Aim of this study was to monitor the solar ultraviolet-B intensity and to compare the phototoxic effect of different intensity of natural and artificial ultraviolet-B on human red blood cells in presence of compounds as riboflavin and chloroquine. Photohemolysis of erythrocytes was studied under natural solar radiation and artificial ultraviolet-B radiation of 312 nm. Monitoring of solar ultrav...

The redox and associated chemical behavior of 4aminopyrimidine (4AP) and its reduction products in buffered aqueous media have been examined by a variety of electrochemical techniques. In acidic medium (pH O-2), 4AP undergoes a two-step reduction: pH-dependent wave I corresponds to a threeelectron (3~) process; wave II, which corresponds to a le transfer, is accompanied by catalytic hydrogen di...

Human urine, blood serum, cerebrospinal fluid, and amniotic fluid have been analyzed by high-resolution chromatographic systems under development at the Oak Ridge National Laboratory. These systems, or analyzers, consist of heated, high-pressure anion.exchange columns for chromatographic separation of the constituents and continuous-flow ultraviolet spectrophotometry or phenol-sulfuric acid col...

We present phase-resolved infrared and optical spectrophotometry of the intermediate polar EXHya supplemented by archival ultraviolet data. The spin-modulated emission from the accretion funnel and the emission from the accretion disk or ring contain substantial optically thin components. The white dwarf dominates the unmodulated flux in the ultraviolet and is identified by numerous absorption ...

Caffeine, its physiological actions, and its metabolic fate have been of great interest to the medical profession for many years because of the therapeutic value of the drug as a respiratory and circulatory stimulant, and its wide-spread consumption in beverages. Despite this, a suitable method for the detection and quantitative determination of small amounts of caffeine in body fluids has not ...

An automated procedure is presented for the enzymatic determination of serum uric acid on both the AutoAnalyzer and the Robot Chemist. The procedure measures as the neocuproine complex, the difference in the amount of Cu+ formed by reaction of a Cu++ aIkanoIamine buffered solution with serum uric acid under precisely controlled conditions before and after uricase treatment of the serum. The dif...

PENTACHLOROPHEXOL (PCP) is used widely iii agriculture and industry because of its broad spectrum of toxicity for lower plants and animals. The solubility of PCI’ in organic solvents and the solubility of its salts in aqueous solutions accounts for its wide range of applications. PCP may enter the body by way of inhalation, ingestion, or absorption through the skin (1). Regardless of the route ...