Analysis of the temperature dependence of the structural relaxation time τ(α)(T) in supercooled liquids revealed a qualitatively distinct feature-a sharp, cusplike maximum in the second derivative of logτ(α)(T)at some T(max). It suggests that the super-Arrhenius temperature dependence of τ(α)(T) in glass-forming liquids eventually crosses over to an Arrhenius behavior at T<T(max), and there is ...

Whereas biosensors have been usually proposed as analytical tools, used to investigate the surrounding media pursuing an analytical answer, we have used a biosensor-like device to characterize the microbial cells immobilized on it. We have studied the kinetics of transport and degradation of glucose at different concentrations and temperatures. When glucose concentrations of 15 and 1.5 mM were ...

Using molecular-dynamics simulation, we calculate the distribution of atomic jumps in Cu33Zr67 in the liquid and glassy states. In both states the distribution of jump lengths can be described by a temperatureindependent exponential of the length and an effective activation energy plus a contribution of elastic displacements at short distances. Upon cooling the contribution of shorter jumps dom...

In an isometric tetanus in frog's sartorius muscle tension approaches the plateau exponentially with rate constant alpha. alpha a depends on sarcomere length, s, and temperature, T, according to the Arrhenius equation See PDF for Equation for temperatures between 1 and 20 degrees C and for sarcomere lengths 2.0-2.8 microm. The energy of activation, E, does not vary significantly with s; E = 13....

Diffusion measurements have been made for 114In in Ga between 20° and 455 °C, and for 72Ga in In between the m.p. and 380 °C. Linear plots of D vs T describe the results about equally well as Arrhenius representations. The Arrhenius parameters are D0 = 2.1 • 104 cm2/s, @ = 1.64 kcal/mol for In in Ga, D0 = 2.4 • 10~ 4 cm2/'s, Q = 1.93 kcal/mol for Ga in In. Ga diffuses faster than In in both mat...

00 succinate oxidase activity of liver mitochondria from homeotherms and poikilotherms. For the poikilotherms, Arrhenius-type plots were linear over the temperature range 4°to 30°C. In contrast, for the homeotherms, the plots were biphasic with a ‘break” or “discontinuity” at about 23°Cand an increase in Arrhenius activation energy in the temperature range beiow the “break.” The results suggest...

The concept of 'fragility' constitutes a central point of the glass transition science serving as the 'universal' metric linking previtreous dynamics of qualitatively distinct systems. Finding the fundamental meaning of fragility is the 'condicio sine qua' for reaching the long expected conceptual breakthrough in this domain. This report shows that fragility is determined by the ratio between t...

When a strong, though non-Arrhenius temperature dependence of electrical resistivity is observed, one usually concludes that the underlying mechanism is variable-range hopping. Unexpectedly, such observations are also made for many semiconductor systems at elevated temperatures, where a variable-range hopping mechanism seems unlikely. A satisfactory explanation for this observation is still lac...

Arrhenius plots of 5'-nucleotidase activity in microsomes or plasma membranes from rat liver exhibited transitions at approximately 35 degrees C. The enzyme was purified from homogenates after solubilization in 2% Triton X-100 and 1% sodium deoxycholate. After the initial steps of the purification, the enzyme was recovered in membranes, as judged by both thin section and freeze-fracture electro...

In this study chick pea β-galactosidase was first time purified and recovered in single step by three phase partitioning (TPP). Optimal purification parameters for TPP were 60% ammonium sulfate saturation (w/v) with 1:0.5 (v/v) ratio of crude extract:t-butanol at pH 6.8, which gave 10.1 purification fold with 133% recovery of β-galactosidase. SDS-PAGE analysis showed that protein has two subuni...