DNA is put in the in the class of compounds known as nucleic acids‚ which are polymers made out of the monomers. The monomers that make the polymers that construct DNA are called nucleotides. Two types of nucleic acids allow living organisms to copy their own complex components to their offspring through reproduction; deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). Nucleic acids exist as polymers known as polynucleotides that all are made up of nucleotides. Nucleotides have only one
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in manufacture of ammonia 9.3 Alloys 9.3.1 Physical properties of pure metals 9.3.2 Meaning and purpose of making alloys 9.4 Synthetic polymers 9.4.1 The meaning and types of polymers 9.4.2 Advantages of synthetic polymers 9.4.3 Environmental pollution caused by synthetic polymers 9.4.4 Methods to overcome the environmental pollution caused by synthetic polymers 9.5 Glass and ceramics 9.6 Composite material Conclusion References Page 3 4 5 7 10 11 12 13 14 15 16 17 17 18 18 22 24 25 INTRODUCTION
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Chapter 1 Introduction Background of the Study Starch is a linear polymer (polysaccaride) made up of repeating glucose groups linked by glucosidic linkages in the 1-4 carbon positions. The length of the starch chains will vary with plant source but in general the average length is between 500 and 2 000 glucose units. There are two major molecules in starch - amylose and amylopectin. The alpha linkage of amylose starch allows it to be flexible and digestible. Starch-based biodegradable plastics
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What is hairspray made of? Hairspray is a solution of long‚ chainlike molecules (called polymers) in a very volatile solvent. Spraying deposits a stiff layer of the polymer on your hair after the solvent evaporates. The solvent used was once a compound of carbon‚ fluorine‚ and chlorine (a chlorofluorocarbon‚ or CFC). CFCs are nontoxic‚ nonflammable‚ and make almost ideal aerosol propellants. But when it was learned that they causedestruction of stratospheric ozone‚ they were replaced with other
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|15 | |Composition‚properties and uses of alloys |16 | |(D) Synthetic polymers
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including‚ Marshall Stability‚ loss of stability tests were conducted using plastic coated aggregates and polymer modified bitumen on HMA mixtures. Work has been done by using plastic coated aggregates in cement concrete pavements. The results showed better values for asphalt concrete. This is an eco-friendly process. Key Words - waste polymer‚ Hot Mix Asphalt (HMA)‚ plastic coated aggregates‚ polymer modified bitumen‚ Marshall Stability‚ M20 plain cement concrete. 1. INTRODUCTION One of the main
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Chemistry revision Atoms elements and compounds Atom-the smallest part of an element that can still be recognized as an element Element-a substance made up of only one type of atom. An element cannot be broken down chemically into any simpler substance Nucleus-middle of the atom‚ which contains protons and neutrons Electron-tiny particle‚ which surrounds the nucleus with a negative charge Compound-when two elements react and combine together which contain more than one element. There
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SOLVENT EXTRACTION Solvent extraction‚ also known as liquid extraction and partitioning‚ is a method to separate compounds based on their relative solubility in two different immiscible liquid‚ usually water and organic solvent. It is an extraction from one liquid phase to another liquid phrase. Liquid extraction is a basic technique in chemical laboratories‚ where it is performed using a separator funnel. This type of process is commonly performed after a chemical reaction as part of the work-up
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Corporation Background The Texana Petroleum Corporation is a multi-million dollar company and major producer and marketer of petroleum products located in the southwest United States. Texana has five product divisions: Petroleum Products Division‚ Polymer and Chemicals Division‚ Molded Products Division‚ Packaging Products Division and Building Products Division. The President and Chief Executive Officer‚ Roger Holmes retired in 1993 and was replaced with Donald Irwin‚ brought in from a major chemical
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spectra of the synthesized compounds‚ HPPP‚ BOMP‚ HVPA and photocrosslinked polymers were recorded on Perkin-Elmer system 2000 (4000–400 cm–1) spectrometer‚ using KBr pellets. Medium pressure mercury vapour lamp to the power output of 125W/cm2 was used for the photocrosslinking study. The viscosity of the photocurable formulation was measured by Brookfield Viscometer RVDV–II+ (USA). The hardness of photocrosslinked polymer films was determined by A–Type JIS K6301 hardness tester (Germany). 2.6.
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