All three e-journals published by MDPI (http://www.mdpi.org/natsci/natscij.htm) are mentioned in a paper published in Chemical & Eng. News at http://pubs.acs.org/email/cen/html/082200023342.html This paper is not free. But the paper at this location seems free. Can you open it? MDPI has financial problem to publish them for free. I am now trying to get adequate financial support from sponsors and from authors. It is difficult to sell online access license. Shu-Kun -- Dr. Shu-Kun Lin Molecular Diversity Preservation International (MDPI) Saengergasse 25, CH-4054 Basel, Switzerland Tel. +41 79 322 3379, Fax +41 61 302 8918 E-mail: lin ( ( at ) ) mdpi.org http://www.mdpi.org/lin/