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TZUNTIL:20041031T010000Z
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DTSTART:20011028T030000
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RDATE:20021027T030000
RDATE:20031026T030000
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DTSTAMP:20260820T102012Z
DESCRIPTION:Hydrogen (H2) is a major intermediate in the oxidation of organ
 ic matter. It is present in all natural environments\, typically in extrem
 ely low concentrations of ~0.01-20 nmol/L in water. H2 is produced by ferm
 entation of organic matter and used in terminal electron acceptor proccess
 es (TEAP\'s) e.g. reduction of sulfate to sulfide. In-situ concentrations 
 of reactants\, of which H2 is one\, and products enable the calculation of
  the Gibbs energy available for the TEAP\'s. This has shown that the ferme
 nting microorganisms and the TEAP microorganisms form a thermodynamically 
 optimized eco-system enabling sustained oxidation of organic matter. The e
 nergy available for the TEAP processes\, when they occur\, is small\, and 
 close to constant in a given system. Some studies indicate that this is al
 so the case for the degradation of xenobiotic compounds. The small energy 
 involved means that the processes occur close to equilibrium. This makes i
 t possible to view redox processes as taking place at partial equilibrium\
 , implying that the overall rate of the TEAP\'s is controlled by the rate 
 of supply of fermentation products\, while the TEAP\'s can be handled as e
 quilibrium reactions. This approach greatly simplifies numerical modelling
  of redox processes in natural environments.
DTSTART;TZID=Europe/Berlin:20021017T161500
DTEND;TZID=Europe/Berlin:20021017T235959
LOCATION:H6
SUMMARY:Prof. Rasmus Jacobsen\, Technical University of Denmark\, Lyngby: H
 ydrogen\, the common Currency of anaerobic Processes? Sampling Methods\, B
 ioenergetics\, and the Application in partial Equilibrium Models of Redox 
 Processes
TRANSP:TRANSPARENT
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