in this research, the interaction of hexadecyl trimahyl ammonium bromide (htab) with enzyme ureasehas been investigated comprehensively at different experimental conditions such as ionic strength, proteinconcentration using ion selective membrane electrode of surfactants. the obtained binding isotherms frompotentiometnc studies have been analyzed by different theories such as wyman binding pote...

objective: evidence shows that the powder/liquid mixing ratio recommended by the manufacturers is often not respected when mixing the glass ionomer (gi) powder and liquid, yielding a gi cement with disproportionate powder/liquid ratio. considering the confirmed effect of powder/liquid ratio on the gi properties, and more importantly, its fluoride release potential, this study aimed to assess th...

metal ions <A13+, Ca2+, Cd2+, Co2+, Cr3+, Cu2+, Fe2+, Fe3+, K+, Mg2+, Mn2+, Na+, alld Zn2+) on antioxidatiye activities of (-)-epigallocatechin gallate (EGCG) were studied by an oxygen electrode method. The antioxidatiye activities of catechins were high and censtant at pH 6-12, but decreased in acidic and strollg alkaline solutions. Copper(II) ion the most strongly increased the antioxidative ...

Z. Naturforsch. 2011, 66b, 894 – 898; received June 19, 2011 Assembly reaction of copper(I) chloride, 2,2′-bipyridine-3,3′-dicarboxylic acid (H2L) and 2,2′-bipyridine results in the formation of a new complex [Cu2(C12H6O4N2)2(2,2′-bipy)2] ·CH3OH (1). In 1, two L2− ligands link two Cu(II) ions to form a dinuclear structure. The electrochemical and magnetic properties of 1 were investigated. The ...