Sunday, March 1, 2009

catalase

Hydrogen Peroxide + Catalse

Hydrogen peroxide and catalase, to see what sources of catalase contain the most enzyme activity

Video Tags:Hydrogen, peroxide, science, catalse

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Title:Hydrogen peroxide "concentration" decomposition lab  (1/2) Description:This is a reaction that I recorded during a lab. The objective was to observe the reaction rate using many different factors. In this experiment my independent variable was concentration and the dependent was time. The experiment was at room temperature (about 70F). It is the chemical decomposition of 10ml of 6% concentration Hydrogen Peroxide (H2O2) combined with .50 grams of Manganese dioxide (MnO2) catalyst. The end result of this reaction is heat, Oxygen (O2) and water vapor (H2O). Please forgive the stutter; my mind wasn't in gear at the time. Enjoy!Title:Hydrogen Peroxide Decomposition Description:Associate Lecturer Adam van Wynsberghe, UW Madison, demonstrates the role of a catalyst, manganese dioxide, in the decomposition of hydrogen peroxide into water and oxygen.Title:Chemiluminescence Description:Chemiluminescence, Yay!<br /><br />The oxidant is hydrogen peroxide  and the fuel a peroxyoxylate ester.<br />The reaction is started in the dark with the liquid oxidant (H2O2  dissolved in an organic solvent) already in the glass flask and then the  liquid fuel is added quickly from above. These reactants are mixed together  by gently swirling. The reaction's light emission reaches a maximum after  about 10 seconds. If you look carefully you can see the chemist's hand  as he manipulates the reaction vessel. Like most chemiluminescent reactions,  none of the energy released by the reaction ends up as heat: The temperature  of this reaction mixture is almost exactly the same as the temperature  of the reagents before mixing.<br /><br />Video from:<br />http://www.shsu.edu/~chm_tgc/chemilumdir/movie.htmlTitle:My Biology Assignment Description:Reacting hyroden peroxide with catalse.<br /><br />The reaction with catalase (liver) and hydrogen peroxide creates oxygen which has been captured by displacement of water (blue dye added.<br /><br />Originally the reaction vessel was supposed to be a test tube but I accidently broke it while getting the stopper in... The measuring cyliner was then used, however this trial (my only video trail) leaked a bit on the side.Title:Hydrogen peroxide 85% decomposing Description:Decomposition of HTP using silver in a brass screen as catalyst
Yahoo news related to catalase

Why Hair Goes Gray (CBS News)
Scientists may have figured out why hair turns gray, and their finding may open the door to new anti-graying strategies.

Why Hair Goes Gray (MedicineNet.com)
Title: Why Hair Goes Gray Category: Health News Created: 2/26/2009 Last Editorial Review: 2/26/2009

Lack of enzymes turns hair gray (UPI)
BRADFORD, England, Feb. 23 (UPI) -- A team of European researchers says hair grays with age as follicles become bleached first gray, and then white, from within.

Google news related to catalase

Why Hair Goes Gray - CBS News  The process starts when there is a dip in levels of an enzyme called catalase. That catalase shortfall means that the hydrogen peroxide that naturally occurs in hair can't be broken down. So hydrogen peroxide builds up in the hair, and because other ...

Grey hair resolved – our hair progressively bleaches itself with age - National Business Review  The researchers discovered that the hydrogen peroxide build-up was caused from the reduction of an enzyme (catalase) that breaks apart hydrogen peroxide into water and oxygen. Hair follicles cannot repair the hydrogen peroxide damage, which is also ...

Apply anti-graying strategy carefully - Little About  It has also been found that the process initiates when there is a decline in levels of an enzyme called catalase. Keep in mind that deficit in catalase indicates hydrogen peroxide, which occurs in the hair in a normal manner, can’t be made ineffective. ...

Flickr pictures related to catalase

  1. he stopped it on the 00
  2. measurements
  3. reaction
  4. beakers
  5. beakers
  6. pouring
  7. measuring out the milk powder
  8. H202
  9. lab bench
  10. pouring

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