Related Experiment Video
Updated: May 8, 2026
11:55
Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution
Published on: August 16, 2016
Cooperative transport in nanochannels.
Wolfgang R Bauer1, Walter Nadler
1Department of Internal Medicine I, University Hospital of Würzburg, Oberdürrbacher Strasse 6, D-97080 Würzburg, Germany. w.bauer@medizin.uni-wuerzburg.de
Summary
Particle transport in nanochannels can be cooperative, not just competitive. This study reveals that different particle species can mutually promote each other
Area of Science:
- Physical Chemistry
- Nanotechnology
- Statistical Mechanics
Background:
- Traditional models of channel transport focus on competition and selectivity.
- Simultaneous transport of multiple particle species is complex and less understood.
Purpose of the Study:
- To investigate cooperative transport phenomena in nanochannels.
- To model particle interactions and their effect on transport dynamics.
Main Methods:
- Developed a discretized Markovian model for nanochannel transport.
- Incorporated single-occupancy site conditions to simulate particle interactions.
- Numerically solved the model to analyze crowding effects.
Main Results:
- Observed three distinct transport scenarios: mutual cooperation, one-sided promotion, and mutual competition.
- Demonstrated that the presence of one particle species can enhance the transport of another.
- Highlighted the non-equilibrium nature of the system, where Onsager's relations do not apply.
Conclusions:
- Particle transport in nanochannels can exhibit cooperative behaviors beyond simple competition.
- The model provides insights into complex multi-species transport dynamics under crowding conditions.
- Findings challenge conventional views and open new avenues for understanding non-equilibrium transport phenomena.
Related Concept Videos
01:06Carrier-Mediated Transport
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.
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
01:17Pore Transport and Ion-Pair Transport
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 microscopic...
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 microscopic...
01:19Facilitated Transport
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 membrane via...
01:19Facilitated Transport
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 membrane via...
01:19Facilitated Transport
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 membrane via...
01:19Membrane Asymmetry Regulating Transporters
Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...