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Effect of betaine and [K+] on kdp expression and growth rate in strain TK2469 grown in medium containing 0.3 M added salt. Data were obtained as described in Materials and Methods and plotted as described for Fig. 1. Open symbols are for the absence of betaine, and filled symbols are for the presence of 2.5 mM betaine. The control (100%) growth rate was 0.57 h−1.
