The adsorption of nitrous oxide N 2 O on the Pd(110) surface has been studied and characterized using densityfunctional theory. We found that N 2 O binds weakly to the surface in two alternative forms, either tilted with the terminal N atom attached to the surface or lying horizontally on the surface in the [001] direction. The adsorption on the on-top site is more stable than that on the bridge one. The horizontal form of N 2 O(a) is appropriate as the precursor of the inclined desorption of the product N 2 observed in the thermal decomposition of N 2 O(a).

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Abstract:This study aimed to provide a systematic overview of water sources in the Baikal region and Transbaikalia by the content of radon (Q) and establish regularities in variations of Q values in space and time.We collected and analyzed our evaluations of Q and the available published Q values for many dozens of water sources in the study area (Fig.

The effects of NaOH on the conformations, interactions, diffusion, and hydrolysis rates of hyaluronate (HA) were characterized in detail using static light scattering (i) in the traditional "batch" mode (for conformations and interactions), (ii) in a time-dependent, simultaneous multiangle mode (for the hydrolysis rates), and (iii) coupled to HPLC for preliminary characterization of distributions of hydrolysis fragments. Strikingly, the conformations, interactions, and hydrolysis rates all seem to be controlled by the titration of the HA hydroxyl groups by NaOH to yield -0", which (i) destroys single strand hydrogen bonds, leading to the very rapid destiffening and contraction of the HA coil and to a large decrease in intermolecular interactions, and (ii) leads to the slow intramolecular cleavage (hydrolysis) of glycosidic bonds. Remarkably, the root mean square radius of gyration Rg, the second virial coefficient A%, and hydrolysis rates all appear as mutually superposing titration curves which yield a pK of around 13. Interestingly, in contrast to classical "nondraining" coil molecules, the hydrodynamic radius of HA, as measured by dynamic light scattering, is independent of [NaOH] and the contraction of Rt.