Shyam Yadav | IIT Kharagpur (original) (raw)
Papers by Shyam Yadav
Pramana-journal of Physics, Jan 1, 1983
Sample of cellulose nitrate (Russian) is exposed to 1840Ar ions. The bulk etch rate has been stud... more Sample of cellulose nitrate (Russian) is exposed to 1840Ar ions. The bulk etch rate has been studied at different etching temperatures and the activation energy for bulk etch rate has been calculated. The etched track lengths are measured for different etching times. The energy loss rate and range of 1840Ar ions in CN(R) is also calculated. The critical threshold value for etchable track in CN(R) is determined by comparing the theoretical and experimental values of track length. The response curve of CN(R) is also presented.
... Singh and Hari Ram 8. Rhizobium Management and Nitrogen fixation 127 David L. McNeil and Mich... more ... Singh and Hari Ram 8. Rhizobium Management and Nitrogen fixation 127 David L. McNeil and Michael Materne 9. Nutrient and Irrigation Management 145 BA McKenzie, M. Andrews ... Abiotic Stresses 315 Michael Materne, David L. McNeil, Kristy Hobson and Rebecca Ford 20. ...
Tetrahedron Letters, Jan 1, 2007
Aryl propargylic methanols undergo C- and O-nucleophilic substitution reactions in the presence o... more Aryl propargylic methanols undergo C- and O-nucleophilic substitution reactions in the presence of a catalytic amount of iodine in short reaction times with good yields.
Archives of Biochemistry and Biophysics, Jan 1, 2004
Ribosome-inactivating proteins having antitumor and immunomodulatory properties constitute the ac... more Ribosome-inactivating proteins having antitumor and immunomodulatory properties constitute the active principle of widely used mistletoe therapy in Europe. This is the first report of the four isoforms of Himalayan mistletoe ribosome-inactivating proteins (HmRips) from Viscum album parasitized on wild apple inhabiting NW Himalayas. HmRips were purified by affinity chromatography and four isoforms were separated by ion-exchange chromatography. HmRip 1, 2, 3, and 4 have isoelectric points of 6.6, 6.1, 5.2, and 4.7, respectively. Disulfide linked toxin and lectin subunits of HmRip 1 and 2 isoforms have molecular weights of 28 and 34 kDa while those of HmRip 3 and 4 have 28 and 32 kDa. The isoforms lacked blood group specificity and showed positive activity with seven mammalian erythrocyte types but did not show any activity with avian erythrocyte type. Lectin activity of HmRips remained unchanged for a wide range of temperatures (0–65 °C) and pH (3–9). Unlike other type II Rips, the HmRip 1, 2, and 4 showed unique affinity towards l-rhamnose, meso-inositol, and l-arabinose while HmRip 3 has specificity to gal/galNAc. Sugar binding studies with 22 sugars also suggested that the C-4 hydroxyl of galactose might be the critical site involved in sugar binding of HmRips. Type II Rips are known to be galactoside specific and do not have affinity for l-rhamnose and meso-inositol. However, HmRip 1, 2, and 4 having equal affinity for galactose and l-rhamnose do not strictly fit into any of the four structural classes of the lectins and represent a new class of type II Rips and plant lectins.
Applied Radiation and Isotopes, Jan 1, 1995
A comparative study of various stopping power formulations have been made by comparing the calcul... more A comparative study of various stopping power formulations have been made by comparing the calculated stopping power values with the corresponding experimental values for different projectiles, e.g. U, Pb, Au, Xe, Mo, Kr, Cu, Ca, Ar, P, O, N, Li etc. in different targerts, e.g. Be, C, Al, Si, Ti, Ni, Cu, Zr, Ag, Ta, Au, Bi, U, (CH)n, Mylar, Hostaphan etc. at various energies (≈ 3–400 MeV/n). It has been observed that the Hubert et al. formulation provides results in best agreement with the experimental results for all projectile and target combinations in this energy domain.
Archives of Agronomy …, Jan 1, 2010
Australian journal of …, Jan 1, 2005
Salinity is one of the major environmental constraints affecting agriculture in major regions of ... more Salinity is one of the major environmental constraints affecting agriculture in major regions of the world. It is known to depress greatly the growth and symbiotic performance of nodulated legumes. In the present study conducted over 2 rabi (dry) seasons, 200001 and ...
Field Crops Research, Jan 1, 2006
In order to investigate specific and general adaptation of chickpea in India, a wide range of sub... more In order to investigate specific and general adaptation of chickpea in India, a wide range of sub-continental, Australian and Mediterranean genotypes were grown across seven sites characterizing the major chickpea growing areas over 3 years, and extensive data on plant stand, early vigour, phenology, productivity and yield components collected. High and low yielding sites were clearly separated by a range of physical and biological characters, low yield being associated with low latitude and pre-season rainfall, high temperature, early phenology, short crop duration, low biomass and fecundity. Genotype by environment interactions for yield were highly significant (P < 0.001), and accounted for more variance than that attributed to genotypes alone. Ward's hierarchical clustering indicated that the genotypes could be separated into discrete groups, comprising material specifically adapted to the north (Clusters 2 and 3) or south (Cluster 5), widely or consistently poorly adapted germplasm (Clusters 1 and 4, respectively).Cluster 5, comprising germplasm from southern and central India, was characterized by early phenology, confirming the role of drought escape in southern India. With increasing latitude Cluster 5 genotypes remained early, but had the capacity to delay maturity considerably, resulting in average, and occasionally above average yields. However, compared to well-adapted material in the north, Cluster 5 biomass was low, and the time interval between flowering and podding up to 50 days, representing repeated cycles of flowering and subsequent abortion. Clusters 2 and 3, dominated by northern Indian genotypes, were characterized by later phenology, and were able to delay the onset of flowering significantly more than the remaining germplasm at late flowering northern sites. In Cluster 3, the second highest yielding group overall, this increased both source and sink potential at productive northern sites. Cluster 2 was uniformly later than Cluster 3, and lower yielding at most sites. Cluster 1 was characterized by intermediate flowering and relatively early, responsive maturity, a phenological compromise responsible for wide adaptation, by providing sufficient drought escape in the south, and enough biomass in the north to produce above average yields in these contrasting environments. ICCV 10 from the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), and 2 Indian Agricultural Research Institute (IARI) lines, BG 391 and BG 1006, were the most consistently high yielding, ranking in the top 10 at 10 and 8 sites, respectively. Cluster 4, comprising largely Australian cultivars, was characterized by late, unresponsive phenology and the lowest yield at each site.
Pramana-journal of Physics, Jan 1, 1983
Sample of cellulose nitrate (Russian) is exposed to 1840Ar ions. The bulk etch rate has been stud... more Sample of cellulose nitrate (Russian) is exposed to 1840Ar ions. The bulk etch rate has been studied at different etching temperatures and the activation energy for bulk etch rate has been calculated. The etched track lengths are measured for different etching times. The energy loss rate and range of 1840Ar ions in CN(R) is also calculated. The critical threshold value for etchable track in CN(R) is determined by comparing the theoretical and experimental values of track length. The response curve of CN(R) is also presented.
... Singh and Hari Ram 8. Rhizobium Management and Nitrogen fixation 127 David L. McNeil and Mich... more ... Singh and Hari Ram 8. Rhizobium Management and Nitrogen fixation 127 David L. McNeil and Michael Materne 9. Nutrient and Irrigation Management 145 BA McKenzie, M. Andrews ... Abiotic Stresses 315 Michael Materne, David L. McNeil, Kristy Hobson and Rebecca Ford 20. ...
Tetrahedron Letters, Jan 1, 2007
Aryl propargylic methanols undergo C- and O-nucleophilic substitution reactions in the presence o... more Aryl propargylic methanols undergo C- and O-nucleophilic substitution reactions in the presence of a catalytic amount of iodine in short reaction times with good yields.
Archives of Biochemistry and Biophysics, Jan 1, 2004
Ribosome-inactivating proteins having antitumor and immunomodulatory properties constitute the ac... more Ribosome-inactivating proteins having antitumor and immunomodulatory properties constitute the active principle of widely used mistletoe therapy in Europe. This is the first report of the four isoforms of Himalayan mistletoe ribosome-inactivating proteins (HmRips) from Viscum album parasitized on wild apple inhabiting NW Himalayas. HmRips were purified by affinity chromatography and four isoforms were separated by ion-exchange chromatography. HmRip 1, 2, 3, and 4 have isoelectric points of 6.6, 6.1, 5.2, and 4.7, respectively. Disulfide linked toxin and lectin subunits of HmRip 1 and 2 isoforms have molecular weights of 28 and 34 kDa while those of HmRip 3 and 4 have 28 and 32 kDa. The isoforms lacked blood group specificity and showed positive activity with seven mammalian erythrocyte types but did not show any activity with avian erythrocyte type. Lectin activity of HmRips remained unchanged for a wide range of temperatures (0–65 °C) and pH (3–9). Unlike other type II Rips, the HmRip 1, 2, and 4 showed unique affinity towards l-rhamnose, meso-inositol, and l-arabinose while HmRip 3 has specificity to gal/galNAc. Sugar binding studies with 22 sugars also suggested that the C-4 hydroxyl of galactose might be the critical site involved in sugar binding of HmRips. Type II Rips are known to be galactoside specific and do not have affinity for l-rhamnose and meso-inositol. However, HmRip 1, 2, and 4 having equal affinity for galactose and l-rhamnose do not strictly fit into any of the four structural classes of the lectins and represent a new class of type II Rips and plant lectins.
Applied Radiation and Isotopes, Jan 1, 1995
A comparative study of various stopping power formulations have been made by comparing the calcul... more A comparative study of various stopping power formulations have been made by comparing the calculated stopping power values with the corresponding experimental values for different projectiles, e.g. U, Pb, Au, Xe, Mo, Kr, Cu, Ca, Ar, P, O, N, Li etc. in different targerts, e.g. Be, C, Al, Si, Ti, Ni, Cu, Zr, Ag, Ta, Au, Bi, U, (CH)n, Mylar, Hostaphan etc. at various energies (≈ 3–400 MeV/n). It has been observed that the Hubert et al. formulation provides results in best agreement with the experimental results for all projectile and target combinations in this energy domain.
Archives of Agronomy …, Jan 1, 2010
Australian journal of …, Jan 1, 2005
Salinity is one of the major environmental constraints affecting agriculture in major regions of ... more Salinity is one of the major environmental constraints affecting agriculture in major regions of the world. It is known to depress greatly the growth and symbiotic performance of nodulated legumes. In the present study conducted over 2 rabi (dry) seasons, 200001 and ...
Field Crops Research, Jan 1, 2006
In order to investigate specific and general adaptation of chickpea in India, a wide range of sub... more In order to investigate specific and general adaptation of chickpea in India, a wide range of sub-continental, Australian and Mediterranean genotypes were grown across seven sites characterizing the major chickpea growing areas over 3 years, and extensive data on plant stand, early vigour, phenology, productivity and yield components collected. High and low yielding sites were clearly separated by a range of physical and biological characters, low yield being associated with low latitude and pre-season rainfall, high temperature, early phenology, short crop duration, low biomass and fecundity. Genotype by environment interactions for yield were highly significant (P < 0.001), and accounted for more variance than that attributed to genotypes alone. Ward's hierarchical clustering indicated that the genotypes could be separated into discrete groups, comprising material specifically adapted to the north (Clusters 2 and 3) or south (Cluster 5), widely or consistently poorly adapted germplasm (Clusters 1 and 4, respectively).Cluster 5, comprising germplasm from southern and central India, was characterized by early phenology, confirming the role of drought escape in southern India. With increasing latitude Cluster 5 genotypes remained early, but had the capacity to delay maturity considerably, resulting in average, and occasionally above average yields. However, compared to well-adapted material in the north, Cluster 5 biomass was low, and the time interval between flowering and podding up to 50 days, representing repeated cycles of flowering and subsequent abortion. Clusters 2 and 3, dominated by northern Indian genotypes, were characterized by later phenology, and were able to delay the onset of flowering significantly more than the remaining germplasm at late flowering northern sites. In Cluster 3, the second highest yielding group overall, this increased both source and sink potential at productive northern sites. Cluster 2 was uniformly later than Cluster 3, and lower yielding at most sites. Cluster 1 was characterized by intermediate flowering and relatively early, responsive maturity, a phenological compromise responsible for wide adaptation, by providing sufficient drought escape in the south, and enough biomass in the north to produce above average yields in these contrasting environments. ICCV 10 from the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), and 2 Indian Agricultural Research Institute (IARI) lines, BG 391 and BG 1006, were the most consistently high yielding, ranking in the top 10 at 10 and 8 sites, respectively. Cluster 4, comprising largely Australian cultivars, was characterized by late, unresponsive phenology and the lowest yield at each site.