FIG. 2.

Culturability and viability of R. leguminosarum. Exponentially growing cells were inoculated into AB salts containing various concentrations of cupric sulfate. At various times after inoculation (time zero), aliquots were removed and the total number of cells (○) and the numbers of culturable (□) and viable (◊) cells were determined. Panels: A, microcosm without cupric sulfate; B, microcosm containing 0.005 mM cupric sulfate; C, microcosm containing 0.05 mM cupric sulfate; D, microcosm containing 0.5 mM cupric sulfate. The error bars represent 1 standard deviation; in most cases, the error bars are too small to be visible.