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Related Concept Videos

Resistivity01:22

Resistivity

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When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
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Resistance01:19

Resistance

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When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
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Aggregates Classification01:29

Aggregates Classification

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Aggregate classification is generally based on its size, petrographic characteristics, weight, and source. Size classification ranges from coarse to fine aggregates, defined by the size of the particles. Coarse aggregates are particles that do not pass through ASTM sieve No. 4, and aggregates that pass through the sieve are fine aggregates.
Petrographic classification groups aggregates based on common mineralogical characteristics. Some of the common mineral groups found in aggregates are...
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Equivalent Resistance01:16

Equivalent Resistance

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In circuit analysis, situations often arise where resistors are neither in series nor parallel configurations. To tackle such scenarios, three-terminal equivalent networks like the wye (Y) (Figure 1 (a)) or tee (T) and delta (Δ) (Figure 1 (b)) or pi (π) networks come into play. These networks offer versatile solutions and are frequently encountered in various applications, including three-phase electrical systems, electrical filters, and matching networks.
991
Resistance and Conductance01:25

Resistance and Conductance

518
A conductor's DC resistance at a given temperature is influenced by its resistivity, length, and cross-sectional area. Resistivity is an inherent property of the conductor material, with annealed copper serving as the international standard for measurement. For instance, the resistivity of hard-drawn aluminum at 20 degrees Celsius is 61% of the standard conductivity of annealed copper.
Various factors impact the resistance of a conductor. Spiraling in stranded conductors increases their...
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Rolling Resistance01:21

Rolling Resistance

672
When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
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SRCP1 Conveys Resistance to Polyglutamine Aggregation.

Stephanie Santarriaga1, Holly N Haver1, Adam J Kanack1

  • 1Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI 53226, USA.

Molecular Cell
|July 21, 2018
PubMed
Summary
This summary is machine-generated.

Serine-rich chaperone protein 1 (SRCP1) suppresses polyglutamine (polyQ) aggregation, a hallmark of neurodegenerative diseases. This novel chaperone facilitates the degradation of toxic protein aggregates, offering new insights into disease mechanisms.

Keywords:
Dictyostelium discoideumHuntington's diseaseamyloidchaperonepolyglutamineproteasomeubiquitin

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Automating Aggregate Quantification in Caenorhabditis elegans
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Area of Science:

  • Neurobiology
  • Molecular Biology
  • Protein Biochemistry

Background:

  • Polyglutamine (polyQ) diseases are a class of nine neurodegenerative disorders.
  • These diseases stem from expanded polyQ tracts, leading to protein aggregation.
  • Dictyostelium discoideum is a unique model organism resistant to polyQ aggregation despite naturally long polyQ tracts.

Purpose of the Study:

  • To identify the molecular mechanisms underlying polyQ aggregation resistance in Dictyostelium discoideum.
  • To characterize novel molecular chaperones involved in polyQ proteostasis.

Main Methods:

  • Genetic screening in Dictyostelium discoideum.
  • Protein aggregation assays.
  • In vitro chaperone activity assays.
  • Proteasomal degradation studies.

Main Results:

  • Serine-rich chaperone protein 1 (SRCP1) was identified as a key suppressor of polyQ aggregation.
  • SRCP1 is necessary and sufficient to prevent the aggregation of polyQ-expanded proteins.
  • SRCP1 promotes the proteasomal degradation of aggregated polyQ proteins.
  • The C-terminal domain of SRCP1 is crucial for its cellular activity and can suppress aggregation in vitro.

Conclusions:

  • SRCP1 represents a novel class of molecular chaperone.
  • SRCP1 actively manages and resolves polyQ aggregation, offering a unique biological strategy.
  • Understanding SRCP1's mechanism provides new avenues for therapeutic interventions in polyQ diseases.