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相关概念视频

DNA Topoisomerases02:02

DNA Topoisomerases

34.9K
Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
Types and Mechanism of action
Topoisomerases are divided into two main types. ...
34.9K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.6K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.6K

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相关实验视频

Updated: Jan 17, 2026

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
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Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

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在大尺度上探测拓纠.

Robert Ott1,2, Torsten V Zache1,2, Nishad Maskara3

  • 1University of Innsbruck, Institute for Theoretical Physics, Innsbruck 6020, Austria.

Physical review letters
|September 15, 2025
PubMed
概括
此摘要是机器生成的。

在拓量子物质中测量远程纠是很困难的. 这项研究引入了一种使用局部哈密尔顿变化的新协议,以从小子系统中提取这些纠特征,从而使测量成为可能.

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Large-scale Top-down Proteomics Using Capillary Zone Electrophoresis Tandem Mass Spectrometry
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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科学领域:

  • 量子物理学 量子物理学 是一种量子物理学.
  • 凝聚物质物理学 凝聚物质物理学
  • 量子信息科学 量子信息科学

背景情况:

  • 在拓上有序的量子物质显示复杂的远程纠模式.
  • 子系统是拓秩序的关键指标,但在大型系统中很难测量.

研究的目的:

  • 开发一种用于测量远程拓纠的实用协议.
  • 通过在较小尺度上测量子系统来证明拓秩序.

主要方法:

  • 一个采用哈密尔顿的局部亚亚巴特变形的协议.
  • 从小,有限尺寸子系统的测量中提取通用纠特征.
  • 交易一个指数数量的测量对多项式时间量子进化.

主要成果:

  • 拟议的协议成功地提取了远程拓纠的普遍特征.
  • 已证明适用于各种串网模型,包括阿贝尔阶段和非阿贝尔阶段.
  • 数字模拟证实了该协议在中性原子 tweezer 阵列中的有效性.

结论:

  • 该协议提供了一种可行的方法来测量量子系统中的拓纠.
  • 它大大简化了验证拓秩序的实验要求.
  • 该方法是通用的,可以适应各种量子模拟平台.