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相关概念视频

The Nucleus01:32

The Nucleus

The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...
The Nucleus01:25

The Nucleus

The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
Toroids01:27

Toroids

A toroid is a closely wound donut-shaped coil constructed using a single conducting wire. In general, it is assumed that a toriod consists of multiple circular loops perpendicular to its axis.
When connected to a supply, the magnetic field generated in the toroid has field lines circular and concentric to its axis. Conventionally, the direction of this magnetic field is expressed using the right-hand rule. If the fingers of the right hand curl in the current direction, the thumb points in the...
The Nucleus01:25

The Nucleus

The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...

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相关实验视频

Updated: Jun 29, 2026

A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton
05:47

A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton

Published on: July 29, 2018

一个绕的线圈,有一个的核心.

B Bilgiçer1, A Fichera, K Kumar

  • 1Department of Chemistry, Tufts University, Medford, Massachusetts 02155, USA.

Journal of the American Chemical Society
|July 18, 2001
PubMed
概括
此摘要是机器生成的。

这项研究设计了一个化系统,以提高稳定性. 新型化与其碳化合物对应物相比,表现出更高的稳定性和更高的点.

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Tree Core Analysis with X-ray Computed Tomography
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A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton
05:47

A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton

Published on: July 29, 2018

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
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科学领域:

  • 生物化学 生物化学
  • 类化学 类化学
  • 结构生物学 结构生物学

背景情况:

  • 在蛋白质-蛋白质相互作用中,卷状卷状结构至关重要.
  • 设计稳定的系统对于生物分子应用很重要.
  • 化氨基酸为酸修饰提供了独特的特性.

研究的目的:

  • 设计和合成一种高化系统,该系统基于GCN4卷轴.
  • 为了研究化的结构和稳定性特征.
  • 探索化在自组装系统中的潜力.

主要方法:

  • 使用非天然氨基酸 (5,5,5-trifluoroleucine和4,4,4-trifluorovaline) 的的设计和合成.
  • 循环二重化谱法用于评估二次结构.
  • 分析超离心以确定寡合物状态.
  • 瓜尼尼化变性实验,以测量展开的自由能量.

主要成果:

  • 化在溶液中具有高度的α-螺旋性.
  • 它形成了一个稳定的二维物种.
  • 与碳化合物对照剂相比,化呈现出15°C更高的化温度和更高的稳定性.
  • 对化来说,展开的看似自由能量大约为1.0 kcal/mol,对于化来说更大.

结论:

  • 加入三甲基增强了的稳定性.
  • 疏水性三甲基基被有效地从水溶剂中隔离出来.
  • 这项工作提出了一种新方法,用于设计使用直角溶解性质的自组装系统.