It looks like it is being advanced as a proprietary technology and they don't want to publish on the mechanism until it is commercialized. However there is a patent http://www.google.com.pg/patents/WO2010012077A1?cl=en
It looks like it is being advanced as a proprietary technology and they don't want to publish on the mechanism until it is commercialized. However there is a patent http://www.google.com.pg/patents/WO2010012077A1?cl=en