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Articles by S. Sankar
Total Records ( 4 ) for S. Sankar
  P. Venkatesh , K. Hariprasath , V. Soumya , M. Prince Francis and S. Sankar
  Aim of the study is to isolate, identify and evaluate the biologically active constituents present in the fruits of Durio zibenthinus Linn. The fresh fruit pulp of Durio zibenthinus Linn. were successively extracted by using various solvents like petroleum ether, chloroform, ethyl acetate and aqueous alcohol. The petroleum ether extract of the dried fruit pulp of the plant were subjected to isolation of phytoconsituents by counter current extraction and isolated compounds (β-Sitosterol and 3-β-hydroxy-21-Normethyl-19-vinylidenylursane) were partially characterized by using 1H NMR, 13C NMR and Mass spectroscopy. The petroleum ether extract and isolated compound (3-β-hydroxy-21-Normethyl-19-vinylidenylursane) were screened for aphrodisiac activity. The sexually active male mice were administered, the test or the solvent control doses, daily, orally, in their respective concentrations. The activities of male mice in each group were recorded individually for 60 min after 30 min of the drug administration on 1st, 7th and 14th day treatment including sperm count. In conclusion, out of the four extracts of the fruits of Durio zibenthinus Linn., Petroleum ether extract was subjected to isolation. From the above, two compounds were isolated. The 400 mg kg-1 b.wt. dose of petroleum ether showed significant aphrodisiac activity than all other treated dose of isolated compound (3-β-hydroxy-21-Normethyl-19-vinylidenylursane). Hence, this reveals that most herbs rely for their effects on variety of constituents. Further research is needed to identify biologically active constituents for fertility enhancing activity.
  S. Sankar and Sivanandham Daniel Srinivasan
  Dynamic Voltage Restorer (DVR) is a new concept of Flexible AC Transmission System (FACTS) controller with the unique capability for series compensation and power flow management among multi-line of a substation. The DVR employs a number of Voltage Sourced Converters (VSCs) linked at the same DC terminal, each of which can provide series compensation for the selected line of the transmission system. This study deals with simulation and implementation of DVR with open loop controlled systems. The hardware circuit of DVR was implemented.
  P. Soundarapandian and S. Sankar
  In recent years the use of probiotic bacteria in aquaculture has tremendous scope and the study of the application of probiotics in aquaculture has a glorious future. In the present study the probiotics, Silver-Ps was applied in culture ponds of Penaus monodon and was compared with control ponds (without probiotics). The salinity, pH, dissolved oxygen and temperature did not show significant difference between control and probiotics treated ponds. Average body weight, total production and survival rate of the ponds applied with probiotics were higher than that of control ponds. However feed conversion ratio was lower for the probiotics treated ponds than the control ponds. The shrimps in control ponds were seriously affected by bacterial infection; gill soaking and tail rot diseases. However, those problems are not encountered in probiotics applied ponds. The general conclusion obtained from the present study is that the probiotics plays a vital role in growth, survival and production of the shrimps by maintaining good water quality parameters through out the culture period.
  P. Soundarapandian and S. Sankar
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