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Related Concept Videos

Circuit Breaker and Fuse Selection01:23

Circuit Breaker and Fuse Selection

A circuit breaker is a device engineered to interrupt fault currents and sometimes reclose automatically. When a fault current is detected, the breaker separates the electrical contacts, which generates an arc. This arc is extinguished by methods such as elongation, cooling, or splitting, depending on the breaker's design. Breakers are categorized based on the voltage they operate at and the medium used for arc extinction, such as air, oil, SF6 gas, or vacuum.
In high-voltage systems, circuit...
Reclosers and Fuses01:26

Reclosers and Fuses

Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
A comprehensive protection scheme for radial distribution...
Household Wiring And Electrical Safety01:13

Household Wiring And Electrical Safety

Companies that supply power to most modern households use three conductors, typically called a three-wire line. While one is neutral, the other two are both at 120 V but with opposite polarity, giving a voltage of 240 V between them. With a three-wire line, high-power appliances that require 240 V, such as electric stoves and clothes dryers, are linked between the two hot lines. 120 V appliances can be connected between the neutral and either of the hot lines. The neutral side, which is always...
Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...

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Related Experiment Video

Updated: Jun 22, 2026

Method for Identifying Small Molecule Inhibitors of the Protein-protein Interaction Between HCN1 and TRIP8b
10:20

Method for Identifying Small Molecule Inhibitors of the Protein-protein Interaction Between HCN1 and TRIP8b

Published on: November 11, 2016

Tripping the HCN breaker.

Diane Lipscombe1, Jennifer Qian Pan

  • 1Department of Neuroscience, Brown University, Providence, RI 02912, USA. diane_lipscombe@brown.edu

Neuron
|June 27, 2009
PubMed
Summary
This summary is machine-generated.

Trip8b (Pex5R) protein modulates hyperpolarization-activated cyclic nucleotide-gated (HCN) channels, impacting neuronal excitability and epilepsy. This bidirectional control influences both channel gating and expression, offering new therapeutic insights.

Related Experiment Videos

Last Updated: Jun 22, 2026

Method for Identifying Small Molecule Inhibitors of the Protein-protein Interaction Between HCN1 and TRIP8b
10:20

Method for Identifying Small Molecule Inhibitors of the Protein-protein Interaction Between HCN1 and TRIP8b

Published on: November 11, 2016

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Channelopathies

Background:

  • Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels are crucial for neuronal functions like pacemaking and excitability.
  • Dysregulation of HCN channels is implicated in neurological disorders, including epilepsy.
  • The precise regulatory mechanisms of HCN channels remain an active area of research.

Purpose of the Study:

  • To investigate the role of Trip8b (Pex5R) in regulating HCN channel function.
  • To elucidate how Trip8b (Pex5R) influences HCN channel gating and expression.
  • To understand the implications of Trip8b (Pex5R)-HCN channel interactions in neuronal activity and disease.

Main Methods:

  • Electrophysiological recordings to assess HCN channel activity.
  • Molecular biology techniques to study protein expression and interaction.
  • Genetic manipulation to alter Trip8b (Pex5R) levels in neurons.

Main Results:

  • Trip8b (Pex5R) directly interacts with HCN channels.
  • Trip8b (Pex5R) exhibits bidirectional control over HCN channel gating, affecting both activation and inactivation.
  • Regulation of HCN channel expression by Trip8b (Pex5R) was also observed.

Conclusions:

  • Trip8b (Pex5R) is a key regulator of HCN channel function.
  • The bidirectional control by Trip8b (Pex5R) provides a novel mechanism for modulating neuronal excitability.
  • Targeting the Trip8b (Pex5R)-HCN channel axis may offer therapeutic strategies for epilepsy and other neurological conditions.