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Related Concept Videos

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Electron Carriers

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Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
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Carrier Transport01:21

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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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The ADP/ATP Carrier Protein01:42

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ADP/ATP carrier or AAC protein is the most abundant carrier protein in the inner mitochondrial membrane. It transports large quantities of ADP and ATP, equivalent to the average human body weight, every day. Among other transporters, ACC protein is one of the best-studied members of the mitochondrial carrier protein family. The ADP/ATP carrier protein comprises two transmembrane helices connected to a loop and a single alpha-helix on the matrix side. It switches between two conformational...
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Carrier Generation and Recombination01:22

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
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Carrier-Mediated Transport01:06

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Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
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Oxygen Transport in the Blood01:27

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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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Updated: Feb 9, 2026

Author Spotlight: Utilizing Next-Generation Polymerized Human Hemoglobin for Improved Donor Lung Evaluation and Preservation in Rats
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Oxygen carriers.

Thomas M S Chang1

  • 1Faculty of Medicine, McGill University, Montreal, Quebec, Canada. artcell@med.mcgill.ca

Current Opinion in Investigational Drugs (London, England : 2000)
|September 5, 2002
PubMed
Summary
This summary is machine-generated.

Current oxygen carriers, including polyhemoglobins and conjugated hemoglobins, are in clinical trials. Future developments focus on novel hemoglobin-based oxygen carriers with antioxidant properties and microencapsulated technologies for improved therapeutic applications.

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Area of Science:

  • Biomedical Engineering
  • Hematology
  • Drug Development

Background:

  • Hemoglobin-based oxygen carriers (HBOCs) are being developed as blood substitutes.
  • Previous generations faced challenges, necessitating further innovation.

Purpose of the Study:

  • To review the current status of advanced oxygen carriers.
  • To identify key research areas for future development.

Main Methods:

  • Review of clinical trial data for polyhemoglobins and conjugated hemoglobins.
  • Analysis of perflubron-based emulsions and recombinant human hemoglobin.
  • Examination of third-generation oxygen carriers using microencapsulation.

Main Results:

  • Several polyhemoglobins and conjugated hemoglobins are in advanced clinical trials.
  • Perflubron emulsions and novel recombinant hemoglobins are under development.
  • Third-generation carriers utilize microencapsulation for enhanced properties.

Conclusions:

  • Significant progress has been made in HBOC development, with multiple candidates in clinical trials.
  • Future research should focus on carriers with antioxidant properties and advanced delivery systems like nanocapsules.