Reduced gravity promotes bacterially mediated anoxic hotspots in unsaturated porous media.

ABSTRACT: Human endeavours into deep space exploration and the prospects of establishing colonies on nearby planets would invariably involve components of bioregenerative life support for food production, cabin atmosphere renewal, and waste recycling. Growing plants and their microbiomes in porous media under different gravitational fields may present new challenges due to effects of liquid distribution on gaseous exchange with roots and microorganisms. We provide the first direct evidence that capillary driven liquid reconfiguration in porous media under reduced gravity conditions reduces oxygen diffusion pathways and enhances anoxic conditions within bacterial hotspots. Parabolic flight experiments using model porous media inoculated with aerobic and facultative anaerobic bacteria reveal the syste

SUBMITTER: Borer B 

PROVIDER: S-EPMC7248055 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature