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Related Concept Videos

Physical Methods for Controlling Microbial Growth: Temperature01:23

Physical Methods for Controlling Microbial Growth: Temperature

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Heat is a widely used method to control microbial growth by targeting and denaturing cellular proteins, thereby killing or inactivating microbes. This method's effectiveness is quantified using parameters such as the thermal death point (TDP), thermal death time (TDT), and decimal reduction time (D value). TDP represents the lowest temperature at which all microorganisms in a liquid suspension are eliminated within 10 minutes, whereas TDT is the time necessary to achieve sterilization at a...
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Factors Influencing Microbial Growth: Temperature01:27

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Microorganisms display remarkable adaptations, enabling them to thrive in diverse ecological niches across a wide range of temperatures. Temperature profoundly influences microbial growth by affecting enzymatic activity, membrane fluidity, and other cellular processes.Each microorganism operates within a specific temperature range defined by three cardinal points: minimum, optimum, and maximum. Below the minimum temperature, membranes lose fluidity, halting transport processes. Above the...
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Factors Influencing Microbial Growth: Osmolarity01:28

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Osmolarity is the measure of solute concentration in a solution. It plays a critical role in determining water availability for organisms. Water moves across semipermeable membranes through osmosis, flowing from regions of lower solute concentration (more dilute) to regions of higher solute concentration (more concentrated).In high-solute environments, microbial cells lose water, leading to dehydration and inhibited growth. The extent to which water is available to microbes in such environments...
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Antimicrobial Effectiveness01:28

Antimicrobial Effectiveness

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The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
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Methods for Controlling Microbial Growth01:29

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Microbial growth control refers to various methods employed to inhibit, reduce, or eliminate microorganisms to ensure safety and hygiene across different settings. These methods are categorized based on the target environment and the level of microbial control required.Biocides are versatile agents designed to control microorganisms by either inhibiting their growth or outright killing them. These agents work through various physical, chemical, mechanical, or biological mechanisms. The...
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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,...
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Updated: Dec 25, 2025

Resurrection of Dormant Daphnia magna: Protocol and Applications
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Dormancy dampens the microbial distance-decay relationship.

K J Locey1, M E Muscarella1, M L Larsen1

  • 1Department of Biology, Indiana University, Bloomington, Indiana, USA.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|March 24, 2020
PubMed
Summary
This summary is machine-generated.

Microbial seed banks, dormant reservoirs of biodiversity, influence bacterial community biogeography. These seed banks, alongside environmental filtering, explain large-scale spatial patterns in bacterial communities.

Keywords:
biogeographydistance–decaydormancyenvironmental filteringmicrobial ecologyseed banks

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Area of Science:

  • Microbial ecology
  • Biogeography
  • Community ecology

Background:

  • Dormancy, a state of reduced metabolic activity, allows organisms to survive unfavorable conditions, forming 'seed banks'.
  • These seed banks are hypothesized to influence biodiversity patterns by reducing environmental filtering and increasing dispersal.
  • However, empirical evidence linking dormancy to microbial biogeographic patterns is scarce.

Purpose of the Study:

  • To investigate the influence of dormancy on bacterial community biogeography in forested ponds.
  • To compare the biogeographic patterns of total (DNA) and active (RNA) bacterial communities.
  • To model the ecological processes shaping microbial community assembly.

Main Methods:

  • Constructed geographical and environmental distance-decay relationships (DDRs) for bacterial communities using 16S rRNA gene surveys.
  • Analyzed both total (DNA) and active (RNA) community data to differentiate between dormant and active microbes.
  • Developed and utilized a platform of mechanistic models with over 10^6 simulations to test ecological hypotheses.

Main Results:

  • Total bacterial communities exhibited greater diversity and weaker distance-decay relationships than active communities.
  • Model simulations best approximated empirical data when strong environmental filtering and long-lived seed banks were included.
  • Dispersal, when included in models, generally reduced their performance in approximating observed patterns.

Conclusions:

  • Findings support theoretical predictions that microbial seed banks significantly influence biogeographic patterns.
  • Environmental filtering and dormancy-driven seed banks are key processes shaping bacterial community assembly at regional scales.
  • The study highlights the importance of considering dormancy in microbial ecology and biogeography.