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Somatostatin-like immunoreactivity has been demonstrated in cells of the gastro-entero-pancreatic endocrine system of Xenopus laevis (Amphibia) using peroxidase-anti-peroxidase immunohistochemistry. The identified cells of the gastro-intestinal tract correspond to the "Open-Paraneurons" of FUJITA (1974). Somatostatin-immunoreactive cells were found in the(More)
The biosynthesis of the peptides caerulein and PGLa in granular skin glands of Xenopus laevis proceeds through a pathway that involves discrete morphological rearrangements of the entire secretory compartment. Immunocytochemical localization of these peptides during gland development indicates that biosynthetic precursors are synthesized in intact secretory(More)
Two distinct neurons located paramedially within the suboesophageal ganglion of female Australian crickets Teleogryllus commodus were shown to contain Arg8-vasopressin-like immunoreactivity. Immunostained processes project throughout the ganglion. They pass the circumoesophageal connectives, and finally they branch out and enter the neurohemal region of the(More)
Ovariectomy, performed immediately after the final hatch, caused a reduction of stainable (neurosecretory?) material in the paramedial neurosecretory cells (PNC) (A-type) of the suboesophageal ganglion in 10 day-old females of Teleogryllus commodus (Walk.). A concomitant increase in nuclear volume and in the incorporation of 35S-cysteine indicates increased(More)
Untersuchungen fiber die hormonale Steuerung der Ausbildung der beim Generationswechsel der heterogonen Gallmficke Heleropeza pygmaea WINN1~RTZ 1846 (Diptera: Cecidomiidae) auftretenden Eitypen dutch die larvalen Ovarien einer weiblichen Larve zeigten: Die Larveneier entstehen und reifen dutch einen hormonalen Faktor, der vom retrocerebralen Drt~senkomplex(More)