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

Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

3.3K
When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
3.3K
Wood Surfacing01:14

Wood Surfacing

367
Wood surfacing is a critical finishing process designed to smoothen the wood surface, enhance its dimensional accuracy, and make handling safer. This process compensates for potential shrinkage during the seasoning phase by marginally increasing the wood dimensions before surfacing. It also helps correct some distortions that may occur as the wood dries.
The equipment used in the surfacing process is a plane equipped with rotating blades. This tool efficiently smoothens the wood surface and can...
367
Area of a Surface of Revolution01:29

Area of a Surface of Revolution

74
Surfaces of revolution are formed when a two-dimensional curve is rotated around an axis, producing a three-dimensional shape. This concept is used in engineering tasks like determining the surface area of a rocket nozzle, where precise calculations are critical for applying uniform heat-resistant coatings. When a curve is revolved about the x-axis, it sweeps out a continuous surface whose area must be calculated accurately to estimate material requirements.Approximating with Conical BandsTo...
74
Cell-surface Signaling01:21

Cell-surface Signaling

54.9K
Hormones—or any molecule that binds to a receptor, known as a ligand—that are lipid-insoluble (water-soluble) are not able to diffuse across the cell membrane. In order to be able to affect a cell without entering it, these hormones bind to receptors on the cell membrane. When a first messenger, a hormone, binds to a receptor, a signal cascade is set off, causing second messengers, proteins inside the cell, to become activated, resulting in downstream effects.
54.9K
Surface Appendages of Archaea01:23

Surface Appendages of Archaea

696
Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...
696
Response Surface Methodology01:16

Response Surface Methodology

684
Response Surface Methodology (RSM) is a collection of statistical and mathematical techniques used to develop, improve, and optimize processes. It is particularly valuable when many input variables or factors potentially influence a response variable.
The process of RSM involves several key steps:
684

You might also read

Related Articles

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

Sort by
Same author

Helical opto-thermoviscous flows drive out-of-plane rotation and particle spinning in a highly viscous micro-environment.

Light, science & applications·2026
Same author

Small-molecule binding and sensing with a designed protein family.

Nature communications·2026
Same author

Stable de novo protein design via joint conformational landscape and sequence optimization.

Nature communications·2025
Same author

Rotation reversal of chiral bacterial vortices.

Soft matter·2025
Same author

RNA sequence design and protein-DNA specificity prediction with NA-MPNN.

bioRxiv : the preprint server for biology·2025
Same author

Modeling protein-small molecule conformational ensembles with PLACER.

Proceedings of the National Academy of Sciences of the United States of America·2025

Related Experiment Video

Updated: Feb 14, 2026

A Performance-testing Platform for a Conduction Micropump with an FR-4 Copper-clad Electrode Plate
06:46

A Performance-testing Platform for a Conduction Micropump with an FR-4 Copper-clad Electrode Plate

Published on: October 9, 2017

6.3K

Helical micropumps near surfaces.

Justas Dauparas1, Debasish Das1, Eric Lauga1

  • 1Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, CB3 0WA, United Kingdom.

Biomicrofluidics
|February 13, 2018
PubMed
Summary
This summary is machine-generated.

Confined bacteria generate surface flows via flagellar rotation. Optimal fluid pumping occurs when bacteria are tilted, with flagella shapes near optimal for micropumps.

More Related Videos

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

8.3K
Helical Organization of Blood Coagulation Factor VIII on Lipid Nanotubes
12:24

Helical Organization of Blood Coagulation Factor VIII on Lipid Nanotubes

Published on: June 3, 2014

12.7K

Related Experiment Videos

Last Updated: Feb 14, 2026

A Performance-testing Platform for a Conduction Micropump with an FR-4 Copper-clad Electrode Plate
06:46

A Performance-testing Platform for a Conduction Micropump with an FR-4 Copper-clad Electrode Plate

Published on: October 9, 2017

6.3K
Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

8.3K
Helical Organization of Blood Coagulation Factor VIII on Lipid Nanotubes
12:24

Helical Organization of Blood Coagulation Factor VIII on Lipid Nanotubes

Published on: June 3, 2014

12.7K

Area of Science:

  • Fluid dynamics
  • Microbiology
  • Biophysics

Background:

  • Bacteria confined near surfaces can generate fluid flows.
  • Bacterial flagella rotation creates forces and torques in the surrounding fluid.

Purpose of the Study:

  • To model fluid transport generated by confined bacteria.
  • To determine optimal bacterial configurations and flagellar shapes for micropumping applications.

Main Methods:

  • Developed a mathematical and computational model.
  • Utilized linear superposition of fundamental flow singularities.
  • Analyzed the fluid dynamics of helical bacterial flagella.

Main Results:

  • Flagellar rotation induces net flow along surfaces, angled to the flagellar axis.
  • Optimal fluid pumping achieved when bacteria are tilted relative to the desired flow direction.
  • Bacterial flagella shapes are nearly optimal for micropumping near surfaces.

Conclusions:

  • Bacterial flagellar rotation is an effective mechanism for generating surface flows.
  • Bacterial tilt angle is crucial for optimizing fluid transport.
  • The near-optimality of flagellar shapes may inform bacterial swarm expansion strategies.