著者
古谷野 哲夫
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.56, no.5, pp.319-322, 2014-10-31 (Released:2014-10-31)
参考文献数
6
被引用文献数
1

Chocolate consists of solid particles such as cocoa, sugar, and milk solids which are dispersed in a continuous fat phase. The major fat in chocolate is cocoa butter, and it is crystallized at room temperature, so chocolate is a food which we eat crystals. Therefore, fat crystals play a great role in chocolate quality and storage stability. In this paper, polymorphism of cocoa butter and the transformation of polymorphic forms are reviewed including recent results.
著者
今崎 剛 高木 雄一郎
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.54, no.5, pp.292-299, 2012-10-31 (Released:2012-11-06)
参考文献数
13

Deciphering structures of the multi-protein complexes is vital to understand biology. However, the large size, complexity, heterogeneity, and typically low abundance in their native sources, have often precluded successful structural analysis of the multi-protein machines. We have determined the crystal structure of the Mediator Head module (7 subunits, 223 kDa), an essential component in RNA polymerase II transcription. Our success depended on addressing series of challenges unique to structure determination of multi-protein complexes. We anticipate that our approach will serve as a paradigm for structural analysis of the eukaryotic multi-protein complexes that regulate vital cellular processes in the future.
著者
中川 敦史
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.35, no.5, pp.327-333, 1993-10-25 (Released:2010-09-30)
参考文献数
21
被引用文献数
3 4

Flower colors, from red through purple to blue, are mostly from anthocyanins. Although there are many colors, only a few anthocyanins are found. We have succeeded to solve the structure of real anthocyanin and a sugar containing flavonoid, Cd-commelinin, using the Weissenberg camera for macromolecular crystallography with imaging plates at the Photon Factory. The blue flower-color development and the stability of the color can be explained by metal complexation of anthocyanin and intermolecular hydrophobic association. Commelinin is a new type of stoichiometric supramolecule, which consists of low molecular mass components.

7 0 0 0 OA 学会ニュース

出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.56, no.3, pp.News3-News3, 2014-06-30 (Released:2014-07-09)
著者
大場 茂
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.59, no.6, pp.284-292, 2017-12-31 (Released:2017-12-31)
参考文献数
14

SHELXT is a revolutionary program which solves the structure assuming space group P1, and determines the space group type based on the assigned Laue group and calculated P1 phase angles. The background and procedures of the computation will be summarized, and important points to check the results will be noted.

5 0 0 0 OA 氷の相転移

著者
東 晃
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.14, no.6, pp.274-285, 1972-12-25 (Released:2010-09-30)
参考文献数
37
被引用文献数
2
著者
竹内 慶夫
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.27, no.1, pp.40-46, 1985-01-30 (Released:2010-09-30)
参考文献数
5
被引用文献数
1
著者
ネスポロ マッシモ
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.59, no.4, pp.150-158, 2017-08-31 (Released:2017-08-31)
参考文献数
14
被引用文献数
2
著者
熊崎 薫 濡木 理 石谷 隆一郎
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.56, no.4, pp.230-235, 2014-08-31 (Released:2014-09-03)
参考文献数
15

Structural determination of membrane proteins is a key step to understand the molecular mechanisms of the membrane proteins. Lipidic cubic phase (LCP) crystallization is a technique to crystallize the membrane proteins in lipid environment and one of the effective approaches for the membrane protein crystallization. In this article, we describe the overview of crystallization of the membrane proteins in LCP, including the basic principles and procedures of LCP crystallization.
著者
山本 昭二
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.49, no.1, pp.6-11, 2007-02-28 (Released:2010-09-30)
参考文献数
14

Recently a software package for the structure analysis of quasicrystals has been released, giving a better environment for determining guasicrystal structures. Therefore we can analyze their structures if we know data collection and indexing methods and a theory of structure analysis. At this occasion, their structure analysis and its recent development have shortly been reviewed.
著者
平田 秋彦 陳 明偉
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.53, no.5, pp.326-331, 2011-10-31 (Released:2011-11-20)
参考文献数
24

Local structural order in a metallic glass was investigated by Angstrom beam electron diffraction using an aberration corrected scanning transmission electron microscope. The coherent electron probe with a diameter of 0.3 - 0.4 nm was successfully obtained by using Ronchigram method. The fine electron probe enables us to pick up Angstrom-scale local structure information which cannot be obtained by conventional diffraction methods and thereby provide a direct evidence of short- to medium-range order in metallic glasses with the help of ab-initio molecular dynamics simulation.
著者
近藤 次郎
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.60, no.2-3, pp.121-128, 2018-05-31 (Released:2018-06-02)
参考文献数
23

DNA is very attractive as bio-nanomaterials, since it is chemically stable, biocompatible, less toxic, environmentally friendly and easy to synthesize. In addition, the discovery of metal-mediated base pairs, such as T-Hg(II)-T and C-A(gI)-C, has inspired scientists to develop several nanodevices including heavy metal sensor and trapping beads. Recently, we have successfully developed a silver-DNA hybrid nanowire composed only of silver-mediated base pairs, in which Ag(I)make uninterrupted one-dimensional array along the DNA helical axis. In addition, its structure was solved by high-resolution X-ray crystallography. In this article, I present a variety of complicated and beautiful DNA structures and discuss the future outlook of “DNA structural bio-nanotechnology”.
著者
ネスポロ マッシモ
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.59, no.5, pp.210-222, 2017-10-31 (Released:2017-11-03)
参考文献数
6
著者
北所 健悟 西村 昂亮 神谷 重樹 堀口 安彦
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.55, no.3, pp.223-229, 2013-06-30 (Released:2013-07-02)
参考文献数
38

Clostridium perfringens enterotoxin(CPE)is a cause of food poisoning and is considered a pore-forming toxin which damages target cells by disrupting the selective permeability of the plasma membrane. We determined the crystal structure of the full-length CPE at 2.0 Å. The overall structure of CPE displays an elongated shape, composed of three distinct domains, D1, D2, and D3. In this structure, the pore-forming domain(Val81〜Ile106)of CPE has alternating pattern of polar and hydrophobic residues and forms α-helix. This characteristic sequence is frequently observed in β pore-forming toxin families as typified by α-hemolysin. These results indicate that CPE behaves as β pore-forming toxins.
著者
三宅 静雄 岡 邦雄
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.4, no.1, pp.31-36, 1962-06-25 (Released:2010-09-30)
著者
中村 顕 平林 佳 田之倉 優
出版者
日本結晶学会
雑誌
日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日
vol.59, no.4, pp.182-187, 2017-08-31 (Released:2017-08-31)
参考文献数
23

Microgravity environment has been used to obtain high-quality crystals. Strong magnetic force produced by a superconducting magnet can cancel out the gravity force, enabling construction of quasi-microgravity environment on earth. We developed a protein crystallization system which is composed of a superconducting magnet for the magnetic force-based quasi-microgravity and an inverted periscope for in situ observation of crystal growth. Crystals grown in the system showed improved and homogeneous quality.