A note on the fowler's solution of the lane-emden equation of index 3

Zusammenfassung FürFowler's Lösung der Lane-Emden-Gleichung von Index 3 wird der Gültigkeitsbereich erweitert.     

Tissue specific biochemical alterations prior to spinning in the eri-silkworm,Philosamia ricini

Summary Silkgland, fatbody, hemolymph and midgut of eri-silkworm present tissue specific turnover in their biochemical correlates in preparation for spinning of the cocoon which is followed by larval-pupal transformation.Acknowledgment. The authors are thankful to Dr R. N. Singh, Principal, for providing the necessary facilities, to Dr A. B. Das, Zoology Dept. Visvabharti University for valuable suggestions and to Indian Council of Agricultural Research, New Delhi, India, for financial assistance.     

Respiratory burst in peritoneal exudate cells in response to a modified tuftsin.

Intraperitoneal administration of tuftsin-M [Thr-Lys-Pro-Arg-NH-(CH2)2-NH-CO-C15H31] to Balb/C mice has been shown to induce a respiratory burst in the peritoneal exudate cells. The macrophages exhibited enhanced levels of O2-, H2O2, NADPH oxidase and myeloperoxidase, but the activities of superoxide dismutase, catalase and glutathione peroxidase remained virtually unchanged. The magnitude of the oxidative burst depended directly on the dose of tuftsin-M; higher activity was observed at higher doses of the peptide. Tuftsin-M enhanced the generation of both O2- and H2O2 under in vitro conditions, as did phorbol myristate acetate. These results suggest that tuftsin-M could enhance non-specific defence against infections by activating the macrophages.     

Thyroid activity in response to some gonadal steroids in methallibure-treatedHeteropneustes fossilis (Bloch)

Summary Methallibure treatment is as effective as hypophysectomy in reducing thyroid activity inH. fossilis. Sex steroids (TP and EB) administration restored thyroid activity in methallibure-treated females to normal level, but failed to elicit any response in males. This drug seems to block TSH secretion and thyroid hormone synthesis inH. fossilis.Financial assistance in the form of SRF from ICAR, New Delhi to one of us (R.B.R.), gift of methallibure from ICI Ltd., UK and TSH from NIH, USA, to T.P.S. are gratefully acknowledged.     

Effect of nodal water potential on the germination of sugarcane buds

Zusammenfassung Das Keimen der Zuckerrohr-Achselknospen wurde als vom Knotenwasserpotential beeinflussbar beobachtet. Die Sprossentwicklung erfolgte noch bei so geringem Wasserpotential wie 1063,6 Joule/kg und selbst bei Fehlen jeglicher Wasseraufnahme. Ausgeschnittene Knospen mit einem Wasserpotential von 1063,5 bis 1823,4 Joule/kg konnten nur im Wasser gehalten austreiben, während ein Wasserpotential von 2026,0 Joule/kg tödlich war.     

Mutagenecity in the mal regions ofEscherichia coli

Résumé L'efficacité de la nitrosoguanidine (MNG) dans différents milieux de culture et tampons a été étudiée. Les résultats obtenus montrent qu'avec le temps, la fraction de cellules survivant au traitement diminue progressivement alors que la fréquence de mutation augmente dans tous les milieux. L'activité de cet agent atteint un maximum dans le milieu DM-glucose tandis que dans le tampon TM elle est à son plus bas niveau.