Samples of dark to black fayalite from ten localities around the world were examined by 57Fe Mossbauer spectroscopy to see if any contained significant proportions of ferric iron. Of these ten samples, four, including a sample of ferrifayalite from Qianan County, China, previously known to contain ferric iron, were found to contain large amounts of this cation. Ferric/ferrous ratios of these sa...

background: one of the major sources of drinking water contamination is nitrate. nitrate concentrations of more than the standard levels (45mgl -1 based on nitrate) could cause methemoglobinemia in children. the aim of this study is to investigate the nitrate adsorption on granular ferric hydroxide (gfh). also in this study, the effect of factors such as initial concentration of nitrate, contac...

results in all the groups, complete hemostasis occurred. hemostasis times of different concentrations of ferric sulfate were significantly less than those of the control group (p < 0.001). objectives this study attempted to determine the haemostatic effect of ferric sulfate and compare it with the standard method (suturing technique). materials and methods in this animal model study, 60 male wi...

Abstract Torrential rainfall regimes, among others, are the origin of accelerated soil erosion. The Spanish southeastern Mediterranean region is characterised by an arid climate regime affected extreme erosion episodes with important loss sediments. Soil effects even more noticeable in areas where has been anthropically degraded, as mining district Sierra Minera de Cartagena . present research ...

The periplasmic protein FepB of Escherichia coli is a component of the ferric enterobactin transport system. We overexpressed and purified the binding protein 23-fold from periplasmic extracts by ammonium sulfate precipitation and chromatographic methods, with a yield of 20%, to a final specific activity of 15,500 pmol of ferric enterobactin bound/mg. Periplasmic fluid from cells overexpressing...

IN certain experiments on iron metabolism, involving the iron-containing protein of egg-yolk, lecitho-vitellin, we planned to make a large number of iron estimations. To conserve our small supply of protein, the preparation of which had involved considerable time and labour, we desired to cut down the size of the sample analysed to the smallest amount on which an accurate iron determination cou...