the purpose of this study was to find a relatively inexpensive method for removal of arsenate and arsenite from drinking water. the capability of iranian natural clinoptilolites, relevant synthetic zeolites a and p and iron(п) modified of them was investigated for the uptake of arsenic anions from drinking water. data obtained from ion-exchange using batch (static) technique showed that among t...

The benzophenone radical anion 2 was generated by reaction of electrons with 1 in argon and water matrices at cryogenic temperatures. Sodium as source the co-deposited or low-density amorphous (LDA) ice matrices. In solid argon, sodium atoms, 1, small quantities were observed after deposition. Visible light irradiation these resulted an electron transfer from to under formation 2. If LDA used m...

polyphenol oxidase (ec. 1.10.3.1 ppo), an ionically unbound and thermostable enzyme, was extracted from the leaves of cinnamomum tamala having aroma flavor used to add in indian food and vegetables as a part of spices to enhance the taste of recipes. the enzyme was purified 2.63-fold with a total yield of 9.5% by ammonium sulfate precipitation followed by sephadex g-100 gel filtration chromatog...

In many parts of the world, groundwater contains so much arsenic that it builds up in irrigated crops. Linked to cancer and heart disease, this toxic element is particularly worrisome in rice, which absorbs arsenic more readily than other grains and is a staple for billions of people. Countries with the double whammy of arsenic-laced groundwater and heavy rice consumption include Bangladesh, In...

Sagers, Richard D. (Brigham Young University, Provo, Utah), Moshe Benziman, and Sigrid M. Klein. Failure of arsenate to uncouple the phosphotransacetylase system in Clostridium acidiurici. J. Bacteriol. 86:978-984. 1963.-The conversion of pyruvate to acetyl phosphate by extracts of Clostridium acidiurici required coenzyme A (CoA), an electron-carrier system (ferredoxin and nicotinamide adenine ...

introduction: arsenic is a highly toxic metalloid in group 15 of periodic table. the information on environmental behaviour of arsenic, however, is still scarce. contamination of soils and water with arsenic and antimony due to their widespread industrial application and mining activities has raised serious environmental concerns. nearly all arsenic-contaminated soils results from human activit...

The kinetics of sodium-stimulated phosphate flux and phosphate-stimulated sodium flux in human red cells have been previously described (Shoemaker, D.G., C.A. Bender, and R.B. Gunn. 1988. J. Gen. Physiol. 92:449-474). However, despite the identification of multiple isoforms in three gene families (Timmer, R.T., and R.B. Gunn. 1998. Am. J. Physiol. Cell Physiol. 274:C757-C769), the molecular bas...

Results are presented from X-ray absorption spectroscopy based analysis of As, Cr, and V speciation within samples of bauxite ore processing residue (red mud) collected from the spill site at Ajka, Western Hungary. Cr K-edge XANES analysis found that Cr is present as Cr(3+) substituted into hematite, consistent with TEM analysis. V K-edge XANES spectra have E(1/2) position and pre-edge features...