objective: application of chemical solvents especially in problematic canals is usually a part of the retreatment process.this study was performed to compare the solubility of gutta- percha and resilon in chloroform and to find the effect of sample thickness as well as the time of shaking on their solubility. materials and methods: specific weight of resilon and gutta-percha was placed in a sam...

background: trinitrotoluene (tnt) is one of the most well-known and oldest explosive agents. in the recent decade, bioenvironmental, biochemical, and biological effects of tnt exposure have been more in the spotlight. in this study, we aimed to evaluate spirometric parameters in workers of a tnt factory exposed to tnt and other related fumes and dusts compared with the unexposed controls. metho...

background: chemicals are among risk factors that can affect women's reproductive system. this study is aimed to investigate the association of occupational exposure to a mixture of organic solvents with menstruation disturbances and hormonal changes among female workers. methods : female workers of a pharmaceutical company were divided into three groups of non-exposed, low-exposed and highly-e...

The cationic functionalisation of cellulose is of considerable industrial importance and has found applications in the paper industry, cosmetics, textiles, in flotation and flocculation and in drilling fluids. In particular, it is used in the removal of acidic dyes from aqueous effluent produced by the textile industry, which significantly reduces the environmental impact of such processes. The...

Cellulose hydrolysis to glucose using a heterogeneous catalyst is necessary step in producing bio-based chemicals and polymers. The requirement for energy-intensive pretreatments, such as ball milling, increase the reactivity of cellulose one major issues this area. Here, we show that by solvent-assisted adsorption pretreatment step, can be adsorbed on surface carbon catalyst. For pretreatment,...

In this review, the effect of organic solvents on microalgae cultures from molecular to industrial scale is presented. Traditional organic solvents and solvents of new generation-ionic liquids (ILs), are considered. Alterations in microalgal cell metabolism and synthesis of target products (pigments, proteins, lipids), as a result of exposure to organic solvents, are summarized. Applications of...

A novel esterase gene (estSL3) was cloned from the Alkalibacterium sp. SL3, which was isolated from the sediment of soda lake Dabusu. The 636-bp full-length gene encodes a polypeptide of 211 amino acid residues that is closely related with putative GDSL family lipases from Alkalibacterium and Enterococcus. The gene was successfully expressed in E. coli, and the recombinant protein (rEstSL3) was...

ologically important products proceeds efficiently through the action of enzymes without requiring protection of reactive functional groups. However, only a few studies of synthetic reactions using unprotected (free) amino acids have been reported. Most of the synthetic transformations to natural products, pharmaceuticals, and chiral auxiliaries have been performed with protected amino acids to...

The rate of denaturation of hemaglobin and other proteins by mechanical shaking is strongly affected by organic solvents. A group pf solvents,including alcohols and ketones, was found to stabilize proteins at low concentrations, although these same organic solvents denatured proteins at high concentrations. The stabilizing effect of alcohols increased with increasing chain lenghts. The second g...