The hypothesis that a number of derivatives of carbamic acids, containing the quaternary nitrogen structure and possessing high biological activity, are not active as contact insecticides because of their inability to penetrate insect cuticle and fatty nerve sheath, has been investigated. Forty-nine lipoid-soluble carbamates have been synthesized
A direct spectrophotometric method for the quantitative determination of ammonia gas at atmospheric pressure utilizes the absorption maximum of ammonia at 204.3 m/x (e, 3127) which allows determinations from 7 p.p.m. (5 y per liter) to 1000 p.p.m. of ammonia in air.
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