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Centrifugation01:05

Centrifugation

2.4K
Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
2.4K
Subcellular Fractionation01:32

Subcellular Fractionation

7.1K
The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation.
Differential Centrifugation
Differential centrifugation is...
7.1K
Overview Of Cell Separation And Isolation01:20

Overview Of Cell Separation And Isolation

5.9K
Cell separation was first achieved in 1964 by S. H. Seal, who separated large tumor cells from the smaller blood cells using filtration. Two years later, Pohl and Hawk performed experiments on how cells respond differently to a nonuniform electric field based on the cell type. Such observations were the inception of cell separation methods, which allow isolating a single cell type from a heterogeneous sample.
5.9K

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Author Spotlight: Investigating the Motion Dynamics of the Eukaryotic Replisome Components at the Single-Molecule Level
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単分子遠心分離による分子異質性の解消

Yi Luo1,2,3, Jeffrey Chang4, Darren Yang1,2,3

  • 1Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, Massachusetts 02115, United States.

Journal of the American Chemical Society
|January 30, 2023
PubMed
まとめ

研究者はDNAナノスイッチと遠心分離力顕微鏡を用いた新しい方法を開発し,生物分子異質性を分析した. このアプローチは,ポリクローン抗体内の3つの異なるサブ集団を成功裏に特定し,分子多様性に関する理解を深めました.

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A Combinatorial Single-cell Approach to Characterize the Molecular and Immunophenotypic Heterogeneity of Human Stem and Progenitor Populations
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A Combinatorial Single-cell Approach to Characterize the Molecular and Immunophenotypic Heterogeneity of Human Stem and Progenitor Populations

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Cell Fractionation of U937 Cells in the Absence of High-speed Centrifugation
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Cell Fractionation of U937 Cells in the Absence of High-speed Centrifugation

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A Combinatorial Single-cell Approach to Characterize the Molecular and Immunophenotypic Heterogeneity of Human Stem and Progenitor Populations
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科学分野:

  • バイオ物理学
  • 分子生物学
  • 分析化学

背景:

  • 集団レベルの異質性は,抗体やタンパク質を含むバイオ分子機能にとって極めて重要です.
  • この異質性を特徴付けるのは,単一分子分析と堅固な統計的枠組みの必要性のために困難です.
  • 既存のアンサンブル方法では 重要な分子の変動を平均します

研究 の 目的:

  • 単一分子レベルで生物分子異質性を特徴付けるための新しいアプローチを開発し,検証する.
  • 集計平均の限界を克服し,騒々しく限られたデータセットを分析します.
  • 複雑な生物学的サンプル内の独特の運動特性を有する異なる亜集団を解析する.

主な方法:

  • DNAナノスイッチ構造を用いて 個々の分子を繰り返し探査した.
  • 高通量並列データ取得のためのベンチ上の遠心分離力顕微鏡 (CFM) を採用した.
  • 統計分析とサブポピュレーション解像度のためのベイジアン非パラメトリック (BNP) 推論を適用した.

主要な成果:

  • 統合ナノスイッチ-CFMとBNPのアプローチを使用して,商業的に利用可能な抗体を成功裏に特徴付けました.
  • 3つの異なるサブ集団の混合体としてモデル化できることを示した.
  • 異質なサンプルにおける複雑な生物分子相互作用の解消における結合技術の有効性を検証した.

結論:

  • 統合されたナノスイッチ-CFM測定法とBNP分析は,生物分子異質性を研究するための強力なツールを提供します.
  • この方法は,単一分子分析における重要な課題を克服し,分子サブ集団の詳細な特徴を可能にします.
  • この発見は,抗体機能における異質性の重要性を強調し,より深い生物学的洞察への道を示しています.