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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

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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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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.
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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.
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Vascular resistance is a critical concept in understanding blood flow dynamics in the circulatory system. It refers to the resistance that blood encounters as it flows through the blood vessels. This resistance is a key factor in determining blood pressure and cardiac workload.
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MprF-mediated daptomycin resistance.

Christoph M Ernst1, Andreas Peschel2

  • 1Department of Genetics, Harvard Medical School, Boston, Massachusetts, USA; Department of Molecular Biology and Center for Computational and Integrative Biology, Massachusetts General Hospital, Boston, Massachusetts, USA; The Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA.

International Journal of Medical Microbiology : IJMM
|June 12, 2019
PubMed
Summary
This summary is machine-generated.

Daptomycin resistance in MRSA involves the Multiple Peptide Resistance Factor (MprF). New research clarifies how small nucleotide polymorphisms (SNPs) in MprF contribute to daptomycin resistance, offering a unified model for future studies.

Keywords:
Antibiotic resistanceDaptomycinFlippaseMprF

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Drug Resistance

Background:

  • Daptomycin is crucial for treating Methicillin-Resistant Staphylococcus aureus (MRSA) infections.
  • The exact mechanism of daptomycin action and resistance is not fully understood.
  • Small nucleotide polymorphisms (SNPs) in the Multiple Peptide Resistance Factor (MprF) gene are linked to daptomycin resistance.

Purpose of the Study:

  • To elucidate the role of MprF SNPs in daptomycin resistance.
  • To reconcile conflicting data on MprF activity and resistance phenotypes.
  • To propose a new, harmonized model for MprF-mediated daptomycin resistance.

Main Methods:

  • Analysis of isogenic mutants.
  • Structural insights into MprF.
  • Biochemical investigations.

Main Results:

  • A new model explaining MprF-mediated daptomycin resistance has been developed.
  • This model integrates previously conflicting resistance phenotypes.
  • Recent structural data clarifies MprF function in resistance.

Conclusions:

  • The new model provides a framework for understanding daptomycin resistance.
  • Further biochemical studies are warranted to validate the proposed mechanism.
  • Understanding MprF function is key to combating daptomycin resistance in MRSA.