The effects of ethyl, n-propyl, and n-butyl carbamate on the respiration of blocked (diapause) and active (postdiapause) grasshopper embryos have been studied. The three compounds are essentially similar in their narcotic action. The oxygen consumption of active embryos is depressed approximately 50 per cent (to the diapause level) by 0.25 M ethyl carbamate or 0.025 M n-butyl carbamate. The blocked embryo is depressed only 10 per cent. The rates of oxygen consumption expressed as cu. mm. oxygen per embryo per hour for morphologically similar blocked and active embryos show that concentrations up to 0.025 M n-butyl carbamate have a slight stimulating effect on diapause respiration but reduce the respiration of the active embryo to the diapause level. In concentrations of 0.025 M and greater, both active and blocked embryos are depressed to the same rate of oxygen consumption. Reversible concentrations of carbamates are antagonized completely by 12.5 x 10-5M methylene blue, the oxygen uptake of narcotized postdiapause embryos being restored to its normal level, and the narcotized diapause embryo being stimulated to the postdiapause level. The dinitrophenol stimulated respiration of both active and blocked embryos is antagonized by the carbamates.
Proceedings of the Iowa Academy of Science
©1939 Iowa Academy of Science, Inc.
Everett, Guy M.
"The Effects of Homologous Carbamates on the Respiratory Metabolism of Blocked and Active Embryos,"
Proceedings of the Iowa Academy of Science, 46(1), 444-445.
Available at: https://scholarworks.uni.edu/pias/vol46/iss1/132