The previous observation (BABIOR, B. M., J. Biol. Chem., 244, 449 (1969)) that the tritium isotope effect for the coenzyme B,,-dependent deamination of ethanolamine was smaller than the deuterium isotope effect prompted a reexamination of the various isotope effects observed in this reaction. Measurements of the rates of deamination of [l-D]and [l,l-Dn]ethanolamine showed that no secondary isot...

Isotope effects on heat conduction and convection have been known for decades. However, whether thermal radiation can be isotopically engineered remains an open question. Here, we predict over 3-orders-of-magnitude variation of radiative flow with varying isotopic compositions polar dielectrics at room temperature. We reveal this as isotope mass effect which induce phonon line shift broadening ...

The oxygen isotope fractionation factors between the hydration complex of the alkali ions in the gas phase and a free water molecule have been computed on the basis of the energy surfaces calculated by Kistenmacher, Popkie and Clementi for a water molecule in the field of an alkali ion. For comparison with recently measured oxygen isotope fractionation factors in aqueous alkali halide solutions...

The origin of substrate preference in promiscuous enzymes was investigated by enzyme isotope labelling of the alcohol dehydrogenase from Geobacillus stearothermophilus (BsADH). At physiological temperature, protein dynamic coupling to the reaction coordinate was insignificant. However, the extent of dynamic coupling was highly substrate-dependent at lower temperatures. For benzyl alcohol, an en...