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Related Concept Videos

Base Quantities and Derived Quantities01:14

Base Quantities and Derived Quantities

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In any system of units, the units for some physical quantities must be specified through a measurement process. These measurements are the base quantities of the system, and their units are the base units of the system. The algebraic combinations of the base values can then be used to express all other physical quantities. Each of these physical quantities is then referred to as a derived quantity, with each unit being referred to as a derived unit.
The International Organization for...
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Assessment of the Cardiovascular System II: Inspection01:29

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Inspection is the initial step in assessing the cardiovascular system. It involves a detailed visual examination that provides crucial information about a patient's circulatory and cardiac health. This systematic process, conducted from head to toe, helps identify signs of cardiovascular conditions by observing physical appearance, skin and mucous membranes, jugular and carotid pulsations, chest symmetry, and the condition of the extremities.
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On many occasions, physicists, other scientists, and engineers need to make estimates of a particular quantity. These are sometimes referred to as guesstimates, order-of-magnitude approximations, back-of-the-envelope calculations, or Fermi calculations. The physicist Enrico Fermi was famous for his ability to estimate various kinds of data with surprising precision. Estimating does not mean guessing a number or a formula at random. Instead, estimation means using prior experience and sound...
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Relating Angular And Linear Quantities - I01:09

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If the rotational definitions are compared with the definitions of linear kinematic variables from motion along a straight line and motion in two and three dimensions, we can observe a mapping of the linear variables to the rotational ones.
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Relating Angular And Linear Quantities - II01:05

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In the case of circular motion, the linear tangential speed of a particle at a radius from the axis of rotation is related to the angular velocity by the relation:
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Related Experiment Video

Updated: Feb 12, 2026

Fast Inspection of Quality of Indigo Naturalis by Multiple Light Scattering
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Published on: August 18, 2023

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Quality before Quantity: Inspecting CFTR.

Hongmei Mou1

  • 1The Mucosal Immunology and Biology Research Center, Massachusetts General Hospital, Jackson 1402, 55 Fruit Street, Boston, MA 02114, USA; Massachusetts General Hospital for Children, Pediatric Pulmonary Medicine, Boston, MA, USA.

Developmental Cell
|March 28, 2018
PubMed
Summary
This summary is machine-generated.

RFFL acts as a quality control protein, identifying misfolded CFTR proteins at the cell surface. This discovery offers potential therapeutic strategies for cystic fibrosis patients.

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Area of Science:

  • Molecular biology
  • Cellular quality control mechanisms
  • Protein trafficking

Background:

  • CFTR protein biosynthesis is a dynamic process.
  • Misfolded CFTR proteins can lead to cellular dysfunction.
  • Understanding protein quality control is crucial for disease research.

Purpose of the Study:

  • To investigate the role of RFFL in CFTR protein quality control.
  • To identify the mechanism by which CFTR conformation is scrutinized at the plasma membrane.
  • To explore potential therapeutic targets for cystic fibrosis.

Main Methods:

  • Utilized cell-based assays to study CFTR protein conformation.
  • Investigated the interaction between RFFL and CFTR.
  • Examined the role of RFFL in targeting misfolded CFTR for degradation.

Main Results:

  • RFFL functions as a plasma membrane-localized scrutinizer of CFTR conformation.
  • RFFL recognizes and targets misfolded CFTR proteins for degradation.
  • This mechanism represents a critical cellular quality control checkpoint.

Conclusions:

  • RFFL plays a vital role in maintaining CFTR protein homeostasis.
  • The RFFL-mediated quality control pathway is a potential therapeutic target for cystic fibrosis.
  • Further research into this mechanism could yield novel treatment strategies.