The hydr6lysis of a series of substituted anilides of Nacetyl-L-tyrosine by cY-chymotrypsin has been investigated. Values of the kinetic parameters have been obtained in water and deuterium oxide solvent systems. It has been shown that the isotope effect decreases as the basicity of the substrate is increased. pH dependence studies have shown that the rate of hydrolysis, kz, is independent of p...

Electrospray ionization mass spectrometry is a critically important technique for the determination of small molecules, but its application for this purpose is complicated by its selectivity. For positive ion ESI-MS analysis of basic analytes, several investigators have pointed to the importance of analyte basicity as a source of selectivity. Currently, however, it is not known whether basicity...

This paper examines two mold powder related process problems experienced at BHP's Whyalla operations. Bands of deep transverse depressions extending about the perimeter of the strand in the first meter of cast product were identified as a potential cause of breakouts. These were associated with level drops in the mold during startup that allow sintered material to accumulate against the mold wa...

Kambara Reactor (KR) desulfurization slag used as slag-making material for converter smelting can promote early melting in the initial stage and improve efficiency of dephosphorization. However, its direct utilization a slagging increase sulfur content molten steel since KR contains 1~2.5% sulfur. Therefore, this research focuses on effect basicity precipitation behavior occurrence state order ...

The structures of lithium 4-fluoro-, 4-chloro, 2and 4-bromo-, 4-(trifluoromethy1)-, 4-methoxy-, 2-methyl-, 2-ethyl-, 2-n-propyl-, 2-isopropyl-, 2-tert-butyl-, 2-(methoxymethyl), 3,5-dimethyl-, 3,5-dimethyl-4-methoxy-, 4-chloro-3,5-dimethyI-, 3,5-diethyl-, and 3,5-dimethoxyphenolates in solution in weakly polar, aprotic solvents such as pyridine, tetrahydrofuran, dimethoxyethane, 1,3-dioxolane, ...

The concept of optical basicities initially developed by Duffy for solid oxides was successfully transferred to low melting salts such as ionic liquids (ILs). Several ionic liquids (ILs) were doped with Mn(NTf(2))(2) (NTf(2) = bis(trifluoromethanesulfonyl)imide) as a probe to investigate the IL anion basicity by means of UV-Vis spectroscopy. The (6)A(1)-->(4)A, (4)E(G) transition band of Mn(2+)...

The phosphorus partition between the unkilled liquid crude steel and high basicity (CaO/SiO2 = 4.2), basic oxygen furnace (BOF) slags with varying compositions of Al2O3, TiO2, MnO is studied at temperatures 1600 1650 °C. tests are conducted in both “slag-to-metal” “metal-to-slag” directions for durations 30 60 min. measured results compared values reported literature found to be good agreement ...

A correlation between acid-base properties and volatility parameters (temperature enthalpy of vaporization) fluorides s-, p-, d-metals was revealed. As a characteristic properties, the basicity parameter proposed in work, based on size-charge characteristics ions that make up compound, is taken. The value naturally decreases from low-valent metals (I–III) to highvalent (IV–VII). indicated catio...

The chemical surface of Santa Barbara Amorphous-15 (SBA-15) was functionalized with polyaniline (SBA-15/PA) and prepared using aniline ammonium persulfate as the modifying agent oxidant. samples were characterized by N2 physical adsorption at 77 K. SBA-15′s area 654.5 m2 g−1, changing to 254.6 g−1. total acidity basicity determined a modified Boehm’s method, point zero charge pH (pHpzc) determi...

double system of exponents with complex-valued coefficients is considered. under some conditions on the coefficients, we prove that if this system forms a basis for the morrey-lebesgue type space on $left[-pi , pi right]$, then it is isomorphic to the classical system of exponents in this space.