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The organic compound citrulline is an α-amino acid. [2] Its name is derived from citrullus, the Latin word for watermelon.Although named and described by gastroenterologists since the late 19th century, it was first isolated from watermelon in 1914 by Japanese researchers Yatarō Koga (古賀彌太郎) and Ryō Ōtake (大嶽了) [3] [4] and further codified by Mitsunori Wada of Tokyo ...
In enzymology, a citrullinase (EC 3.5.1.20) is an enzyme that catalyzes the chemical reaction. L-citrulline + H 2 O L-ornithine + CO 2 + NH 3. Thus, the two substrates of this enzyme are L-citrulline and H 2 O, whereas its 3 products are L-ornithine, CO 2, and NH 3.
Unlimited free storage, 1MB per photo and 10 minutes per video (with image size restrictions). No size restrictions with Pro account. Pinterest: United States Photo sharing/social networking 11,700,000 [21] Unknown Pixabay: Germany [22] Sharing of high-quality public domain photos. Free to browse and download, registration required to contribute.
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Shutterstock, Inc. is an American provider of stock photography, stock footage, stock music, and editing tools; [4] it is headquartered in New York. [5] Founded in 2002 by programmer and photographer Jon Oringer, [6] Shutterstock maintains a library of around 200 million royalty-free stock photos, [7] vector graphics, and illustrations, [8] with around 10 million video clips and music tracks ...
A public domain stock photo titled "frog on palm frond". Stock photography is the supply of photographs that are often licensed for specific uses. [1] The stock photo industry, which began to gain hold in the 1920s, [1] has established models including traditional macrostock photography, [2] midstock photography, [3] and microstock photography. [4]
The StockXpert website in 2009. Until 2009, stock.xchng operated alongside its sister site, Stockxpert.Stockxpert was designed with a near-identical user interface, but functioned as a commercial microstock photography site, allowing users, through a system of online credits, to purchase and download images for a very low cost, often as low as US$1.
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