Abstract
Members of subdivision 1 of the phylum Acidobacteria were grown at different pH values in a new medium formulation named PSYL 5, which includes sucrose as a carbon source and other compounds (such as KH2PO4 and MgSO4.7H2O). Growth rate was nearly constant at pH 5.0 and declined at pH 3-4 and 6-7. However, it was found that effects involving good carbon/nitrogen ratios and pH on the growth of the members of Acidobacteria subdivision 1 were significant, and the strongest effect of these conditions was at pH 5.0. In addition, incubation time of 48, 72, 96 and 120 h was shorter than that described previously for members of Acidobacteria subdivision 1 on solid laboratory media.
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