Unpoisoned sartorius muscles of Rana temporaria were stimulated tetanically in isometric contractions lasting up to 20 s at 0 degrees C. The observed enthalpy (heat + work) production and the chemical changes in these contractions were measured, and a comparison was made between the observed enthalpy and the enthalpy that could be explained by the chemical changes. Like earlier workers, we foun...

Recent work has sought to extract the asymmetry energy at very low density from observables in heavyion collisions. The logic employed starts from the assumption that the fragment yields are determined by a minimization of the Helmholtz free energy. As volume is in reality unconstrained, nor can a single freeze-out volume be expected, the physical relevance of the Helmholtz free energy must be ...

abstract the aim of this research was to investigate the enthalpy variations of iranian flat breads during storage in room temperature and determining relationship between enthalpy and amount of staling development. for this purpose, the major iranian breads including barbari, taftoon, lavash and sangak beside baguette, were prepared using standard ingredients, specific recipe, and under contro...

13 The sublimation enthalpy of cubane, a key reference material for force field and quantum mechanical computations, was measured by combining the vaporization enthalpy at T = 298.15 K to the sum of the fusion enthalpy measured at T = 405 K and a solid–solid phase transition that occurs at T = 394 K. The fusion and solid–solid phase transitions were measured previously. A sublimation enthalpy v...

Many important industrial separation processes based on adsorption operate close to saturation. In this regime, the underlying adsorption processes are mostly driven by entropic forces. At equilibrium, the entropy of adsorption is closely related to the enthalpy of adsorption. Thus, studying the behavior of the enthalpy of adsorption as a function of loading is fundamental to understanding sepa...

The enthalpy changes for phosphorylating and nonphosphorylating mitochondrial oxidation of succinate by ferricyanide were studied by heatburst microcalorimetry. The enthalpy change observed with a nonphosphorylating system involving sonically disrupted mitochondria agreed with the calculated enthalpy change. The enthalpy changes for phosphorylating and uncoupled systems involving intact mitocho...

BACKGROUND Heat stress evaluation and timely notification, especially using meteorological data is an important issue attracted attention in recent years. Therefore, this study aimed at answering the following research questions: 1) can enthalpy as a common environmental parameter reported by meteorological agencies be applied accurately for evaluation of thermal condition of outdoor settings, ...

Abs t rac t -The persistence of many seemingly metastable mineral assemblages in sediments and soils is commonly attributed to their sluggish transformation to the stable-phase assemblage. Although undoubtedly kinetics plays a major role, this study shows that thermodynamic factors, particularly surface energy, significantly influence the free energy. Enthalpies of formation of boehmite samples...