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Enzymes are major components of organism defense against toxic chemicals in their environment. Despite the passage of more than 200 million years of life presence these enzymes now play an important role in detoxifying chemicals man-made addiction and it may be a useful biomarker. Lactate dehydrogenase (LDH or LD) is intracellular enzyme year found early in all living cells (animals, plants, and prokaryotes). LDH catalyzes the conversion of pyruvic acid to lactic acid and back, as it converts NAD + to NADH and bac...

In the paper there is the analysis of the possibility of the replacement of onerous methods of surface treatment before adhesive bonding. In ecology approach adhesive bonding is not preferred techniques of joying parts. The joints are no separable, but nonetheless have wide range of usage. The adhesive bonding has many assets, like low mass of the joining elements (less material), possibility of joint of different materials, lack of rivets or screws (less weight). But typical preparatory operations in adhesive bon...

The paper considers the issue of effective scale inhibitor applied while developing an oilfield using steam assisted gravity drainage technique, and presents a case study of injecting superheated steam of 140-160?C in the Ashalchi oilfield. In such conditions, organophosphorus chelating agents conventionally used to prevent scale formation degraded and proved to be ineffective. The authors analyzed chemical composition of scales deposited on the electric submersible pump pulled from one of the wells in the Ashalch...

At present, scale control through chemical inhibition is the preferred method in oil recovery though the principle of chemical agent action is still considered complex and not fully understood. An important issue that needs to be addressed is associated with compatibility of techniques and their impact on the reservoir and borehole zone. Scale control solutions remove deposits effectively and inhibit their formation, reducing costs associated with scale cleanup and disposal, while helping increase production and p...