Crystal structures of sodium magnesium selenate decahydrate, NaMg(SeO)·10HO, a new selenate salt, and sodium magnesium selenate dihydrate, NaMg(SeO)·2HO.

Metal selenates crystallize in many instances in isomorphic structures of the corresponding sulfates. Sodium magnesium selenate decahydrate, NaMg(SeO)·10HO, and sodium magnesium selenate dihydrate, NaMg(SeO)·2HO, were synthesized by preparing solutions of NaSeO and MgSeO·6HO with different molar ratios. The structures contain different Mg octahedra, i.

Similarities and peculiarities between the crystal structures of the hydrates of sodium sulfate and selenate.

The crystal structures of the two hydrates Na2SeO4·10H2O and Na2SeO4·7.5H2O are studied for the first time. The structures of Na2SO4·10H2O and Na2SO4·7H2O are reinvestigated as a function of temperature with respect to the degree of disorder of the O atoms of SO4(2-) in the decahydrate and the O atom of water in the heptahydrate.

Biomimetic transformations of amorphous calcium phosphate: kinetic and thermodynamic studies.

The biomimetic synthesis and phase transformation of XRD amorphous calcium phosphate were studied by application of kinetic, chemical and spectral (XRD and IR) methods and thermodynamic simulations. Two SBFs (SBFc and SBFr), differing in their HCO(3)(-) and Cl(-) ion contents, were used in the maturation studies. It has been proven that the biomimetic maturation accelerated the phase transformation of less thermodynamically stable amorphous calcium phosphate to poorly crystalline hydroxyapatite.

The effect of excess dietary manganese on uninfected and Ascaridia galli infected chicks.

The effect of dietary manganese from two different sources on chicks (uninfected and infected with Ascaridia galli) was studied. Chick diet was supplemented with 0.9 g Mn2+ kg-1 food either in the form of MnSO4.