FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2792830565> ?p ?o ?g. }

• W2792830565 endingPage "164" @default.
• W2792830565 startingPage "155" @default.
• W2792830565 abstract "Many chemical processes generate subtle but readily measured changes in isotope compositions of elements across the periodic table. The elements involved therefore carry diagnostic information about their chemical histories in complex geochemical or biochemical environments. Distinctive Cr isotope signatures can be used to identify immobilization processes of Cr in the environment, such as microbial Cr(VI) reduction, abiotic Cr(VI) reduction, and adsorption. Here we demonstrate that under well-controlled conditions, Cr isotopes can also be used to distinguish between different biological Cr(VI) reduction pathways. The reduction of Cr(VI) by two facultative anaerobic bacteria, Pseudomonas fluorescens LB 300 and Shewanella oneidensis MR 1, was investigated to determine the conditions under which Cr(VI) is reduced and to quantify the corresponding isotope signatures. The present study considers the effects of a broad range of parameters on Cr isotope fractionation, including bacterial species, electron donors, pH, and respiration pathways (aerobic vs. anaerobic) that must be considered for understanding Cr isotope variations under different experimental and environmental conditions. In the bacterial Cr(VI) reduction experiments, the 53Cr/52Cr isotope ratio of the remaining Cr(VI) increased by up to + 8‰, indicating that lighter isotopes of Cr were preferentially reduced. In aerobic experiments, although Cr reduction rates increased as pH increased from 4 to 8, the fractionation factor did not vary significantly (ε = −3.21 ± 0.18‰). Experiments using different electron donors demonstrated that citrate promoted the greatest Cr reduction rate compared with glucose, acetate, and propionate. Under aerobic conditions, although the Cr(VI) reduction rates varied substantially between different experimental settings, the isotope fractionation factors were indistinguishable between all the environmental conditions examined (ε = −3.1‰), with the exception of when citrate was the electron donor (ε = −4.3‰). Cr reduction rates were generally much faster under anaerobic conditions for both bacteria investigated. The utilisation of different electron donors resulted in the same Cr reduction rates by the bacteria, but fractionated Cr with a broad range of isotope fractionation factors, from − 1.58 ± 0.16‰ to − 4.93 ± 0.36‰. Although it has been proposed in many previous studies that there is an inverse relationship between reduction rates and the fractionation factors, no clear relationship between the reduction rates and fractionation factors was observed in this study. The Cr isotope fractionation factors ε were insensitive to pH and electron donor concentration, but dependent on the type of electron donors and redox conditions in the cultures. This indicates that isotope variations may be used to identify when different biological pathways are involved, and so to investigate metabolic processes. The ε value from all experimental conditions examined ranged between − 1.58 and − 4.93‰, with a mean value at − 3.3‰. While Cr isotopes might be used to separate the effects of abiotic and microbially mediated reduction in environmental sites, the fractionation factors from reduction by individual bacterial species overlap with those from several individual abiotic reduction processes, suggesting that site-specific data (e.g., fractionation factors associated with indigenous bacterial populations and local groundwater chemistry) are required in order to use Cr isotopes to distinguish between different reduction mechanisms." @default.
• W2792830565 created "2018-03-29" @default.
• W2792830565 creator A5015458130 @default.
• W2792830565 creator A5016589170 @default.
• W2792830565 creator A5031326847 @default.
• W2792830565 creator A5057620770 @default.
• W2792830565 creator A5063871733 @default.
• W2792830565 date "2018-03-01" @default.
• W2792830565 modified "2023-10-14" @default.
• W2792830565 title "Variations of stable isotope fractionation during bacterial chromium reduction processes and their implications" @default.
• W2792830565 cites W1963678758 @default.
• W2792830565 cites W1963978426 @default.
• W2792830565 cites W1964963456 @default.
• W2792830565 cites W1966135747 @default.
• W2792830565 cites W1971637371 @default.
• W2792830565 cites W1975373641 @default.
• W2792830565 cites W1979865046 @default.
• W2792830565 cites W1991473661 @default.
• W2792830565 cites W1994318444 @default.
• W2792830565 cites W1996859860 @default.
• W2792830565 cites W1999607411 @default.
• W2792830565 cites W1999812518 @default.
• W2792830565 cites W2008995300 @default.
• W2792830565 cites W2013528197 @default.
• W2792830565 cites W2015104278 @default.
• W2792830565 cites W2017080552 @default.
• W2792830565 cites W2017103972 @default.
• W2792830565 cites W2017545469 @default.
• W2792830565 cites W2022885774 @default.
• W2792830565 cites W2024004860 @default.
• W2792830565 cites W2025351262 @default.
• W2792830565 cites W2028346185 @default.
• W2792830565 cites W2035413328 @default.
• W2792830565 cites W2039045142 @default.
• W2792830565 cites W2040138008 @default.
• W2792830565 cites W2046573595 @default.
• W2792830565 cites W2048811810 @default.
• W2792830565 cites W2052767015 @default.
• W2792830565 cites W2053452699 @default.
• W2792830565 cites W2055854712 @default.
• W2792830565 cites W2056437294 @default.
• W2792830565 cites W2056472979 @default.
• W2792830565 cites W2060617303 @default.
• W2792830565 cites W2074334185 @default.
• W2792830565 cites W2076153892 @default.
• W2792830565 cites W2083903928 @default.
• W2792830565 cites W2107225219 @default.
• W2792830565 cites W2125756844 @default.
• W2792830565 cites W2170791433 @default.
• W2792830565 cites W2313458345 @default.
• W2792830565 cites W2325637924 @default.
• W2792830565 cites W2463828545 @default.
• W2792830565 cites W2528817809 @default.
• W2792830565 cites W2591641290 @default.
• W2792830565 cites W4248140933 @default.
• W2792830565 cites W50940949 @default.
• W2792830565 doi "https://doi.org/10.1016/j.chemgeo.2018.02.004" @default.
• W2792830565 hasPublicationYear "2018" @default.
• W2792830565 type Work @default.
• W2792830565 sameAs 2792830565 @default.
• W2792830565 citedByCount "19" @default.
• W2792830565 countsByYear W27928305652019 @default.
• W2792830565 countsByYear W27928305652020 @default.
• W2792830565 countsByYear W27928305652021 @default.
• W2792830565 countsByYear W27928305652022 @default.
• W2792830565 countsByYear W27928305652023 @default.
• W2792830565 crossrefType "journal-article" @default.
• W2792830565 hasAuthorship W2792830565A5015458130 @default.
• W2792830565 hasAuthorship W2792830565A5016589170 @default.
• W2792830565 hasAuthorship W2792830565A5031326847 @default.
• W2792830565 hasAuthorship W2792830565A5057620770 @default.
• W2792830565 hasAuthorship W2792830565A5063871733 @default.
• W2792830565 hasBestOaLocation W27928305652 @default.
• W2792830565 hasConcept C107872376 @default.
• W2792830565 hasConcept C121332964 @default.
• W2792830565 hasConcept C127313418 @default.
• W2792830565 hasConcept C151730666 @default.
• W2792830565 hasConcept C164304813 @default.
• W2792830565 hasConcept C178790620 @default.
• W2792830565 hasConcept C185592680 @default.
• W2792830565 hasConcept C22117777 @default.
• W2792830565 hasConcept C2779334269 @default.
• W2792830565 hasConcept C2781170380 @default.
• W2792830565 hasConcept C43617362 @default.
• W2792830565 hasConcept C511782168 @default.
• W2792830565 hasConcept C523546767 @default.
• W2792830565 hasConcept C62520636 @default.
• W2792830565 hasConcept C97428945 @default.
• W2792830565 hasConceptScore W2792830565C107872376 @default.
• W2792830565 hasConceptScore W2792830565C121332964 @default.
• W2792830565 hasConceptScore W2792830565C127313418 @default.
• W2792830565 hasConceptScore W2792830565C151730666 @default.
• W2792830565 hasConceptScore W2792830565C164304813 @default.
• W2792830565 hasConceptScore W2792830565C178790620 @default.
• W2792830565 hasConceptScore W2792830565C185592680 @default.
• W2792830565 hasConceptScore W2792830565C22117777 @default.
• W2792830565 hasConceptScore W2792830565C2779334269 @default.
• W2792830565 hasConceptScore W2792830565C2781170380 @default.

• next