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関連する概念動画

Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

3.2K
An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
3.2K
Forced Oscillations01:06

Forced Oscillations

8.0K
When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
8.0K
Damped Oscillations01:07

Damped Oscillations

7.3K
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
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Limits with Oscillating Discontinuities01:19

Limits with Oscillating Discontinuities

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An oscillating discontinuity is a type of discontinuity in which a function’s values fluctuate infinitely often as the input approaches a particular point. Unlike jump discontinuities, where the function suddenly shifts between two values, or infinite discontinuities, where the function diverges without bound, an oscillating discontinuity arises from rapid back-and-forth variation. Because the function never stabilizes toward a single value, no finite limit exists at that point.One of the...
486
Oscillations about an Equilibrium Position01:04

Oscillations about an Equilibrium Position

7.0K
Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
7.0K
Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

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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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Updated: Feb 12, 2026

Author Spotlight: In Vitro Investigations of Circadian Rhythms in Multicellular Systems
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1つの細胞に2つの日間振動器

Till Roenneberg, David Morse

    Nature
    |April 11, 2018
    PubMed
    まとめ
    この要約は機械生成です。

    この研究は,生物学的時計 (日中リズム) が独立して動作することを明らかにしています. この発見は 生物の毎日のリズムを 制御する単一の昼夜メカニズムという 長い間信じられてきた信念に 異議を唱えるものです

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    In Vitro Bioluminescence Assay to Characterize Circadian Rhythm in Mammary Epithelial Cells
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    In Vitro Bioluminescence Assay to Characterize Circadian Rhythm in Mammary Epithelial Cells

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    関連する実験動画

    Last Updated: Feb 12, 2026

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    A Computational Method to Quantify Fly Circadian Activity
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    科学分野:

    • クロノバイオロジー
    • 分子生物学
    • 細胞生物学

    背景:

    • シルカディアン時計は,ほとんどの真核生物といくつかの原核生物に存在する至るところに存在する生物学的振動器です.
    • これらの時計は 光合成と睡眠と覚醒のサイクルを含む 様々な日々のリズムを調節し 生物が環境の変化を予期できるようにします
    • 以前は,進化的に保存された単一のメカニズムがすべての昼夜機能の基礎であると広く考えられていた.

    研究 の 目的:

    • 生物体内の複数の昼夜リズムが単一の振動器または異なる振動器によって制御されているかどうかを調査する.
    • 統一された生理時時計の仮説に 異議を唱えるために

    主な方法:

    • この研究では,単細胞生物を用いて,その昼夜リズムを制御された実験条件下で観察した.
    • 異なるリズムプロセスの独立性を評価するために実験的操作が行われました.

    主要な成果:

    • 単細胞生物内の2つの異なる昼夜リズムが,特定の実験条件下で独立して動いていることが観察されました.
    • この独立性は,これらのリズムが単一の概括的な昼夜振動器によって支配されないことを示唆している.

    結論:

    • これらの発見は,単一の生物体内で異なる昼夜リズムを制御する複数の異なる振動器の存在を証明しています.
    • これは,単一の,統一された昼間時計のメカニズムというパラダイムに挑戦し,昼間時計の調節を理解するための新しい道を開きます.