Units of Catalytic Activity
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Home > Art, Film & Photography > Units of Catalytic Activity: Katal, Turnover Number, Lintner, Enzyme Unit
Units of Catalytic Activity: Katal, Turnover Number, Lintner, Enzyme Unit

Units of Catalytic Activity: Katal, Turnover Number, Lintner, Enzyme Unit


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About the Book

Chapters: Katal, Turnover Number, lintner, Enzyme Unit. Source: Wikipedia. Pages: 18. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: Turnover number has two related meanings: In enzymology, turnover number (also termed kcat) is defined as the maximum number of molecules of substrate that an enzyme can convert to product per catalytic site per unit of time and can be calculated as follows: kcat = Vmax/T (see Michaelis-Menten kinetics). For example, carbonic anhydrase has a turnover number of 400,000 to 600,000 s, which means that each carbonic anhydrase molecule can produce up to 600,000 molecules of product (bicarbonate ions) per second. In other chemical fields, such as organometallic catalysis, turnover number (abbreviated TON) is used with a slightly different meaning: the number of moles of substrate that a mole of catalyst can convert before becoming inactivated. An ideal catalyst would have an infinite turnover number in this sense, because it wouldn't ever be consumed, but in actual practice one often sees turnover numbers which go from 100 to a million or more. The term turnover frequency (abbreviated TOF) is used to refer to the turnover per unit time, as in enzymology. For most relevant industrial applications, the turnover frequency is in the range of 10 - 10 s (enzymes 10 - 10 s). Acetylcholinesterase (AChE) may be one of the fastest enzymes. It hydrolyzes acetylcholine to choline and an acetate group. One of the earliest values of the turnover number was 3 x 10 (molecules of acetylcholine) per minute per molecule of enzyme. A more recent value at 25 C, pH = 7.0, acetylcholine concentration of 2.5 x 10 M, was found to be 7.4 x 10 min. There may be some 30 active centers per molecule. AChE is a serine hydrolase that reacts with acetylcholine at close to the diffusion-controll...More: http: //booksllc.net/?id=3026307


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Product Details
  • ISBN-13: 9781158506064
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • No of Pages: 20
  • Spine Width: 1 mm
  • Weight: 45 gr
  • ISBN-10: 1158506066
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Sub Title: Katal, Turnover Number, Lintner, Enzyme Unit
  • Width: 229 mm


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