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A motor unit consists of two main components: a single efferent motor neuron (i.e., a neuron that carries impulses away from the central nervous system) and all of the muscle fibers it innervates. The motor neuron may innervate multiple muscle fibers, which are single cells, but only one motor neuron innervates a single muscle fiber.
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Related Experiment Video

Updated: Aug 7, 2025

On-Chip Octanol-Assisted Liposome Assembly for Bioengineering
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Enzymatic Janus Liposome Micromotors.

Hui Jin1, Jinyan Cui1, Wei Zhan1

  • 1Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 9, 2023
PubMed
Summary

Researchers developed a liposome-based micromotor system for directional motion in water. These enzyme-decorated Janus liposomes move efficiently using enzymatic reactions and gas generation.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Biophysics

Background:

  • Designing artificial micro- and nanomotors for directed movement in aqueous environments is a significant challenge.
  • Lipid self-assembly offers a versatile platform for creating complex structures with tailored properties.
  • Achieving controlled motion often requires asymmetry and localized functionality.

Purpose of the Study:

  • To present a novel liposome-based micromotor system capable of autonomous directional motion.
  • To demonstrate the use of enzymatic reactions and gas generation for propulsion.
  • To investigate the role of Janus configuration and asymmetry in achieving directed movement.

Main Methods:

  • Fabrication of Janus liposomes using a mixture of low-melting and high-melting lipids with cholesterol, exploiting lipid liquid-liquid phase separation for stable asymmetry.

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  • Site-specific enzyme immobilization (horseradish peroxidase) onto one domain of the Janus liposomes via avidin-biotin affinity binding.
  • Characterization of liposome motion in the presence of hydrogen peroxide substrate, analyzing factors like substrate concentration and Janus ratio.

    • Main Results:

    • The enzyme-decorated Janus liposomes exhibited directional motion in water, propelled by localized enzymatic conversion and gas generation.
    • Observed velocities were significantly higher than Brownian motion, in some cases exceeding it by threefold.
    • Experimental parameters such as substrate concentration and the liposome Janus ratio were found to influence motor performance.

    Conclusions:

    • This study provides a viable method for constructing asymmetrical, lipid-assembled, enzyme-functionalized colloids.
    • The findings highlight the critical importance of asymmetry in enabling directed particle motion.
    • The developed liposome-based micromotor system demonstrates potential for applications requiring controlled micro-scale transport.