In this study, sulfated tin oxide was modified with cobalt oxide and aluminium oxide resulting in sulfated cobalt-tin (SO42-/Co2O3-SnO2) and sulfated aluminium-tin (SO42-/Al2O3-SnO2) mixed oxide catalysts, respectively. Their catalytic activities for esterification of free fatty acids (FFA) in c...

We have obtained a set of sample crystals of the family of Tutton’s salt comprise in the isomorphic series with general chemical formula (NH4)2NixCo(1−x) (SO4)2·6H2O, by employing growth from solutions by slow evaporation technique. The samples crystals were characterized by ICP-AES, X-ray pow...

The oxidation of thiols in petroleum is a subject of ongoing research, discussion and removal of sulfur is a topic of ongoing legislation. The Merox® process requires high pressures and temperatures. Novel catalysts and methods innovations are of interest. This work examines the synthesis, purif...

The removal of cobalt from zinc sulfate leach solutions by copper and arsenic activated cementation on zinc powder prior to zinc electrowinning was studied by considering the thermodynamics and kinetics of the cementation process. Arsenic increases the thermodynamic driving force for cobalt ceme...

Self-sacrificial biomass-derived silica is a rising and promising approach to fabricate large metal silicates, which are practical water treatment agents ascribed for easy sedimentation and separation. However, the original biomass architecture is difficult to be maintained and utilized. Further...

Optimization of the Mediated Electrochemical Oxidation (MEO) for destructing a dissolved organic compound has been studied. The experiment was carried out in a 100 mL electrolytic cell equipped with a rotameter, an outlet tube of “tetradent” designs, a collecting tube, a stabilized DC power su...

In the zinc sulfate solution, the concentration ratio of zinc to metal ion impurities can be up to 105, which causes impurity ion signals to be severely masked by the zinc signal. In particular, nickel exhibits a strong nonlinearity. Conventional spectroscopic methods are commonly used to detect...

The preparation of several 21-chloro-11β-hydroxy-16ga, 17α-acetonides is described. The preparation of the analogous 9α, 11β-dichloro-acetonides is also given. The thymolytic activities of these compounds are discussed and tabulated.

Binding of [3H]triamcinolone acetonide (TA) increased with prolongation of incubation periods of up to 5 h after the onset of incubation at 2°C, with a plateau thereafter persisting for at least up to 48 h in brain cytosol fractions of rats with intact adrenals. Elevation of incubation temperat...

The metabolic fate of 9-fluoro-11β,16α,17,21-tetrahydroxy-l, 4-pregnadiene-3,20-dione cyclic 16,17-acetal with 2-14C-acetone, triaacinolone acetonide (TA) was studied in rabbits, dogs, monkeys and rats and found to be qualitatively similar in all species. In the dog, rat and monkey the major e...

Nodosin, the aglycone of nodososide extracted from the flowers of Cassia nodosa, has been determined quantitatively in micro amounts by oxidation with an excess of ceric sulfate in highly acidic medium. The reaction between nodosin and ceric sulfate takes place at 32 equivalence and results in t...

Natural products derived from herbal medicines have become a major focus of anti-cancer drug discovery studies. Acetyl-macrocalin B (A-macB) is an ent-diterpenoid isolated from Isodon silvatica. This study aimed to examine the effect and molecular action of A-macB in esophageal squamous cell car...

Two new structural isomers – 2,4-dimethyl-5-[methyl(phenylsulfonyl)amino]benzenesulfonyl chloride (1) and 2,4-dimethyl-3-[methyl(phenylsulfonyl)amino]benzenesulfonyl chloride (2) were synthesized by interaction of N-(2,4-dimethylphenyl)-N-methyl-benzenesulfonamide or N-(2,6-dimethylphenyl)-N-me...

The compound 4-(Phenylsulfonyl) morpholine belongs to the class of sulfonamides, which are widely used in the treatment of a large number of diseases caused by microorganisms. This compound has a morpholine group, which is also known for its antimicrobial properties. The aim of the present study...

The use of gas-liquid chromatographic (GLC) retention indices for the determination of lipophilicity was studied for a series of alkyl and arylalkyl esters of substituted benzoic acids. The regression relationships between the logarithms of the partition coefficients and the retention characteri...

Protoporphyrinogen oxidase (PPO, E.C. 1.3.3.4) is the action target for several structurally diverse herbicides. A series of novel 4-(difluoromethyl)-1-(6-halo-2-substituted-benzothiazol-5-yl)-3-methyl-1H-1,2,4-triazol-5(4H)-ones 2a–z were designed and synthesized via the ring-closure of two or...

Catechol quinones of estrogens react with DNA by 1,4-Michael addition to form depurinating N3Ade and N7Gua adducts. Loss of these adducts from DNA creates apurinic sites that can generate mutations leading to cancer initiation. We compared the reactions of the catechol quinones of the leukemogen...

Bisphenol A is a monomer used in the manufacture of polycarbonate plastic products, epoxy resin-based food can liners and flame retardants. To determine the genotoxic potential of bisphenol A, the mechanism of the reactions between the reactive electophilic bisphenol A 3,4-quinone (BPAQ) with gl...

The nonsteroidal synthetic estrogen hexestrol (HES), which is diethylstilbestrol hydrogenated at the C-3–C-4 double bond, is carcinogenic. Its major metabolite is the catechol, 3′-OH-HES, which can be metabolically converted to the catechol quinone, HES-3′,4′-Q. Study of HES was undertaken w...

A variety of evidence has been obtained that estrogens are weak tumor initiators. A major step in the multi-stage process leading to tumor initiation involves metabolic formation of 4-catechol estrogens from estradiol (E2) and/or estrone and further oxidation of the catechol estrogens to the cor...