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Srivastava S.,Integral University | La'Verne S.J.,Lucknow Christian College | Khan I.A.,Integral University | Ali P.,Integral University | Gupta V.D.,Integral University
Journal of Applied Polymer Science | Year: 2011

Using Wilson's GF matrix method as modified by Higgs for an infinite system, we report normal modes and their dispersion for polyoxymethylene using the Urey-Bradley force field. Heat capacity has been evaluated as a function of temperature from dispersion curves via density-of-states. The results obtained agree well with the experimental data reported in the literature. © 2011 Wiley Periodicals, Inc.


La'Verne S.J.,Lucknow Christian College | Srivastava S.,Integral University | Gupta V.D.,Integral University
Journal of Polymer Science, Part B: Polymer Physics | Year: 2010

Normal mode analysis and their dispersion for poly(L-hlstidine) (PLH) are reported by using Urey Bradley force field and Fourier Transform IR PLH exists in the a helical form. There are 17 atoms in one residue, which gives rise to 51 dispersion curves. To simplify, it is convenient to discuss the normal frequencies under three separate heads namely amide modes, side chain modes, and mixed mode. The calculated frequencies are found to be in reasonably good agreement with the Fourier Transform IR spectra. There exists exchange of character, attraction, and repulsion for selective dispersion curves with change In the phase value. Contributions to the heat capacity were calculated separately for the side chain, backbone, and mixed modes. The major contribution comes from the side chain and mixed modes. The sum of these three contributions gives the total heat capacity, which Is in agreement with the reported experimental value. © 2009 Wiley Periodicals, Inc.


La'Verne S.J.,Lucknow Christian College | Srivastava S.,Integral University | Gupta V.D.,Integral University
International Journal of Biological Macromolecules | Year: 2010

Normal mode analysis and their dispersion for poly(l-isoleucine) are reported by using Urey Bradley force field and Fourier transform IR. The calculated frequencies are found to be in reasonably good agreement with the Fourier transform IRspectra. Experimental measurements reported by Wunderlich et al. also support the calculated specific heat variation of poly(l-isoleucine). © 2010 Elsevier B.V.


PubMed | Lucknow Christian College
Type: Journal Article | Journal: International journal of biological macromolecules | Year: 2010

Normal mode analysis and their dispersion for poly(L-isoleucine) are reported by using Urey Bradley force field and Fourier transform IR. The calculated frequencies are found to be in reasonably good agreement with the Fourier transform IRspectra. Experimental measurements reported by Wunderlich et al. also support the calculated specific heat variation of poly(L-isoleucine).


Singh N.S.,Lucknow Christian College | Phillips-Singh D.,Lucknow Christian College
Journal of Entomology | Year: 2010

The aim of this study was to study the genitalia of phlebotomidae sand flies for search of new species in various parts of India. The pattern of genitalia variation in phlebotominae sand flies also indicated that differences in the lengths of the spermathecal ducts and aedeagal filaments are distributed unevenly among closely related species. Mouth aspirators and small hand nets were used to capture phlebotominae sand flies form different localities. The results show that unlike most Diptera, including the other members of the family Psychodidae, the organs of sperm transfer in phlebotomines present a bipartite condition. The external genitalia of the male, consists of paired structures that grip the female during copulation and the internal genitalia of the female, consists of a common duct branching to paired individual ducts terminating in spermathecae. This study suggests that these characters can be used for identification of specimens where the spermathecae (an established tool for species identification in phlebotomines) have been lost or where cryptic species are concerned. © 2010 Academic Journals Inc.

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