Concentrations Of Hydroxamic Acids Research Articles

Role of hydroxamic acids in the resistance of cereals to aphids

Hydroxamic acid concentration in Gramineae, both natural and incorporated, correlates with resistance to the aphid Metopolophium dirhodum. 2,4-Dihydroxy-7-methoxy-2H-1,4-benzoxazin-3(4H)-one, a hydroxamic acid isolated from corn extracts, is deleterious to aphids fed on artificial diets. It is proposed that hydroxamic acids act as naturally-occurring protective factors against M. dirhodum.

Methaemoglobin formation by ethyl N-hydroxycarbamate and related compounds.

Summary. Methyl, ethyl and n‐propyl N‐hydroxycarbamates and hydroxyurea catalysed the conversion of haemoglobin into methaemoglobin in the presence of oxygen. The rate of the reaction with ethyl N‐hydroxycarbamate increased with increasing hydroxamic acid concentration. The conversion also occurred when urethane was incubated with oxyhaemoglobin in the presence, but not in the absence, of an in vitro metabolizing system.