A novel nucleoside phosphorylation process using the food additive pyrophosphate as the phosphate source was investigated. The Morganella morganii gene encoding a selective nucleoside pyrophosphate phosphotransferase was cloned. It was identical to the M. morganii PhoC acid phosphatase gene. Sequential in vitro random mutagenesis was performed on the gene by error-prone PCR to construct a mutan...

The chemical oxidative polymerization of 2-aminothiazole (AT) was studied in aqueous solution using copper chloride (CuCl2) as an oxidant. The effect of varying the reaction temperature, reaction time and oxidant/monomer molar ratio on the polymer yield was investigated. The resulting poly(2-aminothiazole)s (PATs) were characterized by FTIR, 1H NMR, UV-vis, gel permeation chromatography, scanni...

The most commonly used method for biodiesel preparation is via transesterification of vegetable oil using alkaline catalysts. Biodiesel yield and oil conversion are affected by operating conditions including the catalyst formulation and concentration. Application of alkaline catalysts can also lead to undesired soap formation. This study evaluated the alkaline catalyst effects on biodiesel yiel...

This paper presents the results of detailed studies possibility using Lewis acid AlCl3as a promoter catalytic three-component system PdCl2(PPh3)2–PPh3–AlCl3in hydroethoxycarbonylation reaction cyclohexene at low carbon monoxide pressures (2.5 MPa). As result high activity was established and proceeds regioselectively with formation ethyl ether cyclohexanecarboxylic acid. The optimal conditions ...

This thesis project aimed to fractionate cornstalk into cellulose and lignin, and utilize the crude cornstalk-derived cellulose for the production of sodium carboxymethyl cellulose and the lignin for the sybthesis of bio-based phenol-formaldehyde resole resins as wood adhesives. In this thesis work, cornstalk was efficiently fractionated into crude cellulose and crude lignin in mixed solvents o...

The densities of 12 melts in the Na20-FeO-FezOrSi02 system have been determined in equilibrium with air, in the temperature range of lOOO15OO”C, using the double bob, Archimedean technique. Ferrous iron determinations of 100-200 mg samples, “dip” quenched from high temperature, indicate that all the melts investigated were highly oxidixed under these experimental conditions. “Fe Massbatter spec...

Bacterial levan has gained an increasing interest over the last decades due to its unique characteristics and multiple possible applications. Levan and other exopolysaccharides (EPSs) production are usually optimized to obtain the highest concentration or yield while a possible change of the molecular size and mass during the production process is mostly neglected. In this study, the molar mass...

Polyphenylsulfone was thermally aged at temperatures corresponding to its processing and mainly shown undergo crosslinking as observed by measurements of average molar mass, rheometry changes in glass transition temperature. Those experiments were completed mechanical testing thin sample films 250 280 °C. The same degradation mechanisms result a strong decrease ultimate strain accompanied sligh...

A strongly basic ion-exchange resin catalyst was reported to exhibit a high catalytic activity in transesterification produce bio-based surfactant, sugar ester under mild condition. However, the side-reactions decompose reactant and product were found occur. This study aimed improve selectivity of synthesis by newly focusing on basicity resin. weakly (Diaion WA20) with lower mass transfer resis...