Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Newtonian Fluid: Problem Solving

Newtonian Fluid: Problem Solving

Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...

Navier–Stokes Equations

Navier–Stokes Equations

For incompressible Newtonian fluids, where density remains constant, stresses show a linear relationship with the deformation rate, defined by normal and shear stresses. Normal stresses depend on the pressure exerted on the fluid and the rate of deformation in specific directions, which determines how fluid flows under varying pressures. Shear stresses, on the other hand, act tangentially across fluid layers. They explain how adjacent fluid layers slide relative to one another, connecting...

Self-Regulation

Self-Regulation

Self-regulation, also known as self-control, encompasses a range of cognitive and behavioral processes that allow individuals to adjust their internal states and outward actions to align with socially acceptable norms and long-term goals. It plays a fundamental role in adaptive functioning, from resisting impulsive behaviors to persisting through challenging tasks. While its benefits are widely recognized, self-regulation is not limitless. Muraven and Baumeister's theory posits that...

Autoregulation of Blood Flow

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.

Stokes' Law

Stokes' Law

Viscous forces, like friction, are intermolecular forces that resist the relative motion of molecules over each other. When a solid body moves through a liquid, viscous forces drag it in the opposite direction. The force's magnitude depends on the solid's shape and size, as well as its speed and the liquid's coefficient of viscosity, density and temperature.
The expression for the force on a solid spherical object in a fluid is called Stokes' law. Stokes' law is valid only for low Reynolds...

Surface Tension of Fluid

Surface Tension of Fluid

Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...

You might also read

Related Articles

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

Sort by

Same author

Changes in characteristics and HIV-clinical outcomes of pregnant people living with HIV in the UK.

HIV medicine·2025

Same author

Second law assessment of di methyl ether and its mixtures in domestic refrigeration system.

Scientific reports·2023

Same author

Influence of capillary tube length on the performance of domestic refrigerator with eco-friendly refrigerant R152a.

Scientific reports·2022

Same author

Complex Membrane Remodeling during Virion Assembly of the 30,000-Year-Old Mollivirus Sibericum.

Journal of virology·2019

Same author

Viral nematics in confined geometries.

Soft matter·2015

Same author

Crystal structure of bis-(thio-cyanato-κS)bis-(thio-urea-κS)mercury(II).

Acta crystallographica. Section E, Crystallographic communications·2015

Search research articles

Related Experiment Video

Updated: May 17, 2026

Forming, Confining, and Observing Microtubule-Based Active Nematics

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

Self-regulation in self-propelled nematic fluids.

A Baskaran¹, M C Marchetti

¹Martin Fisher School of Physics, Brandeis University, Waltham, MA, USA. aparna@brandeis.edu

The European Physical Journal. E, Soft Matter

|October 12, 2012

Summary

This summary is machine-generated.

Active nematic fluids exhibit unique dynamics where density and order parameters self-regulate, leading to instability. Nematic order can induce local polar order, driving density fluctuations and potentially forming smectic phases.

More Related Videos

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature

Published on: November 26, 2019

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

Published on: March 13, 2016

Related Experiment Videos

Last Updated: May 17, 2026

Forming, Confining, and Observing Microtubule-Based Active Nematics

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature

Published on: November 26, 2019

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

Published on: March 13, 2016

Area of Science:

Soft Matter Physics
Hydrodynamic Theory
Active Matter

Background:

Active fluids possess microscopic polar symmetry but exhibit macroscopic nematic symmetry.
Understanding the interplay between microscopic activity and macroscopic order is crucial for active matter systems.

Purpose of the Study:

To investigate the hydrodynamic theory of active fluids with self-propelled particles and nematic aligning interactions.
To elucidate the key dynamical features governing the behavior of these active nematic systems.

Main Methods:

Analysis of hydrodynamic theory for active fluids.
Examination of self-propelled particle dynamics with nematic alignment.
Investigation of order-disorder transitions and stability analysis.

Main Results:

Dynamical self-regulation of density by the order parameter, destabilizing the uniform nematic state.
Curvature-driven currents lead to instability within the nematic phase.
Nematic order induces local polar order, promoting density fluctuations and potential smectic ordering.

Conclusions:

Active nematics display complex self-regulation mechanisms impacting their stability.
Nematic order can spontaneously generate local polar order, a novel finding.
This mechanism offers a potential explanation for smectic ordering observed in simulations of polar clusters.