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相关概念视频

Lenz's Law01:15

Lenz's Law

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The direction in which the induced emf drives the current around a wire loop can be found through the negative sign. However, it is usually easier to determine this direction with Lenz's law, named in honor of its discoverer, Heinrich Lenz (1804–1865). Lenz's law states that the direction of the induced emf drives the current around a wire loop always to oppose the change in magnetic flux that causes the emf.
If a bar magnet is moved toward a coil such that the magnetic flux...
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FISH - Fluorescent In-situ Hybridization02:07

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Fluorescence in situ hybridization, or FISH, was developed in the early 1980s and has quickly become one of the most widely used techniques in cytogenetics. Labeled probes are used to bind complementary DNA or RNA sequences on a chromosome or in a region within a cell. Earlier, the probes could only be obtained by cloning or reverse transcription of a DNA template. Currently, the probe oligonucleotides can be synthesized synthetically. Additionally, with the advancement of optical techniques,...
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Ohm's Law01:21

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Many materials exhibit a simple relationship between the values of current, voltage, and resistance, known as Ohm’s law. The current that flows through most substances is directly proportional to the voltage applied to them. The German physicist Georg Simon Ohm (1787–1854) was the first to demonstrate experimentally that the current in a metal wire is directly proportional to the voltage applied. Any material, component, or device that obeys Ohm’s law, where the current...
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ortho–para-Directing Deactivators: Halogens01:24

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Halogens are ortho–para directors. They are more electronegative than carbon. Therefore, as ring substituents, they can withdraw electrons through the inductive effect and deactivate the aromatic ring towards electrophilic substitution. Halogens also have an electron-donating resonance effect on the ring, which influences the orientation of the incoming electrophile. If an electrophile attacks at the ortho or the para position, the halogen donates electrons and stabilizes the intermediate...
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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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相关实验视频

Updated: Jul 27, 2025

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
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(我认为这是一个很好的选择.

Bakr F Abdel-Wahab1, Abdelbasset A Farahat2,3, Mohamed S Bekheit4

  • 1Applied Organic Chemistry Department, Chemical Industries Research Institute, National Research Centre, Dokki, Giza 12622, Egypt.

IUCrData
|June 8, 2023
PubMed
概括

这项研究详细介绍了C25H19N5O3的晶体结构,揭示了不对称单位内的两个不同的分子构造. 化合物中的化合物.

关键词:
碳水化合物 碳水化合物晶体结构 晶体结构异循环的不同循环.这就是伊萨酸.这些是Pyrazoles.综合合成是一种合成.

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科学领域:

  • 晶体学 晶体学是指结晶学.
  • 分子结构分子结构
  • 超分子化学 超分子化学

背景情况:

  • 了解分子构造对于预测化学性质至关重要.
  • 分子间相互作用,如键和pi-pi堆叠,决定了晶体包装和材料特性.

研究的目的:

  • 为了阐明标题化合物的晶体结构,C25H19N5O3.3.
  • 在不对称的单元中分析独立分子之间的构造差异.
  • 识别和描述晶格中存在的分子间相互作用.

主要方法:

  • 使用单晶X射线衍射来确定分子和晶体结构.
  • 对两个独立的分子进行了形态分析.
  • 确定和描述了分子间相互作用,包括N-HO键和π-π堆叠.

主要成果:

  • 不对称的单元包含两个独立的C25H19N5O3分子,其构造细微不同.
  • 晶体结构由一个N-HO键网络稳定.
  • 在相邻分子的芳香环之间观察到显著的π-π堆叠相互作用.

结论:

  • 结构分析为C25H19N5O3.3的固态行为提供了基本的见解.
  • 确定的分子间相互作用是观察到的晶体包装的关键.
  • 这些详细的结构信息可以为未来关于该化合物的特性和应用的研究提供信息.