter exhibiting highest oxidation potential. Most observed potential appeared associated reducers. putative involvement massively enriched ANME cycling 18 cm horizons conspicuous. While differences potentials studied are likely related (season-depending) overall redox state interstitial waters, influence interconnections could be fully resolved evaluated, demonstrating need further consumption- community-based studies.

Language: Английский

New insights in uranium bioremediation by cytochromes of the bacterium G. uraniireducens

Journal of Biological Chemistry, Journal Year: 2024, Volume and Issue: unknown, P. 108090 - 108090

Published: Dec. 1, 2024

Language: Английский