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Related Concept Videos

Methods to Assess Microbial Populations01:30

Methods to Assess Microbial Populations

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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...
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Methods to Assess Microbial Communities01:19

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Microbial communities, comprising bacteria, archaea, and eukaryotic microorganisms, inhabit diverse ecosystems and play crucial roles in environmental and biological processes. Their diversity is defined by three main parameters: species richness (the number of distinct species), species abundance (the relative quantity of each species), and species evenness (how uniformly individual species are distributed in various locations). These factors together shape the structure and ecological balance...
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Microbial Growth Measurement: Direct Methods01:23

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Direct methods for measuring microbial populations in a culture are essential tools in microbiology, providing quantitative data for various applications. Among these, microscopic counts, plate counts, and serial dilution are widely used techniques, each with unique principles and applications.Microscopic CountsMicroscopic counting involves the use of a Petroff-Hausser chamber, a specialized microscope slide with a grid and defined depth. By observing a liquid culture under a microscope,...
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Microbial Growth Measurement: Indirect Methods01:27

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Estimating microbial growth is essential for understanding population dynamics and environmental adaptations. Indirect methods provide valuable insights by measuring parameters such as turbidity, metabolic activity, and biomass, enabling efficient and reproducible assessments.During exponential growth, microbial cells scatter light proportionally to their biomass, a principle used in turbidity measurements. About one million cells per milliliter produce detectable scattering, which a...
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Microbiologic methods utilized in the MAL-ED cohort study.

Eric Houpt1, Jean Gratz1, Margaret Kosek2

  • 1University of Virginia, Charlottesville.

Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America
|October 12, 2014
PubMed
Summary
This summary is machine-generated.

Enteropathogens may cause child growth faltering. The Etiology, Risk Factors and Interactions of Enteric Infections and Malnutrition and the Consequences for Child Health and Development (MAL-ED) study developed standardized methods to test for these infections globally.

Keywords:
ELISAPCRcultureenteropathogenmicroscopy

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Area of Science:

  • Global child health
  • Infectious disease epidemiology
  • Pediatric nutrition

Background:

  • Child growth faltering is a significant global health issue.
  • Enteropathogens are suspected contributors to malnutrition and impaired child development.
  • The Etiology, Risk Factors and Interactions of Enteric Infections and Malnutrition and the Consequences for Child Health and Development (MAL-ED) study investigates this link.

Purpose of the Study:

  • To establish harmonized laboratory protocols for detecting a wide array of enteropathogens.
  • To ensure quality-assured and comparable microbiological data across multiple international study sites.
  • To optimize laboratory throughput and cost-efficiency for large-scale enteric infection surveillance.

Main Methods:

  • Development of standardized diagnostic assays for diverse enteropathogens.
  • Implementation of rigorous quality assurance and control measures across 8 global sites.
  • Methodologies focused on maximizing sample processing efficiency and minimizing costs.

Main Results:

  • Harmonized protocols were successfully developed and implemented.
  • Quality-assured, comparable data were generated from all 8 MAL-ED sites.
  • Efficient laboratory procedures were established, enabling high throughput at reduced cost.

Conclusions:

  • The MAL-ED study successfully established standardized, quality-assured methods for enteropathogen detection.
  • These validated methodologies are crucial for investigating the role of enteric infections in child growth faltering.
  • The approach ensures reliable, cost-effective data collection for global child health research.