1. Improvement of spatial resolution of a laser-scanning pH-imaging sensor;Nakao;Jpn. J. Appl. Phys.,1994
2. Scanning-laser-beam semiconductor pH-imagining sensor;Nakao;Sensors and Actuators B,1994
3. Observation of microorganism colonies using a scanning-laser-beam pH-sensing microscope;Nakao;J. Ferment. Bioeng.,1995
4. M. Nakao, S. Inoue, T. Yoshinobu and H. Iwasaki, High-resolution pH-imaging sensor for microscopic observation of microorganisms, Tech. Digest, 8th Int. Conf. Solid-State Sensors and Actuators (Transducers '95—Eurosensors IX), Stockholm, Sweden, 25–29 June, 1995, pp. 451–454
5. S. Inoue, M. Nakao, T. Yoshinobu and H. Iwasaki, Chemical imaging sensor using enzyme, Sensors and Actuators B, in press