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Related Concept Videos

Facilitated Transport01:19

Facilitated Transport

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The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
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Gas Exchange and Transport01:20

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Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.
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Primary Active Transport01:47

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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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Secondary Active Transport01:55

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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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Regulated mRNA Transport02:22

Regulated mRNA Transport

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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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Phloem and Sugar Transport02:02

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Like many living organisms, plants have tissues that specialize in specific plant functions. For example, shoots are well adapted to rapid growth, while roots are structured to acquire resources efficiently. However, sugar production is primarily restricted to the photosynthetic cells that reside in the leaves of angiosperm plants. Sugar and other resources are transported from photosynthetic tissues to other specialized tissues by a process called translocation.
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Related Experiment Video

Updated: Jan 29, 2026

How to Build a Vacuum Spring-transport Package for Spinning Rotor Gauges
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Dirac Vacuum as a Transport Medium for Information.

Q Su1, R Grobe1

  • 1Intense Laser Physics Theory Unit and Department of Physics, Illinois State University, Normal, Illinois 61790-4560, USA.

Physical Review Letters
|February 6, 2019
PubMed
Summary

Information can be transmitted loss-free using Dirac vacuum modes. A modulated electric field encodes data into the vacuum, which is then decoded by pair creation at a distant location.

Area of Science:

  • Quantum physics
  • Information theory

Background:

  • Information transfer typically relies on electromagnetic fields or matter.
  • The Dirac vacuum, a fundamental concept in quantum field theory, remains largely unexplored for information transport.

Purpose of the Study:

  • To investigate the potential of Dirac vacuum modes as a loss-free information carrier.
  • To demonstrate a method for encoding and decoding digital information using vacuum fluctuations.

Main Methods:

  • Modulating the temporal shape of a localized electric field to encode information.
  • Propagating the vacuum state distortion to a second location.
  • Using a supercritical electric field pulse to induce electron-positron pair creation.
  • Analyzing the temporal behavior of created particle yield for information retrieval.

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Related Experiment Videos

Last Updated: Jan 29, 2026

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An Inverse Analysis Approach to the Characterization of Chemical Transport in Paints
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Main Results:

  • Successfully encoded and transmitted digital information via manipulated vacuum modes.
  • Demonstrated that the information imprinted on the vacuum can be retrieved by observing particle yield.
  • The Dirac vacuum serves as a viable medium for loss-free information transport.

Conclusions:

  • Dirac vacuum modes offer a novel and potentially loss-free method for transmitting information.
  • This approach opens new avenues for quantum communication and information processing.
  • Further research can explore optimizing encoding/decoding schemes and transmission distances.