Abstract
The uptake of potassium and rubidium was followed during growth of Staphylococcus pyogenes. Uptake is logarithmic during logarithmic growth: rates of net uptake, intracellular concentration and accumulation have been calculated. In the presence of rubidium, there is diphasic logarithmic growth. Rubidium and potassium compete for entry and there is evidence of competition for efflux. The uptake of rubidium is dependent on its external concentration and is in excess of the potassium normally taken up. A model is proposed. The staphylococcus at the end of growth leaks potassium very slowly. Uptake of sugar occurs in the absence of net uptake of potassium.
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