Epidemiological studies continue to identify an association of dietary antioxidant micronutrients in cancer prevention. A number of case-control and cohort studies have demonstrated a relationship between high intake of foods rich in carotenoids, tocopherols, and vitamin C with a reduced risk of certain human malignancies. The purpose of this study was to investigate the comparative plasma leve...

Of 100 workers exposed to lead in varying degrees, 34 had a urinary delta amino-laevulinic acid (ALA) concentration of above 0-6 mg./100 ml. and a further 35 had an ALA concentration of between 0 3 mg. and 0-6 mg./100 ml. In only 20 of the workers was the urinary porphobilinogen concentration above 0-1 mg./100 ml., two of these being above 0-2 mg./100 ml. No significant correlation was found be...

To maintain local pH levels near the electrode during electrochemical reactions, the use of buffer solutions is effective. Nevertheless, the critical effects of the buffer concentration on electrocatalytic performances have not been discussed in detail. In this study, two fundamental electrochemical reactions, oxygen reduction reaction (ORR) and hydrogen oxidation reaction (HOR), on a platinum ...

We demonstrate the fabrication by anodization of niobium oxide microcones, several microns long, from aqueous solutions of 1 wt% hydrogen fluoride (HF) with varied sodium fluoride (NaF) concentration (0–1 M). Raman spectroscopy and x-ray diffractometer analysis revealed the as-grown microcones to be crystalline Nb2O5−x with preferred (1 0 0) and (0 1 0) orientations. The overall Nb2O5−x formati...

This paper analyzes the equilibria involved in the dimerization of monomeric receptors with homo-bifunctional ligands. We provide analytical expressions that can be used to estimate the concentration of each species present in a mixture of homo-bifunctional ligand and monomeric proteins, given initial conditions defining the total concentration of bivalent ligand [L2]0, the total concentration ...

potassium concentrations by flame photometry (within batch SD=0 03 mmol/l). The Mann-Whitney U test and Spearman's rank correlation coefficient were used in statistical analysis. The median (range) difference in potassium concentration between serum and plasma in the 43 patients with rheumatoid arthritis was 0 3 (0 1-1 3) mmol/l, which was significantly greater (p<0 001) than that in the 21 con...

A three-part strategy has been developed to study molecular interactions in biological systems at the atomic level. First, isotopically labeled carotenoids and retinoids are prepared by organic total synthetic schemes with labels at predetermined atomic positions and combinations of positions. Subsequently, the labeled compounds are incorporated in the biological system. Finally, the system is ...