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Related Concept Videos

Fluid Mosaic Model01:19

Fluid Mosaic Model

Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich with the analogy of...
Fluid Mosaic Model01:34

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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.LipidsThe most...

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Related Experiment Video

Updated: Jun 5, 2026

Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions
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Interaction of cationic liposomes with cell membrane models.

Maria Grazia Bonicelli1, Luisa Giansanti, Marco Ierino

  • 1Dipartimento di Ingegneria Chimica, dei Materiali, delle Materie Prime e dell'Ambiente, Università degli Studi di Roma Sapienza, P.le A. Moro 5, 00185 Roma, Italy.

Journal of Colloid and Interface Science
|December 31, 2010
PubMed
Summary

Investigating phosphatidylcholine liposomes with cationic liposomes revealed that minor formulation changes significantly impact lipid interactions. These findings correlate with prior biological evaluations, highlighting formulation sensitivity in liposome behavior.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Biophysics

Background:

  • Phosphatidylcholine liposomes serve as crucial cell membrane models.
  • Cationic liposomes are widely used in drug delivery and gene transfection.
  • Understanding liposome interactions is vital for optimizing their biological applications.

Purpose of the Study:

  • To investigate the interaction between phosphatidylcholine liposomes and specifically formulated cationic liposomes.
  • To determine how variations in cationic liposome composition affect lipid interactions.
  • To correlate physicochemical findings with previous biological evaluation data.

Main Methods:

  • Differential scanning calorimetry (DSC) was employed to analyze thermal properties and phase transitions.
  • Fluorescence resonance energy transfer (FRET) experiments were used to study lipid mixing and membrane dynamics.
  • Cationic liposomes were formulated with 1,2-dimyristoyl-sn-glycero-3-phosphatidylcholine and pyrrolidinium-based amphiphiles.

Main Results:

  • Subtle alterations in the cationic liposome formulation led to significant changes in lipid interactions.
  • DSC and FRET data demonstrated sensitivity of liposome behavior to formulation.
  • The observed lipid interactions were consistent with previous biological assessments.

Conclusions:

  • Formulation of cationic liposomes critically influences their interaction with phosphatidylcholine liposomes.
  • Physicochemical characterization provides insights into the biological performance of liposomes.
  • Precise control over liposome formulation is essential for predictable biological outcomes.