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Related Concept Videos

Microtubule Associated Motor Proteins01:32

Microtubule Associated Motor Proteins

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Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular...
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Motor Units00:46

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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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Motor Units01:13

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The motor unit is a fundamental component of the neuromuscular system and plays a crucial role in coordinating muscle contractions. It consists of a somatic motor neuron, which connects and controls multiple skeletal muscle fibers, forming a single functional segment. The axon of the motor neuron branches out and establishes synaptic connections known as neuromuscular junctions with individual muscle fibers within the motor unit.
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Motor Unit Stimulation01:20

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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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Hierarchy of Motor Control01:18

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The hierarchy of motor control refers to the different levels of organization and processing involved in controlling movement in the body. These levels range from higher cortical areas involved in planning and decision-making to lower spinal cord reflexes that respond automatically to external stimuli.
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The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
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Multifunctional and biodegradable self-propelled protein motors.

Abdon Pena-Francesch1, Joshua Giltinan1, Metin Sitti2

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Biodegradable protein motors offer enhanced performance and control for microrobotics. These novel motors enable complex locomotion and diverse applications, including environmental remediation and medical operations.

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Area of Science:

  • Biomaterials Science
  • Microrobotics
  • Chemical Engineering

Background:

  • Recent advances in self-propelled chemical motors based on Marangoni forces face limitations in performance, control, and material toxicity.
  • Existing motors often fail due to poor efficiency, lack of precise maneuverability, and reliance on hazardous substances.

Purpose of the Study:

  • To develop multifunctional and biodegradable self-propelled motors addressing the limitations of current technologies.
  • To create protein-based motors with superior performance, enhanced control, and environmentally friendly characteristics.

Main Methods:

  • Utilized squid-derived proteins and an anesthetic metabolite to construct biodegradable micro-motors.
  • Engineered protein nanostructures to regulate propulsion modes, speed, lifetime, and directionality through local and external stimuli.
  • Demonstrated programmable and complex locomotion capabilities.

Main Results:

  • Achieved performance output and efficiency several orders of magnitude higher than previously reported motors.
  • Successfully controlled propulsion modes, speed, mobility lifetime, and directionality.
  • Showcased diverse functionalities including environmental remediation, microrobot powering, and cargo delivery.

Conclusions:

  • Developed versatile and biodegradable protein motors offering significant advancements in microrobotics.
  • Enabled novel design, control, and actuation strategies for autonomous microrobotic systems.
  • Highlighted potential for minimally invasive medical operations in biological environments with air-liquid interfaces.