Search PubMed⌕ Search

Biomedical subjects

C F Cohen

Publications and source records attributed to C F Cohen.

13 recordsLinked to original sources
PubMed1975

Nonsteroidal secondary and tertiary amines: inhibitors of insect development and metamorphosis and delta-24-sterol reductase system of tobacco hornworm.

Several new branched and straight chain secondary and tertiary amines were shown to have inhibitive effects upon development and metamorphosis and the delta-24-sterol reductase system in larvae of the tobacco hornworm similar to those previously observed with a number of azasteroids. Certain of the amines which are related structurally to compounds with juvenile hormone activity in insects also blocked development and metamorphosis in three other species of insects. These compounds are lethal or inhibit development in all larval stages and thus differ in action from compounds with juvenile hormone activity where the principal effect is to block the penultimate or ultimate molt.

Alcohol Oxidoreductases↗
PubMed1975

Inhibitive effects of structurally modified azasteroids and related nitrogen containing steroids on insect growth and development.

A number of azasteroids and other nitrogen containing steroids with a modified nucleus or side chain were prepared and tested for their inhibitory effects on the growth and development of several species of insects. Structure-activity studies showed that compounds with a structurally related steroid nucleus and side chain were approximately equal in inhibitory activity for a particular species. The replacement of the tertiary amino group in the side chain of the 5beta-steroid with other nitrogen substituents, such as nitro, cyano, acetylamino, or a quaternary ammonium salt, resulted in a considerable loss of inhibitive activity in the tobacco hornworm or the yellowfever mosquito. However, certain modifications of the azasteroid nucleus resulted in compounds that still retained high biological activity. As a result, a compound was synthesized that lacked the A and B rings of the steroid nucleus and that inhibited insect growth, molting, and metamorphosis and the delta24-sterol reductase enzyme system of the tobacco hornworm.

Aedes↗