Fig. S1. Representative transmission IR absorption spectra of bacterial and archaeal species.

Table S1.R3/2 values and numbers of analyses of prokaryotes and micro-eukaryotes.

Table S2. Relationship between R3/2 values and relative proportion of bacterial and archaeal populations in bacterial and archaeal culture cells (Escherichia coli and Methanocella paludicola).

Appendix S1. Experimental procedures.

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