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Related Concept Videos

Virtual Work01:20

Virtual Work

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The principle of virtual work states that if a body is in static and dynamic equilibrium, then the sum of all the virtual work done by all external forces and couple moments for any given virtual displacement must be zero.
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Principle of Virtual Work: Problem Solving01:13

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The principle of virtual work is an essential concept in the field of mechanics and engineering. This is used to solve problems related to the equilibrium of a structure or system. It is based on the assumption that if a system is in equilibrium, the work done by all the forces during a virtual displacement is zero. This principle is applied by considering virtual displacements of the system and the corresponding work done by internal and external forces.
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Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Virtual Work for a System of Connected Rigid Bodies01:06

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Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
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Tonicity in Animals00:59

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The tonicity of a solution determines if a cell gains or loses water in that solution. The tonicity depends on the permeability of the cell membrane for different solutes and the concentration of nonpenetrating solutes in the solution within and outside of the cell. If a semipermeable membrane hinders the passage of some solutes but allows water to follow its concentration gradient, water moves from the side with low osmolarity (i.e., less solute) to the side with higher osmolarity (i.e.,...
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Tonicity in Animals01:16

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Tonicity describes the amount of solute in a solution. The measure of the tonicity of a solution, or the total amount of solutes dissolved in a specific amount of solution, is called its osmolarity. Three terms—hypotonic, isotonic, and hypertonic—are used to relate the osmolarity of a cell to the osmolarity of the extracellular fluid that contains the cells. In a hypotonic solution, such as tap water, the extracellular fluid has a lower concentration of solutes than the fluid inside...
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Two-photon Calcium Imaging in Mice Navigating a Virtual Reality Environment
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Virtual reality for animal navigation with camera-based optical flow tracking.

Ivan Vishniakou1, Paul G Plöger2, Johannes D Seelig1

  • 1Center of Advanced European Studies and Research (caesar), Bonn, Germany.

Journal of Neuroscience Methods
|August 27, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a new optical flow tracking system for virtual reality (VR) navigation studies. This camera-based method offers flexible and accurate tracking of treadmill motion for behavioral experiments.

Keywords:
Ball trackingDrosophilaNavigationOptical flowReal-time image processingSpherical treadmillVirtual reality

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Area of Science:

  • Neuroscience
  • Computer Vision
  • Behavioral Science

Background:

  • Virtual reality (VR) with spherical treadmills aids in studying neural circuits for navigation and learning across species.
  • Current methods often rely on optical mice for tracking treadmill motion.

Purpose of the Study:

  • To develop and characterize a novel, fast optical flow-based system for tracking treadmill ball motion in real-time.
  • To enable precise virtual reality behavioral experiments, particularly for small organisms like fruit flies.

Main Methods:

  • A single high-resolution camera and optical flow algorithms were used for real-time tracking of treadmill ball motion.
  • The system was integrated with an open-source game engine for VR projection, achieving high frame rates and low latency.
  • Tracking accuracy and timing were validated using calibration data.

Main Results:

  • The system achieved high-speed ball tracking at 500 Hz.
  • Virtual reality projection was updated at 120 Hz with a low latency of 30 ± 8 ms.
  • The system demonstrated successful application in behavioral studies with fruit flies.

Conclusions:

  • A flexible and accurate camera-based optical flow tracking system for VR treadmill motion was successfully developed.
  • This system provides an alternative to traditional optical mice, offering greater control over tracking parameters.
  • The developed system is suitable for high-throughput behavioral analysis in virtual reality environments.