Influence of Glucose and Ammonium Ions on Endogenous Respiration. ∗

Abstract

Summary

Pseudomonas aeruginosa, Escherichia coli or Serratia marcescens were uniformly labeled during growth on glucose in a buffered basal salt solution. The endogenous C¹⁴O₂ production of these organisms in dilute suspensions of washed cells was suppressed by glucose under either growth or nongrowth conditions, to a somewhat greater extent under the former conditions. Increasing the concentration of bacteria tended to decrease the extent to which endogenous respiration was suppressed in the presence of glucose. These results suggest that the amount of substrate (or O₂) available per cell is an important factor in controlling the extent of endogenous respiration in the presence of an exogenous substrate.