negative result because biuret reagent is blue to begin with. If a solution is pinkish purple‚ or purple‚ then the test for protein is positive. The test solution for starches is yellowish brown. If any substance that is yellowish brown when mixed with iodine‚ then the test for starches is negative. If the solution turns purple‚ or a dark purplish black‚ then the test for starches is positive. If DI water‚ and sucrose are tested for proteins using biuret reagent‚ then they will show a negative result
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used are ethanol (60–90%)‚ 1-propanol (60–70%) and 2-propanol/isopropanol (70–80%) or mixtures of these alcohols. They are commonly referred to as "surgical alcohol". Used to disinfect the skin before injections are given‚ often along with iodine (tincture of iodine) or some cationic surfactants (benzalkonium chloride 0.05–0.5%‚ chlorhexidine 0.2–4.0% or octenidine dihydrochloride 0.1–2.0%). Quaternary ammonium compounds Also known as Quats or QAC’s‚ include the chemicals benzalkonium chloride (BAC)
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due to iodine deficiency and cases are more common in developing countries due to the lack of iodine in diets. Iodine is extremely important in thyroid function because it is used in thyroid hormone production. Goiters are more closely associated with Hashimoto’s disease since TSH stimulation causes the thyroid to grow. In some cases‚ goiters can be associated with hyperthyroidism‚ such as Grave’s Disease depending on thyroid hormone levels (American Thyroid Association). Aside from iodine deficiency
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Experiment 9 Empirical Formula of Zinc Iodide Objectives Upon completion of this experiment‚ students should have learned: 1. The law of conservation of mass. 2. How to calculate an empirical formula. 3. The concept of limiting reagents. Introduction Synthesis and the determination of empirical formulas are two extremely important parts of chemistry. In this experiment‚ you will synthesize zinc iodide and determine its empirical formula. The molecular formula gives the actual
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The fluid mosaic model of the cell membrane. What is the fluid mosaic model? The fluid mosaic model is a model conceived by S.J. Singer and Garth Nicolson in 1972 to describe the structural features of biological membranes. The membrane is described to be fluid because of its hydrophobic integral components such as lipids and membrane proteins that move laterally or sideways throughout the membrane. That means the membrane is not solid‚ but more like a ’fluid’. The membrane is depicted as mosaic
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conducting the Benedict and Iodine test. Theory The theory for this concept is that if in the benedicts test the carbohydrate reacts‚ it is a monosaccharide. If it reacts in the Iodine test it is a polysaccharide. If no reaction occurs in either test the carbohydrate is a disaccharide. Data Type of carbohydrate | Benedicts Test | Iodine Test | Monosaccharide | R | NR | Disaccharide | NR | NR | Polysaccharide | NR | R | Solution | Bendicts Test | Iodine Test | Honey | R | NR | Oats
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Experiment We tested the permeability of the dialysis tubing to glucose‚ starch‚ and iodine. Initially‚ glucose and starch were placed into the bag‚ and iodine outside of the bag in the beaker. We used the iodine test for the presence of starch which proved positive inside of the bag‚ and Benedict’s reagent for glucose which was positive outside of the bag. We therefore concluded that only small molecules like glucose and iodine can permeate through the bag‚ starch is too large. Introduction This lab
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population particularly in developing countries. This in effect contributes substantially to the global burden of diseases. It has been estimated that micronutrient deficiencies account for 7.3% of the global burden of disease‚ with iron‚ vitamin A and iodine deficiency ranking among the 15 leading causes of global disease burden. Fortification of food is considered to be one of the most cost-effective methods to addressing these widespread deficiencies. As defined by the Food and Agricultural Organisation
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whereas amylopectin is completely insoluble. The structure of amylose consists of long polymer chains of glucose units connected by an alpha acetal linkage. Amylose in starch is responsible for the formation of a deep blue colour in the presence of iodine (Frances and Ellie‚ 2008). Starch granules are more or less regular spheres which composed of a mass of radiating needle-shaped crystals when the granules are viewed under polarized light (Srilakshmi‚ 2003). Starch granules do not dissolve easily
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materials used are usually sensitive to radiation [1]. For instance‚ iodine-131 has a half life of 8 days which is long enough for it to concentrate in the thyroid gland‚ allowing doctors long enough to monitor its function‚ but not so long as to cause damage. Iodine-131 is one of the most widely used isotopes. It is supplied in capsules or liquid of a specific activity designed to be swallowed by patients. Iodine is a naturally occurring element known as Iodide. It has many uses in
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