considering the water scarcity in iran and the importance of environmental protection, it is approperiate to investigate the environmental management of siah-rud river. it is a small river being utilized as discharge channel by factories located in the vicinity of the river. the physico-chemical characteristics of river water at 10 different sampling locations 'along with coefficient of ae...

abstract chemical components of narcissus (narcissus tazetta l.) essential oil investigated under farming and natural habitat conditions in south khorasan province. the essential oil was obtained using solvent extraction method. after purification, the oil was analyzed by capillary gc and gc/ms. 12 compnents making 82/82% of total oil in farm sample and 13 components making 63/86% of total oil ...

Graphene films were fabricated over synthesized MCM-41 nanocatalyst by chemical vapordeposition method, and the reaction was carried in atmospheric pressure at 750˚C. Acetylenegas used as a carbon precursor and the synthesis reaction took place in hydrogen atmosphere.Mesoporous MCM-41 was synthesized at room temperature, using wet chemical method. Thesynthesized metal free catalyst was characte...

Self-purification plays an important role in water regulating ecosystem services aimed at protecting river quality from pollutant inputs. The Citarum River is the longest West Java, Indonesia where has declined due to inputs domestic and non-domestic activities. This study aims investigate status of self-purification influence upstream River, Cihawuk Majalaya segments, which are rural urban are...

To make more practical the total chemical synthesis of proteins by the ligation of unprotected peptide building blocks, we have developed a method to facilitate the isolation and handling of intermediate products. The synthetic technique makes use of a His6 tag at the C terminus of the target polypeptide chain, introduced during the synthesis of the C-terminal peptide segment building block. Th...

Preparation of the toxin pyocyanin from the bacterium Pseudomonas aeruginosa is an exacting procedure. Pyocyanin is expensive to commercially purchase. The sellers do not give out the extraction procedure. Classically, pyocyanin preparation involves complicated multi-step P. aeruginosa culturing and solvent transfer extractions. The chemical synthesis first used (1979) has not been adequately d...

Calcitonin was extracted from the ultimobranchial gland of salmon in quantities sufficient to permit purification and chemical characterization. The partially purified extract was subjected to gel filtration and ion exchange chromatography. Purification was monitored by bioassay of column e&tents against a standard prepared from the starting material. These methods led to detection of two chemi...

Sucrose (alpha-D-glucopyranosyl-(1-->2)-beta-D-fructofuranoside) is an inexpensive chemical produced by sugar cane and sugar beet cultivation. Chemical and/or biochemical transformations convert it into highly valuable synthetic intermediates such as 5-hydroxymethylfurfural (HMF), bioethylene, 1,2-propylene glycol and levulinic acid. Sucrose can also be converted into biodegradable polymers suc...