Information derived from a study of 'isolated' CH stretching frequencies, measured in partially deuterated organic and organemetallic compounds, is reviewed. This includes CH bond lengths . and dissociation energies, and HCH angles in methyl groups, Excellent agreement is found between CH bond length differences predicted from VCH's values and those calculated by ab initio methods. V'sCH data a...

A simple effective atom-atom intermolecular potential for halogene solids (F2, Cl-, Br2 and 12) is proposed. The centers of inter action of the effective potential (6-exp type) are shifted from' the atomic sites in order to reduce anisotropy of the intermolecular distances. The calculated results of the static properties for fluorine and chlorine are in good agreement with the experimental resu...

The retention time of 23 barbituric acid derivatives was determined on an narrow-bore porous graphitized carbon (PGC) column employing water-dioxane mixtures as mobile phases. The retention factor (k), theoretical plate number (N), and asymmetry factor (AF) were computed for each analyte in each mobile phase. Quantitative structure-retention relationship (QSRR) calculations using stepwise regre...

Adsorption effects in square-wave and d. c. polarography of berberine are investigated in the supporting electrolytes of various pH. Tensametric a. c. and SW polarographic measurements show that both berberine and canadine are strongly adsorbed in the potential range between -0.3 V and --'1.7 V vs. SCE. The reduction of berberine proceeds from the adsorbed state and requires four electrons. The...

Following entry into the host cytosol, the bacterial pathogen Listeria monocytogenes dramatically increases the expression of several key virulence factors. The expression of actA, whose protein product is required for L. monocytogenes actin-based intracellular motility, is increased by more than 200-fold in cytosolic bacteria in comparison to broth-grown cultures. Two distinct promoter element...