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The nitrogen isotopic composition of amino acids (δ15NAA) is a promising tool for estimating the trophic position and nitrogen sources of organisms in grazing food webs. The utility of δ15NAA analysis of microbial processes in the biogeochemistry remains uncertain, because information about the δ15NAA values of chemotrophic microbes are still limited. In this study, we report the δ15NAA values in...
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