Recent studies have established the importance of zinc as a biological constituent in human blood. Normal zinc levels for human whole blood, plasma, erythrocytes, and leucocytes have been established (1) ; significant deviations from the norm occur in leucemia and pernicious anemia, and, possibly, in sickle-cell anemia (24). Zinc concentration is considered an expression of the carbonic anhydra...

Selective membranes containing a few micrograms of various complexing reagents in a polyvinyl chloride (PVC) matrix were produced in order to determine low uranium concentrations in water. The membranes were produced on the surfaces of quartz glasses, and immersed in water solutions containing uranium salts (5 - 50 ng/mL). By the end of the equilibration time, the membranes were left to dry and...

diazotization of 3-amino-2-cmoro pyridine (3) in the presence of dithizone (5) gave dphenyl-2-phenylazo-4h-pyrid[o3 ,2-e] [1,3,4] thiadiazine (6). reaction of 2- chloro-3-nitropyridine (2, g=h) with (5) dfordd 4-phenyl -2-phenylazo -4hpyrido [2,3-el [1,3,4] thiadiazine (7). reduction of the latter with h gas in the presence of raney nickel gave the corresponding amino derivative (12). one pot c...

Biosorption is the ability of biological materials to accumulate heavy metals from wastewater through metabolically mediated or physico-chemical pathways. Here, Heavy metals are considered to be the common contaminant of ecosystem due to their toxicity and it is necessary to remove those metals from environment. Among various metals, lead was considered to be common contaminant which causes sev...