Tachibana M, Koizumi H, Izumi K, Kajiwara K, Kojima K
Graduate School of Integrated Science, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama 236-0027, Japan.
J Synchrotron Radiat. 2003 Nov 1;10(Pt 6):416-20. doi: 10.1107/s0909049503020417. Epub 2003 Oct 10.
Large tetragonal hen egg-white (HEW) lysozyme crystals have been grown by a salt concentration-gradient method. The grown crystals, of thicknesses greater than 1.5 mm, were observed by means of X-ray topography using white-beam synchrotron radiation. Line contrasts clearly appeared on the Laue topographs. Extinction of the line images was observed in specific reflections. These results mean that the observed lines correspond to dislocation images. From the extinction criterion it is shown that the predominant dislocations are of screw character with <110> Burgers vectors. In addition, dislocation loops with [001] Burgers vectors have been found in a tetragonal HEW lysozyme crystal including some cracks. These results are discussed in the light of dislocation elastic energy and slip systems in the crystals.
通过盐浓度梯度法生长出了大的四方晶系鸡蛋清（HEW）溶菌酶晶体。所生长的厚度大于1.5毫米的晶体，借助于使用白光同步辐射的X射线形貌术进行了观察。在劳厄形貌图上清晰地出现了线状对比度。在特定反射中观察到了线状图像的消光。这些结果意味着所观察到的线对应于位错图像。根据消光准则表明，主要位错是具有<110>柏氏矢量的螺型位错。此外，在一个包含一些裂纹的四方HEW溶菌酶晶体中发现了具有[001]柏氏矢量的位错环。根据晶体中的位错弹性能和滑移系对这些结果进行了讨论。
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