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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

6.1K
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...
6.1K
Equivalent Resistance01:16

Equivalent Resistance

1.0K
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.
1.0K
Resistance and Conductance01:25

Resistance and Conductance

534
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...
534
Rolling Resistance01:21

Rolling Resistance

683
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...
683
Vascular Resistance01:20

Vascular Resistance

11.4K
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...
11.4K

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Related Experiment Video

Updated: Feb 15, 2026

Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors
05:46

Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors

Published on: April 9, 2014

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[HIV drug resistance].

Anne-Geneviève Marcelin1, Vincent Calvez

  • 1Service de virologie, hôpital de la Pitié, 75651 Paris Cedex 13. anne-genevieve.marcelin@psl.aphp.fr

La Revue Du Praticien
|June 17, 2006
PubMed
Summary

Human immunodeficiency virus (HIV) drug resistance emerges when viral mutations improve replication despite antiretroviral therapy. Resistance testing aids in selecting effective salvage treatments, improving patient outcomes.

Area of Science:

  • Virology
  • Molecular Biology
  • Pharmacology

Context:

  • HIV drug resistance is a major cause of antiretroviral treatment failure.
  • Understanding resistance patterns is crucial for effective salvage therapy.
  • Distinct mutation evolution and cross-resistance profiles impact treatment choices.

Purpose:

  • To define HIV drug resistance and its implications for treatment.
  • To review the role of resistance studies in understanding viral evolution.
  • To highlight the utility of HIV drug resistance testing technologies.

Summary:

  • HIV drug resistance involves genetic changes in viral proteins (protease, reverse transcriptase, envelope) enhancing replication against inhibitors.
  • Resistance studies reveal mutation patterns and cross-resistance, guiding subsequent treatment selection.

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An Affordable HIV-1 Drug Resistance Monitoring Method for Resource Limited Settings
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An Affordable HIV-1 Drug Resistance Monitoring Method for Resource Limited Settings

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Amplifying and Quantifying HIV-1 RNA in HIV Infected Individuals with Viral Loads Below the Limit of Detection by Standard Clinical Assays
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Amplifying and Quantifying HIV-1 RNA in HIV Infected Individuals with Viral Loads Below the Limit of Detection by Standard Clinical Assays

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Related Experiment Videos

Last Updated: Feb 15, 2026

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An Affordable HIV-1 Drug Resistance Monitoring Method for Resource Limited Settings
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Amplifying and Quantifying HIV-1 RNA in HIV Infected Individuals with Viral Loads Below the Limit of Detection by Standard Clinical Assays
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  • Developed resistance testing technologies measure drug resistance, improving virological response in salvage regimens.

    • Impact:

    • HIV drug resistance testing is widely adopted in developed nations.
    • Testing is recommended for therapeutic failure in treated patients.
    • Testing is also advised for recently infected, naive patients to guide initial therapy.