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TZUNTIL:20111030T010000Z
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DTSTART:20091025T030000
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RDATE:20101031T030000
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DTSTAMP:20260820T044412Z
DESCRIPTION:Eingeladen durch Britta Planer-Friedrich. Alkylated metal(loid)
  species occur in the environment preferentially within reducing and acid 
 habitats\; while methylated compounds are naturally formed by biomethylati
 on\, higher alkylated ones are of industrial origin (e.g. biocides). They 
 can be found in fully and partly alkylated forms\, thus resembling volatil
 e (in air) and water soluble species\, resp. Up to now more than hundred s
 pecies have been described in highly variable concentrations (mass fractio
 ns from 10-12 to 10-5). These concentrations significantly overlap with th
 ose for which biological effects are observed\, so certain environmental s
 cenarios (“hot spots”) demand toxicological evaluation (e.g. MMM in fish\,
  TMA in natural gas or alkylated As\, Sb\, and Sn in composting). Besides 
 investigating the toxicity of alkylated metal(loid) species in respect to 
 human health\, additionally it will be interesting to know\, if methylatio
 n can also happen in the course of human metabolism. While this is fairly 
 good known for methylation of arsenic in the liver\, it seems not to be th
 e case for mercury (where mainly demethylation is reported). Our group was
  successful to prove some methylation for bismuth\, but for this element a
 nother interesting pathway could be pointed out: Methylated forms can be f
 ormed in the colon via biomethylation\, and subsequently are found in bloo
 d and exhaled air. 
DTSTART;TZID=Europe/Berlin:20091105T161500
DTEND;TZID=Europe/Berlin:20091105T174500
LOCATION:H6
SUMMARY:Prof. Alfred Hirner\, Univ. Duisburg-Essen\, Institut für Umweltana
 lytik und Angewandte Geochemie: Alkylated metal(loid) species in environme
 ntal chemistry and medicine
TRANSP:TRANSPARENT
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