Highly solvated methylated guanidinium ions ([Me nGuan(H2O)m](+); n=0-4 and 6; m=1->50), which model the various post-translationally methylated states of arginine, were generated in the electrospray ionization (ESI) source of an unmodified commercial tandem mass spectrometer. The dehydration processes of highly solvated [Me nGuan(H2O)21](+) ions were monitored by using energy-dependent ESI MS....

BROOKFIELD [1933] showed that in the serum of the rabbit there was an inverse relationship between calcium and magnesium, a direct relationship between magnesium and inorganic phosphorus and an inverse relationship between calcium and inorganic phosphorus, the latter of which had been previously observed by Dupre and Semeonoff [1931] and Bourne and Campbell [1932]. The rises and falls in the co...

X-ray crystallographic studies indicate that there are at least four site-specifically bound hydrated Mg 2 + ions, [Mg(H20)n] , in yeast tRNA. The size and the octahedral coordination geometry, rather than the charge, of [Mg(H2O)n] 2+ appear to be the primary reasons for the specificity of magnesium ions in site-binding and in the stabilization of the tertiary structure of tRNA.

Two novel metal pyridylmethylphosphonates, namely, [Co(4-pmp)] (1) and [Cu(4-pmp)(H2O)] (2), (4-pmpH2 = 4-pyridylmethylphosphonic acid), have been hydrothermally synthesized and characterized by X-ray diffraction, infrared spectroscopy, elemental analysis, and thermogravimetric analysis. In compound 1, each {PO3C} tetrahedron is corner-shared with three {CoNO3} tetrahedra and vice versa, thus f...

The effects of H2O vapor introduced during focused ion beam ~FIB! milling of diamond~100! are examined. In particular, we determine the yield, surface morphology, and microstructural damage that results from FIB sputtering and H2O-assisted FIB milling processes. Experiments involving 20 keV Ga bombardment to doses ;10 ions/cm are conducted at a number of fixed ion incidence angles, u. For each ...

24-hour samples of pm1 (submicron particles, aerodynamic diameters ≤1 μm) and pm2.5(fine particles, aerodynamic diameters ≤ 2.5 μm) were collected at a quasi-rural area in racibórz (1 january-30 june 2011). the samples were analysed for carbon (organic and elemental), water-soluble ions (na+,nh4 +, k+, mg2+, ca2+, cl-, no3 -, so4 2-) and concentrations of 21 elements with a carbon analyser (sun...

Yeast inorganic pyrophosphatase was found to bind two Mn2+ per subunit in the absence of phosphate and three Mn2+ per subunit in the presence of phosphate. Kinetic studies of the pyrophosphatase-catalyzed hydrolysis of Cr(NH3)4PP and Cr(H2O)4PP were carried out with Mn2+ and with Mg2+ as activators. The results from these studies suggest that three divalent cations per pyrophosphatase active si...

Reported here is, for the first time, an important study of solvent effect on structural diversity in inorganic-organic mercury(II) complexes. As a result, the first supramolecular isomer in mercury(II) complexes is obtained. Importantly, a previously unobserved in situ generation of both inorganic (Cl(-)) and organic ([CH(3)-L1-CH(3)](2+)) ions was also observed.

Copper(II) complexes with 2,3,4-trimethoxybenzoic acid (H234-tmbz) and 2,4,6-trimethoxybenzoic (H246-tmbz), [Cu2(234-tmbz)4(H2O)2] (6) [Cu(246-tmbz)2(µ-H2O)2(H2O)2]n (7), were synthesized characterized by elemental analysis, infrared UV-vis spectra temperature dependence of magnetic susceptibilities (1.9–300 K). The X-ray crystal structures revealed that the former 6 is a dinuclear cluster havi...

Background and aims: The removing of (potential) toxic heavy metal ions from sewage, especially in industrial and mining waste effluents, has been widely studied in recent years. The aim of present study was to investigate the various methods for lead removal of lead ions from industrial wastewater. Methods: This study was a review research. Data were collected through different databases in va...