Outstanding Paper Awards Subcommittee of Journal of Chemical Engineering of Japan has assessed the 187 papers published in volume 40 into 2007, and the editorial board finally selected the four papers for JCEJ Paper Awards of 2007; those are the papers on "Incorporation of Capillary-Like Structures into Dermal Cell Sheets Constructed by Magnetic Force-Based Tissue Engineering," "Water Quality Control for Intensive Shrimp Culture Ponds in Developing Countries Using Ammonia-Nitrogen Uptake by Seaweed," "Numerical Analysis of the Mixing Process of a Heterogeneously Viscous System with High Concentration Slurry Liquids in a Stirred Vessel," and "Production of Fuel Gas through the Hydrothermal Gasification of Wastewater Using Highly Active Carbon-Base Catalyst."