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Related Concept Videos

Viral Replication: Lytic Cycle01:20

Viral Replication: Lytic Cycle

Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...

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T4 Bacteriophage and E. coli Interaction in the Murine Intestine: A Prototypical Model for Studying Host-Bacteriophage Dynamics In Vivo
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THE RATE OF BACTERIOPHAGE INACTIVATION BY FILTRATES OF ESCHERICHIA COLI CULTURES.

E L Ellis1, J Spizizen

  • 1William G. Kerckhoff Laboratories of the Biological Sciences, California Institute of Technology, Pasadena.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Bacteriophage inactivation by bacterial filtrates depends on temperature and concentration. Phage inactivation is influenced by salt concentration and certain polysaccharides, with no regeneration possible.

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Area of Science:

  • Microbiology
  • Virology
  • Biochemistry

Background:

  • Bacteriophages (phages) are viruses that infect bacteria.
  • Understanding phage inactivation mechanisms is crucial for phage therapy and microbial control.

Purpose of the Study:

  • To investigate the inactivation kinetics of an anti-coli phage by homologous bacterial filtrates.
  • To explore factors influencing phage inactivation, including temperature, filtrate concentration, salt concentration, and specific polysaccharides.

Main Methods:

  • Studied the rate of inactivation of an anti-coli phage using filtrates from homologous bacterial cultures.
  • Assessed inactivation rates at different temperatures (37°C and 0°C) and filtrate concentrations.
  • Investigated the effect of various salt concentrations and specific polysaccharides (starch, inulin, gum arabic) on inactivation.

Main Results:

  • Phage inactivation rate at 37°C was proportional to both phage and filtrate concentrations.
  • At 0°C, inactivation rate became proportional to the square root of filtrate concentration.
  • Inactivation was significantly influenced by salt concentration, occurring rapidly at moderate levels and slowly at extremes. Certain polysaccharides also induced inactivation.

Conclusions:

  • A reaction scheme was proposed to explain the observed phage inactivation kinetics.
  • The study highlights the complex interplay of environmental factors (temperature, salt) and chemical agents (polysaccharides) in bacteriophage inactivation.
  • Inactivated phage particles could not be regenerated, suggesting irreversible damage.