BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//www.bayceer.uni-bayreuth.de//NONSGML kigkonsult.se iCalcreator 2.41.92//
CALSCALE:GREGORIAN
METHOD:PUBLISH
UID:31633961-3030-4363-b839-623133306565
X-WR-CALNAME:BayCMS-Export
X-WR-CALDESC:This is a calendar exported from BayCMS
X-WR-TIMEZONE:Europe/Berlin
BEGIN:VTIMEZONE
TZID:Europe/Berlin
TZUNTIL:20251026T010000Z
BEGIN:STANDARD
TZNAME:CET
DTSTART:20231029T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RDATE:20241027T030000
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:20240331T020000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RDATE:20250330T020000
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
UID:www.bayceer.uni-bayreuth.de-bayceer-t170582id
DTSTAMP:20260814T220004Z
DESCRIPTION:One of the most fascinating features of microorganisms is their
  ability to survive extremely hostile conditions such as desiccation\, UV 
 radiation\, hypersalinity\, and prolonged periods of starvation. The term 
 &lsquo\;dormancy&rsquo\; is often used to describe the state of reduced me
 tabolic activity in which microorganisms endure unfavourable conditions. F
 ew specific microbial taxa are known to form dedicated resting stages\, e.
 g. spores or cysts. However\, physiological and metabolic strategies assoc
 iated with &lsquo\;dormancy&rsquo\; and survival can vary dramatically bet
 ween different habitats and microbial species. For most microbial taxa abu
 ndant in natural ecosystems such survival mechanisms remain unknown. In ar
 id regions\, microbial activity in habitats like surface soils or tidal fl
 ats can suddenly become limited by one critical parameter &ndash\; water a
 vailability. I will present two studies\, where we investigated the functi
 onal potential and activity of microorganisms inhabiting two water-limited
  surface environments\, both exposed to high UV radiation and heat: i) bio
 logical soil crusts of the Negev Desert and ii) salt-saturated microbial m
 ats at the coast of Oman. In biological soil crusts\, resumption of microb
 ial activity during crust rehydration experiments was followed with single
 -cell measurements of biomass generation and population-resolved transcrip
 tomics. In hypersaline microbial mats\, rates of microbial processes such 
 as photosynthesis\, respiration and sulfide oxidation were assessed by mic
 rosensor measurements at varying salinities ranging from 12% NaCl to salt 
 saturation. Both studies included a detailed analysis of genetic potential
  of the dominant microbial populations via genome-resolved metagenomics wi
 th focus on energy metabolism and stress tolerance mechanisms. In both hab
 itats\, we found microbial communities that are highly adapted to survive 
 the prolonged water availability limitation and resume activity upon stres
 s relief\, albeit in different ways. While nearly all microbial activity w
 as paused in dry biological soil crusts resuming sharply within the first 
 hours after rehydration\, certain processes were still active at lower rat
 es in salt saturated microbial mats. The differences between stress impose
 d on microorganisms by hypersalinity and desiccation stress are further mi
 rrored in the different stress tolerance genes of the major photoautotroph
 ic primary producers in both microbial communities\, halophilic and desicc
 ation-tolerant cyanobacteria\, respectively. Taken together\, the insights
  gained in these in situ and microcosm studies extend our knowledge of des
 iccation and hypersalinity survival mechanisms in environmentally relevant
  microorganisms and help us understand the patterns of microbial activity\
 , a major catalyst of biogeochemical cycles.
DTSTART;TZID=Europe/Berlin:20240418T121500
DTEND;TZID=Europe/Berlin:20240418T134500
LOCATION:H6\, Geo
SUMMARY:Dr. Dimitri Meier\, Ecological Microbiology\, BayCEER (Homepage): S
 urvival\, 'dormancy'\, and resuscitation of microorganisms in water-limite
 d environments: insights from coastal salt flats and desert soil crusts
TRANSP:TRANSPARENT
END:VEVENT
END:VCALENDAR