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Related Concept Videos

Velocity of an Object01:18

Velocity of an Object

Understanding how an object moves along a path requires distinguishing between motion over a time span and motion at a precise moment. A useful example is a vehicle traveling along a straight and level path, where its position at any given time is known. The initial step in analyzing this motion is to measure how far the vehicle travels over a fixed time period. This measurement, called average velocity, is computed by dividing the total change in position by the duration over which the change...
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The high speed of electrical signals results from the fact that the force between charges acts rapidly at a distance. Thus, when a free charge is forced into a wire, the incoming charge pushes other charges ahead due to the repulsive force between like charges. These moving charges move the charges farther down the line. The density of charge in a system cannot easily be increased, so the signal is passed on rapidly. The resulting electrical shock wave moves through the system at nearly the...
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Relative velocity is the velocity of an object as observed from a particular reference frame, or the velocity of one reference frame with respect to another reference frame. The concept of relative velocity can be used to describe motion in two dimensions. Consider a particle P and two reference frames S and S′. The position of the origin of S′ as measured in S is , the position of P as measured in S′ is , and the position of P as measured in S is , which can be evaluated by utilizing vector...

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Related Experiment Video

Updated: May 16, 2026

Age-dependent Dynamics of Locomotion in Caenorhabditis elegans: A Lyapunov Exponent Analysis
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Published on: September 23, 2025

Gravity-controlled gliding velocity in Loxodes.

R Bräucker1, S Machemer-Röhnisch, H Machemer

  • 1Arbeitsgruppe Zelluläre Erregungsphysiologie, Fakultät für Biologie, Ruhr-Universität, Bochum, FRG.

European Journal of Protistology
|December 1, 2012
PubMed
Summary
This summary is machine-generated.

Loxodes locomotion is influenced by gravity. This study found that Loxodes neutralize sedimentation, potentially aiding migration along oxygen gradients in freshwater habitats.

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Area of Science:

  • Microbiology
  • Biophysics
  • Ecology

Background:

  • Loxodes are single-celled eukaryotes found in diverse aquatic environments.
  • Understanding their locomotion is crucial for ecological studies, particularly concerning their response to environmental gradients.

Purpose of the Study:

  • To investigate the influence of gravity on Loxodes locomotion.
  • To quantify the gravity-dependent component of Loxodes gliding motion.
  • To explore the implications of sedimentation neutralization for Loxodes migration.

Main Methods:

  • A mass-cell approach was used to study Loxodes locomotion.
  • Cells were incubated in a defined solution and their gliding on inclined surfaces was recorded via videocamera.
  • Sedimentation rates and vertical displacement rates were measured to determine the gravity-dependent component.

Main Results:

  • Steady gliding rates of Loxodes were measured at a median of 206 μm/s.
  • The gravity-dependent component of gliding motion (Δ) was determined to be -49 μm/s.
  • Gliding rates were found to be constant across different inclinations, suggesting sedimentation neutralization.

Conclusions:

  • Loxodes actively counteract sedimentation, indicating a mechanism for controlled vertical movement.
  • Neutralization of sedimentation may facilitate Loxodes migration and accumulation along vertical oxygen gradients.
  • This finding has implications for understanding Loxodes distribution and survival in freshwater ecosystems.