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TZUNTIL:20201025T010000Z
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DTSTART:20181028T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t144475id
DTSTAMP:20260805T124107Z
DESCRIPTION:In my talk\, I will highlight two recent findings of my laborat
 ory: the metagenomics-based discovery of putatively novel sulfate reducers
  and the enrichment of microorganisms performing the W&auml\;chtersh&auml\
 ;user reaction in syntrophy with methanogenic Archaea.\n\nThe majority of 
 microorganisms is still uncharted land and for a good reason called microb
 ial dark matter. Analyses based on the functional marker genes dsrAB (codi
 ng for the dissimilatory sulfite reductase) are often used to characterize
  sulfite and sulfate reducers and revealed at least 13 uncultured family-l
 evel lineages. Many of these lineages can be encountered in freshwater wet
 lands\, which are characterized by cryptic sulfur cycling. I will present 
 how we used environmental systems biology of rice paddy soil to identify a
 nd study the physiology of such novel microorganisms.\nThe exergonic react
 ion of FeS with H2S to form FeS2 (pyrite) and H2 was postulated to have op
 erated as an early form of energy metabolism on primordial Earth. Since th
 e Archean\, sedimentary pyrite formation played a major role in the global
  iron and sulfur cycles\, with direct impact on the redox chemistry of the
  atmosphere. To date\, pyrite formation was considered a purely geochemica
 l reaction. I will present how an isolation process of &gt\;20 years and m
 odern chemical analytics can be combined to obtain and characterize a micr
 obial enrichment culture\, which grows solely with FeS\, H2S\, and CO2 as 
 substrates to produce FeS2 and CH4.\n\n&nbsp\;\n*** Invited by Britta Plan
 er-Friedrich\, Environmental Geochemistry
DTSTART;TZID=Europe/Berlin:20181129T120000
DTEND;TZID=Europe/Berlin:20181129T133000
SUMMARY:Prof. Dr. Michael Pester\, Leibniz Institute DSMZ & Technical Unive
 rsity of Braunschweig (Homepage): New aspects of microbial sulfur cycling:
  from novel sulfate reducers to pyrite-forming microorganisms
TRANSP:TRANSPARENT
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