[Absence of a correlation between the respiratory resistance of bacteria to cyanide and their cytochrome d content].

The object of this work was to study whether a correlation existed between the content of cytochrome d in different bacterial cells and the inhibition of their respiration by cyanide. No correlation was found between the concentration of cytochrome d and the degree of resistance to cyanide of the bacterial respiration. Just as the cyanide-resistant respiration of eukaryotic microorganisms, the cyanide-resistant respiration of bacteria was concluded to involve the operation of oxidase whose nature was not cytochromic .