FIG. 4.

Patterns of uptake of ¹⁴C-labeled microbial products derived from nitrifying bacteria by Chloroflexi that hybridized with probes GNSB-941 and CFX1223 (A), by the members of the CF cluster that hybridized with probe CF319a/b (B), by α-Proteobacteria that hybridized with probe ALF968 (excluding the probe NIT3-hybridized genus Nitrobacter) (C), by γ-Proteobacteria that hybridized with probe GAM42a (D), and by β-Proteobacteria that hybridized with probe BET42a (excluding the probe Nso190-hybridized AOB) (E). The fractions of probe-hybridized and MAR-positive cells that incorporated ¹⁴C-labeled microbial products derived from nitrifying bacteria were expressed as percentages of the total specific probe-hybridized cells. The error bars indicate the standard errors of duplicate samples.