the regioselective ring opening of styrene oxide using elemental iodine and bromine in the presence of disulfides as new catalysts was studied. the conductivity titration and uv spectroscopy were used to study the interaction of iodine with these catalysts. the results indicate that disulfide 11 is efficient in polyiodide formation, and can catalyze this reaction in excellent yield and high reg...

1. Titration of haem with pyridine in alkaline media of low ionic strength yields a true pyridine haemochromogen, compound III, at very low concentrations of pyridine. 2. Graphical analysis of this titration gives the first spectrophotometric evidence for a dimeric haem. 3. Compound III is unstable and tends to aggregate to a second compound, compound II, whose formation is enhanced under those...

The regioselective ring opening of styrene oxide using elemental iodine and bromine in the presence of disulfides as new catalysts was studied. The conductivity titration and UV spectroscopy were used to study the interaction of iodine with these catalysts. The results indicate that disulfide 11 is efficient in polyiodide formation, and can catalyze this reaction in excellent yield and high reg...

It has been shown by Troll et al. (1) that plasmin (present in the blood in an inactive form) can hydrolyze esters of arginine and lysine. These authors used a form01 titration method to follow the action of plasmin on TAME (p-toluenesulfonyl-L-arginine methyl ester) and several precipitation and titration methods (2) to follow the action of the enzyme on LME (L-lysine methyl ester). They also ...

This paper describes a novel, simple and sensitive method for the determination of glyphosate in water samples by alternating-current oscillopolarographic titration. Under an acidic condition, glyphosate can be transferred into a nitrosocompound by reacting with NaNO2. The titration end-point was obtained by the formation of a sharp cut in the oscillopolarographic with infinitesimal NaNO2 on do...

Uridine-5'-diphospho-N-acetylgalactosamine (UDP-GalNAc) is required in the formation of the outer filamentous wall of Giardia and is synthesized by inducible enzymes in the cytosol of encysting trophozoites. In this study, an inducible enzyme activity that is associated with a particle population isolated from encysting Giardia is reported, and this activity exclusively incorporates [1-(14)C]Ga...