To contribute to the development of a reference reagent for monitoring heparin therapy, a lyophilized partial thromboplastin time (PTT) reagent was prepared from synthetic dioleoylphosphatidylcholine, dioleoylphosphatidylserine, and dioleoylphosphatidylethanolamine, with colloidal silica as activator. The reagent, coded 91/558, was contained in sealed glass ampoules; it deteriorated in a heat d...

Rubinstein J (1995) Cohtmn Flotation: Processes, Designs and Practices. New York: Gordon and Breach. Schubert Hand Bischofberger C (1979) On the optimization of hydrodynamics in flotation processes. In: Laskowski J (ed.) Proceedings of the 13th International Mineral Process Congress, pp. 1261-1287. Warsaw: Elsevier. Wills BA (1992) Introduction to Mineral Processing Technology, 5th edn, pp. 558...

Reviewing the reaction of potassium cyanate, an antisickling agent, with alpha-amino groups of hemoglobin, it was found that the reaction was a slow process and requires a large excess of the reagent. The reason for the slow reaction rate of carbamylation of hemoglobin by cyanate is that cyanate itself does not react with hemoglobin. It is rather isocyanic acid, the reactive species, that react...

2,4,6-Tripyridyl-s-triazine (TPTZ) is a color reagent for ferrous ion in the pH range 2 to 10,when ascorbic acid is used as the reducing agent. In this range TPTZ and ferrous ion combine in the ratio of two to one. Tris buffer is commonly used to maintain an alkaline pH, but it reacts with other reducing agents, rendering them ineffective. These observations suggested a method for the joint det...

Due to its action on angiotensin I and bradykinin, angiotensin converting enzyme (ACE, dipeptidyl carboxypeptidase, EC 3.4.15.1) plays a crucial role in blood pressure regulation [l]. Attention was focused on this enzyme when Lieberman observed elevated serum ACE levels in active sarcoidosis [2]. Because ACE is a sensitive index both in assessing the clinical status of this disease and in monit...

In this study, a novel organic depressant maleyl 5-amino-1,3,4-thiadiazole-2-thiol (MATT) was synthesized and utilized as galena in the flotation separation of molybdenite galena. The results test indicated that MATT exhibited an excellent depression ability on but barely influenced pH range 6.0–11.0. Zeta potential suggested preferentially adsorbed surface. UV-visible spectroscopy analysis sto...

R ECENTLY a new reagent was proposed for the determination of cholesterol (1, 2). This reagent was purported to be saturated ferrous sulfate in glacial acetic acid. Since it has been reported that ferrous sulfate is qualitatively insoluble in anhydrous acetic acid (3, 4) and that ferrous iron is “subject to pronounced air oxidation in glacial acetic acid” (5), it was felt that several factors s...

The compound (C5H5)2TiS5 has allowed the rational syntheses of many sulfur homoand heterocycles.' This reagent serves as a reliable source of the S52unit, thereby defining a route to cyclic compounds of the type cyclo-S5+, and related Se-S rings.2 The coproducts and starting reagents are fairly chemically inert thus minimizing nucleophile-induced rearrangements of unstable cyclic polysulfanes. ...

We evaluated the cell wall binding (CWB) domain of Staphylococcus aureus autolysin as an affinity reagent for bacteria. A fusion of CWB domain and green fluorescent protein (CWB-GFP) bound to S. aureus with a dissociation constant of 15 nM. CWB-GFP bound to a wide range of gram-positive bacteria, but not to most gram-negative bacteria. We suspected that the outer membrane of gram-negative bacte...

Since the discovery by Yagupolskii and co-workers that S-trifluoromethyl diarylsulfonium salts are effective for the trifluoromethylation of thiophenolates, the design and synthesis of electrophilic trifluoromethylating reagents have been extensively researched in both academia and industry, due to the significant unique features that trifluoromethylated compounds have in pharmaceuticals, agric...