Abstract
Summary
(1) The relative effects of 16 dinitrophenols in inhibiting the oxygen uptake mechanism of spores of Myrothecium verrucaria were studied. (2) The alkyl-, cyclo-alkyl-, or aryl- groups substituted ortho to the hydroxyl group in the 2,4-DNP molecule significantly increased the poisoning effect on this oxidative mechanism as compared to 2,4-DNP. (3) Effective concentrations of all active compounds manifested their full effect within an hour following contact with the spores. (4) The inhibitory effect as caused by all the alkyl substituted 2,4- and 2,6-DNPs averaged 85-90%. (S) Concentrationwise, the 6-n-hexyl-2,4-DNP compound proved the most potent, while dinitrosaricylic, picramic, and picric acids were significantly ineffective.
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