Fig. 3: The NOSC of removed DOM was correlated with the contribution of organoheterocyclics and total dissolved amino acids to the removed DOM. | Communications Biology

Fig. 3: The NOSC of removed DOM was correlated with the contribution of organoheterocyclics and total dissolved amino acids to the removed DOM.

From: Oxidation state of bioavailable dissolved organic matter influences bacterioplankton respiration and growth efficiency

Fig. 3

a Less organoheterocyclics were removed when cells were using more reduced DOM (R = 0.78, p = 0.001, n = 14). b The percentage of total dissolved amino acids (TDAA) removed also decreased when heterotrophs were using more reduced DOM (relative to removed total organic carbon (TOC)), calculated as the removal rate of TDAA C / TOC (R = 0.83, p = 0.012, n = 8). c Example structures are shown for library matches of various organoheterocyclic compounds in removed DOM, including: (1) 1,3,7-trimethylpurine-2,6-dione, (2) ethyl-4-dimethylaminobenzoate, (3) 1-methyl-4,9-dihydro-3H-pyrido[4,3-b]indol-7-ol, (4) 5-butylpyridine-2-carboxylic acid, (5) ethyl 3-indoleacetate, (6) quinoline, (7) 9H-purin-6-amine, and removed TDAA compounds included (8) aspartic and (9) glutamic acids, (10) serine, and (11) leucine. d The rate of change for ∆TDAA as carbon between initial and equilibrium growth phases was significantly and negatively correlated with the NOSC of removed DOM (R = −0.80, p = 0.0178, n = 8). The solid black and dotted lines represent the model II linear fit and 95% confidence intervals, respectively. The error bars represent standard deviations.

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