<div> <div> <div> <p>A systematic analysis of the hydration structure of Cs+ ions in solution is derived from simulations carried out using a series of molecular models built upon a hierarchy of approximate representations of many-body effects in ion-water interactions. It is found that a pairwise-additive model, commonly used in biomolecular simulations, provides poor agreement with experimental X-ray spectra, indicating an incorrect description of the underlying hydration structure. Although the agreement with experiment improves in simulations with a polarizable model, the predicted hydration structure is found to lack the correct sequence of water shells. Progressive inclusion of explicit many- body effects in the representation of Cs⁺-water interactions as well as account for nuclear quantum effects is shown to be necessary for quantitatively reproducing the experimental spectra. Besides emphasizing the importance of many-body effects, these results suggests that molecular models rigorously derived from many-body expansions hold promise for realistic simulations of aqueous solutions. </p> </div> </div> </div>

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Pp. xv plus 675. Illustrated. Price, 25s. Obtainable from Oxford University Press, Bombay and Calcutta This monograph is a lucid exposition of modem neurophysiology. The different chapters deal with the structure and functions of the different regions of the nervous system. Each chapter begins with historical notes and concludes with a detailed summary of the

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