Giant neurosecretory cells in the thoracic ganglion ofPotamon magnum magnum (Pretzman)

Zusammenfassung Im Thorax-Ganglion vonPotamon magnum magnum wurden neurosekretorische Riesenzellen mit oder ohne Axone nachgewiesen. Diese zeigen während des sekretorischen Zyklus eine extreme Modifikation der Kerngrösse. Die Neurosekret-Granula wandern in das Perikaryon oder in die Axone ein. Sowohl Kern wie Cytoplasma zeigen sekretorische Aktivität.     

Allatotropic activity of the median neurosecretory cells ofGalleria mellonella (lepidoptera) larval brain

Summary The brain allatotropic hormone (ATTH) is released inGalleria mellonella from the Median neurosecretory cells located in the pars intercerebralis. These cells show the ability to elicit supernumerary larval molts upon implantation into sensitive host larvae, and the ability to in vitro stimulate the juvenile hormone synthesis in corpora cardiaca-corpora allata glands ofG. mellonella.11 November 1986Acknowledgments. I am greatly indebted to Wesleyan University (Connecticut, USA) for supporting this study.     

The lateral neurosecretory cells and mating instinct in maleDysdercus koenigii (Hemiptera: Pyrrhocoridae)

Summary 5 pairs of median and 1 pair of lateral neurosecretory cell groups occur in the protocerebrum of maleDysdercus koenigii, a hemipteran pest on Hibiscus esculentus. The lateral neurosecretory cells (LNSC) are in a state of peak activity when the male engages itself in copulation. 24 h later, the LNSC are found to be inactive, but they again resume their activity 96 h after commencement of copulation. Such males soon start mating if they find another receptive female. It is believed that the secretion of LNSC in maleDysdercus koenigii is responsible for the onset of the urge for mating just as in female insects.     

Studies on the neurosecretory cells in the cerebral ganglion ofPotamon magnum magnum (Pretzman)

Zusammenfassung Mit der Gömöri-Technik ist es möglich, zwei Typen neurosekretorischer Zellen im zerebralen Ganglion vonPotamon magnum magnum (Pretzman) nachzuweisen. Der eine Zellentyp ist gross, oval oder vieleckig, besitzt vakuolisiertes Zytoplasma und einen grossen zentralen Kern. Der Kernmembran anliegend befindet sich eine Zone basophiler zytoplasmatischer Substanz (einige dieser Zellen enthalten Axone). Der andere Zellentyp ist klein, besitzt nur wenig Zytoplasma, jedoch ebenfalls einen grossen Kern. Diese Zellen lassen nur geringe neurosekretorische Tätigkeit erkennen. Die Neurosekret-Granula wandern in das Perikaryon oder in die Axone ein.     

Identification of actin microfilaments in the neurosecretory axons of rat neural lobe]

Incubation of rat neural lobes with heavy meromyosin (HMM) after prolonged glycerination, induced characteristic arrowhead decoration of a number of microfilaments at different levels of the neurosecretory axons. In non terminal sections of axons the labelled microfilaments showed preferential relationships with microtubules in addition to occasional contacts with the axolemma and various axonal organelles. In axonal endings, they were mainly associated to microvesicles and appeared to be anchored on the axolemma facing the perivascular space at the level of membranous densifications.     

Ontogenetic fate of the neurosecretory cells in the larval brain ofSarcophaga ruficornis (fabricius, 1794) (diptera: Cyclorrhapha)

Résumé Il y a quatre groupes, 1, 2, 3 et 4, de cellules neurosécrétrices dans chaque demi-sphère du cerveau larvaire duSarcophaga ruficornis. Pendant la métamorphose, les groupes 1 et 2 deviennent antérieurs dorsaux et forment des cellules neurosécrétrices médiales de la mouche adulte; le groupe 3 devient ventral mais s'évanouit après l'éclosion de la mouche; le groupe 4 s'évanouit aussi, mais plus tôt.     

Effect of temperature on the neurosecretory activity inNezara viridula Linn. (Heteroptera; pentatomidae)

Zusammenfassung Die neurosekretorischen Zellen und die davon ausgehenden Nerven vonNezara viridula Linn enthalten bei Zucht in niedriger Temperatur bedeutend weniger Neurosekret als in Normaltemperatur.     

Chromosome stabilizing structures in mitotic Indian muntjac (Muntiacus muntjak) cells1

Summary A new technique which removes all membranes, cytoskeletal elements, organelles, but preserves intact metaphase, anaphase and telophase configurations is combined with scanning electron microscopy (SEM) as an approach for direct visualization of chromosomal behavior in late mitosis. With this approach we are able to confirm the presence of a centromeric ring which stabilizes the centromeres during the cell cycle and present evidence for a lattice-like sheet of interchromatidic fibers in late mitosis.Supported by the National Institute of Health Grant CA32572 to L. D. Hodge.     

Radioimmunoassay of an invertebrate peptide hormone - the crustacean neurosecretory hyperglycemic hormone.

Antibodies against hyperglycemic hormone (CHH) of Carcinus were raised in rabbits by injection of extract from sinus glands which contain high concentrations of CHH. The antiserum neutralizes the biological activity of CHH and binds 125-J-CHH. A RIA for CHH was established and was used to measure the hormone content of sinus glands.     

Demonstration of acidophilic neurosecretory cells in Crepidula fornicata Phil. (Mollusca, Gasteropoda, Prosobranchia) using the fluorescent dye, Geranine G]

The Fluorochrome Geranine G binds to acidophilic neurosecretory cells and produces red orange fluorescence. Chromolipids and pigments show green fluorescence. This method is easy and sensitive. Fluorescence fading during irradiation is low.     

An analytical study of the neurosecretory cells of the brain inPhilosamia ricini (Hutt.) (Lepidoptera: Saturniidae) during post-embryonic development

Summary A multiplicity of types of neurosecretory cell (NSC), and uniformity in the numbers occurring in medial, lateral, posterior and tritocerebral groups, have been observed inP. ricini. 3 types of cells A, B and C, with their subtypes (A-1, A-2, A-3; B-1, B-2; C-1 and C-2) have been reported. Only B-cells increase in numbers during post-embryonic development. Others (A and C) remain constant throughout development. Abnormal staining behaviour of A-cells has also been reported.Acknowledgements. We are grateful to Prof. S.D. Misra for the facilities and to the UGC, New Delhi, for sanctioning a grant No. F. 23-781/78 (SR II) dated 27.4.78 to Dr V.B. Awasthi, which is gratefully acknowledged.     

On the significance of the rostral process of bipolar neurosecretory cells in the caudal neurosecretory system of certain catfishes

Summary Neurosecretory substance has been identified in the rostral process of bipolar neurosecretory cells of the caudal neurosecretory system in 4 Indian catfishes, using acid violet stain. The role of the rostral process in the transmission of the neurosecretory substance is discussed.We thank Prof. U.S. Srivastava, Allahabad University, for laboratory facilities and useful suggestions. The U.G.C. financial assistance under the Faculty Improvement Programme, to one of us (H.C.S.) is gratefully acknowledged.     

On the significance of the rostral process of bipolar neurosecretory cells in the caudal neurosecretory system of certain catfishes

Neurosecretory substance has been identified in the rostral process of bipolar neurosecretory cells of the caudal neurosecretory system in 4 Indian catfishes, using acid violet stain. The role of the rostral process in the transmission of the neurosecretory substance is discussed.     

On the activity of neurosecretory cells in the flesh-flySarcophaga bullata

Résumé L'activité des cellules neurosécretrices dans le cerveau de la femelle deSarcophaga bullata est en corrélation avec le développement des larves dans la femelle et leur position.