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Zinc Recovery from Wastes

  A Multilevel Sustainability Analysis of Zinc Recovery from Wastes Zinc is important transition metal which has wide range of applications in different fields of life. A specific amount of zinc is required to human body for healthy growth and its deficiency cam cause adverse effects to human health. Zinc is an important nutrient for plant growth. Deficiency of zinc in plants can results in discolouration of leafs and decreases in crop yield. Zinc is important element in steel coating (galvanising) due to its corrosion resistant properties. Zinc combines with other elements to form different alloys (like Bronze and Brass) which have various applications. Almost 50% of total zinc is utilised in galvanising, 17% is used for alloying such as die casting and similar percentage is used for making bronze and brass. Other applications include roofing, gutters and construction purposes (6%), as chemicals (6%) and miscellaneous (4%). The world consumption of zinc is increasing 4.7% per year
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Red Mud uses from Alumina Production

  Review on utilization of Red Mud Red mud is solid waste which is produced as residue during the manufacturing of alumina . Alumina is produce from bauxite ore. About 35-40% of bauxite is converted into waste as alkaline red mud during alumina production which contains 15-40% solid. A large amount of red mud is produced every year during alumina production. Red mud is discharged on to the ground as slurry near production plant, in ponds or nearby sea. It contains several metal oxides like Fe 2 O 3 , Na 2 O, SiO 2 , CaO, and Al 2 O 3. Red mud has alkaline pH greater than 10. Due to presence of heavy metals and alkaline pH, the disposal of huge amount of red mud lead to serious environmental problems like soil contamination, ground water pollution and particle suspension in sea. Also disposal of red mud cost very high. Therefore it is necessary to find alternative solution for red mud solid waste so that it cannot cause harmful effects to environment.   Alumina is produced by
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steroids

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Biosynthesis of Steroids Defi nition     A steroid is a biologically active organic compound with four rings arranged in a specific molecular configuration. Steroids have two principal biological functions: as important components of cell membranes which alter membrane fluidity; and as signaling molecule. Classification     Sterols     Bile acids     Vitamin D     Male sex hormones     Female sex hormones Structure Composed of: seventeen carbon atoms, bonded in four "fused" rings: three six-member cyclohexane rings Function  steroids have two principal biological functions:Important components of cell membranes which alter membrane fluidity Act as signaling molecules.Biosynthesis of sterols Biosynthesis of cholesterol Synthesis of mevalonate from acetate  Conversion of Mevalonate to Two Activated Isoprenes  Condensation of Six Activated Isoprene Units to Form Squalene Conversion of Sq
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Leukemia, Introduction, Classification, Diagnosis, Causes, Treatment

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  Leukemia   l Introduction l Causes l Classification l Symptoms l Diagnosis l Treatment  
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