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Bīkāner, India

Rawat S.,Dungar College | Srivastava M.,Dungar College
Journal of Entomological Research

Studies on the infestation of Callosobruchus chinensis Linn. raised from a pure line culture to assess the quantitative (seed damage and weight losses) and qualitative (biochemical) losses in three pulses showed a maximum seed damage of 96.15% in cowpea (Vigna radiata) followed by 88.44% in green gram (V. unguiculata) and (74.22%) in moth bean (Phaseolus aconitifolius) while highest weight loss was registered in green gram (48.13%) followed by moth bean (39.7%) and cowpea (18.6%). Biochemical analyses of damaged seeds after 20 and 40 days of infestation showed gradual increase of moisture content in all the three pulses with infestation. crude fat and crude fiber showed a similar trend of increase with infestation. Crude protien for the three pulses first increased after 20 days of infestation later showed slight decrease. However, total carbohydrate content of the three pulses showed decrease. Source

Sharma M.,Dungar College | Jangir O.P.,Dungar College | Jhajharia S.,Dungar College | Singh S.,Singhania University | And 2 more authors.
Indian Journal of Experimental Biology

Meshed pigmented iris epithelium along with neural retina of tadpoles of the frog Euphlyctis cyanophlyctis were found to undergo dedifferentiation and subsequently transdifferentiate into lens in culture medium. During lag period, depigmentation (dedifferentiation) occurred in many cells. When culture became confluent 3-4 weeks after seeding tiny lens like structures differentiated from foci of cultured pigmented iris epithelium cells. The percentage of lens formation was higher in vitamin A treated cases. The culture system appears to be a suitable for investigating the changes occurred during trans-differentiation of pigmented epithelial cells into lens. Source

Sharma K.S.,University | Bhargava N.,University | Jain R.,University | Goyal V.,University | And 2 more authors.
Indian Journal of Pure and Applied Physics

Superconductivity in MgB2 has been re-examined in BCS-Eliashberg framework by employing Mc-Millan's [Phys Rev, 167 (1968) 331] Inequation and form factors of MgB2 computed from the form factors of component metals (Model-I). The empty core model pseudopotential due to Ashcroft [Phys Lett, 23 (1966) 48] and random phase approximation form of dielectric screening due to Gellmann and Brueckner [Phys Rev, 106 (1958) 364] are used in the present work. An excellent agreement between the present values and other theoretically computed values of Tc and with the relevant experimental data for MgB2 confirms the validity of the present approach. The explicit dependence of λ and Tc on the isotopic masses of Mg and B, as revealed from the present work, confirms the role of lattice vibrations in the superconducting behaviour of MgB2 and the high value of Tc in it may be attributed to the phonon mediated e-e interaction coupled with higher values of phonon frequencies due to light mass of B atoms. It has also been observed that the pseudo-atom model (Model-II) with appropriate choice of the potential parameter rc successfully explains high value of T c. and isotope effect in MgB2, confirming the prominent role played by electron-phonon interaction in the high-Tc superconductivity observed in MgB2. The isotope effect exponent α-values obtained from the two models are in complete agreement with each other and the present value α = 0.46 is also much closer to the BCS value of 0.5. Interaction strength N0V values obtained from the two models are also in perfect agreement with each other and the present value N 0V = 0.48 suggests that MgB2 is a strong coupling superconductor. Source

Shekhawat M.S.,Dungar College | Tak S.K.,Dungar College | Mangal R.,Dungar College
AIP Conference Proceedings

This paper investigates the particle size distribution, chemical composition, fired modulus of rupture (MOR), and apparent porosity of blended clay utilizing clays available in Bikaner region and comparison with a imported Ukrainian clay. The blended clay B2 presents good white buff fired colour, higher fired modulus of rupture, and low porosity. The blend is suitable for Traditional Indian ceramic industries and a substitute of Ukrainian clay in India. © 2010 American Institute of Physics. Source

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