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相关概念视频

Weak Base Solutions03:21

Weak Base Solutions

25.5K
Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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Weak Acid Solutions04:02

Weak Acid Solutions

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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
43.5K
Titration of a Weak Acid with a Weak Base01:08

Titration of a Weak Acid with a Weak Base

5.0K
Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...
5.0K
lncRNA - Long Non-coding RNAs02:39

lncRNA - Long Non-coding RNAs

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In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA...
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lncRNA - Long Non-coding RNAs02:39

lncRNA - Long Non-coding RNAs

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Titration Calculations: Weak Acid - Strong Base03:55

Titration Calculations: Weak Acid - Strong Base

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Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
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相关实验视频

Updated: Feb 15, 2026

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
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解读海马的位置代码在弱的太节奏.

Gautam Agarwal1,2, Seiji Akera3, Brian Lustig4

  • 1Department of Natural Sciences, Pitzer College, Claremont, CA, USA. gagarwal@scrippscollege.edu.

Nature communications
|February 13, 2026
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概括

局部场电位 (LFP) 即使没有强大的 θ 振荡,也可以携带空间信息. 人工神经网络揭示了大鼠海马体中位置调节的theta节奏 (pThetas),这表明了神经计算的新解码原理.

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Tuning in the Hippocampal Theta Band In Vitro: Methodologies for Recording from the Isolated Rodent Septohippocampal Circuit
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科学领域:

  • 神经科学是一个神经科学.
  • 计算神经科学是一种神经科学.
  • 人工智能的人工智能

背景情况:

  • 据认为局部场潜力 (LFP) 反映神经协调,但它们在神经计算中的作用尚不清楚.
  • 海马体的太节奏组织了空间导航的位置细胞发射,但在静止时变得不规则.
  • 假定这种不规则会损害空间信息编码.

研究的目的:

  • 挑战假设不规则的 teta 节奏会破坏空间信息的假设.
  • 开发一种方法来检测弱振荡的LFP中的空间信息.
  • 研究解码神经信息的替代原则.

主要方法:

  • 开发了一个人工神经网络来识别LFPs的定位调节的theta节奏 (pThetas).
  • 分析了男性大鼠在导航和静止期间的LFP记录.
  • 将pThetas与主导的theta节奏和人口峰值代码进行比较.

主要成果:

  • 人工神经网络成功地从LFP中识别了pThetas,即使没有强大的theta振荡.
  • 发现pTheta与主要的Theta节奏有所区别.
  • pThetas反映了位置细胞群体之间的节奏协调,并携带空间信息.

结论:

  • 弱而间歇的神经振荡可以传递重要的空间信息.
  • 基于信息的解码原理是有效的分析神经数据与微妙的振荡.
  • 这挑战了关于神经计算需要强振荡的传统观点.