-The crystal chemistry of Fe-Si scales deposited from geothermal brines at Salton Sea, California, was studied by powder X-ray diffraction and spectroscopic techniques including infrared, 5VFe M6ssbauer, 27A1 and 29Si nuclear magnetic resonance (NMR), and Fe and Si K-edge extended X-ray absorption fine structure (EXAFS). Scales precipitated at near 250~ from dissolved ferrous iron and silicic a...

Thiobacillus ferrooxidans is found in many Alaskan and Canadian drainages contaminated by metals dissolved from placer and lode gold mines. We have examined the iron-limited growth and iron oxidation kinetics of a T. ferrooxidans isolate, AK1, by using batch and continuous cultures. Strain AK1 is an arsenic-tolerant isolate obtained from placer gold mine drainage containing large amounts of dis...

Lysosomal degradation of the carbohydrate portion of glycoproteins and glycosaminoglycans produces monosaccharides and sulphate, which must efflux from the lysosomes before re-entering biosynthetic pathways. We examined the degradation of glycoproteins and glycosaminoglycans by lysosomes isolated from cultured human diploid fibroblasts. Cells were grown for 24 h in medium containing [3H]glucosa...

Heterogeneous catalysts of ruthenium were prepared by impregnation on activated carbon and ZSM-5 and were used to degrade phenol in the presence of peroxymonosulphate (PMS). The ruthenium based catalysts were characterised by several techniques such as XRD, SEM, and N2 adsorption. It was found that Ru-AC is highly effective in heterogeneous activation of peroxymonosulphate to produce sulphate r...

Background: The high prevalence of anaemia in pregnancy has serious adverse consequences both mother and baby. Management should be given great importance obstetric practice.The study was undertaken to compare the efficacy oral iron (ferrous sulphate) intravenous sucrose complex management moderate pregnancy. Method: A randomized comparative hospital–based longitudinal analysis conducted Depart...

Human cytochrome P450 (P450) 2A6 catalyzes 7-hydroxylation of coumarin, and the reaction rate is enhanced by cytochrome b5 (b5). 7-Alkoxycoumarins were O-dealkylated and also hydroxylated at the 3-position. Binding of coumarin and 7-hydroxycoumarin to ferric and ferrous P450 2A6 are fast reactions (k(on) approximately 10(6) m(-1) s(-1)), and the k(off) rates range from 5.7 to 36 s(-1) (at 23 de...

Human cytochrome P450 (P450) 2A6 catalyzes 7-hydroxylation of coumarin, and the reaction rate is enhanced by cytochrome b5 (b5). 7-Alkoxycoumarins were O-dealkylated and also hydroxylated at the 3-position. Binding of coumarin and 7-hydroxycoumarin to ferric and ferrous P450 2A6 are fast reactions (kon 10 6 M 1 s ), and the koff rates range from 5.7 to 36 s 1 (at 23 °C). Reduction of ferric P45...

Oxidation of ferrous iron was studied with the anaerobic phototrophic bacterial strain BS-1. Based on morphology, substrate utilization patterns, arrangement of intracytoplasmic membranes and the in vivo absorption spectrum, this strain was assigned to the known species Rhodomicrobium vannielii. Also, the type strain of this species oxidized ferrous iron in the light. Phototrophic growth of str...

The tetraheme cytochrome c(554) (cyt c(554)) from Nitrosomonas europaea is believed to function as an electron-transfer protein from hydroxylamine oxidoreductase (HAO). We show here that cyt c(554) also has significant NO reductase activity. The protein contains one high-spin and three low-spin c-type hemes. HAO catalyzed reduction of the cyt c(554), ligand binding, intermolecular electron tran...

It has been reported in literature that Z. mobilis has two types of alcohol dehydrogenase gene (ADH), one is Zinc inducible, and another is Iron (Ferrous) inducible. Therefore, it was attempted to increase the alcohol production by inducing the alcohol dehydrogenase activity by addition of Zinc ions. It was standardized that 10 mM Zinc sulphate addition to alcohol producing broth resulted in ma...