Biological Institute, Faculty fo Science, Nagoya University, Chikusa-ku, Nagoya 464, Japan;Department of Agricultural Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
Abstract:
Blockage of adult development by brain removal and its resumption by application of the prothoracicotropic hormone (PTTH) were studied using pupae of a racial hybrid J-122 × C-115 of Bombyx mori . A log-linear dose-response relationship was obrained after injection of a PTTH solution. The Bombyx -unit of PTTH has been defined from this dose-response curve.