Browsing by Author "Rakesh Kumar Pandey"

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Analytical solution of the Ornstein-Zernike equation for the structure factor of ordered plasmas using Sogami-Ise potential
(2004) Rakesh Kumar Pandey; Deep Narayan Tripathi
An analytic solution of Ornstein-Zernike (OZ) equation for the structure factor for plasmas has been obtained using Sogami-Ise (SI) potential amongst plasma particles that contains attractive tail at large distances. Pastore et al.'s criterion and a characteristic feature of the pair interaction potential have helped in reaching to the final expressions. The calculated structure factors compare well with that obtained by using Pastore et al.'s expressions derived with the Derjaguin, Landau, Verwey and Overbeek (DLVO) potential in case of H+-plasmas. The excess energy per particle and the values of the compressibility determined with the help of the calculated structure factors in the limit of momentum transfer becoming zero have been reported. © 2004 The Physical Society of Japan.
Comparison of structure factors and pair correlation functions obtained using coulomb attractive potential and screened coulomb potential for the suspended macroions
(Scientific Publishers, 2010) Rakesh Kumar Pandey; Deep Narayan Tripathi
The structure factors and pair correlation functions have been calculated for the macrolons suspended in water using coulomb attractive potential (CAP) and the results have been compared well with the results obtained from the RMSA and MMSA using screened coulomb potential (SCP). Differences among the values of compressibility in the limit of zero momentum transfer, excess energy per macroion and coordination number for both the potentials have been reported. Liquid like ordering of the FCC type has been obtained using both CAP as well as SCP potentials between suspended macroions. © 2010 IACS.
Induction of akinete formation in Nodularia spumigena by temperature
(1989) Rakesh Kumar Pandey
A synchronized akinete differentiation occurred within 3 days when Nodularia filaments were incubated at a higher temperature (32 ± 1 °C). Exogenous nitrogen and carbon compounds increased the akinete frequency. The cyanophycin content of akinetes was found to be nearly 6 times higher than that of exponentially growing vegetative cells. The results suggest that the akinete differentiation is induced by the rise in temperature and akinete frequency is regulated by cellular carbon and nitrogen levels. Copyright © 1989 Wiley‐VCH