29 September 2010. Karp‚ G. E. (2008). Cell and Molecular Biology. 5th Ed. John Wiley & Sons‚ Inc. New Jersey. pp. 40-50; 74-75. Lea‚ C. (2002) “Biological Macromolecules” University of New Mexico. 29 September 2010. Ophardt. C.E. (2003) “Starch-Iodine” Elmhurst College. 29 September 2010.
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oxidized by iodine in acidic solution according to the following equation Ascorbic acid The standard method for determination of ascorbic acid involves the direct titration of acidified sample with a standard iodine solution. But the low solubility of iodine makes this procedure less than ideal. The proposed experiment avoids these difficulties is by using the reaction between iodide (in excess) and iodate which generate a known excess quantity of iodine‚ and this excess iodine is back
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and the solvent. b. Classify the solute and the solvent as polar‚ nonpolar or ionic. c. Identify the solute-solute‚ solvent-solvent and solute-solvent attractive forces. Lewis Structures Solutes: NaCl Naphthalene Glycerol Potassium Iodide Iodine Crystal Solvents: Distilled water Ethyl Alcohol Toluene Solutions Polar‚ Non-Polar or Ionic Attractive Forces NaCl + Distilled Water Solute NaCl Solute-solute Solute-solvent Solvent Distilled water Solvent-solvent NaCl + Ethyl
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by taste tests‚ many cannot. Scientists then use certain tests to determine the presence of macromolecules. To determine the type of macaromolecules present in a certain type of food sample‚various test can be done .The tests performed were‚ iodine testing for starch and glycogen‚ Benedict’s test for reducing sugars‚schultz’ solution for cellulose‚ Phloroglucinol to test for lignin ‚Xantoproitec test and Biuret’s test for protein.And for lipid ‚ Sudan 3 test and emulsion test was conducted
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Determination of the presence of carbohydrates and protein in aqueous solution samples Objectives To determine the presence of starch‚ glycogen‚ reducing sugar‚ peptide‚ and proteins by utilizing Iodine test‚ Benedict test‚ and Biuret test. Introduction The purpose of this experiment was to identify the presence of macromolecules by using various positive and negative controls. The principle building blocks of living organisms are essentially constructed by carbon-containing
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chemical methods such as iodine fuming‚ silver nitrate‚ or ninhydrin to locate latent prints on porous materials. When one of these chemicals comes into contact with the chemicals present in the fingerprint residue the print become visible. .Iodine fuming takes place in a fuming chamber. The process works by heating up solid crystal iodine which creates vapors that adhere to the oily residue of print‚ producing a brown colored print. One of the drawbacks of using iodine fuming is that the print
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tested was what environment affects the mass of the potatoes the most. The independent variable is the environments used salt‚ water and iodine solution. The dependent variable is the mass of the potato after being exposed to the environment for 5 days. The control was a potato in no specific environment‚ meaning it is just sitting in air‚ no salt and no water/iodine solution. If the potato is exposed to a specific (hypotonic/hypertonic) environment then the mass will increase/decrease because the
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redox titrations was essential. Acid-base titrations can also be used however they are not able to complete all of the reactions in the solution and do not interfere with the oxidation of ascorbic acid by iodine solution. Iodine is relatively insoluble‚ but this can be improved by complexing the iodine with iodide to form triiodide as the following formula suggests: I_(2(aq))+〖I^-〗_((aq))↔〖I^-〗_(3(aq)) This triiodide ion can be used to oxidize vitamin C to form dehydroascorbic acid. In this reaction
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The Identification of Bacillus Badius [pic] Hannah Melanchuk Dr. Robert Suran May 1 2013 Microbiology Abstract Over a three week time span I was able to successfully identify an unknown microorganism by combining the results of several tests. The first test was the Gram stain test which showed the microorganism was Gram positive and rod shaped. Using an Unknown Identification Flowchart‚ I proceeded to inoculate a Starch plate. In week 2‚ I
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dialysis bag as a model of the cell membrane. Our hypothesis was that the glucose will diffuse out of the membrane into the beaker filled with iodine solution. To demonstrate dialysis tubing we used water‚ starch and iodine. When starch and iodine react together they form a dark brown color. Materials Rubber band Dialysis bag Beaker Glucose solution Iodine solution Water‚ thread Methods Cut a piece of dialysis tubing that has been soaking in water approximately 40 cm (approx. 16 in) long
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