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Articles by R. Selvakumar
Total Records ( 3 ) for R. Selvakumar
  S. Gunasekaran , S.M. Ramasamy , K. Palanivel , J. Saravanavel and R. Selvakumar
  The developmental index and the developmental planning of a Country/Nation mostly depend on its natural resources potential including water resources. The emerging of Remote Sensing and GIS has substantially reduced the problems of groundwater targeting in various aquifer systems. The groundwater aquifer system in Pudukkottai district is distinctly controlled by western crystalline, central Tertiary sandstone and eastern Quaternary sediments. While the groundwater behavior in crystalline is dominantly controlled by secondary porosity, in Tertiary formation and Quaternary sediments, it is controlled by the primary porosity. The analysis of groundwater levels of 1975, 1985 and 1995 under the 3D GIS environment and their integrations show that the groundwater system in Pudukkottai district is also controlled by the major tectonic features deduced from tectonic and fluvial geomorphological anomalies. The groundwater domes and basins are alternatively aligned in NW-SE direction in western crystalline segment and the groundwater ridge and valley is found in tertiary formation shows the N-S alignment. The groundwater ridge aligned along Gandavarvakkottai-Alangudi indicates that the groundwater movements obstructed by the upliftment of Mio-Pliocene sandstone in between the two N-S faults. The alternatively arranged groundwater ridge and valley in western crystalline are dominantly controlled by the NW-SE major lineaments/faults. The present study revealed that groundwater aquifer system in this region is also controlled by the tectonic grains.
  R. Selvakumar , U.A.B. Rajasimman and S. Gunasekaran
  In South India, tanks system is quiet ancient, meant for storing and supplying water towards multifunctional needs of the people. In Tamil Nadu, there are around 39,000 tanks with varying size and types. Over past few decades, irrigation rely on stable and reliable groundwater resources like dug and deep bore wells, consequently tanks lost their significance. Moreover, excessive siltation, improper maintenance and illegal encroachment further degraded the system. The deterioration factors are broadly categorised into problems in catchment, feeder channels and head works, eventually resulting in loss of storage capacity. The present study chiefly narrates an indirect method of estimating loss in storage capacity of tanks and the catchment problem, especially soil erosion and its induced downward siltation using geoinformatics technology. Using remotely sensed satellite data by measuring surface area of tank loss in storage capacity was estimated through a model relationship. Using Digital Elevation Model derived topographic wetness indices data, the catchment problem especially, soil erosion areas are identified and remedial measures are suggested. Under prevailing water crisis, it is essential to rehabilitate the tanks through which the surface water potential can be improved subsequently the groundwater quality and quantity will be enhanced.
  R. Kannangai , A. J. Kandathil , D. L. Ebenezer , E. Mathai , A. J. Prakash , O. C. Abraham , T. D. Sudarsanam , S. A. Pulimood , R. Selvakumar , V. Job and G. Sridharan
  In developing countries, the usability of peripheral blood constituents that are low-cost alternatives to CD4-positive (CD4+) T-cell and human immunodeficiency virus type 1 (HIV-1) RNA estimation should be evaluated as prognostic markers. The aim of our study was to investigate the use of plasma levels of dehydroepiandrosterone sulfate (DHEAS), albumin, and C-reactive protein (CRP) as alternate prognostic markers for antiretroviral treatment (ART) response in place of HIV-1 load measurements. Paired blood samples were collected from 30 HIV-infected individuals before and after initiation of ART, 13 HIV-infected individuals before and after completion of antituberculosis therapy (ATT), and 10 HIV-infected individuals not on either ATT or ART. Because of the nonavailability of samples, the CRP estimation was done for samples from only 19, 9, and 8 individuals in groups 1, 2, and 3, respectively. The measurements of all three markers, i.e., DHEAS, albumin, and CRP, were carried out with commercial assays. The differences in the albumin levels before and after ART or ATT were significant (P < 0.05), while the differences in DHEAS and CRP levels were not significant (P > 0.05). When levels of DHEAS among the individuals who were followed up were analyzed, 13 (44.8%) in the ART group and 9 (69%) in the ATT group showed an increase following treatment. Prior to treatment of HIV-infected individuals, there was a significant positive correlation of CD4+ T-cell counts and a negative correlation of viral load with albumin and DHEAS levels (P < 0.01). Among the three plasma markers we tested, plasma albumin and, to some extent, DHEAS show promise as prognostic markers in monitoring HIV infection.
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