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Motor Units

Motor Units

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: Sep 24, 2025

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Published on: March 13, 2019

Light-controlled two-dimensional TiO₂ plate micromotors.

Ying Wang^1,2, Zhen Li², Alexander A Solovev¹

¹Department of Materials Science, Fudan University Shanghai 200433 People's Republic of China gshuang@fudan.edu.cn.

|May 9, 2022

Summary

This summary is machine-generated.

Researchers developed novel UV light-controlled 2D titanium dioxide (TiO2) micromotors. These surfactant-free motors move in hydrogen peroxide (H2O2) solution, offering potential for biomedical and energy applications.

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Last Updated: Sep 24, 2025

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

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Published on: March 13, 2019

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Published on: December 29, 2015

Production of Dynein and Kinesin Motor Ensembles on DNA Origami Nanostructures for Single Molecule Observation

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Published on: October 15, 2019

Area of Science:

Materials Science
Nanotechnology
Chemical Engineering

Background:

Micromotors offer potential for targeted delivery and manipulation in various fields.
Existing bubble-propelled micromotors often require surfactants and chemical fuels, limiting their applications.
Development of efficient and environmentally friendly micromotor systems is an ongoing research area.

Purpose of the Study:

To demonstrate the first UV light-controlled two-dimensional (2D) titanium dioxide (TiO2) plate micromotors.
To investigate a facile fabrication method for these micromotors.
To explore their propulsion mechanism and potential applications without surfactants.

Main Methods:

Fabrication of 2D TiO2 micromotors using anodic oxidation, cracking, and separation processes.
Observation of micromotor movement in aqueous hydrogen peroxide (H2O2) solution under UV irradiation.
Analysis of bubble generation and propulsion mechanism.
Control of micromotor speed via UV light intensity.

Main Results:

Successfully fabricated UV light-controlled 2D TiO2 plate micromotors.
Demonstrated surfactant-free propulsion in H2O2 solution, driven by generated O2 bubbles and gravity.
Showed that micromotor speed is controllable by UV light intensity.
Confirmed the generation of oxygen bubbles in the TiO2 membrane's holes as the propulsion source.

Conclusions:

UV light-controlled 2D TiO2 micromotors can be fabricated using a simple method.
These micromotors offer surfactant-free propulsion, expanding their applicability.
The controllable speed and facile fabrication present significant promise for biomedical and energy applications.