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Recent Developments in Insect Neurohormones (Paperback, Softcover reprint of the original 1st ed. 1989)
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Recent Developments in Insect Neurohormones (Paperback, Softcover reprint of the original 1st ed. 1989)
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The most striking fact revealed by investigations of insect
neurohormones is that insects are as well supplied with
neurohormones as mammals, since neurohor mones regulate not only
the functioning of the endocrine glands, prothoracic gland, and
corpora allata, but also most physiological processes. Our
knowledge of neurohormones developed originally from anat
omocytological investigations and experimental studies. Today,
accurate bio assays have been devised for studying both in vivo and
in vitro physiological processes, and RIA determination has yielded
knowledge of titer modifications of humoral factors. Much is also
known about neurohormone purification, and several neurohormones
have even been identified in different species. Immunocytochemistry
has made it possible to demonstrate in their origin and release
sites the presence of insect neurohormones whose structure has been
elucidated. Moreover, the presence of vertebrate and invertebrate
neuropeptides has been demonstrated in insects. As regards biogenic
amines, methods of detection have been greatly refined and it is
now possible to identify the cell bodies and axons of the main
biogenic amines. Other new methods, such as cobalt chloride
impregnation or Lucifer yellow staining, have revealed the axonal
pathways and the location of particular neurons. The mechanisms of
action of neurohormones have been investigated in several cases and
the results of these investigations will be related in the chapters
which follow."
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