<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/SearchAction>
<http://www.genengnews.com/Login.aspx?ReturnURL=%2Fgen-articles%2F4-tips-for-selecting-the-right-microscopy-system-for-you%2F4644%2F%3Fkwrd%3DPhotometrics>