conventional methods (trial and error). • By using molecular modelling‚ only molecules that fit with the active sites’ of the target are made and undergo clinical test. • Molecular modelling also used to design many other compounds like pesticides and polymers with specific characteristics. A Brief History of HIV-AIDS • Early on 1988 X-Ray Crystallography were used to determine the shape of HIV protease. • Discovery of a molecule that block its active site is a one step to the cure. • By
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major difference is between natural and synthetic compounds. Organic compounds can also be classified or split by the presence of heteroatoms‚ such as organometallic compounds which show bonds between carbon and a metal‚ and organ phosphorusHYPERLINK "http://en.wikipedia.org/wiki/Organophosphorus_compound" compounds which are bonds between carbon and phosphorus. Another difference‚ based upon the size of organic compounds‚ separates small molecules and polymers. Natural compounds are produced by
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Rubber Band Powered Vehicle Part A: Introduction a. Theoretical Background The rubber band car is a car powered by a single rubber band. Energy efficiency is the amount of energy that is first stored in an object. The physic’s definition of energy efficiency is very similar. Their term is the linear distance traveled using the energy stored in one rubber band. Energy efficiency is usually found when an object’s energy transfers into a different type of energy. For us to find this‚ we have to
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materials which pose environmental problem. Polyethylene‚ polyvinyl chloride‚ polyester is largely used in the manufacture of Plastics Plastics is the general common term for a wide range of synthetic or semi synthetic organic solid materials suitable for the manufacture of industrial products .Plastics are typically polymers of high molecular weight and may contain other substances to improve performance and/or reduce costs.2. * 3. Types of Plastic Products• Plastics Bags• Plastic Coatings• Plastic
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of the plastic materials. Cassava is basically composed of starch. Cassava starch is composed of two components: amylose and amylopectin. An amylose is a long straight chain of polymer of anhydroglucose units. An amylopectin is a branched chain compound‚ also of anhydroglucose units. Because plastics are made of polymers‚ starch is a very favorable raw material in plastic-making. The study was limited to one species of cassava‚ Manihot esculenta. The plastic produced was treated with different amounts
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produced. While the polymers are accountable for the molecular exceptionally of an organism. The joint monomers are virtually universal. The difference in the form of the macromolecules are responsible for the molecular diversity. The variation that occurs both within an organism and among plants can be traced to the difference in macromolecules. Also‚ the various molecules vary from cell to cell in an identical body‚ in addition to a single species to the next. The linked together polymers are disintegrated
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References: 1. Vazqueza and D. Plackett‚ Natural polymer sources (Woodhead Publishing Ltd & CRC) Press LLC‚ 2004) Chap. 7‚ pp. 123 – 125. 2. X. Y. Liu and G. C. Dai‚ eXPRESS Polymer Lett. 1(5)‚ 299 (2007). 3. Ghosh P‚ Das D. J ApplPolymSci 1998;68:63 4. Hoareau‚ W.; Oliveira‚ F. B.; Grelier‚ S.‚ Siegmund‚ B.; Frollini‚E.; Castellan‚ A. Macromol Mater Eng 2006‚ 291
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Household items made of various kinds of plastic. Plastic is the general common term for a wide range of synthetic or semisynthetic organic amorphous solid materials used in the manufacture of industrial products. Plastics are typically polymers of high molecular mass‚ and may contain other substances to improve performance and/or reduce costs. Monomers of Plastic are either natural or synthetic organic compounds. The word is derived from the Greek πλαστικός (plastikos) meaning fit for molding‚
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their useful material properties and low production costs. Almost every product is constituted of some kind of polymer; however‚ traditional synthetic polymers (often called plastics)‚ such as polypropylene and polyethylene‚ are derived from non-renewable petrochemicals and are not readily biodegradable (http://www.plastice.org/ fileadmin/files/Brochure_teachers.pdf). The need for polymers and the products they constitute is ever increasing; however the use of non-renewable fossil fuels for plastic
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Petrochemicals industry is also a important contributor to the exchequer of the country where polymer Segment alone contributes around 8‚000 crores of Indian rupees in form of taxes and import-export duties. Slow growth in this industry will hence result into smaller government income and larger fiscal deficit which will have an adverse impact on
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