The production of biomethane from biogas energy costsfor the most widely used amine and water processes for extracting carbon dioxide were analyzed using computer simulation. Combined water-amine absorption method purification CO2 wasincluded in comparative analysis.
 For content 32 to 42 %, specific costs when extract are, on average, ~ 2.5 times lower than absorption, but loss CH4 by was...

In the article are considered influence of modification quartz loading contact clarifiers on degree structural and mechanical hydration aluminum hydroxide in water treatment processes. Modification molecular structure surface grains filter charge increases dirt capacity performance structures. For materials can be used coagulants. allows with minimal cost to increase station plants, improve qua...

phenylalanine dehydrogenase (phedh; ec 1.4.1.20) is an important enzyme of amino acid dehydrogenases family that increasingly used as a valuable biocatalyst in neonatal screening kits and synthesis of l-phenylalanine. the goal of this literature was to find a suitable purification method for recombinant bacillus badius phedh by practical comparison between chromatographic and polyvinyl pyrrolid...

two peroxidases (ec. 1.11.1.7), pod i and pod ii were purified from the roots of cultivatedraphanus sativus l. var. cicil by one step ion-exchange chromatography after fractionation by acetone. the molecular weight of these enzymes were 43000 and 41000 daltons and rz 1.2 and 2.0 for pod i and pod ii, respectively. both enzymes consisted of a single polypeptide chain on sds-page. the maximum act...

transferrin acts as a vehicle for iron transportation between the absorption, storage and utilization sites in the body and, besides iron, its two highaffinity iron-binding site are capable of binding to 29 other elements. in physiological and pathophysiological conditions, transferrin’s properties are different and close attention to these properties is required. for further investigation for ...

introduction: cost estimation is a important tool which assist the managers to plan and to control the economic functions of the organization. the present study aims to identify the cost of a cesarean surgery in one of the first class public hospitals in iran. methodology: reviewing all expenses of the hospital documents in the financial unit, the cost of a cesarean surgery was determined throu...

Available online 1 April 2009

Treatment of domestic wastewater, at both the village and urban level, remains a problem in most developing countries. This is a review paper illustrating the use of duckweed-based wastewater treatment systems that provide genuine solutions to these problems. They are inexpensive to install as well as to operate and maintain. They do not require expensive technologies. Therefore, this review pa...

A number of years ago the Green Chemistry Centre of Excellence at York discovered new high surface area forms of polysaccharides. Further study of these materials has found that after controlled thermal treatment they exhibit remarkable thermal properties, which have enabled us to make an entirely new class of materials with properties ranging from starch-like to carbon-like (see figure 1). Tra...

recombinant protein purification is a kind of sensitive and expensive method in genetics engineering. genetic manipulation leads to the expression of various proteins; it should be isolated with high purity finally. differed methods for protein purification are categorized, based on cast, quality, easy work and side effect of protein. in this article, we are investigating his his-tag protein pu...