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Interspecies hydrogen transfer in anoxic ecosystems is essential for the complete microbial breakdown of organic matter to methane. Acetogenic bacteria are key players in anaerobic food webs and have been considered as prime candidates for hydrogen cycling. We have tested this hypothesis by mutational analysis of the hydrogenase in the model acetogen Acetobacterium woodii. Hydrogenase-deletion mutants no longer grew on H2 + CO2 or organic substrates such as fructose, lactate, or ethanol. Heterotrophic growth could be restored by additio

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The objective of this systematic review was to characterise psychological impacts of the COVID-19 pandemic related to fertility care. We conducted a systematic search following PRISMA guidelines of five databases (EMBASE, Medline-OVID, CINAHL, Web of Science, and PsycINFO) from March 17th 2020 to April 10th 2021. Citing articles were also hand-searched using Scopus. Of the 296 original citations, we included fifteen studies that encompassed 5,851 patients seeking fertility care. Eleven studies only included female par