Growing CO2 emissions lead to global warming, which is currently one of the most challenging environmental phenomena. Direct catalytic hydrogenation dimethyl ether over hybrid catalysts enables utilization, hydrogen and energy storage produces sustainable fuels an important platform molecule. In this paper, we evaluated structure–performance correlations in bifunctional copper–zinc SAPO-34 for ...

The all-alkyl α-tertiary amino acid scaffold represents an important structural feature in many biologically and pharmaceutically relevant molecules. Syntheses of this class molecule, however, often involve multiple steps require activating auxiliary groups on the nitrogen atom or tailored building blocks. Here, we report a straightforward, single-step, modular methodology for synthesis esters....

An alumino-silicate zeolite, Linde Type-A (LTA) has been prepared from aluminium powder and sodium metasilicate by hydrothermal process. The zeolite was characterized by FTIR and X-ray diffraction (XRD) analysis and by measuring the surface acidity using KOH as adsorbate. The surface acidity of LTA zeolite varied greatly with varying synthesized conditions such as crystallization temperature, c...

A new rapid and versatile approach using Ionic Liquid/DMSO as a chemical reagent for the synthesis of fused heterocyclic compounds in a highly efficient way is described. This method offers the advantages of proceeding in neutral conditions, giving high to excellent isolated yields (83-92%) for Niementowski synthesis with easy workup procedure. The inherent Bronsted acidity of ionic liquid and ...

Rotation about the C-N bond in amides can be catalyzed by Bronsted and Lewis acids, as well as nucleophiles and bases. Catalysis of amide isomerization occurs in biological systems via "rotamase" enzymes; however, the mechanisms by which these proteins operate are not completely understood. We outline investigations that provide experimental support for mechanisms believed to be feasible for th...

abstract objective: it has been reported that adenosine deaminase (ada) is a good marker for insulin function but its clinical significance in type 2 diabetes mellitus (t2dm) is not yet characterized. this study aims to assess the association of ada with glycated hemoglobin (hba1c) and uric acid (ua) in t2dm patients. materials and methods: the study population consisted of 120 subjects divided...

Synthesis and overexpression of a gene encoding Escherichia coli UDP-galactose 4-epimerase and engineered to facilitate cassette mutagenesis are described. General acid-base catalysis at the active site of this epimerase has been studied by kinetic and spectroscopic analysis of the wild-type enzyme and its specifically mutated forms Y149F, S124A, S124V, and S124T. The X-ray crystal structure of...

objective: type 2 diabetes mellitus (dm-2) is a chronic and progressive metabolic disorder known as a serious threatening condition in the individual and society. type 2 diabetes mellitus is known as the major cause of cardiovascular diseases (cvd). contradictory evidences about the effect of omega-3 fatty acids on cvd risk factors, particularly hypertension. the aim of this study was to determ...