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Articles by Vajanti Mala Pahoja
Total Records ( 3 ) for Vajanti Mala Pahoja
  Mumtaz Ali Sethar , Vajanti Mala Pahoja and Qamaruddin Chachar
  The research work was conducted to elucidate the heat acclimation potential of two promising cotton cultivars Rehmani and S-12 . The plants were hardened for 1 to 7 days at 43ºC for 2h. After every hardening treatment the leaves were heat stressed at 45ºC for 2h. The chlorophyll fluorescence (Fv/Fm) ratio was recorded at pre-incubation, during heat stress and recovery after heat stress. The results showed that cv. Rehmani gave better results only after 1 day hardening treatment but after 2 to 7 days treatments the Fv/Fm ratio declined. However, cultivar S-12 showed good acclimation response as the treatment days were increased to 7-days hardening treatment the Fv/Fm ratio increased to 83% of the control treatment (no hardening).
  Vajanti Mala Pahoja and mumtaz Ali Sethar
  Lipases are widely distributed in plants, animals, insects and microorganisms. In plants, lipases are mostly present in food reserve tissues of growing seedlings especially in those which contain large amounts of triacylglycerols. In animals, the lipases are found in pancreas, and on the surface of mucous cells of the gastric mucosa. In insects, these enzymes are found mostly in plasma, salivary glands, muscles and fat bodies. Lipases are versatile group of enzymes that not only hydrolyze the esters of long chain aliphatic acids from glycerol at oil/water interface but also involved in the transesterification reaction. Lipases have preference to hydrolyze triacylglycerol, diacylglycerol and monoacylglycerol to glycerol and free fatty acids. The pH ranges of plant lipase is between 4.0 to 9.0 and of those animals between 5.5 to 8.5 and of microorganisms it ranges some what higher than other two groups i.e, 6.0 to 10.0. The temperature ranges at which plant lipase remain active is between 20 to 38°C and of animals it lies between 37 to 60°C. The microbial lipase temperature is between 37 to 55°C. The plant and animal lipase activate in the presence of calcium and zinc, while they in inhibit in the presence of EDTA, Triton X-100 and Tween 80. However, the microbial enzymes inhibit in the presence of FeCl3, ZnCl2 and HgCl2. The molecular weight of lipase in plants ranges between 19000 to 270000. While animal lipase ranges 43000 to 300000. The microbial lipase molecular weight lies between 32000 to 97000.
  Vajanti Mala Pahoja , M.Umar Dahot and Mumtaz Ali Sethar
  Lipase activity was assayed in mature Caesalpinia bonducella L. seeds using olive oil emulsion stabilized with 10% gum acacia as a substrate. The maximum lipase activity at pH 7.0 and at 30 EC and the pH stability was found in between 6-7.5. Lipase activity was fairly stable up to 60 EC and retaining 90% activity. Whereas lipase activity was completely lost at 90 EC within 10 minutes. C. bonducella L. seeds was found most specific towards coconut oil and lipase activity was slightly increased in the presence of calcium but enzyme activity was decreased by the addition of sodium deoxycholate, Tween 80 and Triton X-100.
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