• R Sarojini

      Articles written in Proceedings – Animal Sciences

    • Histochemistry of the ovary ofMacrobrachium kistnensis

      R Sarojini M S Mirajkar R Nagabhushanam

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      The ova ofMacrobrachium kistnensis are characterized by the presence of perinuclear glycogen spherules and peripheral proteid yolk. The ovarian epithelium is rich in neutral mucopolysaccharides. The vitellogenic oocytes filled with yolk globules and granules are rich in corbohydrates and lipids.

    • Seasonal variations and the role of neurosecretory hormones on the androgenic gland of the prawnMacrohrachium lamerrii

      R Sarojini G Gyananath

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      The androgenic gland ofM. lamerrii is situated near the seminal vesicle and along the vas deferens of the male prawns. Histologically it is made up of cords of cells which are arranged loosely. Histochemical analysis of the androgenic gland cells showed the presence of cystine/cysteins, protein bound amino acid groups. Androgenic gland ofM. lamerrii shows signs of increased secretory activity during the sexually active phase of the male. In adult prawns, eyestalk ablation results in the hypertrophy of androgenic gland. Brain and thoracic ganglion extracts also showed enhanced secretory activity of androgenic gland and corresponding gonadal activity in the male prawns.

    • Pheromonal and hormonal control of reproduction in the freshwater prawn,Macrobrachium kistnensis

      R Nagabhushanam P R Machale R Sarojini

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      In the freshwater prawnMacrobrachium kistnensis reared with males, the ovarian development occurred normally, whereas it was delayed in the absence of males. Testis and vas deferens extracts when added to the water in which females are being reared brought about normal development of ovary in comparison to those which were reared in boiled water or ‘female water’ alone. Therefore, mature males appear to be producing a pheromone which is necessary for the ovarian development of the female and the source of this might be vas deferens or testis. On the other hand, the central nervous tissue extracts stimulated vitellogenesis in oocytes. In particular, the brain extracts were more effective than those of thoracic ganglion in inducing this response. Thus, in the present study ovarian maturation and vitellogenesis appear to be under the pheromonal and hormonal controls.

    • Isolation of neurosecretory hyperglycemic hormone from the eyestalks of freshwater crab,Barytelphusa cunicularis

      R Nagabhushanam P R Machale R Sarojini

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      A procedure is described for the purification of neurosecretory hyperglycemic hormone from the eyestalks of freshwater crab,Barytelphusa cunicularis. This procedure involved a combination of gel filtration on Sephadex G-50 and a subsequent preparative polyacrylamide gel electrophoresis which revealed that hyperglycemic hormone moved faster than other proteins.

    • Tributyltin oxide induced alterations in exuvial weight and calcium content of the prawn,Caridina rajadhari

      R Nagabhushanam P S Reddy R Sarojini

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      Moulting is the predominent feature of crustaceans. Cyclic cuticle deposition and resorption of calcium from old cuticle occur in relation to the crustacean moult cycle. Prolonged exposure of the prawn,Caridina rajadhari to media containing sublethal doses (0·015, 0·020, 0·025 and 0·040 ppm) of tributyltin oxide led to an apparent increase in dry weight of exuvia as well as an increase in the total quantity of calcium. The increase in weight and calcium content of exuvia was not significant in the initial two moults whereas it was significant (P<0·05) in the third moult when exposed to minimum (0·015 ppm) dose. However significant (P<0·01) rise in both exuvial weight and calcium quantity in the first two moults and highly significant (P<0·001) in the third moult exuvia were observed when exposed to maximum (0·040 ppm) dose. The observed changes in exuvia from prawns exposed to tributyltin oxide might be due to a decrease in the resorption of the old cuticle and/or due to the inhibition of chitinolytic enzymes.

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