also suffer from other allergic diseases such as asthma‚ hay fever‚ urticaria or rhinitis. Contact eczema/dermatitis is also common and is often caused by sensitivity to nickel in jewellery or studs in clothing. Other trigger substances include irritant chemicals such as oils from exposure at the workplace: - for example shampoo in hairdressers‚ cement (containing chromium) in builders. In atopic patients the rash usually starts on the face‚ particularly over the cheeks and chin. Other patients
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Signs and symptoms of Conjunctivitis‚ Swelling of conjunctiva and watering of the eyes are symptoms common to all forms of conjunctivitis. However‚ the pupils should be normally reactive‚ and the visual acuity normal. Viral Viral conjunctivitis is often associated with an infection of the upper respiratory tract‚ a common cold‚ and/or a sore throat. Its symptoms include excessive watering and itching. The infection usually begins with one eye‚ but may spread easily to the other. Viral conjunctivitis
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principal strains. automated grey-field polariscope has been devised that painlessly collects both magnitude and direction data without user intervention. Although the new polariscope is capable of making multiple fringe measurements‚ it has its greatest impact in sub-fringe applications where the output parallels the description of the stress state of an object given by Mohr’s circle. Grey-field Polariscope Introduction Photoelastic stress analysis has long been a faithful and productive
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Experiment 3: ANALYSIS OF UNKNOWN ACID SAMPLE USING TITRATION METHOD Date of Experiment: 4 September 2012 Introduction An acid-base titration is a procedure used in quantitative chemical analysis to determine the concentration of either an acid or a base. Titration is the slow addition of an acid (or a base) of known concentration from a burette (a narrow graduated cylinder) to a base (or an acid) of unknown concentration fin an Erlenmeyer
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Cigarette smoke is the leading cause of emphysema. When inhaling tobacco smoke‚ it temporarily paralyzes the microscopic hairs that line bronchial air ways. These hairs sweep irritants and germs out of a person’s airways‚ but when smoke interferes with this sweeping movement‚ from the paralysis‚ irritants remain in a person’s bronchial tubes Emphysema is a progressive disease of the lungs that can cause shortness of breath. The physical shapes of the lungs are destroyed in
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for absorption rates when denatured and annealed. Reagent Table: Reagent Molecular Weight (g/mole) Boiling Point (°C) MeltingPoint (°C) Density Hazards NaCl 58.44 1413 801 2.165 g/ml Skin and eye irritant Inhalation Ethanol 46.07 78.5 -114.1 1.59 g/ml Skin and eye irritant Introduction: Chromatin is a complex of DNA and proteins (histones) that make up the contents of the nucleus of a cell. It has 4 main functions: to package DNA into a smaller volume to fit in the cell‚ to
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Bunsen burner Subtance List: Sodium carbonate solution Copper sulphate solution (Safety: High toxicity) Sodium hydroxide solution (Safety: Irritant) Ammonia solution (Safety: Toxic by inhalation) Potassium iodide solution (Safety: Mild irritant) Lead nitrate solution (Safety: Toxic) Sulphuric acid (Safety: Corrosive) Copper carbonate Silver Nitrate
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pattern of maxima and minima on the third screen. 2. Theory of Interference Fringes (Analytical Treatment of Interference) Let S be a monochromatic source of light. S1 and S2 be double slits equidistance from S. Let the distance between S1 and S2 be ‘d’ and ‘D’ be the distance of the screen (AB) from S1 S2 . Let us consider a point P at a distance ‘x’ from the center ‘O’ (Fig.). 2 Condition for bright fringe: The point P is bright when the path difference is a whole number of multiple
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the utilization of the single slit-diffraction phenomena in analyzing the physical characteristics of a hair strand. Hair samples with various macroscopic textures were used as barriers to produce a diffraction pattern where the distance between fringes were readily obtained using a program that displays its line profile. The eccentricity values‚ [pic]‚ are (0.12±0.01)‚ (0.29±0.04)‚ (0.33±0.01)‚ (0.35±0.03) for Sample 1 to 4 respectively. Almost all of the samples exhibit eccentricities of less than
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of the thought shapers‚ announces to the others that she is engaged to Alan‚ a boy who got David’s friend Sophie sent to the Fringes for having six toes‚ all of the other thought shapers‚ including her sister Rachel‚ are against the idea and tell her not to go through with it because if Alan were to find out they would all be caught and either killed or sent to the Fringes. When Uncle Axel hears about the engagement‚ he tells David they need to kill Alan to protect themselves from getting caught
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