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Chem. 2:87. doi: 10.3389/fchem. 2014.00087 Thisarticlewas submitted toChemicalEngineering,a sectionof the journalFrontiers inChemistry. Copyright © 2014MorenoandPêgo.This isanopen-accessarticledistributedunder the terms of theCreativeCommonsAttribution License (CCBY). The use, distribu- tion or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permittedwhichdoesnot complywith these terms. www.frontiersin.org October2014 |Volume2 |Article87 | 67