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Effect of pH on cellobiose transport by mixed ruminal bacteria. Cells were incubated in the presence of cellobiose (0.01 mM) and nojirimycin-1-sulfate (20 μM) in buffers containing 25 mM Na2HPO4 and 50 mM MES (2-[N-morpholino]ethanosulfonic acid), which were adjusted at various pH levels. Circles with different letters indicate significant differences (P < 0.05).
