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Related Concept Videos

Endospores and Sporulation01:20

Endospores and Sporulation

Endospores are specialized, dormant cells primarily formed by Gram-positive bacteria, including Bacillus and Clostridium, enabling survival under extreme environmental conditions. Due to their unique composition and formation process, these structures are highly resistant to physical and chemical insults, such as extreme heat, ultraviolet and ionizing radiation, desiccation, and toxic chemicals. Rare instances of endospore-like structures have also been observed in some Gram-negative bacteria,...
Stringent Response in E. coli01:23

Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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Gene Regulation During Sporulation

Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
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Regulation of Bacterial Virulence

Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
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Bacterial Growth Curve

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Viral Replication: Lysogenic Cycle

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Related Experiment Video

Updated: May 11, 2026

Time-Lapse Epifluorescence Microscopy Imaging of Pseudomonas aeruginosa and Staphylococcus aureus Heterogeneous Phenotypes
07:44

Time-Lapse Epifluorescence Microscopy Imaging of Pseudomonas aeruginosa and Staphylococcus aureus Heterogeneous Phenotypes

Published on: February 14, 2025

Dormancy is not necessary or sufficient for bacterial persistence.

Mehmet A Orman1, Mark P Brynildsen

  • 1Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey, USA.

Antimicrobial Agents and Chemotherapy
|May 1, 2013
PubMed
Summary
This summary is machine-generated.

Bacterial persisters, tolerant to antibiotics, are not solely due to dormancy. Rapid growth can lead to persisters, and while low metabolic activity increases chances, it doesn't guarantee persistence, suggesting complexity beyond dormancy.

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Last Updated: May 11, 2026

Time-Lapse Epifluorescence Microscopy Imaging of Pseudomonas aeruginosa and Staphylococcus aureus Heterogeneous Phenotypes
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Published on: February 14, 2025

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ScanLag: High-throughput Quantification of Colony Growth and Lag Time
07:47

ScanLag: High-throughput Quantification of Colony Growth and Lag Time

Published on: July 15, 2014

Area of Science:

  • Microbiology
  • Bacterial Physiology
  • Antibiotic Resistance

Background:

  • Bacterial persisters are known for antibiotic tolerance.
  • Transient dormancy is commonly attributed as the cause of persistence.
  • Previous observations suggested growth inhibition precedes antibiotic exposure.

Purpose of the Study:

  • To investigate if growth inhibition is essential for the persister phenotype.
  • To experimentally determine the metabolic state of persisters.
  • To validate or refute the assumption of metabolic inactivity in persisters.

Main Methods:

  • Utilized fluorescence-activated cell sorting (FACS).
  • Employed fluorescent indicators for cell division and metabolic activity.
  • Conducted bacterial persistence assays.

Main Results:

  • Rapidly growing bacteria can develop into persisters.
  • Lack of replication or low metabolic activity increases the probability of becoming a persister.
  • The majority of dormant subpopulations (>99%) did not exhibit persistence.

Conclusions:

  • Bacterial persistence is more complex than simple dormancy.
  • Dormancy or low metabolic activity are not sufficient conditions for persistence.
  • Additional characteristics are required to fully define the persister phenotype.