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Related Concept Videos

Polymers02:34

Polymers

41.7K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Biosynthesis of Lipids01:29

Biosynthesis of Lipids

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Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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What are Lipids?01:38

What are Lipids?

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Overview
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Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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Assembly of the Lipid Bilayer in the ER01:28

Assembly of the Lipid Bilayer in the ER

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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...
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Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes
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Polymerization from Lipid Membranes.

Alexandre L Torzynski1, Dominique Grimm1, Matteo Romio2,3

  • 1Laboratory of Soft and Living Materials, Department of Materials, ETH Zurich, Zürich 8093, Switzerland.

Biomacromolecules
|February 20, 2026
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Summary
This summary is machine-generated.

Researchers developed a novel method to grow dense polymer brushes from lipid membranes using lipid-initiated polymerization. This technique creates functionalized membranes with potential for biomedical applications and biophysical studies.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Membrane Biophysics

Background:

  • Lipid bilayer membranes are crucial in biological systems.
  • Asymmetric functionalization of membranes with macromolecules is desirable for advanced applications.
  • Existing methods for polymer brush growth on membranes have limitations.

Purpose of the Study:

  • To develop a method for growing thick and dense polymer brushes from one side of lipid membranes.
  • To demonstrate the versatility of this approach on different lipid vesicle types.
  • To investigate the structural transformations induced by polymer brush growth.

Main Methods:

  • Incorporation of a novel lipid-based initiator into lipid bilayers.
  • Aqueous atom transfer radical polymerization (ATRP) for polymer brush growth.
  • Quartz crystal microbalance with dissipation monitoring (QCM-D) and dynamic light scattering (DLS) for characterization.

Main Results:

  • Successful growth of poly(N-isopropylacrylamide) (PNIPAM) brushes up to 70 nm thick.
  • Demonstrated growth from supported lipid bilayers (SLBs), small unilamellar vesicles (SUVs), and giant unilamellar vesicles (GUVs).
  • Observed spontaneous transformation of GUVs into "strings of pearls" structures.

Conclusions:

  • Lipid membrane-initiated polymerization is an effective strategy for creating asymmetrically functionalized membranes.
  • The method offers tunable brush thickness and unique structural outcomes.
  • This approach has potential for enhancing biomedical devices and creating in vitro models for membrane biophysics.