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Related Concept Videos

Toxicity Testing in Animals01:23

Toxicity Testing in Animals

Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
Methods for Controlling Microbial Growth01:29

Methods for Controlling Microbial Growth

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...
Chemical Agents for Microbial Control01:27

Chemical Agents for Microbial Control

Chemicals play important roles in controlling microbial growth by targeting microbial structures and functions as sanitizers, antiseptics, disinfectants, and sterilants.Alcohols are commonly used sanitizers, effectively disrupting lipid membranes, which compromises cell integrity. They are also used as antiseptics and disinfectants due to their rapid action and versatility.Phenols and their derivatives phenolics , known for denaturing proteins and disrupting cell membranes, are particularly...
Biological Methods for Microbial Control01:28

Biological Methods for Microbial Control

Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...
Antimicrobial Effectiveness01:28

Antimicrobial Effectiveness

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...
Methods to Assess Microbial Populations01:30

Methods to Assess Microbial Populations

Assessing microbial populations is crucial for understanding microbial roles in health, ecology, and industry. Various complementary techniques—both culture-based and molecular—enable detailed analysis of microbial abundance, diversity, and function.Viable Plate CountThe viable plate count is a traditional culture-based method used to estimate the number of living microbes in a sample. After serial dilution, the sample is spread onto nutrient agar plates. Each viable cell forms a visible...

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Related Experiment Video

Updated: Jun 16, 2026

An Intestine/Liver Microphysiological System for Drug Pharmacokinetic and Toxicological Assessment
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Microbiological toxicity tests using standardized ISO/OECD methods-current state and outlook.

Uwe Strotmann1, Marie-José Durand2, Gerald Thouand2

  • 1Dept. of Chemistry, Westfälische Hochschule, Recklinghausen, Germany.

Applied Microbiology and Biotechnology
|August 31, 2024
PubMed
Summary
This summary is machine-generated.

Microbial toxicity tests, standardized by ISO and OECD, reveal varying sensitivities and applications. Combining these with biodegradability tests offers a novel method for characterizing microbial inocula.

Keywords:
BiodegradationBiodegradation adaptation potential (BAP)Chemical resistance potential (CRP)Microbial toxicityPhysiological potential of an inoculum (PPI)Standardized ISO and OECD testsToxicity monitoringToximeterWastewater treatment plant

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Area of Science:

  • Environmental Science
  • Microbiology
  • Ecotoxicology

Background:

  • Microbial toxicity tests are crucial for environmental risk assessment of chemicals.
  • Standardized tests from ISO and OECD are widely used globally.
  • These tests predict chemical effects in aquatic environments and inform biodegradation studies.

Purpose of the Study:

  • To review microbial toxicity tests, including standardized and non-standardized methods.
  • To discuss their advantages, disadvantages, sensitivity, and usefulness.
  • To demonstrate the impact of microbial toxicity tests on biodegradation assessments.

Main Methods:

  • Description and discussion of various standardized and non-standardized microbial toxicity tests.
  • Comparison of microbial toxicity tests with other ecotoxicological methods.
  • Introduction of a new concept: physiological potential of an inoculum (PPI).

Main Results:

  • Standardized microbial toxicity tests exhibit significant differences in sensitivity and applicability.
  • Integrating microbial toxicity and biodegradability tests provides a new approach for inoculum characterization.
  • Microbial toxicity and ecotoxicity tests form a powerful toolkit for assessing chemical toxicity.

Conclusions:

  • Microbial toxicity tests are essential for environmental safety and biodegradation prediction.
  • A combined approach using toxicity, biodegradability, and ecotoxicity tests enhances chemical risk assessment.
  • The proposed physiological potential of inoculum concept aids in characterizing microbial inocula.