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相关概念视频

Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...

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相关实验视频

Updated: Jun 20, 2026

Three-dimensional Optical-resolution Photoacoustic Microscopy
08:31

Three-dimensional Optical-resolution Photoacoustic Microscopy

Published on: May 4, 2011

功能激活的小核糖体亚单元的结构,分辨率为3.3安格斯特罗姆.

F Schluenzen1, A Tocilj, R Zarivach

  • 1Max-Planck-Research Unit for Ribosomal Structure, Hamburg, Germany.

Cell
|September 28, 2000
PubMed
概括

在Thermus thermophilus小核糖体子单元.

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科学领域:

  • 分子生物学分子生物学
  • 结构生物学 结构生物学
  • 生物化学 生物化学

背景情况:

  • 小核糖体子单元对于在翻译过程中解码遗传信息至关重要.
  • 了解它的结构可以了解蛋白质合成的基本机制.

研究的目的:

  • 为了阐明来自Thermus thermophilus的小核糖体子单元的详细结构.
  • 确定RNA和蛋白质在核糖体功能中的作用,特别是解码和转位.

主要方法:

  • 对Thermus thermophilus小核糖体子单元的高分辨率结构分析.
  • 核酸位置的详细追踪和蛋白质折叠的确定.

主要成果:

  • 解码中心完全由RNA,定位信使RNA (mRNA) 和转移RNA (tRNA) 组成.
  • 一个类似锁的RNA结构包围着mRNA,增强了进程性和忠实性.
  • 扩展RNA元素传递结构变化,将遥远的核糖体区域连接到mRNA转位.

结论:

  • RNA核心在小核糖体子单元的功能中起着主导作用.
  • 蛋白质在很大程度上是外围的或作为链接器,可能有助于转位方向性.