FIG. 2.

FT-IR spectra of cells of S. oneidensis MR-1 collected at different time intervals from aerobic and anaerobic cultures. The bars at the top of the figure relate to the following biochemical regions: FA, fatty acids; A₁, amide I; A₂, amide II; A₃, amide III; MP, carboxylic groups of proteins and fatty acids (phosphate rich); PS, polysaccharides; L, RNA and DNA. The six spectra (from bottom to top) are as follows: Ae12, aerobic conditions in exponential phase (12 h); Ae34, aerobic conditions in stationary phase (34 h); Ae50, aerobic conditions in death phase (50 h); An17, anaerobic conditions in exponential phase (17 h); An48, anaerobic conditions in stationary phase (48 h); An72, anaerobic conditions in death phase (72 h). These spectra are offset so that the spectral features can be clearly seen.