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Proceedings of the Japan Academy, Ser. B, Physical and Biological Sciences

Vol. 85 No. 10 (2009)

  Vol. 85 No. 10 (2009)
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Reviews
Dispersion-controlled slow light in photonic crystal waveguides
Toshihiko BABA, Jun ADACHI, Norihiro ISHIKURA, Yohei HAMACHI, Hirokazu SASAKI, Takashi KAWASAKI and Daisuke MORI
Proc. Jpn. Acad., Ser. B, Vol. 85, 443-453 (2009) [abstract] [PDF]
Extension of frequencies from maser to laser. How the laser evolved and was extended to terahertz during my research life —A personal review
Jun-ichi NISHIZAWA
Proc. Jpn. Acad., Ser. B, Vol. 85, 454-465 (2009) [abstract] [PDF]
Original Papers
Electrical conductivity of orthopyroxene: Implications for the water content of the asthenosphere
Lidong DAI and Shun-ichiro KARATO
Proc. Jpn. Acad., Ser. B, Vol. 85, 466-475 (2009) [abstract] [PDF]
Heterogeneous electrical structure of Kozu-shima volcanic island, Japan
Yoshiaki ORIHARA, Masashi KAMOGAWA, Toshiyasu NAGAO and Seiya UYEDA
Proc. Jpn. Acad., Ser. B, Vol. 85, 476-484 (2009) [abstract] [PDF]
Development of newly designed VHF interferometer system for observing earthquake-related atmospheric anomalies
Isao YAMAMOTO, Hironobu FUJIWARA, Masashi KAMOGAWA, Atsushi IYONO, Valeri KROUMOV and Takashi AZAKAMI
Proc. Jpn. Acad., Ser. B, Vol. 85, 485-490 (2009) [abstract] [PDF]
Recombinant α-actin for specific fluorescent labeling
Atsuko H. IWANE, Masatoshi MORIMATSU and Toshio YANAGIDA
Proc. Jpn. Acad., Ser. B, Vol. 85, 491-499 (2009) [abstract] [PDF]
Mechanism of cadmium induced crystal defects in developing rat tooth enamel
Mitsuo KAKEI, Toshiro SAKAE and Masayoshi YOSHIKAWA
Proc. Jpn. Acad., Ser. B, Vol. 85, 500-507 (2009) [abstract] [PDF]
Cover Illustration

Illustration: Terahertz absorption spectra of five nucleobases in a wide frequency range of 0.8 – 5.4 THz, which were measured with use of a GaP THz wave generator developed by Nishizawa et al.

 In 1963 Jun-ichi Nishizawa predicted coherent terahertz electromagnetic wave generation via the resonance of phonons and molecular vibrations. In 1980 Nishizawa and Suto, following this proposal, developed and realized a semiconductor Raman laser using a GaP crystal, from which a terahertz (THz) wave was actually generated. Recently, they constructed a THz generator with automatic scanning control, which made it possible to measure spectral shapes of various organic molecules in a very wide frequency range (0.8 – 5.4 THz). The illustration shows absorption spectra of five nucleobases which constitute DNA and RNA. Marked differences are revealed among these molecules in the wide frequency range. Taken from a review article of J. Nishizawa in this issue pp. 454-465.

Toshimitsu Yamazaki
RIKEN Nishina Center
Member of the Japan Academy

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