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Growth of M. maripaludis strain JJ and mutants attached to 99.6% nickel solder tabs. (A and B) Quantification of surface-associated biomass stained with crystal violet from cultures grown in McCas medium with H2 provided as the sole electron donor (A) or McCas-formate (B). Cultures were grown without agitation. Data are averages and standard deviations from three independent experiments. *, P < 0.05; **, P < 0.01; ***, P < 0.001.
