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Related Concept Videos

Relative Velocity in One Dimension01:10

Relative Velocity in One Dimension

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The understanding of the concept of reference frames is essential to discuss relative motion in one or more dimensions. When we say that an object has a certain velocity, we must state the velocity with respect to a given reference frame. In most examples, this reference frame has been Earth. For instance, if a statement reads that a person is sitting in a train moving at 10 m/s east, then it implies that the person on the train is moving relative to the surface of Earth at this velocity,...
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Distribution of Molecular Speeds01:27

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The motion of molecules in a gas is random in magnitude and direction for individual molecules, but a gas of many molecules has a predictable distribution of molecular speeds. This predictable distribution of molecular speeds is known as the Maxwell-Boltzmann distribution. The distribution of molecular speeds in liquids is comparable to that of gases but not identical and can help to understand the phenomenon of the boiling and vapor pressure of a liquid. Consider that a molecule requires a...
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Average and Instantaneous Velocity Vectors01:12

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To calculate other physical quantities in kinematics, the time variable must be introduced. The time variable not only allows us to state where an object is (its position) during its motion, but also how fast it’s moving. The speed at which an object is moving is given by the rate at which the position changes with time. For each position, a particular time is assigned. If the details of the motion at each instant are not important, the rate is usually expressed as the average velocity v.
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Relative Motion Analysis - Velocity01:24

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A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
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Relative Velocity in Two Dimensions01:11

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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...
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Velocity of an Object01:18

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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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Related Experiment Video

Updated: Jan 16, 2026

Measuring Axonal Cargo Transport in Mouse Primary Cortical Cultured Neurons
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ArchVelo: Archetypal Velocity Modeling for Single-cell Multi-omic Trajectories.

Maria Avdeeva, Sarah Walker, Joris van der Veeken

    Biorxiv : the Preprint Server for Biology
    |September 26, 2025
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    Summary

    ArchVelo models gene regulation and cell trajectories using single-cell multi-omic data. This new method enhances accuracy for understanding dynamic cellular processes and identifying transcription factor activity.

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    Area of Science:

    • Genomics
    • Computational Biology
    • Molecular Biology

    Background:

    • Inferring dynamic cellular processes from static single-cell measurements is a significant challenge.
    • Existing methods struggle with accurate gene regulation and cell trajectory inference.

    Purpose of the Study:

    • Introduce ArchVelo, a novel computational method for modeling gene regulation and cell trajectories.
    • Leverage single-cell simultaneous chromatin accessibility (scATAC-seq) and transcriptomic (scRNA-seq) profiling for enhanced inference.

    Main Methods:

    • ArchVelo models chromatin accessibility as archetypes (shared regulatory programs).
    • It dynamically models the influence of these archetypes on transcription.
    • The method integrates scATAC-seq and scRNA-seq data.

    Main Results:

    • ArchVelo demonstrates improved inference accuracy and latent time alignment compared to previous methods.
    • It successfully identifies underlying transcription factor activity.
    • Applied to developing mouse brain, human hematopoiesis, and CD8 T cell responses, it revealed distinct differentiation and proliferation trajectories.

    Conclusions:

    • ArchVelo provides a principled framework for analyzing dynamic gene regulation in multi-omic single-cell data.
    • The method enables deeper insights into cellular processes across diverse biological systems.
    • It identified a novel differentiation trajectory in CD8 T cell progenitors relevant to immune responses and immunotherapy.