Biomedical subjects
Publications and source records attributed to G P Verma.
Dytiscus marginalis has a polytrophic ovariole and the maturing oocyte passes through 14 growth stages (S1-S14). Among these, S1-S10 are previtellogenic and S11-S14 vitellogenic stages. Structural changes in the nurse and follicular epithelial cells in relation to growth and maturation of the oocyte are described.
The male accessory reproductive glands of Acrida turrita includes fifteen pairs of tubules opening into the ejaculatory duct. Four of them are white and eleven hyaline glands. Histochemically the hyaline glands are further differentiated into seven types (HG1-HG7). The secretion of all the glands taken together includes polysaccharide (neutral mucopolysaccharide, chondroitin sulphate and sialomucin), protein (-NH2 and -SH groups, and tyrosine, histidine, tryptophan and arginine amino acids) and neutral lipid. The possible role of the accessory glands based on their histochemical analysis, has been speculated.
The male accessory gland of Oxya velox includes fourteen pair of tubules opening into the ejaculatory duct. Histochemically these tubules can be distinguished into six types (AG1--AG6). Their secretion is the mixture of polysaccharides (Glycogen, sialomucin and neutral mucopolysaccharides), proteins (-NH2 and SH groups, tyrosine, tryptophan, histidine and arginine) and lipids (neutral and phospholipids). The possible role of the accessory glands based on their histochemical analysis has been speculated.
Sarcophaga ruficornis can survive in the laboratory if given sugar and water but is not able to show any appreciable growth of the proximal oocyte. When meat is given in addition to sugar and water, either from the time of emergence or from the fourth day of emergence, tremendous increase in the length and volume of this oocyte is observed. The growth of the oocyte is comparatively greater in the mated flies than in the virgin ones. The possible influence of pheromones or other sex signals was eliminated by keeping controls in a room without males.
The histochemical tests have been performed to evaluate the polysaccharide and protein contents of the salivary gland of three insects with different feeding habits. Aspongopus janus (Hemiptera), Laccotrephes maculatus (Hemiptera) and larval Euprotis scintillans (Lepidoptera). While the salivary content of E. scintillans includes both acid (AMPS) and neutral (NMPS) mucopolysaccharides, that of A. janus and L. maculatus has only AMPS. The AMPS of E. scintillans and A. janus contains sulphated groups, while that of L. maculatus has carboxyl groups, weakly and/or non-sulphated groups. The histochemical tests for protein reveal the presence of protein-bound--SS,--SH and--NH2 groups and tyrosine-containing protein in the salivary content of all the insects under study. Besides, arginine- and histidine-containing protein has been detected in the gland of A. janus. The possible physiological significance of these histochemical constituents of the gland has been discussed.
Three categories of compound yolks are synthesized during vitellogenesis of Mylabris pustulata. CY1 bodies originate de novo and are composed of protein-carbohydrate (glycogen)-RNA complex. CY2 bodies originate from precursors in follicular epithelium and are composed of protein-carbohydrate (glycogen) complex. CY3 bodies originate from extraovarian precursors and are composed of protein-acid mucopolysaccharide-glycogen-phospholipid complex.
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