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Related Concept Videos

ATP Driven Pumps I: An Overview01:27

ATP Driven Pumps I: An Overview

ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and are...
ATP Driven Pumps II: P-type Pumps01:34

ATP Driven Pumps II: P-type Pumps

The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V.
A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...
ATP Driven Pumps III: V-type Pumps01:30

ATP Driven Pumps III: V-type Pumps

V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
Primary Active Transport01:47

Primary Active Transport

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 they...
High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
Adiabatic Processes for an Ideal Gas01:18

Adiabatic Processes for an Ideal Gas

When an ideal gas is compressed adiabatically, that is, without adding heat, work is done on it, and its temperature increases. In an adiabatic expansion, the gas does work, and its temperature drops. Adiabatic compressions actually occur in the cylinders of a car, where the compressions of the gas-air mixture take place so quickly that there is no time for the mixture to exchange heat with its environment. Nevertheless, because work is done on the mixture during the compression, its...

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Related Experiment Video

Updated: May 8, 2026

High Speed Droplet-based Delivery System for Passive Pumping in Microfluidic Devices
10:22

High Speed Droplet-based Delivery System for Passive Pumping in Microfluidic Devices

Published on: September 2, 2009

Adiabatically driven Brownian pumps.

Viktor M Rozenbaum1, Yurii A Makhnovskii, Irina V Shapochkina

  • 1Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan. vik-roz@mail.ru

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 16, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a Brownian pump using a flashing ratchet mechanism for particle transport. The pump achieves high efficiency under adiabatic conditions, similar to Brownian motors, but with reduced efficiency due to particle fluctuations.

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Area of Science:

  • Physics
  • Statistical Mechanics
  • Nanotechnology

Background:

  • Brownian motors and pumps are crucial for directed particle transport in micro/nanoscale systems.
  • Parrondo's approach provides a framework for understanding reversible Brownian motors.
  • Adiabatic driving is a key factor in optimizing the efficiency of such systems.

Purpose of the Study:

  • To extend Parrondo's approach to adiabatically driven Brownian pumps.
  • To analyze the efficiency of a Brownian pump powered by a flashing ratchet mechanism.
  • To compare the efficiency of Brownian pumps with that of Brownian motors.

Main Methods:

  • Theoretical investigation of a Brownian pump model.
  • Application of an extended Parrondo's approach for adiabatic driving.
  • Analysis of particle transport and efficiency under varying potential dynamics.

Main Results:

  • Net particle transport is achieved through a membrane via a flashing ratchet mechanism.
  • The pumping mechanism exhibits high efficiency when potential variations are adiabatically fast or slow.
  • Pump efficiency is lower than that of Brownian motors due to particle number fluctuations.

Conclusions:

  • The study provides a theoretical framework for adiabatic Brownian pumps.
  • Optimal efficiency is achieved under specific adiabatic conditions, mirroring Brownian motor behavior.
  • Fluctuations in particle number represent a key limitation for Brownian pump efficiency compared to motors.