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. 1999 Apr;65(4):1789–1793. doi: 10.1128/aem.65.4.1789-1793.1999

FIG. 1.

FIG. 1

Methane production rate curve for methanol-degrading sludge. The following three phases were distinguished: (i) an exponential methane production rate (phase I), (ii) a decrease in the rate (phase II), and (iii) an additional arithmetic increase in the rate (phase III). Ni and Co were each added at a concentration of 1 μM.