Abstract
1. 1. The midgut proteinases from Aedes aegypti and Culex fatigans appear to have similar properties. These proteinases show a small peak of activity near pH 5·5, but the greatest activity was found in a broad peak in the alkaline region with a temperature optimum near 46–50°C. 2. 2. Hemoglobin was a more suitable substrate than albumin or γ-globulin. 3. 3. The hydrolysis of N- benzoyl- l - arginine ethyl ester and N- benzoyl- l - tyrosine ethyl ester was demonstrated. 4. 4. The alkaline proteinases were inhibited by serum from normal and malarious chicks, and to a limited extent by disodium ethylenediaminetetra-acetate, and Mg 2+, Ca 2+ and Mn 2+.
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