1. Graduate School of Science and Engineering; Saitama University; Shimo-Ohkubo 255 Sakura Ku Saitama 338-8570 Japan
2. Department of Engineering Geoecology, Laboratory of Engineering NanoBiotechnology; University of Mining and Geology “St. Ivan Rilski”; Bulgaria
3. Materials Research Laboratory; University of Nova Gorica; SI-5000 Slovenia