or misidentified as the palmetto bug is the largest species of common cockroach‚ and often considered as pest. Breed- to produce offspring by hatching or gestation. Chitin- is a long chain polymer of N-acetylglucosamine‚ a derivative of glucose‚ and is found in many places throughout the natural world. Laboratory- is a facility that provides controlled conditions in which scientific research‚ experiments‚ and measurement may be performed. The title of laboratory is also used for certain
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Spandex fibers were first produced by Farbenfabriken Bayer. He was a pioneer in polymer chemistry and in 1952 earned a German patent for his synthesis. The final development of spandex was produced by scientists at Du Pont and the U.S. rubber Company. Du Pont used the brand name Lycra. They soon began manufacturing in 1962. Du Pont is the world’s leader in spandex production. Spandex development first started in during World War II as a substitute for rubber. Since rubber was being used for the
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FOR THE ENVIRINMENT? A plastic material is any of a wide range of synthetic or semi-synthetic organic solids that are moldable. Plastics are typically organic polymers of high molecular mass‚ but they often contain other substances. They are usually synthetic‚ most commonly derived from petrochemicals‚ but many are partially natural. Whether you are aware of it or not‚ plastics play an important part in your life. Plastics’ versatility allow it to be used in everything from car parts to doll
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Science Ltd. All rights on the tissue engineering of bone and cartilage from the polymeric sca!old point of view. reserved. Keywords: Tissue engineering of bone and cartilage; Design and fabrication of 3-D sca!old; Biodegradable and bioresorbable polymers 1. Introduction Bone and cartilage generation by autogenous cell/tissue transplantation is one of the most promising techniques in orthopedic surgery and biomedical engineering [1]. Treatment concepts based on those techniques would eliminate
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properties‚ but very different chemical properties. 2002:17 3 4 Which polymer is made by the polymerisation of methyl methacrylate? CH3 H2C= C—COOCH3 methyl methacrylate 2003:11 1 5 The flowchart shows the production of polyethylene. (b) Describe Process Y. 2003:17(b) 3 6 A sample of polyethylene was produced by Process Y. The following graph shows the distribution of molecular weights of polymer molecules in the sample. (c) Why is a range of molecular weights observed
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Research on Biopolymers Biopolymers are polymers that those that are made from living things and can be broken down by micro-organisms when released into the environment. Polyhydroxybutyrate (PHB) is a polyhydroxyalkanoate produced by a microorganism called Alcaligenes Eutrophs. The bacterial culture is given abundant nutrient for rapid replication. Nutrient supply is then drastically reduced and the bacteria converts the available food into energy storage. This is produced in the form of PHB. PHB
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1. Label the three types of polygenic trait selection illustrated below 2. What type of individuals in the population are represented by the 2 ends of the bell curve? 3. Starlings produce an average of five eggs in each clutch. If there are more than five‚ the parents cannot adequately feed the young. If there are fewer than five‚ predators may destroy the entire clutch. This is an example of a. disruptive selection. b. stabilizing selection. c. directional selection. d. none
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中国组织工程研究与临床康复 第 12 卷 第 19 期 2008–05–06 出版 Journal of Clinical Rehabilitative Tissue Engineering Research May 6‚ 2008 Vol.12‚ No.19 Review Application and research progress of starch in polymer materials★ Wang Zhi-fen‚ Fang Lin‚ Zhang Ke-xi‚ Fu Xin Abstract: Starch a natural polymer that is characterized by cheap‚ regenerative‚ and good biodegradation is generally mixed with low density polyethylene‚ high density polyethylene‚ polypropylene‚ and polystryrene to prepare degradable materials
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evidently proves the addition of polybutadiene increases the impact strength of HIPS. During polymerisation‚ the addition of polybutadiene prevents the polymer chains from aligning. This means that there will a reduction of crystalline structures that can be formed. This results in a larger amorphous area‚ giving it the properties of an amorphous polymer. Since it
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loading and the extent of clay dispersion in the polymer matrix. Transition from liquid-like behavior to solid-like behavior shifts to significantly higher solids loading at higher shear rates which may be due to the alignment of the particles in the direction of flow at high shear rates. SEM micrographs are used to display the extent of intercalation and dispersion of the clay within the polymer matrix. INTRODUCTION AND BACKGROUND 1.1 Definition Polymer/clay nanocomposites display a change in composition
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