Background NMR spectroscopy is a well established method for structure determination of various organic molecules ranging from small molecules all the way up to large bio-molecules such as proteins‚ DNA and polysaccharides. The chemical environment surrounding each atom as well their proximity to other atoms in a molecule can be studied with various experiments‚ enabling high-resolution 3D-structure determinations as well as verification of the chemical structure. NMR spectroscopy is well suited
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Module 2 Mass Spectroscopy [pic] [pic] Diagram of a mass spectrometer Stage 1: Ionisation The sample is injected as a vapour and the atoms are bombarded by fast moving electrons. This causes the molecule to fragment into two or more pieces. When a molecule or part thereof fragments‚ one portion would be positively charged while the second portion will be uncharged. All uncharged fragments are ultimately lost in the machine as mass spectrometers only work with positive ions. Stage 2: Acceleration
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Introduction In order to determine the content of calcium and magnesium in an unknown sample of limestone‚ the utilization of atomic absorption spectrophotometry can help in deciphering the unknown concentrations of each molecule in the limestone sample. Atomic absorption spectrophotometry‚ emits radiation of the correct frequency that is passed through a flame and the intensity of the transmitted radiation is measured¹.The calcium concentration or ppm can be measured using the absorbance of the
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Science University‚ Tehran‚ Iran b c a r t i c l e in f o Article history: Received 21 April 2010 Received in revised form 14 August 2010 Accepted 18 August 2010 Available online 26 August 2010 Keywords: HSA Lomefloxacin Colchicine Spectroscopy Molecular dynamic a b s t r a c t Combination of several drugs is often necessary especially during long-term therapy. The competitive binding drugs can cause a decrease in the amount of drug bound to protein and increase the biological active fraction of
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Absorption Costing Absorption costing is a method of costing that assigns a small percentage of production and overheads costs to the price of each product that is going to be sold. It accounts for all costs‚ direct and indirect‚ fixed and variable. For example; if 1000 products are made and the total costs are £10000 then each product would cost £10 before making a profit (10000/1000=10). Variable costs are costs that can be controlled by management or a sales worker. Whereas fixed costs are
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Spectrophotometry. Spectroscopy‚ and the Spectrometer Spectroscopy is the branch of science concerned with the investigation and measurement spectra produced when mater interacts with or emits electromagnetic radiation Meanwhile‚ spectrophotometry is the measurement of color in a solution by determining the amount of light absorbed in the ultraviolet‚ infrared‚ or visible spectrum. A spectrophotometer is an instrument often used to compare the intensity of light from a regulated or standard
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Measuring the Absorption Coefficient for Some Common Materials Used in Functional Rooms through Standing Wave Ratio Adonis Cabigon1‚ Alaiza Tangaha2 Department of Physics‚ University of San Carlos‚ Nasipit‚ Talamban‚ Cebu City 6000 1adoniscc@yahoo.com 2mayalaiza92@yahoo.com Abstract In this paper‚ we present the measurement of the absorption coefficient α of MDF (Medium Density Fiberboard) and Fiber Cement through an improvised standing wave apparatus consist of an enclosed tube with
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The 1930’s Food! The 1930’s cuisine was very simple and extremely rationed. The people in the 30’s just didn’t have the money to afford for themselves and kids all the time. The food was mostly given to men and children in soup/ bread lines for those who couldn’t afford food. The food was simple and inexpensive; the goal was to produce a lot of food with as little ingredients as possible. I’m sure the bread was bland and the chowders and soups were plain but it’s what the people of this struggling
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the structure of slime and circle the cross-links. Cross-links refer to the bonds formed when polymer chains are joined together. Figure 1: Borax forming slime (Source: www.gcsescience.com) 4. Name a biopolymer and identify its monomer unit(s). Cellulose is a biopolymer formed from joining monomers of glucose. Introduction Polymers basically are macromolecular substances that are joined by large quantities of small similar looking units called monomers. This process is called polymerization
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flask. 2. The solution was transfer to a beaker and labelled as unknown solution. C. Determination of absorption maximum 1. Distilled water was used as blank for determination of absorption maximum. 2. The blank solution was put at the end of the tips contain quartz to calculate the absorption maximum. 3. The result of absorption maximum from the graph was printed. 4. Absorption maximum will be used to determine the unknown concentration. D. Operation of the UV-VIS spectrophotometer
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