The 57Fe M ößbauer spectra of mixed ligand com plexes o f the type frfl«5-Fe(CO)3L'L: (L 1 = triphenylphosphine or triphenylphosphite and L2 = phosphine or phosphite) show a quadrupolesplitting doublet typical of the disubstituted iron carbonyls in trigonal bipyramidal symmetry. The inverse linear dependence of the isomer shifts on the CO stretching frequencies is interpreted on the basis of th...

We present an efficient way to calculate the phase diagram of the quaternary Li-Fe-P-O2 system using ab initio methods. The ground-state energies of all known compounds in the Li-Fe-P-O2 system were calculated using the generalized gradient approximation (GGA) approximation to density functional theory (DFT) and the DFT+U extension to it. Considering only the entropy of gaseous phases, the phas...

Soil phosphorus (P) release capability could be assessed through the degree of P saturation (DPS). Our main objective was to determine DPS and, hence, P threshold DPS values of an Ultisol treated with triple superphosphate (TSP), Gafsa phosphate rocks (GPR), or Christmas Island phosphate rocks (CIPR), plus or minus manure. P release was determined by the iron oxide-impregnated paper strip (stri...

This experiment was designed to determine whether dietary hemoglobin (Hgb) iron (Fe) could 0271-5317/$ – see fro doi:10.1016/j.nutres.2 4 Corresponding a E-mail address: p sustain normal Fe status in growing rats adequate or deficient in copper (Cu). Forty-eight weanling rats were divided into 3 groups, each consisting of 16 animals. One group was fed a diet containing 40 mg Fe/kg as ferrous su...

• Effects of carbonate and phosphate on ferrihydrite transformation were investigated. Carbonate can override the retarding impact P transformation. promoted formation more crystalline rhombic hematite particles. Phosphate serve a different role in cycling nutrients & metals. In soils rhizospheres, iron (oxyhydr)oxides oxyanions like occur ubiquitously their interaction have important implicati...

phosphorus is an essential element for plants. much of the agricultural lands of iran has calcareous soils, in which, due to high ph, phosphorous availability is less, therefore, it appears as a limiting factor for plant growth. application of biofertilizers instead of chemical ones has gained attention in order to produce healthy crops, reduce pollution of soil and water resources by reducing ...

As part of a systematic investigation for a number of Fe(II) porphyrin complexes used as biomimetic models for cytochrome P450, crystals of the title compound, [K(C(18)H(36)N(2)O(6))][Fe(II)(C(64)H(64)N(8)O(4))(HS)], were prepared. The compound exhibits a non-planar conformation with major ruffling and saddling distortions. The average equatorial iron-pyrrole N atom [Fe-N(p) = 2.102 (2) Å] bond...

This study evaluates the arsenic adsorption behavior of Fe-exchanged smectite and phosphate-bound kaolinite, in soil, tap water double distilled presence competing anions such as silicate, phosphate, sulfate, at variable pH values. The maximum amounts As adsorbed soil are 620.6 607.6 µg g–1 5 by respectively. pH-modified Freundlich equation fits well (R2 > 0.96) to data, distinguishing effect o...

The ferri-reductase activity of whole cells of Saccharomyces cerevisiae (washed free from the growth medium) was markedly increased 3 to 6 h after transferring the cells from a complete growth medium (preculture) to an iron-deficient growth medium (culture). This increase was prevented by the presence of iron, copper, excess oxygen, or other oxidative agents in the culture medium. The cells wit...