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- W2134508082 abstract "ABSTRACT The occurrence and abundance of microbial fatty acids have been used for the identification of microorganisms in microbial communities. However, these fatty acids can also be used as indicators of substrate usage. For this, a systematic investigation of the discrimination of the stable carbon isotopes by different microorganisms is necessary. We grew 11 strains representing major bacterial and fungal species with four different isotopically defined carbon sources and determined the isotope ratios of fatty acids of different lipid fractions. A comparison of the differences of δ 13 C values of palmitic acid (C 16:0 ) with the δ 13 C values of the substrates revealed that the isotope ratio is independent of the growth stage and that most microorganisms showed enrichment of C 16:0 with 13 C when growing on glycerol. With the exception of Burkholderia gladioli , all microorganism showed depletion of 13 C in C 16:0 while incorporating the carbons of glucose, and most of them were enriched with 13 C from mannose, with the exception of Pseudomonas fluorescens and the Zygomycotina. Usually, the glycolipid fractions are depleted in 13 C compared to the phospholipid fractions. The δ 13 C pattern was not uniform within the different fatty acids of a given microbial species. Generally, tetradecanoic acid (C 14:0 ) was depleted of 13 C compared to palmitic acid (C 16:0 ) while octadecanoic acid (C 18:0 ) was enriched. These results are important for the calibration of a new method in which δ 13 C values of fatty acids from the environment delineate the use of bacterial substrates in an ecosystem." @default.
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- W2134508082 date "1998-11-01" @default.
- W2134508082 modified "2023-09-28" @default.
- W2134508082 title "Ratios of Carbon Isotopes in Microbial Lipids as an Indicator of Substrate Usage" @default.
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- W2134508082 doi "https://doi.org/10.1128/aem.64.11.4202-4209.1998" @default.
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