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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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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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Bacteriophage resistance mechanisms.

Simon J Labrie1, Julie E Samson, Sylvain Moineau

  • 1Department of Civil & Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Nature Reviews. Microbiology
|March 30, 2010
PubMed
Summary
This summary is machine-generated.

Bacteriophages (phages), the most abundant microbes, diversify through adaptation to bacterial antiviral defenses. This review details bacterial defense strategies and phage counter-attacks for survival.

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Area of Science:

  • Microbiology
  • Virology
  • Genetics

Background:

  • Phages are the most abundant and diverse microorganisms globally.
  • Bacterial hosts possess widespread phage resistance mechanisms.
  • Phage survival depends on overcoming these bacterial antiviral defenses.

Purpose of the Study:

  • To review bacterial antiviral mechanisms.
  • To highlight phage counter-attack strategies.
  • To explain phage adaptation and diversity.

Main Methods:

  • Literature review of phage-bacteria interactions.
  • Analysis of bacterial antiviral systems.
  • Examination of phage evasion tactics.

Main Results:

  • Bacteria employ diverse antiviral mechanisms.
  • Phages utilize sophisticated strategies to bypass or subvert these defenses.
  • This evolutionary arms race drives phage diversity.

Conclusions:

  • Understanding phage-bacteria co-evolution is crucial.
  • Phage adaptation strategies are key to their ecological success.
  • This highlights the dynamic interplay between phages and their hosts.