Abstract
A study of the action of DNP on the respiration of Euglena gracilis (Z Klebs strain) treated or untreated with antimycin shows that the generation time of cells increases proportionally to DNP concentration from 10-6 to 10-5 M, with a further increase beyond. The intensity of respiration also increases but reverts after 24 hours. Cyanide resistance, related to the concentration of DNP, appears only 24 hours after addition of the latter, indicating a block towards the end of the respiratory chain. The photoconsumption of oxygen, due to the action of UV on the ubiquinone complex, diminishes and becomes negligible at high concentrations of DNP, implying that DNP acts on ubiquinone.
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