Using diffusion-based models for concretion growth, we calculate growth times of hematitic concretions that have been found in the Burns formation at Meridiani Planum, Mars, by NASA's Opportunity Mars Exploration Rover. Growth times of ~350–1900 terrestrial years are obtained for the observed size range of the concretions over a range of parameters representing likely diagenetic conditions and ...

BACKGROUND Inhabitants of agrarian villages of rural Cambodia suffer from high prevalences of iron deficiency and anemia in the context of a monotonous diet. OBJECTIVE To compare the efficacy and safety of placebo Khmer fish sauce to that of 10 mL of fish sauce containing 10 mg of iron, added to daily school meals either as NaFe-EDTA or as FeSO4+ citrate. METHODS 140 students aged 6-21 year...

OBJECTIVE Combating iron deficiency in toddlers with iron-fortified food has proved difficult in countries with phytate-rich diets. For this purpose, a new haem iron preparation was developed. The study compared changes in iron status after administration of refried beans with beans fortified with a haem iron preparation or ferrous sulphate (FeSO4). DESIGN In a masked, stratified-randomised i...

Neovascularization and hemorrhage are common features of malignant tumors. We wondered whether hemoglobin derived from extravasated RBC deposits heme-derived iron into the tumor, which could modulate the sensitivity of cancer cells to oxidant-mediated injury. A brief exposure (1 h) of 51Cr-radiolabeled breast cancer cells (BT-20) but not colon cancer cells (Caco-2) to hemin (10 microM) or FeSO4...

Iron is a necessary mineral for plants' biological redox system and an important component of many enzymes. In the present study, effect of iron on morphological, biochemical, and physiological properties of soybeanwere investigated. The experiments were arranged in a completely randomized design with three replicates. Analysis of the data was carried out using SPSS with multiple range Duncan t...

Oxidative precipitation is a facile synthesis method to obtain ferromagnetic iron oxide nanoparticles from ferrous salts—with unexplored potential. The concentration of base and oxidant alone strongly affects the particle's structure thus their magnetic properties despite same material, magnetite (Fe3O4), obtained when precipitated with potassium hydroxide (KOH) sulfate (FeSO4) treated nitrate ...

Introduction: There is a growing interest in the study of sulfate minerals on the surface of Mars, supported by the discovery of jarosite at Meridiani Planum [1-3]. There is also the possibility of finding hydrous sulfate minerals in the permafrost, located at the polar regions. Sulfate minerals often precipitate in a variety of hydration states in the presence of liquid water. The spectra of s...

The flotation recovery of sphalerite depends on the inorganic reagents concentrations in liquid phase suspension and pH. This paper presents results studies interactions iron (II) containing ions with surface water solutions at different pH levels. thermodynamic electrochemical were carried out to analyze possible sulfate a environment relate them potassium butyl xanthate sodium dibutyl dithiop...

Abstract Sludge is one of the by-products wastewater treatment plants (WWTPs). To assist biological processes, part produced sludge returned to process and excess removed from plant whereby it undergoes thickening dewatering. Numerous studies have been conducted investigate effect different coagulants on dewatering sludge, but using divalent iron for this purpose has not investigated so far. In...

Anaerobic microbial reductive dechlorination of PCBs is important because it removes the chlorine substituents that block aerobic metabolism and it reduces PCB toxicity. Although this process occurs widely in nature, its extent is often limited to dechlorination of some of the chlorines in the meta positions of biphenyl. In this report we demonstrate the ability to achieve nearly complete meta ...