blocks of thyroid hormones. Iodine is then needed for formation of the hormones by its absorption from the diet and then carried via bloodstream to the thyroid gland which is then secreted into the colloid and oxidised into iodine ions. The attachment of iodine ions to tyrosine molecules triggers the pairing process performed by the thyroid peroxidise. This leads to production of thyroxine hormone T4 (containing four iodine ions) and triiodothyronine T3 (containing three iodine ions). (Martini 2004)
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Iodine clock reaction This is the hydrogen peroxide/ potassium iodide ‘clock’ reaction. A solution of hydrogen peroxide is mixed with one containing potassium iodide‚ starch and sodium thiosulfate. After a few seconds the colourless mixture suddenly turns dark blue. This is one of a number of reactions loosely called the iodine clock. It can be used as an introduction to experiments on rates / kinetics. 63 Lesson organisation This demonstration can be used at secondary level as an introduction
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Major health problems in india : Major health problems in india communicable disease problem population problem environmental sanitation problem medical care problem nutritional problem COMMUNITY NUTRITION PROGRAMMES: INTEGRATED CHILD DEVELOPMENT SERVICE (ICDS) SCHEME : Integrated Child Development Service (ICDS) scheme was launched on 2nd October‚ 1975 (5th Five year Plan) in pursuance of the National Policy For Children started in 33 experimental blocks Success of the scheme led to its
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Giancarlo Vidal CHM 1033 10/16/14 “Role of the Trace Elements - Iron‚ Zinc‚ Chromium‚ Copper‚ Iodine‚ and Selenium in the human body” Trace elements are necessary by the body for normal growth‚ development and physiology. Even though many of the elements are required in only very small quantities‚ they do play a very significant role in keeping the body functioning efficiently. A surplus or shortage of the trace elements in our bodies can equally threaten human health. Iron is an integral part of
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iodometry- the winkler’s method. Apparatus: volumetric pipette‚ 3 conical flask‚ burette‚ burette clamp‚ Pasteur pipette‚ reagent bottle‚ conical flask stopper‚ retord stand‚ white tile Materials: 2 ml manganese sulphate solution‚ 2 ml alkaline-iodine solution‚ 0.025M sodium thiosulphate solution‚ 2ml concentration sulphuric acid‚ starch solution Procedure 1. When sampling water‚ care must be taken to ensure that a good representative sample of the water to be analyzed is obtained. For most
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G-250 * Bradford Reagent * Bovine Serum Albumin = BSA * Reagent blank = test tube #1 = 0mL BSA stock solution‚ 1mL distilled H2O * 595nm * Plot A595 vs concentration of BSA Experiment 4: Enzymatic Activity of Salivary Amylase * Iodine test – presence of starch * 1/t vs temperature/pH Experiment 5: General and Specific Tests for Carbohydrates | Reagents | Principle | Test for | Positive Result | Negative Result | Molisch | Molisch Reagent ‚Conc. H2SO4 | hydrolysis‚ dehydration
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fructose‚ maltose‚ sucrose‚ lactose‚ |Molisch reagent | |agar-agar‚ gum arabic‚glycogen‚ cotton‚ |I2 in KI solution (Lugol’s iodine reagent) | |starch |Benedict’s reagent | |10% HOAc solution‚
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these factors are absent‚ photosynthesis cannot occur. Materials required Materials list Geranium‚ begonia‚ or impatiens plants (entirely green leaves)‚ coleus with variegated leaves (green and white colored)‚ hot plates and hot-water bath‚ Lugol’s iodine solution in dropper bottles‚ 250-mL beakers‚ 100-mL beakers‚ tongs‚ foreceps‚ Petri dishes‚ glass-marking pencil‚ 70% alcohol Method PART I - Effects Of Light And Dark
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Many advanced high school and college chemistry students perform an experiment known as the "iodine-clock" reaction‚ in which hydrogen peroxide reacts with iodide to form iodine‚ and the iodine subsequently reacts with thiosulfate ion until the thiosulfate has been consumed. At that point‚ the reaction solutions turn blue in the presence of starch. The experiment helps students understand the fundamentals of chemical kinetics --- the speeds at which reactions take place. 1. Activation Energy
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October 2014 Periodicity of the Halogens Goal: To design and carry out an experiment that will give enough data to rank the three halogens from highest to lowest electron affinity. Background: The three aqueous solutions given in this experiment are Iodine‚ Bromine‚ and Chlorine; they are all non-polar and dissolve easily in Hexane which is also non-polar. When there is a color change in a mixture that means that it reacted and that there was a double displacement reaction when there is no change then
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