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相关概念视频

Hindsight Biases01:12

Hindsight Biases

3.4K
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? 
3.4K
Replicative Cell Senescence02:15

Replicative Cell Senescence

3.6K
Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
3.6K
Reflection of Waves01:07

Reflection of Waves

3.6K
When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
3.6K
Longitudinal Research02:20

Longitudinal Research

11.8K
Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
11.8K
Long-term Depression01:03

Long-term Depression

2.4K
Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
If over...
2.4K
Half-life of a Reaction02:42

Half-life of a Reaction

33.7K
The half-life of a reaction (t1/2) is the time required for one-half of a given amount of reactant to be consumed. In each succeeding half-life, half of the remaining concentration of the reactant is consumed. For example, during the decomposition of hydrogen peroxide, during the first half-life (from 0.00 hours to 6.00 hours), the concentration of H2O2 decreases from 1.000 M to 0.500 M. During the second half-life (from 6.00 hours to 12.00 hours), the concentration decreases from 0.500 M to...
33.7K

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相关实验视频

Updated: May 10, 2025

Single Wavelength Shadow Imaging of Caenorhabditis elegans Locomotion Including Force Estimates
08:41

Single Wavelength Shadow Imaging of Caenorhabditis elegans Locomotion Including Force Estimates

Published on: April 18, 2014

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一个50年的影子

Jyoti Madhusoodanan

    Science (New York, N.Y.)
    |April 24, 2025
    PubMed
    概括

    研究人员研究越南战争对在冲突期间青少年的长期影响. 这项研究探讨了战时经历对成年人的长期影响.

    科学领域:

    • 心理学
    • 社会学
    • 历史

    背景情况:

    • 越南战争对个人和社会产生了深远而持久的影响.
    • 了解战时经历的长期心理和社会后果至关重要.

    研究的目的:

    • 调查越南战争对青少年的持续影响.
    • 分析青少年接触冲突如何影响长期生活成果和福祉.

    主要方法:

    • 纵向研究设计.
    • 质量和数量数据收集方法.
    • 对心理,社会和经济影响的分析.

    主要成果:

    • 确定特定的长期心理后果.
    • 战争时期的经历与后来的生活挑战之间的关联.
    • 了解青春期发展起来的性和应对机制.

    结论:

    • 在越南战争期间的青少年经历显著影响了长期的生活轨迹.
    • 这项研究强调了对战争幸存者的持续支持的迫切需要.
    • 这些发现有助于更深入地了解冲突后人口的创伤和性.

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    Single Wavelength Shadow Imaging of Caenorhabditis elegans Locomotion Including Force Estimates

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