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Ionic Hydration in aqueous alkali from density and compressibility values
No full textThe adiabatic compressibility of aqueous solutions of some alkali halides has been determined as a function of both concentration and temperature. A simple two-state model of solutions which retain the Gurney [Ionic Processes in Solution (Mc Graw-Hill, New York, 1953)] concept of water coordination shells and their overlapping as the salt concentration increases has been employed to interpret the data. The alkali halides examined show a consistent pattern for the size and compressibility of hydration shells as a function of ionic radius
Microscopic theoretical calculation of critical exponents in classical fluid mixtures
No full textWe show in this paper that microscopic theoretical approaches can be applied with confidence for the determination of phase stability conditions both of model and real multicomponent classical fluid mixtures. We examine the performances of two theories, namely the Mean Spherical Approximation (MSA) and the Hypernetted Chain (HNC) approximation by comparing their results with those of computer simulation and with the available experimental evidence. The two theories agree qualitatively with each other; moreover the MSA, though inconsistent as a theory from the thermodynamic point of view, is capable to predict in a very direct, and rapid manner the essential qualitative features of the phase diagrams of both neutral and charged fluids. Calculations for the critical exponents are reported in such a context, by showing that the MSA approach allows an accurate determination of these quantities and that the result obtained are consistent with the previous literature
Adaptive and evolutionary characters inferred from an endocranial cast of nesolutra trinacriae Burgio & Fiore, an endemic otter of the sicilian middle-upper pleistocene
No full textThe paper describes the results of a morphological analysis conducted on the brain obtained from a skull of Nesolutra trinacriae Burgio & Fiore, 1988. The skull, which was discovered at Poggio Schinaldo, Cinisi (province of Palermo, Sicily), was associated with a vertebrate fauna ascribed to the Midd1eUpper Pleistocene.
The endocranial characters relating to evolution of the sensory area projection in the Sicilian species were compared with those of numerous fossil and living lutrines. The comparison showed that the Sicilian species had a significant expansion of its coronai gyrus, similar to the one of Lutra and thus mainly due to a remarkabie sensitivity of its faciai vibrissae.
The expansion of the coronal gyrus in N. trinacriae testifies a specific adaptation to aquatic environments and to swimming, very close to the one of N. ichnusae Malatesta
Ricerche istologiche e considerazioni cliniche sopra un caso di anemia splenica
No full textPel Dott. Galletta Vincenzo. Atti della Reale Accademia Peloritana dei Pericolanti. Anno IX 1894-189
