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関連する概念動画

Plant Cell Wall02:43

Plant Cell Wall

60.3K
The plant cell wall gives plant cells shape, support, and protection. As a cell matures, its cell wall specializes according to the cell type. For example, the parenchyma cells of leaves possess only a thin, primary cell wall.
60.3K
Plant Cell Wall01:07

Plant Cell Wall

7.6K
Plant cells have a cell wall, a rigid outer covering that protects the cell and provides shape and support. During cell division, a mixture of enzymes, proteins, and glucose molecules is transported via vesicles to the center of the cell. These vesicles continuously fuse and build a cell plate between the dividing cells. As the cell plate matures, new polysaccharides are added to it to form the cell walls of the daughter cells. The predominant polysaccharide in the cell wall is cellulose, made...
7.6K
Bacterial Cell Wall01:22

Bacterial Cell Wall

2.6K
The bacterial cell wall is an essential structural component that encases the plasma membrane, preserving cellular integrity, determining shape, and protecting against osmotic stress. This rigid yet flexible structure primarily comprises peptidoglycan, a polymer that forms a mesh-like matrix conferring mechanical strength and flexibility.Peptidoglycan Composition and StructurePeptidoglycan, the core of the bacterial cell wall, comprises alternating units of N-acetylglucosamine (NAG) and...
2.6K
Archaeal Cell Wall01:29

Archaeal Cell Wall

1.1K
Archaeal cell walls are structurally and compositionally distinct from their bacterial counterparts, lacking the characteristic peptidoglycan layer found in most bacteria. Instead, archaeal cell walls exhibit remarkable diversity, utilizing materials such as pseudomurein, polysaccharides, and proteins to construct their protective outer layers. This structural flexibility is closely tied to archaea's ecological adaptability.S-Layers: The Common Archaeal Cell WallThe S-layer is the most...
1.1K
Phase Diagrams02:39

Phase Diagrams

50.1K
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
50.1K
Role of Microtubules in Cell Wall Deposition01:02

Role of Microtubules in Cell Wall Deposition

3.1K
Microtubules are small hollow tubes in eukaryotic cells. The cell wall microtubules are polymerized dimers of two globular proteins, α-tubulin and β-tubulin, two globular proteins. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton. They help the cell resist compression and provide a track along which vesicles move through the cell or pull replicated chromosomes to opposite ends of a dividing cell. Microtubules go through quick cycles of...
3.1K

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関連する実験動画

Updated: Jan 29, 2026

Cell Co-culture Patterning Using Aqueous Two-phase Systems
10:11

Cell Co-culture Patterning Using Aqueous Two-phase Systems

Published on: March 26, 2013

19.2K

ポリンの細胞壁のパターンは,調節された段階から形成される

Asja Radja1, Eric M Horsley1, Maxim O Lavrentovich2

  • 1Department of Physics and Astronomy, University of Pennsylvania, 209 S. 33(rd) Street, Philadelphia, PA 19104, USA.

Cell
|February 9, 2019
PubMed
まとめ
この要約は機械生成です。

花粉の粒子のパターンは 段階分離と呼ばれる生体物理的プロセスから生まれます ほとんどの種は不正確なパターンを形成しますが,少数の種は同一で再現可能な花粉粒を作り出します.

キーワード:
生体物理学細胞膜細胞壁エキシンパターン形成段階移行花粉プレムキシン自己組み立て空間的に調節されたフェーズ

さらに関連する動画

Glycan Profiling of Plant Cell Wall Polymers using Microarrays
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Glycan Profiling of Plant Cell Wall Polymers using Microarrays

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

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関連する実験動画

Last Updated: Jan 29, 2026

Cell Co-culture Patterning Using Aqueous Two-phase Systems
10:11

Cell Co-culture Patterning Using Aqueous Two-phase Systems

Published on: March 26, 2013

19.2K
Glycan Profiling of Plant Cell Wall Polymers using Microarrays
12:30

Glycan Profiling of Plant Cell Wall Polymers using Microarrays

Published on: December 17, 2012

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

10.4K

科学分野:

  • バイオ物理学
  • 発達生物学
  • 進化生物学

背景:

  • 花粉の表面パターンは 驚くべき幾何学的な多様性を表しています
  • この多様性の背後にある発達メカニズムは まだ十分に理解されていません
  • これらのパターンを理解することで 他の生物学的構造の洞察が得られます

研究 の 目的:

  • 花粉エキシンの形成を制御する生体物理的原理を明らかにする.
  • ポリサッカライド層の相分離プロセスをモデル化します.
  • パターン開発の進化的影響を調査する.

主な方法:

  • 多糖層の相分離をシミュレートする生体物理モデルの開発.
  • 生きた植物細胞におけるパターン発達の実験観察.
  • 植物種間のパターン多様性の比較分析

主要な成果:

  • 生物物理モデルでは 花粉の粒子の幾何学的なパターンの多様性を正確に再現します
  • 花粉のエクシンパターンは,細胞外ポリサッカリド層の相分離から生じる.
  • 約10%の種は 均等な花粉粒を産み出し,90%の種は不完全な複製を産み出し 発育を止めます
  • 均衡パターンは何度も進化しましたが 選択によって好まれていません

結論:

  • 花粉のエクシンパターンの多様性は,相分離メカニズムによって説明されます.
  • 均衡状態ではなく 発達停止がほとんどの種で 支配的な状態です
  • このモデルは,他の分泌生物学的構造を理解するための枠組みを提供します.
  • 進化は完璧に 複製可能なパターンを 選択しません