Affiliation: | aDepartment of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 151-921, Republic of Korea;bKorea Institute of Machinery and Materials, Daejeon, 305-343, Republic of Korea;cDepartment of Biosystems & Biomaterials Science and Engineering, Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Republic of Korea |