Figure 2

NanoSIMS visualization of phenotypic heterogeneity with regard to substrate assimilation among “Ca. M. parvicella” filaments under aerobic or anoxic conditions. The micrographs show 13C-oleic acid assimilation after 1 h (a–d) and 8 h during the fatty acid assimilation experiment (e–h) and 13C-glycerol-3-phosphate after 24 h when administered as a single substrate during the simultaneous substrate assimilation experiment (k–n).