1,437 research outputs found
\u3cem\u3eArisaema agasthyanum\u3c/em\u3e Sivadasan & Sathish. (Araceae): A New Record for Tamil Nadu, India
Get PDFArisaema agasthyanum Sivadasan et Sathish., is recorded for the first time for Tamil Nadu from Tirunelveli Hills, Western Ghats, Tamil Nadu. India
Dynamics of coastal aquifers. Conceptualization and steady-state calibration of multilayer aquifer system-Southern coast of Emilia Romagna
Get PDFWorldwide, coastal aquifers have been heavily exploited by socio economic activities for several decades, and climate change and sea level rise have also been threatening coastal aquifers. The authorities and policymakers have been advised to find the solutions in order to achieve sustainable water resources management. The southern part of Po delta, Italy is a low-lying coastal area also experiencing tectonic activity. Along with low-lying topography, unstable shore line and sea level, the groundwater is heavily exploited by this deltaic multilayered system of aquifers. Hence, a multilayer three-dimensional model of this aquifer system has allowed for the investigation of the response of aquifer to natural and anthropogenic exploitation. The present work regards the conceptualization of the multilayer aquifer system using lithological cross-sections, surface water features, and appropriate boundary conditions and the steady-state flow modelling. The spatially distributed elevations of the groundwater table and piezometric head from the different aquifers have been calibrated. The values of model error statistics at a satisfactory range, such as R-squared, mean error, root-mean-squared error and model efficiency, confirm that the developed model is reliable, and calibration is obtained with good match between observed and simulated data. The developed model can be used as a decision-making tool for the authorities and policymakers in order to plan for sustainable water management
Assessment of seawater mixing in a coastal aquifer by high resolution electrical resistivity tomography
No full textSeawater intrusion is a major problem in urbanized coastal regions of India which is due to over exploitation of groundwater for various purposes. This study was carried out with the objective of assessing the zone of mixing between seawater and groundwater in the coastal aquifer in south of Chennai, Tamil Nadu, India using high resolution electrical resistivity tomography. High resolution electrical resistivity tomography was carried out in five profiles perpendicular to the sea using IRIS make SYSCAL Pro-96 system with 2.5 m or 5 m inter-electrode separation. The maximum length of the profile was 170 m which resulted in a depth of investigation of 28.7 m. The apparent resistivity measured in this area varies from 0.3 ohm-m to 30,000 ohm-m. The apparent resistivity of saturated zone decreases towards the sea, indicating the influence of seawater. This was also confirmed by measuring the electrical conductivity of groundwater, which gradually increases from 156 μS/cm to 3430 μS/cm towards the sea. Further, the concentration profiles of electrical conductivity, sodium, chloride and chloride / bicarbonate ratio are compared with the high resolution electrical resistivity tomography profile. The distance of influence of seawater is comparatively high in northern part than in southern part of the area. The high resolution electrical resistivity tomography was effectively used to determine the effect of seawater mixing with groundwater. © IRSEN, CEERS, IAU
Impacts of regional climate model projected rainfall, sea level rise, and urbanization on a coastal aquifer
No full textThe objective of this study is to assess the impact of climate change induced rainfall, sea level rise, and urbanization on a fragile coastal aquifer. This study was carried out in one such an aquifer located in Southeast India. Downscaled climate projection was carried out using the regional climate model (RCM) with seven ensembles and the best matching ensemble for the study area has been taken to quantify the rainfall in future. The changes in land use and land cover were estimated using remote sensing techniques, and background information on sea level rise at local and regional scale were investigated. Numerical simulation of groundwater in this isolated coastal aquifer was carried out to understand the responses of the groundwater level to downscaled projected rainfall, sea level rise, expected urbanization, and their combinations until the year 2050. The RCM-projected rainfall shows a decline in the groundwater level and shrinking of the freshwater lens. However, the prediction for change in the groundwater level combined with sea level rise minimizing a decline in the groundwater level. The rapid changes in land use and land cover pattern as inferred by change detection were extended and examined in the aquifer’s future characteristics by increasing and decreasing groundwater pumping with RCM-projected rainfall recharge and with sea level rise. The results without considering sea level rise show that the aquifer undergoes degradation even if pumping is reduced by 10%. The simulation with sea level rise shows that the aquifer behaves better in maintaining freshwater lens even with 10% increase in groundwater pumping. Sea level rise prevents the availability of the freshwater lens by reducing groundwater decline caused by the reduced RCM-projected rainfall and predicted groundwater demand. Huge variation and seasonal fluctuation in the volume of outflow to the sea is noticed between north and south. Also, reduced outflow against a range of sea level rise confirms that the sea level rise in the study area will lessen the volume of outflow, will reduce the groundwater decline, and will allow an increase in groundwater level. On the other hand, the shrinking of area will decrease the freshwater volume and occurrence of reduced groundwater gradient against sea level rise will increase the possibility of seawater intrusion to pumping. The present study confirms that even with RCM-projected decrease in rainfall recharge, the increase in the sea level will help to prevent groundwater decline in this aquifer by controlling an elevation of the groundwater level. Meanwhile, it is reducing the volume of freshwater and increasing the possibility of further seawater intrusion. Hence, it is recommended to reduce the groundwater pumping from this aquifer
Factors Influencing the Yield of Progenitor Cells in Bone Marrow Aspiration Concentrate—A Retrospective Analysis of 58 Patients
Get PDFThis study aims to identify the role of subjective factors (age, sex, and comorbidities) and procedure-specific factors (aspiration volume) in influencing the yield of progenitor cells in bone marrow aspiration concentrate (BMAC) harvested from the iliac crest. A retrospective analysis was conducted on 58 patients (male:female = 31:27; mean age: 52.56 ± 18.14 years) who underwent BMAC therapy between January 2020 and June 2021. The factors analyzed include individual factors such as age, sex, and comorbid conditions, and procedural factors such as aspirate volume. The mononuclear cell (MNC) count and colony-forming unit (CFU) assay were used to assess the yield of progenitors in the aspirate. Pearson’s correlation test was performed for the age, aspirate volume, and outcome parameters, such as MNC and CFU. We used the chi-square test to analyze the role of sex and comorbidities on cellular yield. The mean volume of aspirate used for BMAC therapy was 66.65 (±17.82) mL. The mean MNC count of the BMAC was 19.94 (±16.34) × 106 cells, which formed 11 (±12) CFUs. Evidence of statistically significant positive associations was noted between the CFUs developed from the BMAC and the MNC count within them (r = 0.95, p < 0.001). The sex of the individual did not play any significant role in MNC count (p = 0.092) or CFUs formed (p = 0.448). The age of the individual showed evidence of a statistically significant negative association with the MNC count (r = −0.681, p < 0.001) and CFUs (r = −0.693, p < 0.001), as did the aspiration volume with the MNC count (r = −0.740, p < 0.001) and CFUs (r = −0.629, p < 0.001). We also noted a significant reduction in the MNC count (p = 0.002) and CFUs formed (p = 0.004) when the patients presented comorbidities. Individual factors such as age, comorbid conditions, and procedure factors such as aspirate volume significantly affected the yield of progenitor cells in the BMAC. The sex of the individual did not influence the yield of progenitor cells in BMAC
PERIPHERAL OSSIFYING FIBROMA – A CASE REPORT
No full text*Dr. R. Aysha Sulthana R., Dr. Sivan Sathish, Dr. Christeffi Mabel, Dr. Kanmani Raju, Dr. Sai Archana and Dr. Priyadarshin
Early and late complications of endoscopic hemostatic techniques following different carotid artery injury characteristics
No full textAbstract not availableVikram Padhye, Rowan Valentine, Sathish Paramasivan, Camille Jardeleza, Ahmed Bassiouni, Sarah Vreugde and Peter-John Wormal
OPEN EDUCATIONAL PRACTICES FOR RESEARCH EFFECTIVENESS TO RESEARCH SCHOLAR
No full textThe current study conducted to determine the degree of efficacy of research scholars, and a significant difference was found concerning type in universities and experience. The sample included 525 research scholars researching state universities of Tamil Nadu. The tool used for the present study was the research scholar’s effectiveness Scale (RES). It was discovered that there is a modest degree of research scholar effectiveness among university-level research scholars. There is a significant difference found among the research scholars in their research effectiveness concerning the type of universities, and a significant difference is not found concerning the experience. It advised that research scholar’s effectiveness can be enhanced through various open educational resources, which can be made known to the university research scholars
Analysis of TF interactions with ribosome-nascent chain complexes-photocrosslinking and fluorescence spectroscopic approaches
Get PDFCharacterization of multi-layered impact damage in polymer matrix composites using lateral thermography
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