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Related Concept Videos

Turbine-Governor Control01:17

Turbine-Governor Control

Turbine-governor control is crucial for maintaining power system stability by balancing turbine mechanical power output with electrical load demand. This mechanism ensures that generator frequency and rotor speed are within acceptable limits during load variations. Turbine-generator units store kinetic energy due to their rotating masses; this energy is released to meet the load requirement when the load increases. The electrical torque of turbines rises to meet the demand, whereas the...
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Nuclear Protein Sorting

Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
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Nondepolarizing neuromuscular blockers induce paralysis by competitively blocking nicotinic acetylcholine receptors at the muscle end plate. Examples include pancuronium, mivacurium, vecuronium, and rocuronium. These quaternary ammonium derivatives are administered intravenously, are poorly absorbed, and are excreted via the kidneys.
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The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
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In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function.
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Fixed Action Patterns

A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.

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Related Experiment Video

Updated: Jun 20, 2026

Rapid Detection of Neurodevelopmental Phenotypes in Human Neural Precursor Cells (NPCs)
10:47

Rapid Detection of Neurodevelopmental Phenotypes in Human Neural Precursor Cells (NPCs)

Published on: March 2, 2018

Getting a "Hold" on NPC2.

Daniel S Ory1

  • 1Department of Medicine, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA. dory@wustl.edu

Cell Metabolism
|September 3, 2009
PubMed
Summary

Researchers found a new protein that stabilizes NPC2, a key player in moving cholesterol from lysosomes. This discovery reveals a novel cellular mechanism for managing cholesterol levels.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Metabolic Diseases

Background:

  • Lysosomal cholesterol mobilization is crucial for cellular cholesterol homeostasis.
  • The NPC1 and NPC2 proteins are essential for transporting cholesterol out of lysosomes.

Purpose of the Study:

  • To identify proteins that interact with NPC2 and regulate its function.
  • To elucidate novel mechanisms of cellular cholesterol regulation.

Main Methods:

  • Co-immunoprecipitation assays to identify NPC2-interacting proteins.
  • Western blotting to assess protein levels and stability.
  • Cellular cholesterol uptake and trafficking assays.

Main Results:

  • Identification of the Nogo-B receptor (NgBR) as an NPC2-interacting protein.

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  • Demonstration that NgBR binding stabilizes NPC2 protein levels.
  • Evidence suggesting NgBR influences NPC2-mediated cholesterol mobilization.

    • Conclusions:

    • The Nogo-B receptor is a novel regulator of NPC2 protein stability.
    • NPC2 stabilization by NgBR represents a new cellular pathway for cholesterol homeostasis.
    • Targeting the NgBR-NPC2 interaction could offer therapeutic strategies for cholesterol-related disorders.