The alkali preparation of the root and fresh leaf juice of Moringa oleifera possessed significant dose -depen-dent anti-ulcer activity in experimentally induced acute gastric ulcers with aspirin, the anti-ulcer effect of the alkali preparation of the root seems to be more pronounced than that of the fresh leaf juice. Te anti-ulcer activity of the alkali preparation of the root could be due to i...

Collective surface excitations in alkali-metal overlayers are observed using photoyield spectroscopy. Spectra for Na and K on Al~111! reveal a multipole surface plasmon and bulklike overlayer plasmon. In contrast, Li on Al exhibits only the multipole mode. In the submonolayer regime, all three alkali metals provide evidence for the threshold excitation. Time-dependent density-functional calcula...

We investigate the measurement of alkali number densities using the Faraday rotation of linearly polarized light. We "nd that the alkali number density may be reliably extracted even in regimes of very high bu!er gas pressure, and very high alkali number density. We have directly veri"ed our results in potassium using absorption spectroscopy on the second resonance (4 SP5 P). 2001 Published by ...

A stability analysis of metal nanowires shows that a Jahn-Teller deformation breaking cylindrical symmetry can be energetically favorable, leading to stable nanowires with elliptic cross sections. The sequence of stable cylindrical and elliptical nanowires allows for a consistent interpretation of experimental conductance histograms for alkali metals, including both the electronic shell and sup...

Long-range electrostatic and van der Waals coefficients up to terms of order R(-8) have been evaluated by the sum over states method using ab initio and time-dependent density functional theory. We employ several widely used density functionals and systematically investigate the convergence of the calculated results with basis set size. Static electric moments and polarizabilities up to octopol...

Alkali metal salts of thiocarboxylic acid, especially anhydrous salts, are of the most important starting materials. However, only a limited amount of information on their preparation and spectral data has been available because of their strong hygroscopicity [1]. Recently, the convenient preparation methods of a series of anhydrous alkali metal dithiocarboxylates were developed [2]. This resul...

The aim of the present study was to investigate the inhibitory effects of 90Sr-90Y β-irradiation in a rat model of alkali burn-induced corneal neovascularization (CNV). Alkali burn-induced CNV was induced in the right eyes of 30 female Wistar rats, which were randomly divided into the following three groups (n=10/group): i) The alkali burn control group, which received a balanced salt solution ...

The validity of the reducing end group (copper reduction) method for determination of chain weight of chondroitin sulfate is shown by comparison with chain weight determination from linkage region components, xylose and galactose. It is established that chains of both chondroitin sulfate and keratan sulfate are stable to alkali as strong as 2.0 N NaOH at room temperature for at least 120 hours....

We present a comprehensive theory of nuclear spin polarization of He and Xe gases by spin-exchange collisions with optically pumped alkali-metal vapors. The most important physical processes considered are ~1! spin-conserving spin-exchange collisions between like or unlike alkali-metal atoms; ~2! spin-destroying collisions of the alkali-metal atoms with each other and with buffer-gas atoms; ~3!...