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DTSTART:20141026T030000
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RDATE:20151025T030000
RDATE:20161030T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t131288id
DTSTAMP:20260811T073007Z
DESCRIPTION:Bacteria are involved in the redox transformations of selenium 
 (Se) contributing to the biogeochemical cycle of this chalcogen element. T
 he metabolism of Se by bacteria follows several basic strategies which inc
 lude (1) cellular energy production coupled to oxidation/reduction reactio
 ns\, (2) satisfying a trace element requirement for nutrition\, and (3) de
 toxification processes. Se has four oxidation states\, (+VI)\, (+IV)\, (0)
  and (-II)\, that are commonly observed in biology. Se oxyanions\, selenat
 e (Se[VI]\, SeO42-) and selenite (Se[IV]\, SeO32-) are water soluble and t
 oxic but a number of bacteria can reduce them to elemental Se\, Se(0)\, ei
 ther as a detoxification response or to generate energy by using the oxyan
 ions as final electron acceptors. Se(0) is insoluble and shows a lower tox
 icological potential\, however it exhibits colloidal properties that contr
 ibute to its environmental persistence. The microbial-mediated reduction o
 f Se can proceed down to selenides\, Se(-II)\, both for the production of 
 Se-containing molecules (e.g. selenoproteins) in an assimilatory fashion a
 nd to detoxify Se in the form of methylated chemical species. Bacterial ox
 idation of lower valance states of Se has also been documented but the rea
 ction rates are several orders of magnitude lower than the reductive side 
 of the cycle. To achieve the Se metabolic activities\, numerous unique enz
 ymes are employed. While some enzymes from the selenium cycle have been is
 olated and are markedly specific for Se\, many of the Se enzymes remain to
  be isolated. An understanding of selenium metabolism is complicated by th
 e observations that enzymes from sulfur or nitrogen metabolism may also re
 cognize selenium compounds. From a biotechnological perspective\, Se resis
 tant bacteria can be employed in a variety of applications ranging from Se
 -laden wastewater treatment (i.e. bioremediation) to the production of sem
 iconductor quantum dots.
DTSTART;TZID=Europe/Berlin:20151007T100000
DTEND;TZID=Europe/Berlin:20151007T113000
LOCATION:Room 204\,  2. floor/Geo III
SUMMARY:Dr. Lucian Staicu\, University of Franche-Comté\, Department of Sci
 ence and Technology\, Besançon\, France (Homepage): Bacterial metabolism o
 f selenium. Survival or profit?
TRANSP:TRANSPARENT
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