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Positronium Fraction and Positron Life Time at Ni(110) and Ge(110) Surfaces

100%

Shrivastava S., Gupta V.

Acta Physica Polonica A

1991

vol. 79

issue 6

853-859

The fraction of positronium formation and the positron lifetime at Ni(110) and Ge(110) surfaces, when low-energy positrons incident on them, have been calculated using the rate equations approach and positron trapping in image potential well. The calculated results are compared with the available experimental results. The positronium fraction is overestimated at high temperatures in case of Ni(110).

Theoretical study of structure, vibrational and electronic spectra of isomers of methyl-3-methoxy-2-propenoate

81%

Virdi A., Gupta V., Sharma A.

Open Chemistry

2004

vol. 2

issue 3

456-479

A systematic quantum mechanical study of the possible conformations, their relative stabilities, vibrational and electronic spectra and thermodynamic parameters of methyl-3-methoxy-2-propenoate has been reported for the electronic ground (S0) and first excited (S1) states using time-dependent and time-independent Density Functional Theory (DFT) and RHF methods in extended basis sets. Detailed studies have been restricted to the E-isomer, which is found to be substantially more stable than the Z-isomer. Four possible conformers c′Cc, c′Tc, t′Cc, t′Tc, of which the first two are most stable, have been identified in the S0 and S1 states. Electronic excitation to S1 state is accompanied with a reversal in the relative stability of the c′Cc and c′Tc conformers and a substantial reduction in the rotational barrier between them, as compared with the S0 state. Optimized geometries of these conformers in the S0 and S1 states are being reported. Based on suitably scaled RHF/6-31G** and DFT/6-311G** calculations, assignments have been provided to the fundamental vibrational bands of both these conformers in terms of frequency, form and intensity of vibrations and potential energy distribution across the symmetry coordinates in the S0 state. A complete interpretation of the electronic spectra of the conformers has been provided.

QTL mapping of 1000-kernel weight, kernel length, and kernel width in bread wheat (Triticum aestivum L.)

52%

Ramya P., Chaubal A., Kulkarni K., Gupta L., Kadoo N., Dhaliwal H. S., Chhuneja P., Lagu M., Gupta V.

Journal of Applied Genetics

2010

vol. 51

issue 4

421-429

Kernel size and morphology influence the market value and milling yield of bread wheat (Triticum aestivum L.). The objective of this study was to identify quantitative trait loci (QTLs) controlling kernel traits in hexaploid wheat. We recorded 1000-kernel weight, kernel length, and kernel width for 185 recombinant inbred lines from the cross Rye Selection 111 ? Chinese Spring grown in 2 agro-climatic regions in India for many years. Composite interval mapping (CIM) was employed for QTL detection using a linkage map with 169 simple sequence repeat (SSR) markers. For 1000-kernel weight, 10 QTLs were identified on wheat chromosomes 1A, 1D, 2B, 2D, 4B, 5B, and 6B, whereas 6 QTLs for kernel length were detected on 1A, 2B, 2D, 5A, 5B and 5D. Chromosomes 1D, 2B, 2D, 4B, 5B and 5D had 9 QTLs for kernel width. Chromosomal regions with QTLs detected consistently for multiple year-location combinations were identified for each trait. Pleiotropic QTLs were found on chromosomes 2B, 2D, 4B, and 5B. The identified genomic regions controlling wheat kernel size and shape can be targeted during further studies for their genetic dissection.

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1 Acta Physica Polonica A

1 Journal of Applied Genetics

1 Open Chemistry

1 2010

1 2004

1 1991

3 Gupta V.

1 Chaubal A.

1 Chhuneja P.

1 Dhaliwal H. S.

1 Gupta L.

1 Kadoo N.

1 Kulkarni K.

1 Lagu M.

1 Ramya P.

1 Sharma A.

1 Shrivastava S.

1 Virdi A.

Search results

Positronium Fraction and Positron Life Time at Ni(110) and Ge(110) Surfaces

Theoretical study of structure, vibrational and electronic spectra of isomers of methyl-3-methoxy-2-propenoate

QTL mapping of 1000-kernel weight, kernel length, and kernel width in bread wheat (Triticum aestivum L.)