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相关概念视频

Comparison between RL and RC circuits01:24

Comparison between RL and RC circuits

An RC circuit consists of resistance and capacitance, while in an RL circuit, capacitance is replaced by an inductor. RL and RC circuits are first-order differential circuits that store energy. An RC circuit stores energy in the electric field, while an RL circuit stores energy in the magnetic field. When connected to a battery, an RC circuit charges the capacitor, causing the current to decrease from maximum to zero upon being fully charged. This increases the voltage across the capacitor from...
Calculation of Self-inductance01:29

Calculation of Self-inductance

The self-inductance of a circuit, often simply called the inductance, is a purely geometric factor that depends only on the circuit component's structure. More specifically, it depends on the shape and size of the component that lets the flux pass through it, thus inducing an electric field that opposes any current passing through it.
Since the effect of the induced electric field and the back EMF generated depends on the rate of change of current and the self-inductance, the inductance...
Absorption of Radiation01:05

Absorption of Radiation

The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
Method of Sections: Problem Solving II01:30

Method of Sections: Problem Solving II

Consider an arbitrary truss structure composed of diagonal, vertical, and horizontal members fixed to the wall. To calculate the force acting on members CB, GB, and GH, method of sections can be used. The loads and lengths of the horizontal and vertical members are known parameters, as shown in the figure.
Work01:14

Work

Work is a fundamental concept of mechanical engineering and has many applications. Understanding how work is calculated and the different types of work can help us better understand physical processes and provide insights into complex problems.
Work is defined as the result of a force acting on an object, causing it to move along the line of action of force. It is also defined as the process of transferring energy through the application of force on an object, resulting in its displacement.
Learning Disabilities01:25

Learning Disabilities

Learning disabilities are cognitive disorders caused by neurological impairments that affect cognitive functions like language and reading, without indicating overall intellectual or developmental challenges. These disabilities differ from global intellectual or developmental disabilities as they are limited to distinct cognitive functions. Common learning disabilities include dysgraphia, dyslexia, and dyscalculia, each of which impacts unique aspects of learning.
Dyslexia
Dyslexia is a...

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相关实验视频

Updated: Jul 19, 2026

Decomposing the Variance in Reading Comprehension to Reveal the Unique and Common Effects of Language and Decoding
06:33

Decomposing the Variance in Reading Comprehension to Reveal the Unique and Common Effects of Language and Decoding

Published on: October 11, 2018

抄本辅助的抄本校对阅读

Nikolay Zenkin1, Yulia Yuzenkova, Konstantin Severinov

  • 1Waksman Institute, Rutgers University, Piscataway, NJ 08854, USA. nicserzen@mail.ru

Science (New York, N.Y.)
|July 29, 2006
PubMed
概括

依赖DNA的RNA聚合酶 (RNAPs) 通过校对机制确保精确的基因表达. 新生RNA转录中的一个错误的核酸触发了水解,纠正了转录延长过程中的错误,使遗传稳定.

科学领域:

  • 分子生物学分子生物学
  • 遗传学 是一个遗传学.
  • 生物化学 生物化学

背景情况:

  • 稳定的遗传和精确的基因表达取决于核酸合成的忠实性.
  • 通过DNA依赖RNA聚合酶 (RNAPs) 控制转录忠实性的精确机制仍然不完全理解.
  • 了解RNAP忠实性对于理解遗传稳定性和预防疾病至关重要.

研究的目的:

  • 阐明依赖DNA的RNA聚合酶 (RNAPs) 确保转录保真性的分子机制.
  • 为了调查新生转录的3'末端在转录延长期间校对中的作用.

主要方法:

  • 研究了新生RNA转录的3'-终端核酸在刺激水解活性中的作用.
  • 利用生物化学分析来监测RNAP活性中心内的二结合液解.
  • 比较了正确与错误结合的核酸引起的水解刺激.

主要成果:

  • 新生转录的3'端近位核酸积极参与RNAP活性中心.
  • 这种核酸刺激了前最后一个基键的水解,特别是在错误结合时.
  • 水解反应有效地校对和纠正延长过程中大多数错误整合事件.

结论:

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  • 取决于DNA的RNA聚合酶具有涉及转录水解的内在校对机制.
  • 错误结合的核酸触发了增强的水解,作为维持转录保真性的关键因素.
  • 这种机制对于确保遗传稳定性和精确的基因表达至关重要.