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相关概念视频

Leaving Groups02:14

Leaving Groups

8.1K
The nature of leaving groups strongly influences the outcome of a nucleophilic substitution reaction.
In general, in a nucleophilic substitution reaction, a nucleophile displaces a functional group, called the leaving group, from the substrate to give a substituted product. A leaving group departs the substrate molecule through heterolytic cleavage, taking the pair of electrons with it to become a relatively stable weak base in the form of an anion or a neutral molecule.  
In a...
8.1K
Discharge Summary Forms01:31

Discharge Summary Forms

824
The discharge summary is crucial as it enables a smooth transition from a healthcare facility to a patient's home or another care setting. This critical document facilitates seamless continuity of care, ensuring patients receive the necessary support and attention.
Here's a detailed look at the key components and guidelines for preparing a discharge summary:
824
Separation of Sister Chromatids02:17

Separation of Sister Chromatids

3.8K
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
3.8K
Hindsight Biases01:12

Hindsight Biases

3.9K
Hindsight bias leads you to believe that the event you just experienced was predictable, even though it really wasn’t. In other words, you knew all along that things would turn out the way they did. Can you relate this to the phrase "Hindsight is 20/20" now? 
3.9K
Framing Effects03:26

Framing Effects

7.5K
Information is everywhere and its presentation—such as how and when items are presented—can impact our perceptions and decisions surrounding the info. This broad concept umbrellas framing effects—influences that occur due to the way information is framed in its appearance, whether it’s purely the order or the specific wording of a message. Let’s take a look at numerous ways in which two versions of something can objectively say the same thing, yet we respond in...
7.5K
Forgetting01:21

Forgetting

134
Forgetting is an intrinsic aspect of human memory, characterized by the gradual loss or inaccessibility of information over time. Hermann Ebbinghaus, a pioneering psychologist, extensively studied this phenomenon and formulated the forgetting curve. This curve illustrates that memory loss occurs rapidly immediately after learning and then decelerates over time. Several mechanisms contribute to forgetting, including encoding failure, storage decay, retrieval failure, and interference.
Encoding...
134

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相关实验视频

Updated: Sep 17, 2025

Assessing the Particulate Matter Removal Abilities of Tree Leaves
05:07

Assessing the Particulate Matter Removal Abilities of Tree Leaves

Published on: October 7, 2018

6.9K

在后面留下

Jon Cohen1

  • 1This story is part of a series about the impacts of U.S. funding cuts on global health, supported by the Pulitzer Center.

Science (New York, N.Y.)
|July 3, 2025
PubMed
概括
此摘要是机器生成的。

美国预算削减危及莱索托和埃斯瓦提尼的艾滋病进展. 多年来对抗人类免疫缺陷病毒 (HIV) 的进展由于资金减少而面临风险.

科学领域:

  • 公共卫生
  • 国际关系
  • 流行病学

背景情况:

  • 美国预算削减对非洲南部的艾滋病毒/艾滋病项目构成重大威胁.
  • 在抗击人类免疫缺陷病毒 (HIV) 流行病方面取得多年的进展受到威胁.

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