likely to suffer from severe acne. That is because the increase in growth hormone which causes the sebaceous glands in the skin become clogged. 3. Iodine Iodine may be one factor in the appearance of acne‚ such as skin oil glands which can irritate skin that is prone to acne. Iodine can be found in fish and shellfish because sea water contains iodine. In addition other sources comes from iodized salt which is a component of several types of canned food. 4.Caffeine and Alcohol Caffeine is considered
Premium Immune system Allergy
peroxydisulfate ions (S2O82-) react with iodide ions (I-) in the presence of a starch indicator‚ they produce a dark blue solution. Reaction (1) S2O82- + 3I- I3- + 2 SO42- (peroxydisulfate ion) (iodide ion) (iodine ion) (sulfate ion) To determine the rate law for this reaction a series of changes in the concentration of peroxydisulfate‚ [S2O82-]‚ and a series of changes in the catalyst while mean the corresponding changes in time‚ t‚ needs to be observed
Premium Chemistry Chemical reaction Hydrogen
Differentiate between a differential stain and a special stain (how are they different‚ don’t simply identify the types of differential stains and special stains). What is the role of the Gram’s iodine in a Gram stain? What color would all bacteria become at the end of the staining procedure if the iodine in the gram step was omitted? What is the role of the alcohol wash in the Gram Stain? What color would all bacteria become at the end of the staining procedure if the alcohol step in the gram
Premium Staining Gram staining
Heironimus‚ White 3 There are four main macromolecules; proteins‚ nucleic acids‚ lipids‚ and carbohydrates. The presence of some of these‚ such as sugar‚ fat‚ starch‚ and protein‚ can be determined using tests such as Benedict’s solution‚ Lugol’s iodine solution‚ Biuret’s reagent‚ and Sudan III. Control tests were performed to determine what a positive result would appear like. Then the tests were performed using substances containing sprite‚ fries‚ hamburgers‚ and chicken nuggets. Results matching
Premium Glucose Carbohydrate Polysaccharide
water‚ ev milk‚ 50% egg solution‚ 1% sucrose‚ 4 test tubes‚ 1 test tube rate‚ safety glasses‚ pipets and the reagent solution. For test 2 for starches the following materials were used: Di water‚ 1% starch solution‚ onion juice‚ sucrose solution‚ iodine reagent‚ 4 test tubes‚ test tube rack and pipets. In test 1 and test 2 each solution was placed in a separate test tube with the corresponding reagent added to each as well. In test one for proteins each substance that showed a purple color it indicated
Premium Glucose Purple Carbohydrate
Thermochromism Thermochromism refers to the phenomenon of color changes by the agency of heat. Obviously‚ the color changes are made possible by the temperature-induced chemical or physical changes of materials incorporated into the inks. Sometimes‚ the color change occurring at a temperature is permanent‚ and at other times the original color can be regained on cooling. Accordingly‚ we have an irreversible or reversible thermochromic system. The required chemistry can be adopted based
Premium Energy Heat Temperature
inhibitory (antimicrobial) activity against the organism. This experiment deal with the evaluation of antimicrobial activity of two antiseptics which are 5 % iodine and 5% formaldehyde‚ against two organism Pseudomonas fluorescens (gram-negative) and Serratia marcescens (gram-negative). MATERIALS Chemical agent to be tested (5 % iodine and 5 % formaldehyde) Cultures of Pseudomonas fluorescens and Serratia marcescens. Sterile petri dishes Liquid nutrient agar Sterile filter paper disc
Premium Antiseptic Bacteria Microbiology
volumetric flask - graduated cylinder -beakers V.Experimental procedure: Reference experiment number 7‚lab manual phar 205‚2012 p.65 . VI.Theory: Rather than titrating directly with iodine‚an excess of iodine will be generated directly in the solution with ascorbic acid according to the following equation: IO3- + 5I- +6H+ → 3I2 + 3H2O Vitamin C is readily oxidized with I2 in acidic medium.
Premium Titration Ascorbic acid Vitamin C
amylopectin. To test for the presence of starch‚ the Starch Test is used. This is a simple test in which iodine is added to a given solution. If a polysaccharide such as starch is present then the iodine ion will lodge itself in the polysaccharide chain and give it a black-blue color. If iodine added to a solution turns black-blue than starch is present. If the solution remains the color of iodine‚ reddish-orange‚ there is no starch present‚ a negative test. In our experiment we scale the color we see
Premium Starch
Materials : Glucose‚ sucrose ‚ fructose ‚ hydrochloric acid ‚ potassium hydroxide ‚ albumin ‚ cooked starch ‚ corn oil ‚ copper (ll) sulphate solution ‚ ascorbic acid solution ‚ DCPIP solution ‚ Millon’s reagent ‚ Sudan lll ‚ tap water‚ ethanol ‚ iodine solution ‚ Benedict’s solution. Observation : Part One : Identification of Carbohydrates Reducing sugar Test Observation Fructose Colourless fructose solution turned to reddish brown solution. Glutose Colourless glucose solution turned
Premium Glucose Sucrose Fructose