http://nopr.niscair.res.in/handle/123456789/14121 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/14132 Title: Nitric oxide alleviates oxidative damage induced by high temperature stress in wheat <br/> <br/>Authors: Bavita, A; Shashi, B; Navtej, S B <br/> <br/>Abstract: Effect of sodium nitroprusside (SNP), a donor of nitric oxide (NO) was examined in two wheat (<i style="">Triticum aestivum</i> L.) cultivars, C 306 (heat tolerant) and PBW 550 (comparatively heat susceptible) to study the extent of oxidative injury and activities of antioxidant enzyme in relation to high temperature (HT) stress. HT stress resulted in a marked decrease in membrane thermostability (MTS) and 2, 3, 5-triphenyl tetrazolium chloride (TTC) cell viability whereas content of lipid peroxide increased in both the cultivars. The tolerant cultivar C 306 registered less damage to cellular membranes compared to PBW 550 under HT stress. Activities of antioxidant enzymes viz, superoxide dismutase, catalase, ascorbate peroxidase, guaicol peroxidase and glutathione reductase increased with HT in both the cultivars. Following treatment with SNP, activities of all antioxidant enzymes further increased in correspondence with an increase in MTS and TTC. Apparently, lipid peroxide content was reduced by SNP more in shoots of heat tolerant cultivar C 306 indicating better protection over roots under HT stress. The up-regulation of the antioxidant system by NO possibly contributed to better tolerance against HT induced oxidative damage in wheat. <br/> <br/>Page(s): 372-378 Sat, 28 Apr 2012 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/14131 Title: Effect of temperature on behavioural isolation : A study with <i style="">Drosophila ananassae </i>populations <br/> <br/>Authors: Yadav, Sujata; Yadav, Anand Kumar <br/> <br/>Abstract: Experiments were conducted to study sexual isolation among two natural populations of <i style="">Drosophila ananassae</i> maintained at 18 °C and 24 °C for 12 generations in the laboratory to see the effect of this environmental variable on behavioural isolation. Multiple choice technique was used and matings were observed directly in Elens Wattiaux mating chamber. Results showed sexual isolation among strains that were maintained at different temperatures, indicating that temperature may have affected the mating behaviour of the flies which resulted in the induction of ethological isolation among the strains. <br/> <br/>Page(s): 366-371 Sat, 28 Apr 2012 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/14130 Title: Antitumor potential of <i style="">Castanopsis indica</i> (Roxb. ex Lindl.) A. DC. leaf extract against Ehrlich's ascites carcinoma cell <br/> <br/>Authors: Dolai, Narayan; Karmakar, Indrajit; Kumar, R B Suresh; Bala, Asis; Mazumder, U K; Haldar, Pallab Kanti <br/> <br/>Abstract: Methanol extract of <i>C</i>.<i> indica</i> (MECI) leaves showed direct cytotoxicity on Ehrlich ascites carcinoma (EAC) cell in a dose dependant manner and there was significant decrease in the tumor volume, viable cell count, tumor weight and elevated the life span of EAC tumor bearing mice. Hematological profile and biochemical estimations were significantly restored to normal levels in MECI treated as compared to EAC control mice. MECI treatment significantly modulated the tissue antioxidant assay parameters as compared to the EAC control mice. The results revealed that MECI possesses significant dose dependent antitumor potential which may be due to its cytotoxicity and antioxidant properties. <br/> <br/>Page(s): 359-365 Sat, 28 Apr 2012 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/14129 Title: Antihyperglycemic activity of <i>Woodfordia fruticosa</i> (Kurz) flowers extracts in glucose metabolism and lipid peroxidation in streptozotocin-induced diabetic rats <br/> <br/>Authors: Verma, Neeraj; Amresh, G; Sahu, P K; Rao, Ch V; Singh, Anil Pratap <br/> <br/>Abstract: The ethanolic extract of <i>W. fruticosa </i>flowers (250 and 500 mg/kg) significantly reduced fasting blood glucose level and increased insulin level after 21 days treatment in streptozotocin diabetic rats. The extract also increased catalase, superoxide dismutase, glutathione reductase, glutathione peroxidase activities significantly and reduced lipid peroxidation. Glycolytic enzymes showed a significant increase in their levels while a significant decrease was observed in the levels of the gluconeogenic enzymes in ethanolic extract treated diabetic rats. The extract has a favourable effect on the histopathological changes of the pancreatic β- cells in streptozotocin induced diabetic rats. The results suggest that <i style="">W. fruticosa</i> possess potential antihyperglycemic effect by regulating glucose homeostasis and antioxidant efficacy in streptozotocin-induced diabetic rats. <br/> <br/>Page(s): 351-358 Sat, 28 Apr 2012 22:58:59 GMT