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Angular Momentum: Single Particle01:10

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Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
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Linear momentum is a fundamental concept in physics that describes the motion of an object. It is a vector quantity, having a magnitude equal to the product of its mass and its velocity, and direction along the object's velocity. On the other hand, linear impulse, also known as momentum impulse, is a concept in physics related to the change in the linear momentum of an object. Impulse is a vector quantity defined as the product of force and the time over which the force is applied.
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Subatomic Particles03:37

Subatomic Particles

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Related Experiment Video

Updated: Jan 30, 2026

Rapid Fluorescence-based Characterization of Single Extracellular Vesicles in Human Blood with Nanoparticle-tracking Analysis
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Toward characterizing extracellular vesicles at a single-particle level.

Chun-Yi Chiang1, Chihchen Chen2,3

  • 1Institute of Nanoengineering and Microsystems, National Tsing Hua University, Hsinchu, 30013, Taiwan.

Journal of Biomedical Science
|January 17, 2019
PubMed
Summary
This summary is machine-generated.

Researchers are developing new micro- and nanotechnologies to analyze and sort single extracellular vesicles (EVs). This advancement enables a deeper understanding of these heterogeneous cell-derived vesicles and their potential applications.

Keywords:
Atomic force microscopyDigital PCRElectrophoresisExosomeExtracellular vesicleMicrovesicleRaman spectroscopySingle particle

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Cell Biology

Background:

  • Extracellular vesicles (EVs) are crucial for intercellular communication.
  • The inherent heterogeneity of EVs necessitates single-particle analysis for accurate study.
  • Current limitations in EV analysis hinder a comprehensive understanding of their biological roles.

Purpose of the Study:

  • To review recent technological advancements in single extracellular vesicle (EV) analysis and sorting.
  • To highlight the importance of single-EV measurements due to their heterogeneity.
  • To explore how micro- and nanotechnologies facilitate EV property analysis.

Main Methods:

  • Review of emerging micro- and nanotechnological tools for single-EV analysis.
  • Discussion of technologies exploiting biochemical, electrical, mechanical, and optical EV properties.
  • Inclusion of EV sorting techniques to improve detection sensitivity and throughput.

Main Results:

  • Novel technologies enable single-particle measurements of EVs.
  • EV sorting into homogeneous subsets enhances detection capabilities.
  • Technological progress is rapidly advancing the field of EV research.

Conclusions:

  • Advanced technologies are crucial for overcoming challenges in single-EV analysis.
  • The development of new tools will significantly expand our understanding of EVs.
  • Future applications of EVs will be greatly influenced by these emerging technologies.