XXIII.—On some compounds of calcium sulphate

detection of volatile compounds of medicinal plants with some nano-sorbents using modified or new methodologies and investigation of antioxidant activity of their methanolic extracts

in this work, a novel and fast method for direct analysis of volatile compounds (davc) of medicinal plants has been developed by holding a filament from different parts of a plant in the gc injection port. the extraction and analysis of volatile components of a small amount of plant were carried out in one-step without any sample preparation. after optimization of temperature, extraction time a...

Some characteristics of sulphate uptake into synaptosomes.

Incorporation of Na235SO4 by ovine brain Ficoll-prepared synaptosomes were studied as a function of time, temperature and substrate concentration. The rate of uptake obeyed Michaelis-Menten kinetics and apparent Km value of 4.4 mM Na2SO4 was determined. In the presence of p-hydroxymercuribenzoate a reduction in sulphate uptake was noted which suggests that thiol groups may possibly be implicate...

Antibacterial Activity of Some New Azole Compounds

Modelling of calcium sulphate solubility in concentrated multi-component sulphate solutions

The chemistry of several calcium sulphate systems was successfully modelled in multi-component acid-containing sulphate solutions using he mixed solvent electrolyte (MSE) model for calculating the mean activity coefficients of the electrolyte species. The modelling involved the tting of binary mean activity, heat capacity and solubility data, as well as ternary solubility data. The developed mo...

comparison of catalytic activity of heteropoly compounds in the synthesis of bis(indolyl)alkanes.

heteropoly acids (hpa) and their salts have advantages as catalysts which make them both economically and environmentally attractive, strong br?nsted acidity, exhibiting fast reversible multi-electron redox transformations under rather mild conditions, very high solubility in polar solvents, fairly high thermal stability in the solid states, and efficient oxidizing ability, so that they are imp...