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- W2794291877 abstract "Nitrogen (N) fixation is the conversion of inert nitrogen gas (N2) to bioavailable N essential for all forms of life. N2-fixing microorganisms (diazotrophs), which play a key role in global N cycling, remain largely obscure because a large majority are uncultured. Direct probing of active diazotrophs in the environment is still a major challenge. Herein, a novel culture-independent single-cell approach combining resonance Raman (RR) spectroscopy with 15N2 stable isotope probing (SIP) was developed to discern N2-fixing bacteria in a complex soil community. Strong RR signals of cytochrome c (Cyt c, frequently present in diverse N2-fixing bacteria), along with a marked 15N2-induced Cyt c band shift, generated a highly distinguishable biomarker for N2 fixation. 15N2-induced shift was consistent well with 15N abundance in cell determined by isotope ratio mass spectroscopy. By applying this biomarker and Raman imaging, N2-fixing bacteria in both artificial and complex soil communities were discerned and imaged at the single-cell level. The linear band shift of Cyt c versus 15N2 percentage allowed quantification of N2 fixation extent of diverse soil bacteria. This single-cell approach will advance the exploration of hitherto uncultured diazotrophs in diverse ecosystems." @default.
- W2794291877 created "2018-03-29" @default.
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- W2794291877 date "2018-03-20" @default.
- W2794291877 modified "2023-10-18" @default.
- W2794291877 title "Functional Single-Cell Approach to Probing Nitrogen-Fixing Bacteria in Soil Communities by Resonance Raman Spectroscopy with <sup>15</sup>N<sub>2</sub> Labeling" @default.
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- W2794291877 doi "https://doi.org/10.1021/acs.analchem.7b05080" @default.
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