Thesis Chapters by Ravi Singh
Papers by Ravi Singh
The Role of Central Bank in Crisis Management
SSRN Electronic Journal, 2000
Genomic prediction for grain zinc and iron concentrations in spring wheat
TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik, Jan 11, 2016
Predictability estimated through cross-validation approach showed moderate to high level; hence, ... more Predictability estimated through cross-validation approach showed moderate to high level; hence, genomic selection approach holds great potential for biofortification breeding to enhance grain zinc and iron concentrations in wheat. Wheat (Triticum aestivum L.) is a major staple crop, providing 20 % of dietary energy and protein consumption worldwide. It is an important source of mineral micronutrients such as zinc (Zn) and iron (Fe) for resource poor consumers. Genomic selection (GS) approaches have great potential to accelerate development of Fe- and Zn-enriched wheat. Here, we present the results of large-scale genomic and phenotypic data from the HarvestPlus Association Mapping (HPAM) panel consisting of 330 diverse wheat lines to perform genomic predictions for grain Zn (GZnC) and Fe (GFeC) concentrations, thousand-kernel weight (TKW) and days to maturity (DTM) in wheat. The HPAM lines were phenotyped in three different locations in India and Mexico in two successive crop season...
Effect of levels of farmyard manure and nitrogen fertilization on grain yield and use efficiency of nutrients in wheat (Triticurn aestivum)
The Indian Journal of Agricultural Sciences, Jul 5, 2005
... SINGH Ravindra ; AGARWAL SK ; Résumé / Abstract. A field experiment was carried out during th... more ... SINGH Ravindra ; AGARWAL SK ; Résumé / Abstract. A field experiment was carried out during the winter seasons of 1996-97 and 1997-98 on sandy-loam soils of Hisar, Haryana, to study the effect of organic and inorganic sources of nitrogen on productivity, profitability ...
Role of sowing time in the avoidance of stemfly (ophiomyia centrosematis) in garden pea
Indian Journal of Horticulture, 1990
Farm mechanisation revisited in North India
Eastern Economist, 1980
Transfering the Lr14a gene from bread wheat to durum and its expression against leaf rust
Revista Fitotecnia Mexicana, Mar 1, 2010
Applied Physics a Materials Science Processing, 2010
Tin dioxide nanoparticles and zinc oxide nanorods were synthesized chemically and thick film gas ... more Tin dioxide nanoparticles and zinc oxide nanorods were synthesized chemically and thick film gas sensors on alumina substrates were fabricated of these materials. Morphology and crystallite size of synthesized powders were investigated by TEM. The fabricated sensors were irradiated with 100 MeV O 7+ ions at fluences of 1 × 10 11 , 1 × 10 12 and 1 × 10 13 ions/cm 2 . The X-ray diffraction analysis of the samples before and after ion bombardment was performed for structural characterization. The sensing response to ethanol before and after irradiation was carried out for each fabricated sensor. Investigation revealed that irradiated SnO 2 based sensor's response and response time increased significantly. Results show that ZnO based sensor exhibit strong resistance to damage caused by ion irradiation which might be due to defects annihilation.
Pathogenicity variations of Puccinia recondita f. sp. tritici and P. graminis f. sp. tritici in wheat growing areas of Mexico during 1988 and 1989
Plant Disease, 1991
Different strategies for the synthesis of graphene/ZnO composite and its photocatalytic properties
Applied Physics a, Sep 1, 2013
ABSTRACT Owing to its unique physical and chemical properties, graphene has attracted tremendous ... more ABSTRACT Owing to its unique physical and chemical properties, graphene has attracted tremendous attention in the preparation of graphene-based composites for various applications. In this study, two different strategies have been developed to load zinc oxide (ZnO) nanorods onto reduced graphene oxide (RGO) sheets, i.e., in situ growth and a self-assembly approach. The microstructure and morphology of the synthesized RGO/ZnO nanocomposites was investigated by X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FESEM) and Brunauer–Emmett–Teller (BET) measurements. Fluorescence emission spectra (PL) of RGO/ZnO composites were performed to attribute quality of combination between RGO and ZnO. Significantly enhanced photocatalytic activity of RGO/ZnO nanocomposites in comparison to bare ZnO nanoparticles was revealed by the degradation of methylene blue under irradiation, which can be attributed to the inhibition of electron–hole pair recombination and enhanced adsorption due to the presence of RGO sheets.
Antioxidant activity and nutraceutical potential of some soybean varieties
Indian Journal of Agricultural Biochemistry, 2005
In order to find antioxidant activity and nutraceutical potential, seeds, leaves and pod pericarp... more In order to find antioxidant activity and nutraceutical potential, seeds, leaves and pod pericarp of nine varieties of Glycine max were analysed for their total phenolic contents (TPC), antioxidant activity (AOA) and free radical scavenging activity (FRSA). TPC showed ...
Optical Studies of Reduced Graphene Oxide Thin Films
ABSTRACT We report here a simple and efficient method for fabrication of reduced graphene oxide (... more ABSTRACT We report here a simple and efficient method for fabrication of reduced graphene oxide (rGO) thin films. Graphite oxide can be completely exfoliated to produce aqueous colloidal suspensions of graphene oxide (GO) sheets by simple ultra-sonication. Graphene oxide thin films were reduced towards graphene by exposure to hydrazine vapor, ammonia vapor and microwaves. The samples were characterized using X-ray diffraction (XRD) and UV-Visible spectroscopy (UV-Vis).
Regulatable Promoters for Use in Gene Therapy Applications: Modification of the 5'-Flanking Region of the CFTR Gene with Multiple cAMP Response Elements to Support Basal, Low-Level Gene Expression That Can Be Upregulated by Exogenous Agents That Raise Intracellular Levels of cAMP
Hum Gene Ther, 1996
This study focuses on the design, construction, and evaluation of a chimeric promoter for gene th... more This study focuses on the design, construction, and evaluation of a chimeric promoter for gene therapy applications where it is desirable to have low-level basal expression of the newly transferred gene, which can be induced to higher levels of expression by the administration of pharmacologic agents that can be safely used locally and/or systemically in humans. To achieve this, a chimeric promoter was constructed using fragments of the 5'-flanking region of the human cystic fibrosis transmembrane conductance regulator (CFTR) gene, and multiple tandem repeats of the consensus sequence and flanking elements of the cAMP response element (CRE), promoter sequences that support increased transcription in response to elevations in intracellular cAMP levels. Preliminary studies using plasmid vectors demonstrated that: (i) the 5'-flanking sequences from the CFTR gene have low promoter activity in the human airway epithelial cell lines; (ii) chimeras using -718 bp fragment from the 5'-flanking sequence of CFTR gene as the base, with the addition of 4-10 units of a 25-bp sequence containing the CRE consensus sequence, were all inducible by a rise in intracellular cAMP, with the chimera having eight CRE repeats the most responsive; and (iii) a CF126(CRE8) chjimera, consisting of the -126 bp fragment from the 5'-flanking region of CFTR gene together with eight CRE repeats, yielded low-level basal activity but maximal upregulation by cAMP, resulting in expression of the reporter gene that was 51-58% of an RSV-LTR control. On the basis of these observations, replication-deficient adenoviral vectors containing the CF126(CRE8) chimera and the luciferase reporter gene [AdCF126(CRE8).Luc] or the Escherichia coli lacZ (beta-Gal) reporter gene [AdCF126(CRE8). beta gal] were constructed. In several human airway epithelial cell lines, the AdCF126 (CRE). Luc vector provided low basal activity, but was significantly upregulated by agents that increase cAMP levels. Intranasal administration of the beta-Gal-expressing AdCF126(CRE8) beta gal vector into C57B1/6 mice demonstrated cAMP-induced upregulation of the reporter gene in airway epithelial cells. Quantification of the inducibility of the basal promoter activity in the airway epithelium using the AdCF126(CRE8). Luc vector demonstrated an 11-fold upregulation of the basal promoter activity in the lung with the administration of a phosphodiesterase inhibitor and a cAMP analog. These observations demonstrate the feasibility of using a chimeric promoter comprised of a minimal fragment of the CFTR 5'-flanking region, together with added multiple CRE, to control genes delivered in vivo. Importantly, because there are many drugs used in humans that raise cAMP, the concept of using a cAMP-regulatable promoter may also be a useful approach to enhance the safety, efficacy, and feasibility of a variety of human gene therapy strategies.
Journal of Non Crystalline Solids, 2009
Sensing response of 'self-binding' nanoparticles of tin dioxide powder deposited on alumina subst... more Sensing response of 'self-binding' nanoparticles of tin dioxide powder deposited on alumina substrate has been investigated. The nanocrystalline SnO 2 powder has been derived from stannic chloride. It has been prepared through fine crystallization in liquid phase. SnO 2 powder has been characterized using SEM, TEM and XRD techniques, which reveal that the average crystallite size is of 12 nm. The slurry blobs deposited on alumina substrate of the powder-thus-prepared have been studied for sensing response to ethanol at various temperatures and concentrations. The observations reveal that the material prepared is 'self-binding' and is very sensitive even without catalyst.
Manifestation of lattice distortions in the O is spectra in Ca1-xSrxRuO3
Solid State Communications, 2006
Fault Tolerance for Hypercube Networks Via Independent Spanning Trees
ABSTRACT
Biological Control Strategy of Uzi Fly in Sericulture
ABSTRACT
Evaluation of the Effect of Surfactants on the Movement of Pesticides in Soils Using a Soil Thin-Layer Chromatography Technique
Http Dx Doi Org 10 1080 10588330091134329, Jun 24, 2010
Setaria cervi: in vitro released collagenases and their inhibition by Wuchereria bancrofti infected sera
Journal of Helminthology, Mar 1, 2003
In vitro released products of adult Setaria cervi females, microfilariae and extracts showed cons... more In vitro released products of adult Setaria cervi females, microfilariae and extracts showed considerable amounts of collagenase activity. On the basis of per mg protein released in vitro, the products of both microfilariae and adult females exhibited comparable activity but this was much higher than that of extract of microfilariae and adult females. Two collagenase enzymes with molecular masses of 50 kDa and 70 kDa were separated using DEAE-sepharose CL6B and Sephadex G-100 column chromatography. The 50 kDa and 70 kDa collagenase exhibited pH optima of 5.2 and 7.0, respectively. Considering specific activity, the 50 kDa enzyme was found to contribute about ten times more collagenase activity as compared to the 70 kDa enzyme. An inhibition study revealed obvious differences between them. Thiol group inhibitors such as N-ethylmaleimide and leupeptin inhibited the 50 kDa enzyme but this was strongly activated by dithiothreitol, a thiol group stabilizer. Alternatively, the 70 kDa enzyme showed a sensitivity to a metal chelator and a serine group inhibitor indicating its metalloserine protease nature. The antifilarial drug diethylcarbamazine did not demonstrate any inhibition under in vitro conditions. Both enzymes were significantly inhibited by antibody IgG separated from Wuchereria bancrofti infected human sera, showing a possible immunoprotective role.
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Thesis Chapters by Ravi Singh
Papers by Ravi Singh