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Related Concept Videos

Beats01:09

Beats

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The study of music provides many examples of the superposition of waves and the constructive and destructive interference that occurs. Very few examples of music being performed consist of a single source playing a single frequency for an extended period of time. A single frequency of sound for an extended period might be monotonous to the point of irritation, similar to the unwanted drone of an aircraft engine or a loud fan. Music is pleasant and exciting due to mixing the changing frequencies...
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Consider the gas molecules in a cylinder. They move in a random motion as they collide with each other and change speed and direction. The average of all the path lengths between collisions is known as the "mean free path."
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Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1:
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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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Mechanism of Ciliary Motion01:05

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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Related Experiment Video

Updated: Jan 22, 2026

High-speed Video Microscopy Analysis for First-line Diagnosis of Primary Ciliary Dyskinesia
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High-speed Video Microscopy Analysis for First-line Diagnosis of Primary Ciliary Dyskinesia

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Ciliary functional analysis: Beating a path towards standardization.

Céline Kempeneers1, Claire Seaton2, Bernardo Garcia Espinosa2

  • 1Division of Respirology, Department of Pediatrics, University Hospital Liège, Liège, Belgium.

Pediatric Pulmonology
|July 18, 2019
PubMed
Summary
This summary is machine-generated.

Primary ciliary dyskinesia diagnosis needs standardized methods. Digital high-speed video microscopy (DHSV) for ciliary functional analysis requires a standardized protocol for accurate assessment of ciliary beat frequency and pattern.

Keywords:
ciliary beat frequencyciliary beat patternciliary functionciliary videomicroscopyprimary ciliary dyskinesia

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Area of Science:

  • Medical diagnostics
  • Respiratory medicine
  • Genetics

Background:

  • Primary ciliary dyskinesia (PCD) is a genetic disorder affecting respiratory cilia function.
  • Impaired mucociliary clearance in PCD leads to chronic sinopulmonary disease.
  • Digital high-speed video microscopy (DHSV) analyzes ciliary beat frequency (CBF) and ciliary beat pattern (CBP) for PCD diagnosis.

Purpose of the Study:

  • To review current knowledge on DHSV for ciliary functional analysis in PCD.
  • To propose recommendations for a standardized DHSV protocol.
  • To introduce a quantitative and qualitative system for CBP evaluation.

Main Methods:

  • Literature review of DHSV applications in PCD diagnosis.
  • Development of a proposed standardized protocol for ciliary sample collection and processing.
  • Proposal for a novel CBP evaluation system.

Main Results:

  • Current DHSV methods for PCD diagnosis lack standardization.
  • A standardized protocol for sample handling and processing is crucial for reliable DHSV analysis.
  • A new system for quantitative and qualitative CBP evaluation is proposed.

Conclusions:

  • Standardization of DHSV is essential for accurate PCD diagnosis.
  • The proposed protocol and CBP evaluation system aim to facilitate international consensus.
  • Further research is needed to refine DHSV methodology for PCD.