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Application of biotechnology for genetic improvement of tea(Camellia sinensis L.)
Tapan K. Mondal 한국차학회 2003 한국차학회지 Vol.9 No.3
Tea is one of the most important non-alcoholic beverage drinks worldwide. Although conventional breeding and propagation contributed significantly for last several decades to improve this crop. Moreover, tea is a unique horticultural crop which not only grow as monoculture but also the tender shoots and foliage harvested at periodic intervals from the very second year after planting to 100 or more years. Thus tea plant experiences several biotic and abiotic stresses through out the life. Therefore application of biotechnology become attractive to overcome the limitations of conventional breeding coupled with the demand for increasing productivity with lower cost of production. The various approaches such as microproopagation, genetic transformation and molecular biology which are applied to the Indian tea cultivar are discussed here.
Antihepatotoxic Activity of Cassia tora Leaf Extract
Tapan K. Maity,Subhash C. Mandal,M. Pal,B. P. Saha 한국생약학회 1998 Natural Product Sciences Vol.4 No.4
Methanolic extract of Cassia tora leaves was evaluated for its hepatoprotective activity in rats by inducing hepatotoxicity with paracetamol (acute model). The extract at a dose of 400 ㎎/㎏ orally exhibited significant protective effect by lowering the serum levels of transaminase (SGOT and SGPT), bilirubin, and alkaline phosphatase (ALP). The effects produced were comparable to that of a standard hepatoprotective agent.
Tapan Kumar Mandal,Biswa Priya Dutta,Shiben Chandra Debnath,Animesh Kumar Chakraborty 대한수의학회 2004 Journal of Veterinary Science Vol.5 No.1
Pharmacokinetics of cefotaxime (50mg/kg, i.m.) were studied in both healthy and kidney damaged female black Bengal goats. Uranyl nitrate (0.75mg/kg) was administered intravenously, once daily for fiv consecutive days to induce kidney damage. The pharmacokinetic variables were calculated in both cases. Kidney damage caused several changes in the determined variables. The Cmax and Cmin of cefotaxime observed at 0.50 and 5 h in normal goats were 24.91 ± 1.51 and 1.22 ± 0.07 μg/ml, respectively, while the same in kidney damaged goats at 1 and 72 h were 75.00 ± 0.45 and 3.10 ± 0.09 μg/ml, respectively. Renal damage condition significantly increased t1/2,ka (0.48 ± 0.01 h), t1/2,ke (20.03 ± 0.16 h), AUC (2440.10 ± 24.26 μg. h/ml) and significantly decreased Vdarea (0.59 ± 0.007L/kg), Vss (0.58 ±0.007 L/kg) and ClB (0.02 ± 0.008 L/kg/h) values of cefotaxime compared to normal goats.
Tapan K.Ghosh,Tarun K.Paul,Sudipto Haldar 대한수의학회 2005 Journal of Veterinary Science Vol.6 No.1
Black Bengal bucks (Capra hircus) were supplemented with 0, 0.2 or 0.4 mg elemental chromium (Cr) as chromium chloride hexahydrate per day for 70 days. Intake of dry matter (p < 0.001), crude protein (p < 0.001) and neutral detergent fiber (p < 0.01)increased due to Cr supplementation. The apparent total tract digestibility of dry matter (p < 0.01), organic matter (p < 0.05), crude protein (p < 0.001) and acid detergent fiber (p < 0.01) improved and the total body weight gain and the live weight gain to feed intake ratio also increased (p < 0.001) due to supplemental Cr feeding. The intake and apparent absorption (p < 0.001) of Cr was enhanced due to its supplementation. The intake of copper, zinc, manganese and iron was also more (p<0.001) in the Cr supplemented bucks. As supplementation progressed, plasma glucose concentration was elevated particularly in 0.4 mg Cr supplemented bucks and a significant day x dose interaction effect (p < 0.001) with this parameter. The activity of plasma alkaline phosphatase increased (p < 0.001) and that of glutamate pyruvate transaminase in plasma decreased (p < 0.01) in the Cr supplemented bucks. Supplemental Cr had minimal (p > 0.05) effect on the plasma half life (k) and clearance rate of glucose (T1/2)during an intravenous glucose tolerance test. Area under the response curve from 0 to 180 minutes after glucose loading was lower (p < 0.001) in the control group of bucks. The study revealed that Cr supplementation might promote growth and nutrient utilization in black Bengal bucks. However, little difference between the 0.2 and 0.4mg Cr supplemented bucks suggested limited benefit of increasing the level of supplementation beyond 0.2 mg per day under the normal management regimes.
Dynamical analysis of a plant-herbivore model : bifurcation and global stability
Tapan Saha,Malay Bandyopadhyay 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.19 No.1-2
The first part of the paper deals with a brief introduction of the plant-herbivore model system along with deterministic analysis of local stability and Hopf-bifurcations. The second part consists of stability analysis of the limit cycle arising from Hopf-bifurcation and uniqueness of limit cycle. The third part deals with the study of global stability of the model system under consideration.