UV emitting borate phosphors for phototherapy lamps

77-81Photoluminescence properties of UV and blue emitting borate phosphors prepared by simple and time saving combustion synthesis technique are presented and discussed in the context of application in phototherapy lamps. Emission characteristics of these phosphors are found to be similar to those of commercial lamp phosphors used for phototherapy

Performance Evaluation of Series DC-ES for DC bus Voltage Regulation on Different Non-Critical Loads and under FRT Support

DC microgrid is an assured distribution network for incorporating distributed renewable generations and electronic loads. Being an affordable power the installation of PV integrated DC microgrid are growing enormously which will bring new concerns about power system stability. Voltage stability has always been an issue in demand-supply management in DC microgrid. To effectively handle such instability issues new cost effective potential solutions are required. Earlier Electric Spring (ES) has been proposed as the solution to the load management, in the AC microgrids. This paper extends this concept to regulate the bus voltage fluctuation and Fault Ride Through (FRT) condition in DC microgrid by performing dynamically. The objective of the proposed work is to conserve power during generation intermittency by making non-critical loads to absorb less power and adaptively maintaining stable power across critical loads. DC Series Electric Spring (DC-ES) is different from existing technologies which is capable of real time demand side management (DSM). The problems in DC microgrid and their solution with the help of DC-ES have been successfully demonstrated on 48V DC grid for simulation verification using MATLAB environment. The results of DC electric spring show a good agreement with theoretical analysis

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Not AvailableThe present study investigates the genotoxicity of profenofos (PFF), an organophosphate pesticide in erythrocyte cells of freshwater fish, Channa punctata (Bloch) using micronucleus assay. The 96 h LC 50 value of PFF (50% EC) was estimated for the fish species in a semistatic system and then 50% of LC 50 was determined as 1.15 ppb. The fish specimens were exposed to 1.15 ppb sublethal concentration of the pesticide and samplings were done on 24, 48, 72 and 96 h post exposure for assessment of DNAby micronucleus assay. The study confirms that PFF is toxic for aquatic organism and the micronucleus assay is a useful tool in determining the potential genotoxicity and mutagenicity of xenobiotic compounds and can be considered as sensitive parameter for toxicity monitoring program.Not Availabl

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Not AvailableThe genotoxic and mutagenic potential of medicinal plant Jatropha gossypifolia, was investigated in fresh water fish Channa punctatus in the present study using micronucleus assay and comet assay. Fishes were exposed at 20% and 40% of the 24 h-LC50 value of plant extract containing Apigenin (76.48 mg L-1 ) and crude latex (22.33 mg L-1). Both the test chemicals induced significant (P<0.05) genotoxic effects in exposed fishes at various exposure durations. The micronucleus induction was maximum at the highest concentration (40%) 96 h post exposure of Apigenin containing extract (0.107%) and Jatropha crude latex (0.302%) in the peripheral blood of C. punctatus. A similar trend was observed for the DNA damage measured in terms of % tail DNA in the erythrocytes of C. punctatus in Apigenin containing extract (15.20%) and Jatropha crude latex (21.17%). This study also explored the combined use of micronucleus assay and comet assay for in vivo laboratory studies using fresh water fishes for screening the genotoxic potential of medicinal plants.University Grants Commission, New Delh

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Not AvailableThe aim of present study was to evaluate the mutagenicity and genotoxicity induced due to medicinal plant Euphorbia royleana crude latex in fresh water fish Channa punctatus using micronucleus and single cell gel electrophoresis (SCGE) assays. Two sub-lethal concentration of crude latex were calculated using 24 hrs LC50 value and the fish specimens were exposed to these concentrations in a static system. Erythrocytes were sampled at the intervals of 24, 48, 72 and 96 hrs at the rate of five fish per interval for assessment of micronucleus induction and SCGE assay. Significant effects (P<0.05) for both concentration and time of exposure were observed in treated fish. Highest level of micronuclei induction in erythrocytes and DNA damage in the SCGE was at 96 hrs of exposure at all concentrations of crude latex. This study further confirmed that the micronucleus and SCGE assays are useful to determine potential genotoxicity of herbal formulation and might be appropriate as part of monitoring program.University Grants Commission, New Delh

Synthesis and luminescence studies of novel rare earth activated lanthanum pentaborate

799-802The lanthanum pentaborate (LaB5O9)is a novel material which exhibits excellent luminescence when doped with rare earth ions. It was prepared by a novel technique which is a slight variation of solution combustion synthesis. The synthesis is based on the exothermic reaction between the fuel (urea) and oxidizer (ammonium nitrate). The structure of the prepared material was confirmed by powder XRD technique. The photoluminescence of rare earth ions (Ce3+, Eu3+) and sensitized luminescence of Gd3+(Pr3+-Gd3+ and Bi3+-Gd3+) in LaB5O9 have been studied. LaB5O9:Ce3+ shows broad band UV emission at 317 nm and LaB5O9:Eu3+ shows orange red emission. LaB5O9: Pr3+-Gd3+ and LaB5O9: Bi3+-Gd3+ exhibit efficient luminescence of Gd3+ in narrow UVB region at 310 nm. The material (La0.5 Pr0.4)B5O9:Gd0.1 exhibits intense narrow band UVB emission at 310 nm and could be a potential candidate for UVB phosphors used in phototherapy lamps

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Not AvailableDanio rerio, zebrafish, has been widely used as a non-mammalian vertebrate model organism in various studies. The present research describes to develop and characterize a new cell line from a wild strain Indian zebrafish native to Brahmaputra River, Assam, India. The new cell line designated as DRCF was developed from the caudal fin of D. rerio. The cell line was successfully subcultured up to 31 passages. Growth studies revealed that cell growth of DRCF was optimal at 28 °C in L-15 medium supplemented with 20% FBS. Molecular characterization of the DRCF cell line using mitochondrial genes namely cytochrome oxidase subunit I gene (COI) and 16S rRNA authenticated the true origin of the cell line. The chromosome analysis of the DRCF cell line expressed its 50 diploid chromosome number of D. rerio. The immunocytochemical characterization of the cell line exhibited its fibroblastic morphology. The expression of the green fluorescent protein (GFP) following transfection revealed the suitability of the cell line for transfection studies.Not Availabl