Scitable is part of of Nature Publishing Group, which is the publisher of Nature, Scientific American and about 70 other magazines.   Vikram Savkar, Scitable's SVP of publishing, says 
"Scitable is an online learning space for science and what that means is that it has a library of very high quality content that we have created." He continued, "It's not crowd-sourced Wiki(pedia) content. It's content that editorially we've commissioned and reviewed and vetted in all the life sciences."