title: Differential isotopic fractionation during Cr(VI) reduction by an aquifer-derived bacterium under aerobic versus denitrifying conditions.
abstract: We studied Cr isotopic fractionation during Cr(VI) reduction by Pseudomonas stutzeri strain RCH2. Despite the fact that strain RCH2 reduces Cr(VI) cometabolically under both aerobic and denitrifying conditions and at similar specific rates, fractionation was markedly different under these two conditions (ε was ∼2‰ aerobically and ∼0.4‰ under denitrifying conditions).
authors.affiliation: Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA.
authors.forename: Ruyang
authors.initials: R
authors.lastname: Han
authors.forename: Liping
authors.initials: L
authors.lastname: Qin
authors.forename: Shaun T
authors.initials: ST
authors.lastname: Brown
authors.forename: John N
authors.initials: JN
authors.lastname: Christensen
authors.forename: Harry R
authors.initials: HR
authors.lastname: Beller
mesh_terms: D000332:Aerobiosis; D001673:Biodegradation, Environmental; D005591:Chemical Fractionation / Q000379:methods*; D002857:Chromium / Q000737:chemistry / Q000378:metabolism*; D002859:Chromium Isotopes / Q000032:analysis; D058440:Denitrification; D009573:Nitrites / Q000378:metabolism*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000378:metabolism*; D044223:Pseudomonas stutzeri / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism
chemical_list: D002859:Chromium Isotopes; D009573:Nitrites; D014874:Water Pollutants, Chemical; D002857:Chromium; D010100:Oxygen