複雑な液体のコロイド的性質は,細菌の運動性を高める

Shashank Kamdar¹, Seunghwan Shin¹, Premkumar Leishangthem²

¹Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN, USA.

Nature

|March 31, 2022

まとめ

コロイドのような複雑な液体の細菌の運動性は,ポリマー溶液と同様に粒子の大きさによって強化されます. ポリマーダイナミクスは観察された細菌の動きの強化に欠かせないことを示しています

科学分野:

微生物学
流体力学
柔らかい物質の物理

背景:

微生物はコロイドとマクロ分子に富んだ環境に住み,ニュートン式でない流体特性を表している.
複雑な液体における細菌の移動は十分に理解されていないが,ポリマー溶液における運動性増強メカニズムについては議論が続いている.

研究の目的:

ポリマー溶液における細菌の運動性を調査し,ポリマー溶液における行動と比較する.
細菌の運動性増強における流体特性,特にコロイド対ポリマーダイナミクスの役割を明確にする.

主な方法:

粒子の大きさや体積分数によって異なる稀なコロイドスペンションで鞭打ちされた細菌を用いた実験.
細菌の運動行動の定量分析,運動能力の強化と揺れ抑制を含む.
コロイド相互作用を含む物理モデルの開発.

主要な成果:

ポリマー溶液に類似した,フラゲル化された細菌は,粒子の大きさに依存して,80パーセントまでの運動能力の強化を示します.
バクテリアの振動は,コロイドサスペンションで著しく抑制されます.
硬球コロイドに基づく物理モデルは,コロイドとポリマー流体の両方の運動性と振動動性を正確に予測します.

結論:

複雑な液体における細菌の運動性の強化は,コロイド相互作用によって説明され,ポリマーダイナミクスが唯一の要因ではないことを示唆する.
この発見は様々な複雑な環境で細菌の泳ぎ方についての統一された理解を提供します
この研究は,微生物学的過程を理解し,細菌の運動性を工学化するための意味を持っています.

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