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関連する概念動画

Gyroscope01:02

Gyroscope

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A gyroscope is defined as a spinning disk in which the axis of rotation is free to assume any orientation. When spinning, the orientation of the spin axis is unaffected by the orientation of the body that encloses it. The body or vehicle enclosing the gyroscope can be moved from place to place, while the orientation of the spin axis remains the same. This makes gyroscopes very useful in navigation, especially where magnetic compasses cannot be used, such as in crewed and crewless spacecraft,...
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Gyroscope: Precession01:24

Gyroscope: Precession

4.8K
Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
4.8K
Center of Gravity00:58

Center of Gravity

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The center of gravity (COG) of an object is the point where the object's total weight is considered to be concentrated. Knowing the location of the center of gravity is useful when predicting the behavior of a moving object or designing static structures. In a uniform gravitational field, the center of gravity is similar to the center of mass (COM); yet, these two points can be positioned differently. For example, the Moon's center of mass lies very close to its geometric center, but...
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Center of Gravity01:15

Center of Gravity

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The center of gravity is the point at which an object's weight appears to be concentrated and can be used to balance the object perfectly. This point is essential in mechanics as it provides information regarding a body's stability and moments of inertia. The center of gravity does not always have to fall within the shape or boundaries of the body; it may also lie outside the body in certain cases.
To determine its location, the principle of moments can be utilized by dividing the object into...
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Rotation of Asymmetric Top01:11

Rotation of Asymmetric Top

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By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
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Rotational Motion about a Fixed Axis01:26

Rotational Motion about a Fixed Axis

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A rigid body's rotation around a fixed axis makes every point within it trace a circular path around a specific line or point. The term given to this type of spinning is defined by the angular position, symbolized by the angle θ. This angle is gauged from a static reference line to the revolving object. From this angular position, any variation is referred to as angular displacement, denoted by dθ. The extent of this displacement can be calculated in degrees, radians, or...
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関連する実験動画

Updated: May 3, 2026

Method to Measure Tone of Axial and Proximal Muscle
10:41

Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

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セントロメアに正のスピンがある.

Mekonnen Lemma Dechassa1, Sheena D'Arcy, Karolin Luger

  • 1Howard Hughes Medical Institute, Colorado State University, Fort Collins CO 80523-1870, USA.

Cell
|July 15, 2009
PubMed
まとめ
この要約は機械生成です。

染色体分離に不可欠なセントロメリックヌクレオソームは,独特のDNA包装を示しています. フルヤマとヘニコフ (2009) は,このDNA包装が正規の核分裂体とは正反対であることを明らかにし,既存のモデルに挑戦しています.

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科学分野:

  • 分子生物学は分子生物学である.
  • エピジェネティクス エピジェネティクス
  • クロマチンの構造 クロマチンの構造

背景:

  • セントロメリックヌクレオソームは,染色体分離と安定性において重要な役割を果たします.
  • セントロメリック核細胞体の正確な構造的,機能的性質は,まだ完全に理解されていません.
  • DNA包装の基本単位であるカノニカルヌクレオソームは,明確に定義されたDNA包装の方向性を有しています.

研究 の 目的:

  • セントロメリックヌクレオソームのDNA包み方位を調査するために.
  • セントロメリックヌクレオソームの構造特性をめぐる論争を解決するために.

主な方法:

  • ニュクレオソームの構造を分析するために生体物理学的技術を活用した (具体的方法は概要に詳述されていません).
  • セントロメリックヌクレオソームのDNA包みとカノンカルヌクレオソームを比較した.

主要な成果:

  • セントロメリックヌクレオソームが,正規のヌクレオソームと正反対の方向でDNAを包むという証拠を提示した.
  • この発見は,センターメリックヌクレオソーム構造の確立された理解に挑戦しています.

結論:

  • セントロメア核細胞のユニークなDNA包装は,セントロメアアイデンティティと機能におけるそれらの特殊な機能に寄与する可能性があります.
  • この代替的なDNA包装の方向性の機能的影響を明らかにするために,さらなる研究が必要である.