Refusing to twist: demonstration of a line hexatic phase in DNA liquid crystals
Refusing to twist: demonstration of a line hexatic phase in DNA liquid crystals
复制标题
拒绝扭曲：DNA 液晶中线六方相的演示
DOI：
10.1103/physrevlett.84.3105
复制
发表时间：
2000
影响因子：
8.6
通讯作者：
Sirota,EB
中科院分区：
文献类型：
--
作者：
Strey,HH;Wang,J;Podgornik,R;Rupprecht,A;Yu,L;Parsegian,VA;Sirota,EB
我们报告了结论性的高分辨率小角度 X 射线散射证据，表明长 DNA 片段在胆甾相和结晶相之间形成非扭转线六方相。线六方相是具有长程六方键取向有序、长程向列有序、但类似液体（即短程位置有序）的液晶相。到目前为止，还没有在任何其他三维系统中看到过它。通过对X射线散射数据的线形分析，我们发现当线六方相被压缩时，位置顺序会降低。我们认为这种异常行为是 DNA 分子手性性质的结果。
We report conclusive high resolution small angle x-ray scattering evidence that long DNA fragments form an untwisted line hexatic phase between the cholesteric and the crystalline phases. The line hexatic phase is a liquid-crystalline phase with long-range hexagonal bond-orientational order, long-range nematic order, but liquidlike, ie, short-range, positional order. So far, it has not been seen in any other three dimensional system. By line-shape analysis of x-ray scattering data we found that positional order decreases when the line hexatic phase is compressed. We suggest that such anomalous behavior is a result of the chiral nature of DNA molecules.