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Related Concept Videos

Resistivity01:22

Resistivity

4.4K
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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Resistance and Conductance01:25

Resistance and Conductance

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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.
Various factors impact the resistance of a conductor. Spiraling in stranded conductors increases their...
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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.
943
Vascular Resistance01:20

Vascular Resistance

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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.
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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Rolling Resistance01:21

Rolling Resistance

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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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Related Experiment Video

Updated: Jan 22, 2026

In Situ Characterization of Shewanella oneidensis MR1 Biofilms by SALVI and ToF-SIMS
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Shewanella decolorationis LDS1 Chromate Resistance.

Olivier N Lemaire1, Flora A Honoré1, Sébastien Tempel2

  • 1Institut de Microbiologie de la Méditerranée, Laboratoire de Bioénergétique et Ingénierie des Protéines, Centre National de la Recherche Scientifique, Aix-Marseille Université, Marseille, France.

Applied and Environmental Microbiology
|July 14, 2019
PubMed
Summary

A novel Shewanella decolorationis LDS1 strain exhibits remarkable tolerance to high temperatures and chromate, efficiently degrading toxic dyes. This discovery highlights its potential for bioremediation applications in challenging environments.

Keywords:
ShewanellabioremediationchromiumdecolorizationdndBCDEdyestemperature

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Area of Science:

  • Microbiology
  • Environmental Science
  • Biotechnology

Background:

  • The genus Shewanella is known for genetic diversity and bioremediation potential.
  • Shewanella species are often considered cold-water microorganisms, with optimal growth around 25-28°C.
  • There is a need for microbial strains capable of functioning under diverse environmental conditions.

Purpose of the Study:

  • To characterize a novel Shewanella strain isolated from the Indian Ocean.
  • To evaluate its metabolic capabilities, stress tolerance, and bioremediation potential.
  • To investigate mechanisms underlying its resistance to abiotic stresses.

Main Methods:

  • Isolation and 16S rRNA gene sequencing for species identification.
  • Growth experiments across a range of temperatures and salt concentrations.
  • Respiration and carbon assimilation assays.
  • Chromate tolerance and reduction experiments.
  • Toxic dye degradation assays.
  • Genome sequence analysis and heterologous gene production.

Main Results:

  • A novel strain, Shewanella decolorationis LDS1, was identified.
  • LDS1 efficiently grows between 24°C and 40°C, tolerates high chromate concentrations (up to 4mM at 28°C, 3mM at 40°C), and degrades various toxic dyes.
  • The strain possesses phosphorothioate modification machinery, contributing to its stress resistance, as demonstrated by enhanced chromate resistance in Shewanella oneidensis.
  • LDS1 exhibits superior tolerance to abiotic stresses compared to Shewanella oneidensis, especially at elevated temperatures.

Conclusions:

  • Shewanella decolorationis LDS1 is a robust microorganism with broad temperature and salt tolerance.
  • Its ability to metabolize diverse substrates and reduce toxic compounds like chromate and dyes makes it a promising candidate for bioremediation.
  • The phosphorothioate modification system is a key factor in its enhanced stress resistance.