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相关概念视频

Biological Clocks and Seasonal Responses02:45

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The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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Circadian Rhythms and Gene Regulation02:19

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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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Language and Cognition

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Language serves as a bridge between ideas and communication, influencing how individuals perceive and interact with the world. Psychologists have long debated whether language shapes thought or vice versa. This discussion gained grip with Edward Sapir and Benjamin Lee Whorf in the 1940s, who proposed that language determines thought, a concept known as linguistic determinism. They suggested that the vocabulary and structure of a language influence how its speakers think and perceive reality.
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Somnambulism, commonly known as sleepwalking, involves individuals engaging in activities ranging from simple walking to more complex behaviors such as driving. Sleepwalking typically occurs during the slow-wave sleep stages 3 and 4 early in the night when the person is not dreaming, contradicting the myth that sleepwalkers are acting out their dreams.
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Lateralization

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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
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相关实验视频

Updated: Jul 26, 2025

Human Circadian Phenotyping and Diurnal Performance Testing in the Real World
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时钟说话:我们是否忘记了地理差异?

William E Bradshaw1, Margaret C Fletcher2, Christina M Holzapfel2

  • 1Laboratory of Evolutionary Genetics, Institute of Ecology and Evolution, University of Oregon, Eugene, OR, 97403-5289, USA. mosquito@uoregon.edu.

Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology
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PubMed
概括

盆栽蚊子 (Wyeomyia smithii) 显示了对季节变化的进化适应,关键光周期增加和生理时钟参与减少. 这种微观进化差异为更广泛的生物时间进化提供了洞察力.

关键词:
进化 进化 进化 进化 进化 进化 进化遗传相关性 遗传相关性微观进化和宏观进化是不同的.摄影周期主义 (Photoperiodism) 是一种摄影周期主义.植物地理学 植物地理学种类多样化 种类多样化

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科学领域:

  • 进化生物学 进化生物学
  • 时间生物学 时间生物学
  • 遗传学 遗传学 是一个

背景情况:

  • 威奥米亚·斯密希 (Wyeomyia smithii) 是一种种植的蚊子,在北美东部地区表现出不同的地理位置.
  • 种群已经适应了度和海拔梯度,这表明对环境线索的进化反应.

研究的目的:

  • 为了研究Wyeomyia smithii种群中光周期和昼夜时钟参与的进化变化.
  • 了解微观进化差异在生物时间表中的遗传基础.

主要方法:

  • 对跨季节梯度的Wyeomyia smithii种群的分析.
  • 对光周期的昼夜基础进行实验测试.
  • 检查基因架构的基础的进化过程.

主要成果:

  • 随着季节性梯度的增加,临界光周期增加了.
  • 显而易见的昼夜时钟参与度随着人口的分歧而下降.
  • 光周期反应的变化存在于种群内和种群之间.

结论:

  • 在Wyeomyia smithii中微演变过程表明适应季节变化.
  • 这些发现说明了生物定时机制中宏观进化分歧的途径.
  • 复杂的遗传架构影响了生物系统中的时间演变.