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Bacterial Signaling01:30

Bacterial Signaling

Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
Chemotaxis and Direction of Cell Migration01:21

Chemotaxis and Direction of Cell Migration

Cells can detect chemical cues in their environment and reorganize the cytoskeleton to migrate toward them or away from them. This directional migration, called chemotaxis, is essential during embryogenesis and development, immune response, tissue repair and regeneration, and reproduction. These chemical cues can either attract or repel the cell's movement. For example, axon development is determined by a combination of chemoattractants and chemorepellents that direct the growing axon towards...
Flagella and Motility in Bacteria01:18

Flagella and Motility in Bacteria

Flagella are specialized, thread-like structures that extend from a bacteria's cell envelope. They play a crucial role in motility and chemotaxis. Their structural organization and functioning exemplify sophisticated biological engineering, enabling bacterial survival and adaptability in diverse environments.Structure of the FlagellumA bacterial flagellum consists of three key components: the filament, the hook, and basal body. The filament, a long, helical structure composed of repeating...
Chemotaxis in E. coli01:27

Chemotaxis in E. coli

Chemotaxis in Escherichia coli is a sensory-driven motility mechanism that enables bacteria to navigate chemical gradients, moving toward beneficial environments while avoiding harmful conditions. This process relies on a signal transduction system integrating external chemical cues with flagellar motor control.Chemoreceptors and Signal DetectionE. coli detects chemical gradients through methyl-accepting chemotaxis proteins (MCPs), which are membrane-bound chemoreceptors that sense attractants...
Stringent Response in E. coli01:23

Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
Other Stress Responses in Bacteria01:30

Other Stress Responses in Bacteria

Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...

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Updated: Jun 17, 2026

A Microfluidic Device for Quantifying Bacterial Chemotaxis in Stable Concentration Gradients
09:28

A Microfluidic Device for Quantifying Bacterial Chemotaxis in Stable Concentration Gradients

Published on: April 20, 2010

バクテリアの化学反応における衝動反応

S M Block, J E Segall, H C Berg

    Cell
    |November 1, 1982
    PubMed
    まとめ
    この要約は機械生成です。

    Escherichia coliの化学毒化は,数秒間にわたって化学信号を統合することを意味します. このバクテリア感知システムは,化学的梯度におけるナビゲーションに不可欠な濃度変化を検出するために最適化されています.

    さらに関連する動画

    Assessment of Dictyostelium discoideum Response to Acute Mechanical Stimulation
    10:40

    Assessment of Dictyostelium discoideum Response to Acute Mechanical Stimulation

    Published on: November 9, 2017

    Generating Controlled, Dynamic Chemical Landscapes to Study Microbial Behavior
    10:07

    Generating Controlled, Dynamic Chemical Landscapes to Study Microbial Behavior

    Published on: January 31, 2020

    関連する実験動画

    Last Updated: Jun 17, 2026

    A Microfluidic Device for Quantifying Bacterial Chemotaxis in Stable Concentration Gradients
    09:28

    A Microfluidic Device for Quantifying Bacterial Chemotaxis in Stable Concentration Gradients

    Published on: April 20, 2010

    Assessment of Dictyostelium discoideum Response to Acute Mechanical Stimulation
    10:40

    Assessment of Dictyostelium discoideum Response to Acute Mechanical Stimulation

    Published on: November 9, 2017

    Generating Controlled, Dynamic Chemical Landscapes to Study Microbial Behavior
    10:07

    Generating Controlled, Dynamic Chemical Landscapes to Study Microbial Behavior

    Published on: January 31, 2020

    科学分野:

    • 微生物学 微生物学とは
    • 細胞生物学 細胞生物学
    • バイオフィジックス 生物物理学

    背景:

    • エシェリキア・コライ (E. coli) は,化学的刺激に反応する方向的な動きであるケモタクシスを表します.
    • セルラーナビゲーションは,時間の経過とともに感覚情報を統合することで,環境のグラデーションに効果的に反応します.

    研究 の 目的:

    • イオンフォレート化学的配送を用いたE. coliの化学毒性の時間的動態を調査する.
    • バクテリアの化学作用の基礎となる感覚統合と適応メカニズムを解明する.

    主な方法:

    • 縛られたE. coliの細胞は,イオントフォレシス経由で短い化学パルスに曝された.
    • フラゲラ回転 (時計回りの方向と逆方向) と応答タイミングを分析した.

    主要な成果:

    • E. coliの細胞は数秒間にわたって化学信号を統合し,吸引剤と排斥剤に対する二相反応を示します.
    • センサーシステムは,約2秒間にわたって発生する濃度変化のための最適なチューニングを示しています.
    • メチル化欠陥を持つ変異体は部分的な適応欠陥を示し,cheZ変異体は異常な興奮反応を示した.

    結論:

    • E. coliの化学反応は,化学信号の時間的統合と微分を伴う.
    • バクテリアの感覚システムは,自然環境における関連する濃度変化を検出するために微調整されています.
    • メチル化とCheZタンパク質は,E. coliの化学的適応と刺激において重要な役割を果たします.