Nobuko Takahashi

Waseda University

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Optical activity of Rb₂ZnBr₄

Ferroelectrics (1994)

Nobuko Takahashi Kazuya Saito Itaru Kamiya J. Kobayashi

Abstract All the gyration tensor components of Rb2ZnBr4 were measured by using the high accuracy universal polarimeter (HAUP). We found that only g23 component appeared in the incommensurate phase, the other components always zero in the measured temperature range. Simultaneously we also revealed temperature dependences of birefringence.

Polarimeter

Atmospheric temperature range

Component (thermodynamics)

Gyration

10.1080/00150199408007518

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Citations (1)

Nutritional study on the utilization of krill as a foodstuff. Effect of the addition of SPI.

Nippon Eiyo Shokuryo Gakkaishi (1987)

Nobuko Takahashi Setsu Wada Shuichi Kimura

オキアミの利用に関する栄養学的研究の一環として, とくに分離大豆タンパク質を組みあわせた食餌でラットを飼育し, その生育, 臓器重量, 肝および血清脂質におよぼす影響を検討し, 次のような結果をえた。1) カゼイン群に比較して, SPI群の体重増加は有意に低かった。しかし, SPIにオキアミを組みあわせることにより回復した。2) 血清脂質量はカゼイン群に比較してSPI群で有意に高かった。しかし, SPIにオキアミを組みあわせることにより, カゼイン群と同じ値になった。3) 血清総コレステロール量はカゼイン群に比較し, SPI群, オキアミ群とも差がみられないが, SPIとオキアミを組みあわせると有意に低下した。しかし, これにさらにメチオニンを添加しても, それ以上の低下はみられなかった。以上の成績はオキアミを食品として利用する場合, 植物タンパク質の一つであるSPIを組みあわせることが栄養学的にのぞましいことを示唆している。この研究を行うにあたり, ご助力をいただいた東北大農学部, 川村笑美子助手に感謝いたします。

Antarctic krill

10.4327/jsnfs.40.361

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Optical activity of Gd₂(MoO₄)₃

Ferroelectrics (1994)

Kazuya Saito Toru Asahi Nobuko Takahashi Michi Higano Itaru Kamiya

Abstract Temperature dependences of gyration tensor component g11 and birefringence Δn of Gd2(MoO4)3 were measured at various wavelength by using high accuracy universal polarimeter (HAUP). Spontaneous values of g11 and An in the ferroelectric phase increased with decreasing temperature, but quadratic relations with respect to spontaneous polarization did not hold. The spontaneous Ans showed an anomalous peak at a wavelength of 334.7nm. Such a phenomenon has not been reported to date in any ferroelectrics.

Polarimeter

Gyration

10.1080/00150199408017625

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Citations (5)

Optical activity of [N(CH₃)₄]₂ZnCl₄

Ferroelectrics (1994)

Kazuya Saito Nobuko Takahashi Itaru Kamiya J. Kobayashi

Abstract All the components of gyration tensor and birefringence of [N(CH3)4]2ZnCl4 were measured in its paraelectric, incommensurate and ferroelectric phases by using the high accuracy universal polarimeter (HAUP). Only one component, g23, was found to appear both in the incommensurate and ferroelectric phases, but all the other components zero in the three phases.

Polarimeter

Component (thermodynamics)

10.1080/00150199408007528

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Optical Activity and Electrogyration Effect of Co₃B₇O₁₃I and Cu₃B₇O₁₃Cl^*

Japanese Journal of Applied Physics (1992)

Nobuko Takahashi Masahito Tomizawa J. Kobayashi

Optical gyration studies on Co 3 B 7 O 13 I and Cu 3 B 7 O 13 Cl were conducted by the high accuracy universal polarimeter (HAUP) method. Temperature dependences of the gyration tensor g 12 manifested sharp peaks at improper ferroelectric transition points. The electrogyration coefficient of Co 3 B 7 O 13 I also exhibited a sharp peak at the transition point. Taking our previous work of Fe 3 B 7 O 13 I into account, it was concluded that peculiar temperature dependences of gyration and the electrogyration coefficient are a common nature of ferroelectric boracite crystals.

Gyration

Radius of gyration

Transition point

Monoclinic crystal system

10.1143/jjap.31.3209

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Citations (8)

Optical Activity and Electrogyration Effect of Co_3B_7O_ I and CU_3B_7O_ Cl

Japanese journal of applied physics. Pt. 1, Regular papers & short notes (1992)

Nobuko Takahashi Masahito Tomizawa J. Kobayashi

Source

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Nutritional Study of Ageing (I)

Eiyo to shokuryo/Eiyo To Shokuryo (1969)

Tatsuo Koyanagi Yasumasa Yuguchi Kozo Kitaura Nobuko Takahashi

鉄欠乏によりネズミの血中SH化合物が減少し赤血球は脆弱性を増した。老ネズミの赤血球は若ネズミのより脆弱である。鉄欠乏により胃腺の酸分泌細胞に変化が起きた。

10.4327/jsnfs1949.22.91

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Peak of a gyration tensor component of boracite crystals

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2004)

Toru Asahi Tetsuya Ōsaka Nobuko Takahashi Kazuya Saito J. Kobayashi

According to HAUP measurements, two ferroelectric boracites, Fe3B7O13I and Cu3B7O13Cl, manifest peaks of a gyration component g11 at each Curie point. These phenomena are entirely unintelligible from the usual concepts of the origin of ferroelectricity. Besides, the electrogyration effects of both crystals and also quite different. As has already been determined boracite crystals exhibit characteristic features of being improper ferroelectric. A phenomenological theory of improper ferroelectricity developed by Kobayashi is applied to these anomalous phenomena, and qualitative interpretations are successfully obtained.

Gyration

Component (thermodynamics)

Curie

Phenomenological model

10.1117/12.557863

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Citations (1)

Effect of Dietary Component on Lipid Metabolism : Soy protein isolate and Krill

Nobuko Takahashi Ruriko Sasaki Emiko Ikejiri Inomata Setsu Wada

Component (thermodynamics)

Source

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