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Related Concept Videos

Methods to Assess Microbial Communities01:19

Methods to Assess Microbial Communities

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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Assembly and Tracking of Microbial Community Development within a Microwell Array Platform
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Published on: June 6, 2017

Profiling in situ microbial community structure with an amplification microarray.

Darrell P Chandler1, Christopher Knickerbocker, Lexi Bryant

  • 1Akonni Biosystems, Inc., Frederick, MD, USA. dchandler@akonni.com

Applied and Environmental Microbiology
|November 20, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a novel amplification microarray for analyzing microbial communities in groundwater. The technology simplifies workflows and accurately tracks microbial changes during uranium reduction experiments.

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Area of Science:

  • Environmental microbiology
  • Microfluidic technology
  • Molecular diagnostics

Background:

  • Microbial communities play a crucial role in biogeochemical processes, including uranium (U) reduction.
  • Understanding microbial community dynamics is essential for environmental monitoring and remediation.
  • Current methods for analyzing microbial communities can be complex and time-consuming.

Purpose of the Study:

  • To develop and validate a closed microfluidic amplification microarray for simultaneous amplification, labeling, and hybridization.
  • To assess the technology's performance in analyzing groundwater microbial communities from an in situ field experiment.
  • To compare U(VI) mobility under varying alkalinity conditions during stimulated microbial activity.

Main Methods:

  • Development of a single, closed microfluidic chamber integrating amplification, labeling, and microarray hybridization.
  • Application of the amplification microarray to groundwater samples from a field experiment with acetate amendment and varying bicarbonate levels.
  • Correlation of amplification microarray results with 16S rRNA-targeted quantitative PCR and hybridization microarray data.
  • Analysis of microbial community succession and identification of key bacterial groups.

Main Results:

  • The amplification microarray demonstrated analytical limits of detection between 2 and 200 cell equivalents of purified DNA.
  • Microarray signatures showed strong correlation with qPCR and hybridization microarray results, confirming technology performance.
  • Distinct microbial community successions were observed, with elevated iron-reducing bacteria in acetate-treated samples.
  • Bicarbonate amendment led to lower signal intensities and faster signal decline, indicating altered microbial responses.
  • Specific bacterial genera (Azoarcus, Thaurea, Methylobacterium) responded to acetate but not bicarbonate.

Conclusions:

  • The amplification microarray represents a significant technological advancement, simplifying workflows for amplicon microarray-based tests.
  • The technology is extensible to various environmental monitoring applications.
  • Microbial community composition and response to bicarbonate influenced U reduction rates, with higher rates expected in bicarbonate-amended areas.
  • This integrated microfluidic approach offers a powerful tool for studying microbial ecology in environmental settings.