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Related Concept Videos

Resistivity01:22

Resistivity

4.6K
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:
4.6K
Resistance01:19

Resistance

6.0K
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...
6.0K
Equivalent Resistance01:16

Equivalent Resistance

996
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.
996
Resistance and Conductance01:25

Resistance and Conductance

523
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...
523
Rolling Resistance01:21

Rolling Resistance

675
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...
675
Vascular Resistance01:20

Vascular Resistance

11.1K
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.
The primary determinants of vascular resistance are vessel diameter, blood viscosity, and vessel length. Among these, vessel diameter plays the most significant role due to the fourth power relationship described by...
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Updated: Feb 9, 2026

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus MRSA
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Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus MRSA

Published on: February 9, 2011

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Methicillin-resistant Staphylococcus aureus.

Andie S Lee1,2, Hermínia de Lencastre3,4, Javier Garau5

  • 1Departments of Infectious Diseases and Microbiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia.

Nature Reviews. Disease Primers
|June 1, 2018
PubMed
Summary
This summary is machine-generated.

Methicillin-resistant Staphylococcus aureus (MRSA) causes global infections, with varying prevalence due to diverse clones and resistance mechanisms. Understanding MRSA spread and resistance is key to developing new treatments and vaccines.

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Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus MRSA in Rat

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Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus MRSA in Rat
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Multiplex PCR Assay for Typing of Staphylococcal Cassette Chromosome Mec Types I to V in Methicillin-resistant Staphylococcus aureus

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Area of Science:

  • Infectious Diseases
  • Microbiology
  • Antimicrobial Resistance

Background:

  • Methicillin-resistant Staphylococcus aureus (MRSA) has been a significant global pathogen since the 1960s.
  • MRSA infections occur in both healthcare and community settings, with notable geographical variations.
  • The emergence and spread of MRSA are driven by specific bacterial clones acquiring resistance genes, such as those on staphylococcal cassette chromosome mec (SCCmec).

Purpose of the Study:

  • To provide a comprehensive overview of the global burden and characteristics of MRSA.
  • To highlight the factors contributing to MRSA's success and clinical diversity.
  • To discuss current limitations in MRSA treatment and future therapeutic and preventive strategies.

Main Methods:

  • Review of epidemiological data on MRSA prevalence and geographical distribution.
  • Analysis of the genetic basis of MRSA resistance, including SCCmec elements.
  • Examination of MRSA virulence factors and clinical manifestations.
  • Assessment of current and emerging treatment and prevention strategies.

Main Results:

  • MRSA exhibits significant geographical variation in prevalence, influenced by infection control and circulating clones.
  • MRSA's success is attributed to a combination of virulence factors and resistance to multiple antibiotics, including beta-lactams.
  • Clinical presentations range from asymptomatic colonization to severe, life-threatening invasive infections.

Conclusions:

  • Effective control of MRSA requires a deeper understanding of its colonization, transmission, and resistance evolution.
  • Limited treatment options necessitate the development of novel antimicrobials and preventative measures, such as vaccines.