A series of models for the active site (H-cluster) of the iron-only hydrogenase enzymes (Fe-only H2-ases) were prepared. Treatment of MeCN solutions of Fe2(SR)2(CO)6 with 2 equiv of Et4NCN gave [Fe2(SR)2(CN)2(CO)4](2-) compounds. IR spectra of the dicyanides feature four nu(CO) bands between 1965 and 1870 cm(-1) and two nu(CN) bands at 2077 and 2033 cm(-1). For alkyl derivatives, both diequator...

The behavior of arsenic (As) in paddy soil is great interest because rice an efficient As accumulator, which can result potential health risks to humans. In this study, we investigated the distribution and translocation speciation within soil-rice system presence Fenton solution (100 ?M H2O2 100 Fe2+). results showed that iron plaque concentrations were enhanced either by addition or under floo...

BackgroundCopper (Cu) and iron (Fe) are essential trace elements that when in excess capable of causing cytotoxic effects leading to lipid peroxidation promoting oxidative stress. Resveratrol (RES) is a natural polyphenol with antioxidant anti-inflammatory properties. This study was carried out evaluate the protective role RES Fe Cu sulphate-induced stress Drosophila melanogaster. MethodsAdult ...

A new method for the non-specific determination of iron-porphyrin-like complexes in natural waters has been developed. It is based on the chemiluminescent oxidation of the luminol in the presence of dioxygen (O2) at pH 13. The method has been implemented in a FIA manifold that allowed the direct injection of seawater. The limit of detection is 0.11 nM of equivalent hemin (Fe-protoporphyrin IX)....

Hemoglobins are a group of respiratory proteins principally functioning in transport of oxygen and carbon dioxide in red blood cells of all vertebrates and some invertebrates. The blood clam T. granosa is one of the few invertebrates that have hemoglobin-containing red hemocytes. In the present research, the peroxidase activity of T. granosa hemoglobins (Tg-Hbs) was characterized and the associ...

Experiments were performed in parallel using six identical UASB (upflow anaerobic sludge blanket) reactors to examine the effects of iron (Fe2+) on sludge granulation during start-up. Introduction of Fe2+ at concentrations of 300 and 450 mg/L enhanced the granulation process in UASB reactors, while dosage of Fe2+ (150 mg/L) had little effect on the sludge granulation. The Fe2+concentration in g...