BEGIN:VCALENDAR
PRODID:-//Columba Systems Ltd//NONSGML CPNG/SpringViewer/ICal Output/3.3-
 M3//EN
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20190219T141318Z
DTSTART:20190327T130000Z
DTEND:20190327T140000Z
SUMMARY:Uranium as a contaminant and a paleoredox proxy
UID:{http://www.columbasystems.com/customers/uom/gpp/eventid/}jud-jrq7kac
 y-t7m7n7
DESCRIPTION:Uranium (U)\, present in the tetravalent form (relatively ins
 oluble as U(IV)) in igneous rocks\, undergoes oxidation and mobilization
  as part of weathering. As a result\, oxidized uranium (hexavalent\, U(V
 I)) is present in surface waters\, particularly in areas with an underly
 ing granitic bedrock. In anoxic soils and sediments\, uranium can accumu
 late through reductive processes\, forming natural hotspots. Looking thr
 ough the sedimentary rock record\, one can consider the accumulation of 
 U as an indication of local anoxic conditions and the associated isotopi
 c fractionation may reveal more detail about the depositional environmen
 t. Additionally\, uranium can be a contaminant in the subsurface as a re
 sult of anthropogenic activities such as mining and processing of nuclea
 r fuel. Arresting the transport of uranium in the subsurface by  reducin
 g uranium in contaminated environments\, through harnessing microbial an
 d chemical reductive mechanisms\, has been proposed as a engineered reme
 diation strategy.  \nA thorough understanding of the mechanism of U(VI) 
 reduction and the attendant isotopic fractionation is necessary in order
  to interpret the geological record and to optimize U remediation strate
 gies.\nHere\, I will present recent development in laboratory-based inve
 stigations of the reduction of U(VI) by microorganisms as well as by min
 erals along with advances in constraining the associated isotopic fracti
 onation. The work presented will span mechanistic understanding of micro
 bial and abiotic U reduction as well as investigations of the stability 
 of sediment-trapped tetravalent U. Overall\, I hope to provide an overvi
 ew of the exiting new developments in U biogeochemistry. \n
STATUS:TENTATIVE
TRANSP:TRANSPARENT
CLASS:PUBLIC
LOCATION:G.03\, Williamson Building\, Manchester
END:VEVENT
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