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Related Concept Videos

Electron Carriers01:24

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.
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
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Carrier Transport01:21

Carrier Transport

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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.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
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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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Cellular Differentiation00:57

Cellular Differentiation

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How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
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Targeted Plasma Membrane Delivery of a Hydrophobic Cargo Encapsulated in a Liquid Crystal Nanoparticle Carrier
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Biocompatible crosslinked β-cyclodextrin nanoparticles as multifunctional carriers for cellular delivery.

Stefan Datz1, Bernhard Illes, Dorothée Gößl

  • 1Department of Chemistry, Nanosystems Initiative Munich (NIM), Center for Nano Science (CeNS), University of Munich (LMU), Butenandtstr. 5-13, 81377 Munich, Germany. hanna.engelke@cup.lmu.de bein@lmu.de.

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Summary

Researchers developed novel, biocompatible nanoparticles from crosslinked organic molecules for advanced theranostics. These drug delivery systems show rapid cell uptake and pH-responsive cargo release, enabling targeted therapy and diagnostics.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Nanoparticle-based drug delivery systems offer potential solutions to conventional therapy limitations.
  • Biocompatible nanocarriers with controlled release are crucial for effective theranostic applications.

Purpose of the Study:

  • To synthesize and characterize novel, biocompatible, and multifunctional nanoparticles for theranostic applications.
  • To evaluate the cell uptake kinetics, cargo loading, and release behavior of the synthesized nanoparticles.

Main Methods:

  • Synthesis of nanoparticles via covalent crosslinking of beta-cyclodextrin (CD) precursors with organic linkers.
  • Characterization of nanoparticle size, stability, dispersibility, and pore system.
  • Covalent labeling with dyes for in vitro tracking, cell uptake studies with HeLa cells, and cargo loading/release experiments.

Main Results:

  • Obtained small (∼150 nm), thermally stable, water-dispersible nanoparticles with accessible pores.
  • Demonstrated rapid, sugar-mediated cell uptake within 30 minutes in HeLa cells.
  • Showcased pH-responsive cargo release and successful in vitro applications including nuclei staining and doxorubicin-mediated cell killing.

Conclusions:

  • The novel crosslinked organic nanoparticles represent a promising platform for developing controllable and highly biocompatible theranostic systems.
  • The demonstrated features of rapid uptake and responsive release pave the way for advanced drug delivery and diagnostic applications.