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Articles by R. Sathishkumar
Total Records ( 3 ) for R. Sathishkumar
  M.C. Harish , S. Rajeevkumar and R. Sathishkumar
  The present study was conducted to formulate single rapid in vitro callus induction and regeneration system for six different commercially important tomato cultivars of India. This study was done as a pre-requisite for the genetic manipulation studies to enrich vitamin E in tomato, which is ongoing research in the group. The varieties in this study include Sindhu and Shalimar (high altitude hybrid varieties), CO3, PKM, Vaishnavi and Ruchikar are hybrid varieties which are widely cultivated in the different agro climatic regions of India. Effect of the hormones, NAA (Naphthalene Acetic Acid), IAA (Indole Acetic Acid) in combination with BAP (Benzyl Amino Purine) and Kin (Kinetin) at varying concentrations were investigated on callus induction frequency. The varying concentrations of BAP were tested for regeneration capacity in all the cultivars. The highest frequency compact of callus formation was up to 90% for all the cultivars in 0.5 mg L-1 NAA+2 mg L-1 of BAP and regeneration was significantly higher with 3 mg L-1 BAP for all the cultivars. Hence, from this study, we could conclude that even though there are genotypic differences among the cultivars, common media and hormonal concentration can be used for the callus induction and for plant regeneration. In future, these results will be very useful for all the tomato genetic engineering studies.
  R. Sathishkumar and C. Ramesh
  Black hole attack is a serious security problem to be solved for active delivery of packets of data in Mobile Ad-Hoc networks. In this problem, a malicious node uses routing protocol to promote itself as having the shortest path to the node whose packets it wants to snatch. In flooding based protocol, if the malicious node reply reaches the requesting node before the reply from the actual node, a fake route is created and try to send the packets of data. This research study deals with the presentation of preventing black hole attack in Mobile Ad Hoc Network (MANET).Various prevention techniques have been discussed in the study that are used to prevent black hole attack. Mobile Ad Hoc networks are susceptible to various attacks, so attacks have to be mitigated in initial setup.
  R. Sathishkumar , P.T.V. Lakshmi and A. Annamalai
  The Total Phenolic Content (TPC) and antioxidant activity of fresh and dried materials of Enicostemma littorale Blume were evaluated using the Folin-ciocalteau method, 2, 2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging activity and Ferric Reducing Antioxidant Power (FRAP) assays. Different drying treatments especially, microwave treated plant material led to significant reduction (p≤0.05) in antioxidant properties of E. littorale in methanolic extracts as compared to that of the boiling water extracts, which appeared to exhibit significantly stronger antioxidant potentials (p≤0.05) even in dried plant materials due to greater solubility of compounds, breakdown of cellular constituents as well as hydrolysis of tannins. A strong free radical scavenging activity in the chosen plant material suggests that it has great potential in the food industry as functional food ingredient.
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