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Related Concept Videos

Pore Transport and Ion-Pair Transport01:17

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
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In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps that are embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction...
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One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
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Updated: Jan 20, 2026

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Fast Ion Transport in the Three-Dimensional Reversed-Field Pinch.

P J Bonofiglo1, J K Anderson1, J Boguski1

  • 1University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.

Physical Review Letters
|September 7, 2019
PubMed
Summary
This summary is machine-generated.

Fast ion transport in helical reversed-field pinch (RFP) is dominated by classical orbit effects. Subdominant tearing modes significantly limit fast ion behavior, posing a challenge for fusion reactor applications.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Magnetohydrodynamics

Background:

  • Helical reversed-field pinch (RFP) configurations are explored as potential fusion reactor candidates.
  • Understanding fast ion confinement is crucial for achieving sustained fusion reactions.
  • Previous studies identified thermal transport barriers in helical RFPs.

Purpose of the Study:

  • To conduct the first comprehensive study of fast ion transport in helical RFPs.
  • To investigate the influence of classical orbit effects and magnetic tearing modes on fast ion confinement.
  • To identify challenges and potential solutions for fast ion transport in helical RFP fusion schemes.

Main Methods:

  • Experimental measurements, including neutron flux analysis.
  • Numerical simulations of plasma behavior and particle transport.
  • Analysis of guiding-center island formation and tearing mode influence.

Main Results:

  • Classical orbit effects are found to dominate macroscopic confinement properties.
  • Growth of the dominant fast ion guiding-center island significantly impacts confinement.
  • Subdominant tearing modes critically influence fast ion loss, corroborated by experimental and simulation data.
  • Neutron flux measurements show drastic fast ion loss at sufficient subdominant mode amplitudes.

Conclusions:

  • Subdominant tearing modes represent a key challenge for helical RFP fusion reactor designs due to their strong limitation on fast ion behavior.
  • While enhanced fast ion transport is identified, workable scenarios may exist with minimized subdominant tearing mode amplitudes.
  • Further research into controlling tearing modes is essential for the viability of helical RFPs as fusion energy sources.