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Articles by A. Umamaheswari
Total Records ( 3 ) for A. Umamaheswari
  P. Tamilmani , A. Umamaheswari , A. Vinayagam and B. Prakash
  Chicken feather is recognized as a solid waste generated from poultry farms and is abundant in Namakkal district, Tamilnadu, India. Feather is commonly treated by high temperature and pressure; it is used as animal food stuffs. However, feather degradation by biological methods has been increasingly interested because of environmental awareness. In this study, unidentified bacterial strains isolated from soil samples. They had show ability of feather degradation by making a clear zone around their colonies in FMA medium. The zoned isolates were identified by morphological and biochemical tests. The Bacillus licheniformis were also examined for keratinase production by shake flask fermentation in a basal medium containing 1% feather. The fermentation mediums were optimized. Fermentation process was carried out at 37°C for 7 days at 150 rpm. Crude keratinase were extracted and purified by salt precipitation, dialysis and column chromatography and measured the activity of keratinase.
  A. Umamaheswari and V. Lalitha
  The present study was aimed to develop a novel protocol for the in vitro induction of callus for the production of capsaicin from Capsicum annuum L. For callus production young leaves, growing shoots, nodal region from the sterile germinated seedlings and placental regions and pericarp tissue from the fruit pods were used as explants. They were cultured on MS Medium supplemented with the various combinations of GA, IAA, NAA, 2, 4-D and Kin. Of all tried combinations of growth hormones, MS Medium with 2.0 mg L1 2, 4-D and 0.5 mg L1 Kin was producing significant callus induction and proliferation in placental explants. The placental callus extract was taken for the estimation of capsaicin by colorimetric method. Extract had 1.6 mg1 of capsaicin g1 fresh weight of the callus. This could be an efficient protocol for capsaicin production from the placental calli and used for the large scale commercial production of capsaicin.
  A. Vinayagam , N. Senthilkumar and A. Umamaheswari
  Mosquitoes are vectors of etiologic agents of malaria, filariasis and viral disease. Anopheles stephensi Liston (Diptera) is the primary vector of malaria in India and other West Asian countries and improved methods of control are urgently needed. In the present investigation the effect of certain plants on the larval mortality, biology and biochemical parameters of Anopheles stephensi were studied. Ten medicinal plants were collected, dried and extracted with methanol and used for the present study. Out of ten plants tested 100% mortality of Anopheles stephensi was observed in four plants namely Albizia amara, Areca catechu, Leucas aspera and Ocimum sanctum after 24 h treatment. The pupation and adult emergence was appeared to be dose dependent (1, 3 and 5% of extracts). The treated larvae showed reduction in the levels of carbohydrate, DNA and RNA when compared to the control which proved that the vector management is possible by using different medicinal plants. The medicinal plants were easily biodegradable than the synthetic insecticides, the plant products are less hazardous; they afford a rich storehouse of chemicals of diverse biological activities.
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