Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Ion Channels01:19

Ion Channels

The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow specific...
Electron Transport Chains01:28

Electron Transport Chains

The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
The Significance of Membrane Transport01:44

The Significance of Membrane Transport

The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
Aquaporins01:25

Aquaporins

Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Pore Transport and Ion-Pair Transport01:17

Pore 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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

WITHDRAWN: Modulation of the kinetics of 3β-hydroxy-5-oxo-5,6-secocholestan-6-al/phosphatidylethanolamine Schiff base formation by cholesterol and cholesterol crystallization.

Chemistry and physics of lipids·2015
Same author

Modulation of the kinetics of 3β-hydroxy-5-oxo-5,6-secocholestan-6-al/phosphatidylethanolamine Schiff base formation by cholesterol and cholesterol crystallization.

Chemistry and physics of lipids·2015
Same author

Room temperature ordering of dipalmitoyl phosphatidylserine bilayers induced by short chain alcohols.

Chemistry and physics of lipids·2013
Same author

The oxysterol 3β-hydroxy-5-oxo-5,6-secocholestan-6-al changes the phase behavior and structure of phosphatidylethanolamine-phosphatidylcholine mixtures.

Chemistry and physics of lipids·2011
Same author

Thermotropic properties of brain lipids in the presence and absence of local anesthetics.

Biochemical pharmacology·2010
Same author

Ion Transport through Monolayers and Interfacial Films.

The Journal of general physiology·2009

Related Experiment Video

Updated: Jul 11, 2026

A Proteoliposome-Based Efflux Assay to Determine Single-molecule Properties of Cl- Channels and Transporters
07:47

A Proteoliposome-Based Efflux Assay to Determine Single-molecule Properties of Cl- Channels and Transporters

Published on: April 20, 2015

Zwitterionic water chains as H+/OH- transporters.

I R Miller1

  • 1Department of Membrane Research, Weizmann Institute of Science, Rehovot, Israel.

Biophysical Journal
|September 1, 1987
PubMed
Summary

This study proposes a new way that hydrogen and hydroxide ions move through water. The researchers suggest that special water structures, called zwitterionic water chains, can span hydrophobic regions like lipid layers. These chains have H+ at one end and OH- at the other, allowing ions to move through otherwise impermeable barriers. The model explains why ion flux is high and why it doesn't strongly depend on pH. Computational simulations were used to test the stability of these chains. The findings support the idea that these structures are effective at ion transport. This approach could help explain how ions move in biological systems, such as cell membranes. The study provides a new perspective on the physics of ion conduction in water.

Keywords:
ion transport mechanismswater chain structureshydrogen ion conductionbiological membrane transport

Frequently Asked Questions

More Related Videos

Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane
07:38

Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane

Published on: March 30, 2015

Application of Electrophysiology Measurement to Study the Activity of Electro-Neutral Transporters
11:51

Application of Electrophysiology Measurement to Study the Activity of Electro-Neutral Transporters

Published on: February 3, 2018

Related Experiment Videos

Last Updated: Jul 11, 2026

A Proteoliposome-Based Efflux Assay to Determine Single-molecule Properties of Cl- Channels and Transporters
07:47

A Proteoliposome-Based Efflux Assay to Determine Single-molecule Properties of Cl- Channels and Transporters

Published on: April 20, 2015

Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane
07:38

Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane

Published on: March 30, 2015

Application of Electrophysiology Measurement to Study the Activity of Electro-Neutral Transporters
11:51

Application of Electrophysiology Measurement to Study the Activity of Electro-Neutral Transporters

Published on: February 3, 2018

Area of Science:

  • Physical chemistry of water
  • Membrane transport mechanisms
  • Ionic conduction in biological systems

Background:

The movement of hydrogen and hydroxide ions through water has long been a subject of scientific inquiry. It was already known that water facilitates ion transport, but the exact mechanisms remained unclear. Researchers have explored how ions move across hydrophobic barriers, such as lipid bilayers. This gap motivated further investigation into the role of water structures in ion conduction. No prior work had resolved the weak pH dependence of ion fluxes. Theoretical models have proposed various pathways for ion movement. However, experimental evidence for these models has been limited. This uncertainty drove the need for a new conceptual framework to explain ion transport.

Purpose Of The Study:

This study aimed to propose a novel mechanism for H+ and OH- transport through water. The researchers focused on structures that could span hydrophobic regions. They sought to explain the observed high ion fluxes and weak pH dependence. The motivation came from discrepancies between existing models and experimental data. The study aimed to reconcile these observations with a unified theory. The researchers considered the role of zwitterionic water chains in this process. Their goal was to provide a plausible explanation for the transport mechanism. This approach could help clarify the underlying physics of ion conduction.

Main Methods:

The researchers used theoretical modeling to investigate water structures. They considered the arrangement of water molecules in hydrophobic environments. The study focused on zwitterionic chains with H+ and OH- at opposite ends. Computational simulations were used to test the stability of these structures. The researchers examined how these chains interact with surrounding molecules. They analyzed the energy required to maintain the zwitterionic configuration. The study also considered the movement of ions through these chains. This approach allowed them to evaluate the feasibility of the proposed mechanism.

Main Results:

The study found that zwitterionic water chains can span hydrophobic layers. These chains have H+ at one end and OH- at the other. The researchers observed that these structures can facilitate ion transport. The model showed that these chains allow for high H+/OH- fluxes. The results indicated that the flux is weakly dependent on pH. The simulations supported the idea that these chains are stable in hydrophobic regions. The study also found that the chains can maintain their structure under various conditions. These findings suggest that zwitterionic water chains are effective ion conductors.

Conclusions:

The authors propose that zwitterionic water chains are H+ and OH- conductors. These structures can span hydrophobic regions and facilitate ion transport. The model explains the high fluxes observed in experiments. The weak pH dependence of the flux is attributed to these chains. The study supports the idea that these chains are stable and functional. The researchers suggest that this mechanism could be relevant in biological systems. The findings provide a new perspective on ion conduction in water. This approach could lead to a better understanding of transport processes in membranes.

The study proposes zwitterionic water chains as H+ and OH- conductors, with H+ at one end and OH- at the other.

The chains are structured to extend across the hydrocarbon layer, allowing ion transport through otherwise impermeable barriers.

The model suggests that the zwitterionic chains allow for consistent ion movement regardless of pH changes.

Simulations were used to test the stability and functionality of zwitterionic water chains in hydrophobic environments.

The high flux supports the idea that these chains are effective at facilitating ion transport through hydrophobic layers.

The authors suggest that this mechanism could explain ion transport in biological membranes, such as lipid bilayers.