Language Learning & Technology http://llt.msu.edu/vol14num1/winkegasssydorenko.pdf February 2010‚ Volume 14‚ Number 1 pp. 65–86 THE EFFECTS OF CAPTIONING VIDEOS USED FOR FOREIGN LANGUAGE LISTENING ACTIVITIES1 Paula Winke‚ Susan Gass‚ and Tetyana Sydorenko Michigan State University This study investigated the effects of captioning during video-based listening activities. Second- and fourth-year learners of Arabic‚ Chinese‚ Spanish‚ and Russian watched three short videos with and without captioning
Premium Language acquisition Second language acquisition Linguistics
Antioxidant Effects on Reactive Oxygen Species Abstract Antioxidants are among key molecules for a healthy living. Antioxidants are molecules that prevent damage of cells through inhibition of oxidizing agents such as free radicals. This experiment was aimed at investigating the role of antioxidant on the inhibition of reactive oxygen species. To demonstrate this‚ quercetin was used as antioxidant and its effect on reactive oxygen species examined. RAW 264.7
Premium Oxygen Antioxidant Hydrogen peroxide
that is often described as “biting” and as “hanging” in the nasal passages. Ethanol has a slightly sweeter (or more fruit-like) odor than the other alcohols. In general‚ the hydroxyl group makes the alcohol molecule polar. Those groups can form hydrogen bonds to one another and to other compounds (except in certain large molecules where the
Premium Alcohol
IB Biology Sheran Gu Meghan Lena Nov. 15th Influence of pH on Enzyme Activities How does the pH of solution influence the speed of enzyme activities? Enzymes are protein catalysts and chemical that speed up chemical reaction without being involved in the reaction. They are involved in the human digestive system to help people digest food more efficient. Food are substrates to be break down and absorb through the digestive system in the body. Substrate is a molecule that bond with the active site
Premium Enzyme Chemical reaction Metabolism
EFFECT OF CONCENTRATION ON REACTION RATE The aim of this experiment is to find the effect of varying the concentration of iodide ions on the rate of reaction between hydrogen peroxide and an acidified solution of potassium iodide: H2O2(aq) + 2H+(aq) + 2I⁻ → 2H2O(l) + I2(aq) The course of this reaction can be followed by carrying it out in the presence of small quantities of starch and sodium thiosulfate solutions. As the iodine molecules are produced they immediately react with the thiosulfate
Premium Reaction rate Chemical reaction Sodium
Lab Report (Effect of concentration on enzyme activity) Biology Noor Alawadhi 11- KC Introduction: An Enzyme is a protein‚ which is capable of starting a chemical reaction‚ which involves the formation or breakage of chemical bonds. A substrate is the surface or material on or from which an organism lives‚ grows‚ or obtains its nourishment. In this case it is hydrogen peroxide. This lab report will be explaining the experiment held to understand the effects of the changes in the amount of
Premium Chemical reaction Oxygen Enzyme
Lab Report Effect of temperature on enzyme activity I. Purpose: Determine how effect of temperature on enzyme (catalyse) activity (in the liver). II. Materials * Raw liver * Forceps * 50mL 1% hydrogen Peroxide (H * 25mL graduated cylinder * 50mL‚ 400mL beakers * Pureed liver * 5 Filter-paper disks * Paper towels * Timer or stopwatch * Thermometer * Hot plate III. Procedure 1.Gather all necessary materials; start
Premium Temperature Celsius Enzyme
promotes the conversion of hydrogen peroxide‚ a powerful and potentially harmful oxidizing agent‚ to water and oxygen. Catalase also uses hydrogen peroxide to oxidize toxins including phenols‚ formic acid‚ formaldehyde and alcohols. Catalase is an example of a particularly efficient enzyme. Catalase has one of the highest turnover numbers for all known enzymes (40‚000‚000 molecules/s). This high rate shows an importance for the enzymes capability for detoxifying hydrogen peroxide and preventing the
Premium Oxygen Enzyme Hydrogen peroxide
The Effect of Common Bactericidal Agents on Staphylococcus Epidermidis Introduction Staphylococcus epidermidis is a facultative anaerobic bacterium. It is part of the normal human flora and is found on the skin. Colonies of these bacteria can produce a protective slime called a hydrophobic biofilm. Staphylococcus epidermidis is usually not pathogenic unless it enters the human body. One of the most common places for infections are hospitals where people often have weakened immune systems‚ open
Premium Bacteria Chlorine Oxygen
Effects of Changes in Physical Properties on Enzyme Activity By Alex Hoffmann First Individual Lab Report Wednesday 7:30-10:15pm 10/24/12 Meghan Duell Abstract The goal of this lab was to determine the effects of certain physical properties on enzyme activity. Enzyme activity was measured by the height of the bubbles that appeared after the enzyme was added which are proportional to the rate of the reaction when time is constant. The fact that enzyme activity is affected by physical
Premium PH Enzyme