MacromoleculesQuestions: 1. Which functional groups are involved in buiding a covalent bond between these amino acids? Amine and Carboxylic acid = Amide 2. When the covalent bond is built between alanine and glycine‚ which functional group will alanine use for peptide bond? Carboxylic Acid 3. When the covalent bond is built between alanine and glycine‚ which functional group will glycine use for peptide bond? Amine 4. When the covalent bond is built between glycine and alanine‚ which functional group will alanine
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Toxic Threads: The Big Fashion Stitch-Up Toxic ThreadS How big brands are making consumers unwitting accomplices in the toxic water cycle Section X Xxxx Contents executive Summary Section 1: introduction Section 2: Methodology and results Section 3: Fast fashion: more fashion‚ more toxics Section 4: conclusions and recommendations Appendix 1 Appendix 2 Appendix 3 Endnotes 31 39 42 46 48 52 3 9 13 acknowledgements: We would like to thank the following people who contributed to the
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20 – 03 – 13 EXPERIMENT: - PREPARATION OF POLYURETHANES AIM Synthesis of polyurethanes OBJECTIVES - Mixing a diisocyanate and a diol in polyurethane synthesis of two distinct products. - Comparing polyurethane from castor oil to that made from polyethylene glycol. - To establish the type of foams in terms rigidity or flexibility. THEORY Polyurethanes‚ also known as polycarbamates‚ belong to a larger class of compounds called polymers. Polymers are macromolecules made up
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Figure 4.3: DSC Thermogram of Chitosan. The thermogram of pure Chitosan shows dehydration at 78.7 ° C and the second thermal event may be related to the decomposition of amine (GlcN) units with correspondent exothermic peak at 295° C. Reported melting point of Chitosan is 101-200 ° C .The heating rate of 10° C/min was used. Also the starting of exothermic peak at 296° C confirms the degree of deacetylation of the chitosan
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Extraction and analysis of two compounds from unknown solution C ABSTRACT Liquid C and solid C were both extracted from unknown solution by first using chemically active liquid-liquid extract‚ followed by vacuum filtration. Liquid C and solid C were then purified with the use of simple distillation and recrystallization respectively. Through the process of recrystallization‚ the percentage purity of solid C was found to be 6.01%. The melting point range of purified solid C was 117.0 – 119
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Procedure The procedure stated in Chem 2120 experiment 6 Williamson Ether Synthesis of Phenacetin laboratory manual was followed without any major changes. Data and results Compound Amount used MW (g/mol) Moles Stoichiometry/Comments acetaminophen 0.354 g 151.16 2.34 x 10-3 limiting reagent ethyl iodide 0.3mL 155.97 3.75 x 10-3 1.6 equiv ’s sodium ethoxide 2.6mL 68.05 3.3 x 10-2 catalyst‚ reaction solvent crude product obtained: phenacetin 0.32g
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API RP 571 Test 1. is a change in the microstructure of certain carbon steels and 0.5 Mo steels after long term operation in the 800º F to 1100º F range. A. Graphitization B. Softening C. Temper Embrittlement D. Creep 2. What structure is 304 stainless steel? A. Martensitic B. Austenitic C. Duplex D. Ferritic 3. is the result of cyclic stress caused by variations
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For an organisation to achieve its goals it is not enough for the employees to memorise these key principles but they also need to work towards maintaining them (Ayad & Amine‚ 2010). To ensure that this objective is achieved‚ critical thinking must be employed as it helps the employees work diligently and efficiently towards the realization of the organisation goals. The employees need to be conversant with their roles
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Characteristics and Properties of Amino Acids Introduction: Each amino acid has at least one amine and one acid functional group as the name implies. The different properties result from variations in the structures of different R groups. The R group is often referred to as the amino acid side chain. Amino acids have special common names‚ however‚ a three letter abbreviation for the name is used most of the time. A second abbreviation ‚ single letter‚ is used in long protein structures.Consult
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and release of the substance‚ its interaction with a receptor in the membrane‚ and the removal of the transmitter form the synaptic cleft. The nervous system makes use of two types of neurotransmitters: small-molecule transmitters (acetylcholine‚ amines and A.A) and neuroactive transmitters(peptides) 2. Neurons have developed a sophisticated ability to regulate the synthesis‚ storage‚ release‚ and degradation (or removal) of neurotransmitters to achieve the desired levels of transmitter molecules
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