著者

松村 浩由

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.50, no.4, pp.245-253, 2008-08-29 (Released:2010-09-30)

参考文献数

27

被引用文献数

1

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Phosphoenolpyruvate carboxylase (PEPC) and ribulose 1, 5-bisphosphate carboxylase/oxygenase (Rubisco) play pivotal roles in CO2 fixation. Both of the enzymes are involved in photosynthetic efficiency of plants. Here, we report the crystal structures of PEPC and Rubisco; the inactivated Escherichia coli PEPC complexed with L-aspartate, the activated maize PEPC complexed with a sulfate, the Chlamydomonas Rubisco complexed with transition state analogue, and Galdieria Rubisco complexed with a sulfate. X-ray crystallographic analysis and site-directed mutagenesis studies revealed the allosteric regulation and the reaction mechanism of PEPC. The crystallographic studies on Rubisco provided detailed understanding of activity and regulation in Rubisco.

著者

杉本 秀彦

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.63-69, 1998-02-28 (Released:2010-09-30)

参考文献数

15

---

The present status of our understanding of the mechanism of the phase transition from a ferroelectric phase (or an antiferroelectric phase) to a paraelectric phase in hydrogen bonded crystals is reviewed. Discussions are focused on the isotope effects on the phase transition temperature and hydrogen bond lengths. The mechanism of proton transfer is also discussed.

著者

渡辺 隆

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.37, no.4, pp.206-214, 1995-08-30 (Released:2010-09-30)

参考文献数

13

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In phyllosilicate minerals, specially in fine-grained clay minerals, it is well known that interstratification is formed among two or more kinds of clay minerals being elementary component layers. The interstratification can be described by using the statistical theory and analysed with the XPD theory concerning one-dimensionally disordered crystals. Recently, the interpretation of the interstratified structure of clay minerals has attracted special interest in crystallographical and geochemical fields. This text gives an interpretation to the Interstratified structure and points at geochemical interest focusing to the crystallochemical problem of interstratified clay minerals.

著者

千田 俊哉 福田 雅夫

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.45, no.1, pp.71-75, 2003-02-28 (Released:2010-09-30)

参考文献数

10

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Two dioxygenases found in the PCB degradation pathway, biphenyl dioxygenase and extradiol type catecholic dioxygenase, play key roles in the pathway. The crystal structures of reaction intermediates of the dioxygenases have revealed the catalytic mechanisms of theses enzymes.

著者

近藤 次郎 竹中 章郎

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.46, no.5, pp.345-351, 2004-10-29 (Released:2010-09-30)

参考文献数

24

被引用文献数

1

---

Recent human genome projects have revealed that exons encoding proteins count only a few percents, whereas many kinds of repetitive sequences occupy more than 50 % of genome. Some of the latter are related to genetic diseases, but their biological functions and structures are still unknown. Two X-ray structures of a short DNA fragment of d (gcGA [G] 1Agc) show that four base-intercalated duplexes are assembled to form an octaplex at a low K+ concentration, in which the eight G5 residues form a stacked double G-quartet in the central part. At a higher K+ concentration, however, the octaplex is split into just two halves. These structural features suggest a folding process according to a double Greek-key motif for eight tandem repeats of d (ccGA [G] 4Agg) found in Variable number of tandem repeat (VNTR) immediately adjacent to the human pseudoautosomal telomere. Such a packaging of the repeats could facilitate slippage of a certain VNTR sequence during DNA replication, to induce length polymorphism by increasing or decreasing of the repeats.

著者

堀 哲哉 森山 英明 田中 信夫

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.39, pp.142-142, 1997

著者

大泊 巌 川原田 洋

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.28, no.2, pp.151-159, 1986-03-30 (Released:2010-09-30)

参考文献数

19

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Structures and defects of heterogeneous interfaces have been discussed using the concept of “coherency”which has been applied to interphase boundaries. Interfacial structures have been classified into three kinds, coherent, semicoherent and incoherent interfaces, depending on lattice mismatch. As a case study of the interface with great mismatch of about 10%, the structure of PtSi/ (111) Si interface has been discussed in detail on the basis of HRTEM images. The interface has been found to be atomically abrupt and has atomic steps which increases local coherency between PtSi and Si. (J. Cryst. Soc. Jpn. 28, 151 (1986) ) .

著者

三浦 裕行

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.45, no.2, pp.145-147, 2003-04-30 (Released:2010-09-30)

参考文献数

4

被引用文献数

75 81

著者

松岡 秀樹

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.41, no.4, pp.213-226, 1999-08-30 (Released:2010-09-30)

参考文献数

38

被引用文献数

19 14

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Fundamental aspects of small-angle scattering technique are duly explained from the very basic points for the beginners and newcommers of this useful technique to study the strucuture of“Vernachlasisgten Dimensionen”.

著者

吉沢 康和

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.21, no.6, pp.342-349, 1979-11-30 (Released:2010-09-30)

参考文献数

24

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The principle and the history of the Doppler broadening method is described. Recent topics of this method for studies of alkali halide crystals and inner electron shell structures are reviewed. In addition, characterics of this method are summarized.

著者

海老原 章郎 新海 暁男 中川 紀子 増井 良治 三木 邦夫 横山 茂之 倉光 成紀

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.48, no.6, pp.403-410, 2006-12-25 (Released:2010-09-30)

参考文献数

29

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The final goal of this research project is the understanding of all fundamental biological phenomena in terms of physical chemistry. As a model organism for the structural and functional studies, an extremely thermophilic bacterium, Thermus thermophilus HB8, is very promising because of the small genome size, the availability of genetic tools for functional analysis, and the thermostability of its proteins (http: //www.thermus.org/) . In this report, we summarize the recent progress of this research project toward the systems biology.

著者

黒岩 芳弘

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.47, no.2, pp.147-153, 2005-04-27 (Released:2010-09-30)

参考文献数

16

被引用文献数

1

---

Electron charge density distributions of perovskite-type dielectric oxides, PbTiO3 (ferroelectric), and PbZrO3 and PbHfO3 (antiferroelectric), have been investigated associated with the phase transitions, by analyzing high-energy synchrotron-radiation powder diffraction data by the maximum entropy method (MEM) /Rietveld method. Two distinctive structural features, that is, disordered Pb atom and anisotropic charge density distributions around O atom, are observed only in PbZrO3 and PbHfO3 in the cubic phase. These features can be a clue to understanding why PbZrO3 and PbHfO3 show antiferroelectric phase transition.

著者

深町 共栄

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.2, pp.51-67, 1977-03-31 (Released:2010-09-30)

参考文献数

47

被引用文献数

2 2

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The anomalous scattering factors of X-rays have been described by the classical and quantum-field theory. Then the results are compared among three different calculations of f' (ω) and f″ (ω) for isolated atoms : (1) by Hönl (quantum theory), (2) by Parratt and Hempstead (semi-empirical theory) and (3) by Cromer and Liberman (relativistic quantum theory) . The fine structures of f' (ω) and f″ (ω) near the absorption edge are also reviewed from the viewpoint of the band theory and the dispersion relation.

著者

瀬戸 誠

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.405-412, 2001-12-31 (Released:2010-09-30)

参考文献数

31

被引用文献数

2 1

---

Recent progress of the study on condensed matter using nuclear resonant scattering of synchrotron radiation is reviewed. One of the most outstanding features of this method is the possibility to obtain the electronic and vibrational characters of the local environment of the resonant nucleus. The theoretical and experimental aspects and some of the experimental results are discussed.

著者

岩崎 準

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.2, pp.121-132, 1977-03-31 (Released:2010-09-30)

参考文献数

49

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A survey of the theory of diffraction symmetry involving anomalous scattering is given, and conditions for the occurrence of Bijvoet differences are discussed in detail. Some applications of Friedel-law violation, especially those to the determination of the space group and various kinds of Fourier techniques, are described.

著者

東 常行

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.45, no.3, pp.171-177, 2003-06-30 (Released:2010-09-30)

参考文献数

12

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Recently, 2D detectors, such as IP (imaging plate) or CCD (chargecoupled device), become popular in single crystal data acquisition. As a practical guide, basic information is discussed on diffraction geometry and data processing of 2D detectors, in comparison with those of four-circle diffractometers. Main topics are a typical flow in data collection, indexing, evaluation of spot positions, data collection strategy, evaluation of integrated intensities, Lorentz factor, and determination of precise cell parameters.

著者

桜井 敏雄

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.28, no.4, pp.281-290, 1986-07-30 (Released:2010-09-30)

参考文献数

12

著者

山本 直紀

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.27, no.1, pp.12-22, 1985-01-30 (Released:2010-09-30)

参考文献数

37

被引用文献数

1

---

Cothordoluminescence (CL) detection system was built up for a transmission electron microscope with scanning units, which enable us to take high-resolution CL images of crystal defects together with crystallographic information. Luminescence or non-luminescence centers localized at dislocations in III-V compound semiconductors, diamond and magnesium oxide were observed using this system. Their natures were studied through the analyses of the TEM and monochromatic CL images and spectral information of the CL light.

著者

小野田 みつ子

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.39, no.5, pp.347-357, 1997-10-30 (Released:2010-09-30)

参考文献数

40

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Many kinds of complicated crystal structures have appeared in the transition metal sulfide system. Simulation by the matrix method could explain the diffuse scattering observed in nonstoichiometric titanium sulfides with stacking faults, in Ti1.42S2 with short-range order of Ti vacancies, and in some channel-type composite crystals such as Ba0.7Cr2S3.7 with two-directional disorder of positions of filling columns. Crystal structures of incommensurate layered composite crystal (PbS) 1.12VS2, columnar composite crystals Ba10/9Fe2S4 and Ba9/8Fe2S4, and incommensurate columnar composite crystals SrxTiS3 (x=1.1-1.2) were successfully analyzed based on the superspace group approach.

著者

松井 良夫

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.39, no.2, pp.157-167, 1997-04-28 (Released:2010-09-30)

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This article is the first introduction to transmission electron microscopy (TEM) for beginners interested in the crystal structure analysis by means of electron diffraction and highresolution electron microscopy. Brief history of TEM, basic arrangements of TEM instruments, how to obtain selected area electron diffraction patterns, and how to prepare specimen by “crushing method”, are described.