their removal from the body. Chelation is widely used to expel excess or toxic substances metals from the body before they can cause any damage to the body. Chelation Therapy works on the principle that when a complex amino acid called Ethylenediaminetetraacetic acid (EDTA)‚ comes into contact with various positively charged heavy metals such as zinc‚ copper‚ magnesium‚ iron and calcium; it clings to the metal ions and forms a stable ring like structure. This compound is expelled through the body
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hobby of metal detecting‚ the best way to develop the basic skills necessary and be successful in finding objects that are desirable is to purchase a beginner metal detector. While there are many metal detectors available on the market‚ the most suitable type for beginners are detectors that are simple to use and do not have a lot of advanced features and functions that can be confusing and overwhelming to the beginner. If you are interested in getting started in the enjoyable hobby of metal detecting
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V+5 and why? (1) 5 How cathode rays are originated in the discharge tube and how their origin differs from the origin of anode rays? 6 When is a cation highly polarizing? Which alkali metal has the highest polarizing power? (1) 7.Why is KO2 paramagnetic? (1) 8 Potassium and Caesium are used in photoelectric cells
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an irritant. Group 2 elements Calcium Strontium Magnesium Beryllium Barium Radium Introduction: The Group 2 elements are all metals with a shiny‚ silvery-white colour having 2 electrons in their outermost shell. The alkaline earth metals are high in the reactivity series of metals‚ but not as high as the alkali metals of Group 1. The metals of Group 2 are harder and denser than sodium and potassium‚ and have higher melting points. These properties are due largely to the presence of
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other alkali metals. Because these elements are very similar chemically‚ their separation presented numerous problems before the advent of ion-exchange methods and ion-specific complexing agents such as crown ethers. Once pure salts have been prepared‚ it is a straightforward task to convert them to the free metal. This can be done by electrolysis of the fused cyanide or by reduction with calcium or sodium followed by fractional distillation. Properties Rubidium is an alkali metal in group IA of
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Mary Lastes Professor DeSouza College Writing 29 March 2013 1. Different Genres of Metal Music 2. American Writers and Poets I feel either one of these topics would work well because I have a great love of music. Through my life since I was nine years old‚ I have seen a lot of Rock bands perform and have felt a close connection with them through their music. When writing I prefer to brainstorm‚ because I think about how the reader would get the most pleasure and knowledge from
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Chemistry And Environment‚ Vol. 7 (4) Dec. (2003) Res. J. Chem. Environ. Review Paper: Biosorption of Heavy Metals N. Ahalya‚ T.V. Ramachandra*l and RD. Kanamadi2 1. Centre for Ecological Sciences‚ Indian Institute of Science‚ Bangalore 560 012‚ INDIA. 2. Department of Zoology‚ Karnataka University‚ Dharwad‚ INDIA. Abstract: The discharge of heavy metals into aquatic ecosystems has become a matter of concern in India over the last few decades. These pollutants are introduced
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Observations Element Observations Metal or Non-Metal Sodium -Lustrous -Forms oxides on surface rapidly -A soft metal -silvery-white colour Metal Magnesium -Lustrous -Forms oxides on surface -Silvery-white colour -Malleable but less than alkali metals Metal Aluminium -Silvery-white metal -Malleable but less than alkali earth metals -Forms oxide on surface Metal by observation‚ metalloid by properties Sulphur -Soft pale-yellow powder -It is odourless Non-metal Reactions with water:
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exam) There are two key reasons for using thermoplastic composites: * save time & handling costs in production * eliminate labour-intensive riveting & bonding * can produce large profile sections that are some 20 % lighter than metal & alloys. * materials are exceptionally stiff and can tolerate vibrations A380 (largest passenger plane) - 25 % of the structure & components are composites. And in the next generation of aircraft‚ the content of composites will double
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present age there is a rapid increase of contaminants in the environment‚ but one of the major global concerns is the heavy metal concentrations in the environment as a result of man’s activities and since the biosphere is a closed system this heavy metals remains on earth and continuously increase as the human population increase. The acute and chronic effects of these heavy metals especially lead have been a worldwide concern. In fact in April 2000 the use of leaded gasoline was phased out in Metro
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