著者

冨田 研一

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.23, no.5, pp.289-298, 1981-09-30 (Released:2010-09-30)

参考文献数

36

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The recent progress in single crystal X-ray analysis of DNA fragments involving the oligomers having alternating cytosine-guanine base sequence and novel left-handed double-stranded helical structure is reviewed and all the possible requisite conditions for providing the handedness of DNA structure are also evaluated.

著者

秋光 純 富本 晃吉

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.34, no.5, pp.273-282, 1992-10-30 (Released:2010-09-30)

参考文献数

26

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The current status of oxide superconductors is briefly reviewed from a crystal structure perspective. Tokura et al. recently classified high-temperature superconductors using block layer concept. We propose a new “layer” concept and discuss the possibility of new block layers by reconstructing the layers. As an example, we present new high-Tc materials containing CO3 by combining an “old” and new block layers recently discovered. Finally, main roles for realizing the high-Tc superconductors are discussed from the structural point of view.

著者

神山 崇

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.40, no.5, pp.301-307, 1998-10-31 (Released:2010-09-30)

参考文献数

17

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入門講座「結晶学の原点を読む」の第2回目は, リートベルト法です.粉末回折法で構造を決定する非常に有力な手段であるリートベルト法は, 現在非常に多くの利用者がおり, 結晶学の分野では欠かせない解析法となっています.この方法の原理は非常に簡単であり, 測定された粉末回折の強度データのパターンと構造モデルから計算された強度のパターンが一致するように最小自乗法でパラメーターを求めるだけです.このように簡単な原理からなっているにもかかわらず, 計算機のプログラムは非常に複雑で多岐に渡っており, 使用している方々のほとんどにとってそのプログラムの中身はまったくブラックボックスであり, かつ出力された結果に対する吟味もどのようにしたら良いかあまりわからず使っている感があります.また, リートベルト自身によるさまざまな物質への適用例は施設報告が多く手に入りにくいものです.そのような中には, 現在の単結晶の実験からみて明らかに間違った結果を出している例も見られます.これも, 当時の技術力と言うよりは, 相転移のような微妙な構造変化の問題を取扱う時, リートベルト法は非常に注意が必要であると言う今日的な問題です.これら, 粉末回折でのリートベルト法の有利な点や適用範囲は何か, また, リートベルト自身がどのような問題点や注意点がこの方法にあると考えていたのかを原著論文で見ることは大変意義があると言えます.今回は, J. Appl. Cryst.に投稿されたリートベルト法の原点とも言える論文を易しく解説していただきます.

著者

都築 誠二 本田 一匡

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.46, no.2, pp.165-171, 2004-04-30 (Released:2010-09-30)

参考文献数

27

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Ab initio molecular orbital calculation is becoming a powerful tool for studying inter-molecular interactions in crystals. The effects of basis set and electron correlation and the performance of density functional methods are reviewed. Model chemistry calculations and classification of intermolecular interactions are briefly mentioned. Some examples of high-level ab initio computations of intermolecular interactions are also presented.

著者

仁田 勇

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.19, no.5, pp.269-276, 1977 (Released:2010-09-30)

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Reminiscences are given out of the early stages of the development in x-ray crystallography, both in Japan and abroad. Activities in Prof. Ewald's school in Germany, those of Prof. Bragg's in England, Prof. Terada's and Nishikawa's in Japan are described.Prof. Nishikawa's contribution concerning the space group theory in the structure analysis is brought to attention. Early works of Prof. Nitta on organic crystals are also described.Some x-ray photographs taken by Prof. Nishikawa and Prof. Nitta in the early period from 1913 to 1925 are reproduced. (abstract by the editor)

著者

長岡 伸一 西奥 義憲 小原 敬士 向井 和男

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.40, no.1, pp.119-123, 1998-02-28 (Released:2010-09-30)

参考文献数

40

被引用文献数

1

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Since a vitamin E radical produced by the antioxidant reaction of vitamin E causes damage to vital functions, ubiquinol and vitamin C regenerate a vitamin E molecule from a vitamin E radical in vivo. The kinetic studies of the regeneration reactions have been carried out in solutions by means of stopped-flow spectroscopy. Substantial deuterium kinetic-isotope-effects on the second-order rate constants have been observed in both the reactions of ubiquinol and vitamin C. Furthermore, a deviation from a linear relationship in the Arrhenius plot has been observed in the reaction of ubiquinol. These results suggest that the tunneling effect plays an important role in the regeneration reactions in various tissues and mitochondria.

著者

興野 純

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.49, no.6, pp.321-327, 2007-12-25 (Released:2010-09-30)

参考文献数

25

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Light-induced phase transformation from realgar to pararealgar has been studied by means of single-crystal X-ray diffraction and X-ray photoelectron spectroscopy. The photochemical degradation causes the increase of As4S4 intermolecular distances and the production of the As4S5 molecules. The results suggest the following cyclic process. 1st : an S atom in the As4S5 is released from one of the As-S-As linkages in As4S5 which becomes the As4S4 pararealgar molecule, 2nd : the free S atom is re-attached to another As4S4 realgar molecule and reproduces an As4S5 molecule, and 3rd : the As4S5 is again divided into an As4S4 pararealgar molecule and an S atom.

著者

長瀬 敏郎

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.42, no.6, pp.469-473, 2000-12-22 (Released:2010-09-30)

参考文献数

25

被引用文献数

1 1

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External form of polyhedral crystal provides information on the structural feature of the crystal. This article describes the relation between the external form and the structure of crystals.

著者

芦田 玉一

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.38, no.6, pp.378-388, 1996-12-30 (Released:2010-09-30)

参考文献数

4

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Introduction to elementary protein crystallography including items such as, features of protein crystals, crystallization of proteins, the heavy atom isomorphous replacement method, model building and refinement, and a brief history of proten crystallography, is presented.

著者

河田 脩二

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.40, no.1, pp.32-36, 1998-02-28 (Released:2010-09-30)

参考文献数

38

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Phase transitions in ice are summarized in aspect of the hydrogen bond and its network Recent works and developments in phase transition from Ih to the ordered phase, phase transitions between high pressure phases: VII, VIII and X, and amorphous-amorphous phase transition are centrally reviewed.

著者

吉朝 朗

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.43, no.4, pp.297-305, 2001-08-31 (Released:2010-09-30)

参考文献数

9

被引用文献数

2 1

著者

石井 靖

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.49, no.1, pp.55-60, 2007-02-28 (Released:2010-09-30)

参考文献数

17

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First-principles calculation of electronic structures of approximant crystals is a reliable tool for studying cohesion mechanism and electronic properties of real quasicrystals. This article aims at explaining the first-principles calculation as methodology of quasicrystal reaseach. After brief introduction of approximant and methods of the first-principles calculations, we present several approaches, including the tight-binding method and the plane-wave-basis method, for Cd-M (M = Ca, Mg) binary systems.

著者

末永 和知

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.44, no.4, pp.234-239, 2002-08-31 (Released:2010-09-30)

参考文献数

8

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Electron microscopy and spectroscopy with the single-atom sensitivity enables us to obtain a direct image of the intra-molecular structure and chemical identification of individual metallofullerenes encapsulated inside single-walled carbon nanotubes, so-called peapods. By a comparison of high resolution images with a simulation to extract the relative atom positions for encaged metal atom in each molecule, distribution of molecular orientation and its interaction between adjacent molecules in metallofullerene-peapods have been statistically analyzed. Moreover the techniques described here demonstrates the possibilities to observe individual chemical reaction inside carbon nanotubes.

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.25, no.1, pp.21-37, 1983

著者

佐々木 聡

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.38, no.4, pp.267-279, 1996-08-30 (Released:2010-09-30)

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This article provides an opportunity for young researchers and students to familiarize themselves with the use of the International Tables for Crystallography.

著者

尾関 智二

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.43, no.6, pp.391-398, 2001-12-31 (Released:2010-09-30)

参考文献数

7

著者

高田 昌樹

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.54, no.5, 2012

著者

蓮 精 嘉村 茂邦

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.23, no.3, pp.217-226, 1981-05-30 (Released:2010-09-30)

参考文献数

8

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A gem opal consists of monodisperse colloidal spheres of silica being arranged in orderly arrays. This must have been formed in the geological past from a colloidal suspension of silica and then be desicated. The formation process from the suspension would be a sort of the phase transition from a disordered to an ordered state which is seen in a monodisperse latex. This transition is characterized by a repulsive interaction between the particles, and recently identified as Kirkwood-Alder transition that is considered to be an essence of the liquid-solid transition.The opal structure is the same as that in monodisperse latexes which can be seen under a light microscope. It is interesting that such structures reflect some aspects of the atomic structure in crystals. There are sometimes found, in multicomponent opals, superstructures such as AlB2-and CaZn13-type and these are also found in binary mixtures of monodisperse latexes.Now colloid science is opening a new aspect in the investigation of the structure of alloys and some compounds.

著者

植草 秀裕

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.38, no.5, pp.313-323, 1996-10-31 (Released:2010-09-30)

参考文献数

1

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Basic ideas and practical tips of the direct methods are presented for the beginners of crystal structure analysis.

著者

市川 瑞彦

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.40, no.1, pp.10-18, 1998-02-28 (Released:2010-09-30)

参考文献数

70

被引用文献数

1 1

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A review is given of the deuteration effect on the crystal structure, in particular on the hydrogen-bond system, and its relation to the phase transition. The correlation between hydrogen-bond parameters and some examples of peculiar phase diagrams between deuterium content and temperature are discussed in the context of the geometric isotope effect. Similarity and difference between the deuteration effect and the negative pressure effect are discussed in the case of KH2PO4 and squaric acid (H2C4O4) . It is pointed out that the hydrogen bond is not necessarily the softest part of the crystal as usually assumed, and pressure effect is responded by rotation of the PO4 or C4O4 group as well. The case of (NH4) 3H (SO4) 2 is discussed as an example where a surprising similarity between deuteration and positive pressure effect is seen in their phase diagrams.