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使用液细胞电子显微镜成像DNA构造时的ergodicity问题

Jia-Ye Li¹, Fan Liu^1,2, Jing Xu^1,2

¹Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, National Biomedical Imaging Center, Key Laboratory of Polymer Chemistry & Physics of Ministry of Education, Peking University, Beijing 100871, China.

Proceedings of the National Academy of Sciences of the United States of America

|January 9, 2024

概括

石墨烯液细胞电子显微镜显示,圆形DNA循环相互转换是可逆的. 这种技术就像一个慢动画摄像头一样,在低电子剂量下显示平衡的DNA循环分布.

科学领域:

生物物理学的生物物理.
材料科学材料科学材料科学
电子显微镜电子显微镜

背景情况:

石墨烯液细胞电子显微镜 (GLCEM) 提供了一种新的方法来研究溶液中的生物分子.
了解这些测量的ergodicity对于验证它们的结果至关重要.

研究的目的:

为了评估石墨烯液细胞电子显微镜测量圆形DNA的ergodicity.
为了确定GLCEM中的DNA循环状态是否反映了散装溶液的行为.

主要方法:

使用80keV电子能量和低电子剂量速率 (1-20 e− Å−2 s−1) 进行成像.
分析了石墨烯液体细胞内的圆形DNA分子中循环状态的相互转换和分布.

主要成果:

在循环DNA中观察到循环状态的可逆互转.
证明循环数遵循博尔兹曼分布,与批量溶液行为一致.
在低电子剂量条件下证实了ergodicity.

结论:

石墨烯液细胞电子显微镜是一种用于研究DNA的 ergodic 技术.
该方法充当"慢动作"摄像头,通过时间平均显示平衡的分布.
低电子剂量对于准确表示散装溶液动态至关重要.

关键词:

这就是TEMEM.侵蚀性侵蚀性侵蚀性石墨烯液细胞液体细胞

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