Consideration of needs for public health interventions and new research requires comparative assessments of the health benefits that are likely to result from alternative uses of limited regulatory and technical resources. This paper briefly examines regulatory and research priorities in the light of recent information on the carcinogenic hazards of vinyl chloride and alkyl and vinyl halides re...

Dodecabenzylbambus[6]uril (Bn12BU[6]) is an anion receptor that binds the perchlorate ion most tightly (stability constant ~1010 M?1) of all anions due to excellent match between size in relation cavity. This new bambusuril compound was used as ionophore ion-selective membrane (ISM) develop selective electrodes (ISEs) for determination concentration utilizing poly(3,4-ethylenedioxythiophene) (P...

OBJECTIVE To study the mechanism by which poly-L-arginine mediates endothelium-dependent relaxation. METHODS Vascular segments with and without endothelium were suspended in organ chambers filled with control solution maintained at 37 C and bubbled with 95% O2 / 5% CO2. Used drugs: indomethacin, acetycholine, EGTA, glybenclamide, ouabain, poly-L-arginine, methylene blue, N G-nitro-L-arginine,...

Poly(vinyl chloride) resins are produced by four basic processes: suspension, emulsion, bulk and solution polymerization. PVC suspensions resins are usually relatively dust-free and granular with varying degrees of particle porosity. PVC emulsion resins are small particle powders containing very little free monomer. Bulk PVC resins are similar to suspension PVC resins, though the particles tend...

The use of liquid-liquid extraction for the separation of zirconium from hafnium was demonstrated. Hafnium spectrographically free of zirconium was prepared in quantity on a continuous basis. High purity fractions of zirconium were also prepared.