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Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

2.4K
Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
2.4K
Spindle Assembly02:50

Spindle Assembly

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Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a...
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Centrioles and Centrosomes01:13

Centrioles and Centrosomes

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Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
Near the end of the prophase, also called late prophase or...
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Microtubule Formation01:23

Microtubule Formation

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Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation...
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Microtubules in Cell Motility01:24

Microtubules in Cell Motility

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Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...
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Microtubule Associated Motor Proteins01:32

Microtubule Associated Motor Proteins

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Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular...
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Updated: Jan 17, 2026

Assembly of Complex Microtubule Structures
01:32

Assembly of Complex Microtubule Structures

2.4K

地球のマントルです.

G R Helffrich1, B J Wood

  • 1Earth and Planetary Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-Ku, Tokyo 152-8551, Japan. george@geology.bristol.ac.uk

Nature
|August 3, 2001
PubMed
まとめ
この要約は機械生成です。

地震と地化学のデータは,マントル全体のコンベクションを示唆し,層状マントルモデルに挑戦しています. 潜水した地殻物質は,観測されたマントルの異質性を説明し,深層の物質循環を示している.

さらに関連する動画

Spindle assembly: Dynein, Kinesin and Microtubules
02:50

Spindle assembly: Dynein, Kinesin and Microtubules

4.2K
Centrioles and Centrosomes
01:13

Centrioles and Centrosomes

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関連する実験動画

Last Updated: Jan 17, 2026

Assembly of Complex Microtubule Structures
01:32

Assembly of Complex Microtubule Structures

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Spindle assembly: Dynein, Kinesin and Microtubules
02:50

Spindle assembly: Dynein, Kinesin and Microtubules

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Centrioles and Centrosomes
01:13

Centrioles and Centrosomes

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科学分野:

  • 地質物理学 地質物理学とは地質物理学です.
  • 地質化学 地質化学
  • ミネラル物理学 ミネラル物理学

背景:

  • 地震観測は,地球のマントルの410km,660km,2700kmの異なる速度構造を明らかにしています.
  • 2700kmの"D"層は,化学的,熱的変化を表している可能性が高いが,浅い断続は鉱物相変換を示唆している.
  • 潜水した物質は深層マントルに浸透し,マントル全体のコンベクションを暗示しているように見えますが,地化学データはしばしば層状のマントルを示唆しています.

研究 の 目的:

  • マントルのコンベクションに関する地震学的および地化学的証拠を調和させる.
  • 深層マントルの構造における沈下した地殻物質の役割を調査する.
  • 全マントルのコンベクションが,利用可能なすべての地球物理学的および地球化学的データと一致するかどうかを判断する.

主な方法:

  • 地震学的画像の分析,トモグラフィックデータと不連続性の移動を含む.
  • ベースルティックマントルの融解産物の地化学分析の検討.
  • 熱流データと地震学および地化学的発見の統合.

主要な成果:

  • 地震学的なデータは,沈殿した物質が深層マントルに浸透し,マントル全体のコンベクションを支えていることを示しています.
  • 地化学的なデータは,層層のマントルシステムを示唆するように解釈されています.
  • この研究は,全マントルのコンベクションモデルの下で,地化学的,地震学的,熱流量データの一貫性を示しています.

結論:

  • 全マントルのコンベクションは,統合された地球物理学的および地球化学的データによってサポートされています.
  • 観測されたマントルの異質性は,リサイクルされた海洋と大陸の地殻に起因する.
  • リサイクルされた地殻物質は,マントルの体積の約16% (海洋) と0.3% (大陸) を占めています.