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Related Concept Videos

Other Stress Responses in Bacteria01:30

Other Stress Responses in Bacteria

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Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
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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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The stress response system, also known as the fight-or-flight response, is the body's automatic physiological reaction to perceived threats. Hans Selye introduced the concept of General Adaptation Syndrome (GAS) to describe the predictable pattern of changes that occur in response to stress. GAS consists of three sequential stages: alarm, resistance, and exhaustion. This model helps explain how chronic stress can contribute to health problems.
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Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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Firmicutes is a diverse phylum of Gram-positive bacteria characterized by a low GC content in their genomes. This phylum includes organisms with monoderm or diderm cell envelopes, highlighting a complex evolutionary history. Firmicutes comprises several major orders, including Lactobacillales, Clostridiales, and Bacillales, which exhibit remarkable diversity in their morphology, metabolism, and ecological roles.The order Lactobacillales includes lactic acid bacteria, which are fermentative...
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Updated: Aug 22, 2025

Prevention of Heat Stress Adverse Effects in Rats by Bacillus subtilis Strain
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Stress Response in Bifidobacteria.

Marie Schöpping1,2, Ahmad A Zeidan1, Carl Johan Franzén2

  • 1Systems Biology, Discovery, Chr. Hansen A/S, Hørsholm, Denmark.

Microbiology and Molecular Biology Reviews : MMBR
|November 14, 2022
PubMed
Summary

Probiotic bifidobacteria face stressors like oxygen and acid. Understanding their stress responses using omics technologies is key to improving their stability for health benefits.

Keywords:
DNA repair systemSOS responseacid stressbifidobacteriumbile stressheat stressosmotic stressoxidative stressprotein quality control

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Area of Science:

  • Microbiology and Probiotics
  • Gut Microbiome Research
  • Stress Physiology

Background:

  • Bifidobacteria are beneficial gut bacteria with probiotic potential.
  • Probiotic viability is challenged by stressors during production, storage, and administration.
  • Strain variability in stress tolerance impacts industrial application.

Purpose of the Study:

  • To review current knowledge on bifidobacteria's stress responses.
  • To explore molecular mechanisms underlying stability and robustness.
  • To discuss strategies for enhancing probiotic bifidobacteria stability.

Main Methods:

  • Review of existing literature on bifidobacteria stress physiology.
  • Integration of traditional methodologies with omics technologies.
  • Analysis of phenotypic and molecular responses to stressors.

Main Results:

  • Bifidobacteria exhibit multilayered responses to stressors like oxygen, acid, and bile salts.
  • Omics technologies provide new insights into stress defense mechanisms.
  • Significant heterogeneity exists in stress tolerance among bifidobacteria strains.

Conclusions:

  • Enhanced understanding of stress physiology is crucial for probiotic development.
  • Strategies to improve bifidobacteria stability are needed for commercialization.
  • Future research should address knowledge gaps in stress response mechanisms.