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CHANGES IN TITER OF THE BRAIN HORMONE DURING DEVELOPMENT OF THE SILKWORM, BOMBYX MORI
Author(s) -
ISHIZAKI HIRONORI
Publication year - 1969
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1111/j.1440-169x.1969.00001.x
Subject(s) - titer , bombyx mori , moulting , thorax (insect anatomy) , biology , abdomen , endocrinology , medicine , hormone , pupa , juvenile hormone , larva , anatomy , immunology , biochemistry , botany , antibody , gene
A bstract Changes in titer of brain hormone (BH) extracted from the brain, head, and thorax and abdomen during the development of Bombyx mori from the 4th larval molting up to 6 days after adult emergence were investigated. The hypothesis is presented that high secretory activity of the brain is not reflected in a corresponding change in its BH titer, while low secretory activity brings about an accumulation of BH in the brain. An interesting finding is that extremely high titers of BH were found in the thorax and abdomen, from 4 days after pupation to adult emergence, of females only. This sexual difference was, however, not found in all of the races examined.