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Relationship between the absolute amount of nitrogen oxidized and the 13C incorporation in characteristic biomarkers: the biphytane moieties of the GDGTs, more specifically crenarchaeol, as a biomarker for ‘Candidatus Nitrososphaera gargensis' and the 11 methyl C16:0 as a specific phospholipid fatty acid biomarker of Nitrospira spp. Data points represent the average replicate extractions (n=3), and error bars represent the s.e.
