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PRODID:-//Memento EPFL//
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SUMMARY:Metals\, minerals and microbes: geomicrobiology and bioremediation
DTSTART:20100308T161500
DTSTAMP:20260924T195704Z
UID:94ba2ae808dab3c282e09b0a85f398587b3101daf90e239b2e461ace
CATEGORIES:Conferences - Seminars
DESCRIPTION:Gadd\, Geoff\nMicrobes are intimately involved in many geologi
 cal phenomena\, and these include biotransformations of metals and mineral
 s\, as well as related substances like metalloids\, and metal radionuclide
 s. Such processes are involved in bioweathering\, mineral dissolution and 
 formation\, and soil formation and development. Integral to all mechanisms
  are interactions with metals\, and a variety of processes determine mobil
 ity and bioavailability. Metal mobilization can arise\, e.g. from leaching
  mechanisms\, and complexation by metabolites. Immobilization can result f
 rom sorption\, transport and intracellular sequestration or precipitation 
 as a variety of "organic" and inorganic biominerals\, e.g. oxalates (fungi
 )\, carbonates\, phosphates and sulfides. Secondary minerals may also resu
 lt as products of organic matter decomposition or mineral dissolution reac
 t with other environmental constituents. Our research seeks to understand 
 the mechanisms of microbial metal and mineral biotransformations\, and the
 ir environmental and applied significance in bioremediation\, biodeteriora
 tion and corrosion. Our research has concentrated on chemoorganotrophic tr
 ansformations by free-living and mycorrhizal fungi\, and metal precipitati
 on by anaerobic sulfate-reducing bacteria. Specific examples in this prese
 ntation may include fungal degradation and transformations of metal-contai
 ning minerals\, depleted uranium and uranium oxides\, fungal biodeteriorat
 ion of concrete (which may have implications for containment and storage o
 f radioactive waste)\, metal sulfide precipitation and reduction of metall
 oid oxyanions to elemental forms by sulfate-reducing bacteria. 
LOCATION:GR B3 30
STATUS:CONFIRMED
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