• R C Agnihotri

      Articles written in Pramana – Journal of Physics

    • Order-order transition in a macromolecular system—poly-L-proline I and II

      R C Agnihotri C Mehrotra V D Gupta Vandana Srivastava

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      Ising model formalism developed for order-disorder transition in poly-peptides has been modified for the study of order-order transition in a macromolecular system. A two-state theory is developed and applied to poly-L-proline I and II. Various transition curves for different chain lengths are obtained as a function of solvent composition. Transition curves and crossing point for a solvent system are in excellent agreement with the experimental data on poly-L-proline.

    • Fractional order phase transition in lipid bilayer: dipalmitoyllecithin

      R C Agnihotri C Mehrotra V D Gupta Vandana Srivastava

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      Dipalmitoyllecithin (DPL) shows an order ← → disorder pressure transition which is neither of first order nor of second order but can be treated as a fractional order (3/2 order) transition. The Ising model formalism is adopted for the study of such a system. A suitable equilibrium constant is defined which generates a 3/2 order transition. Transition curves are obtained and compared with the experimental curves of Liu and Kay. Reverse transition curves are also obtained and the system exhibits hysteresis effect. An approximate expression connecting transition pressures at different temperatures is obtained and the calculated and the experimental values are in good agreement.

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