13C isotopic fractionation during biodegradation of agricultural wastes

Isotopes in Environmental and Health Studies
Phillip M ChalkDeli Chen

Abstract

Significant differences in δ(13)C signatures occur within and between plant tissues and their constituent biochemical entities, and also within and between heterotrophic bacteria and fungi and their metabolic products. Furthermore, (13)C isotopic fractionation occurs during the biodegradation of organic molecules as seen in the substrate, respired CO(2) and the microbial biomass, which could be related to substrate composition and/or microbial metabolism. The (13)C isotopic fractionation observed during the decomposition of a single defined C substrate appears to be due to the intra-molecular heterogeneity in (13)C in the substrate and to (13)C isotopic fractionation during microbial metabolism. Very limited data suggest that the latter may be quantitatively more important than the former. Studies with defined fungi in culture media have highlighted the complexities associated with the interpretation of the observed patterns of (13)C isotopic fractionation when a single defined C source is added to the culture medium which itself contains one or more C sources. Techniques involving (13)C enrichment or paired treatments involving an equivalent C(3)- and C(4)-derived substrate have been devised to overcome the problem of backgrou...Continue Reading

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Citations

Sep 26, 2017·Isotopes in Environmental and Health Studies·Caio T InácioSegundo Urquiaga
Jul 1, 2017·Environmental Science and Pollution Research International·Jun ZhongJing Liu

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Methods Mentioned

BETA
nuclear magnetic resonance

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