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Related Concept Videos

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Deep Sea Microbial Ecology

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The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches...
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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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Soil microbial ecology is defined by highly diverse, spatially structured communities that drive nutrient cycling, organic matter turnover, and overall ecosystem stability. Although a gram of soil can contain thousands of bacterial and archaeal taxa, the ecological processes they mediate are even more crucial for sustaining terrestrial life.Microhabitats and NichesSoil is a heterogeneous mixture of minerals, organic matter, water, and air. Microbes inhabit distinct microhabitats formed by...
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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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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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Related Experiment Video

Updated: May 3, 2026

DNA Stable-Isotope Probing DNA-SIP
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Stable isotope probing to study functional components of complex microbial ecosystems.

Sophie Mazard1, Hendrik Schäfer

  • 1Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, Australia.

Methods in Molecular Biology (Clifton, N.J.)
|February 12, 2014
PubMed
Summary

Stable isotope probing (SIP) identifies key microbes in ecosystems by tracking labeled nutrients. This culture-independent method reveals organisms crucial for nutrient cycles, even rare ones.

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Area of Science:

  • Microbiology
  • Environmental Science
  • Molecular Biology

Background:

  • Understanding microbial roles in ecosystems is vital for nutrient cycling.
  • Traditional methods struggle to identify key organisms, especially rare ones.
  • Metagenomic studies can be overwhelming and lack functional insights.

Purpose of the Study:

  • To present a method for dissecting DNA/RNA of key organisms in biochemical processes.
  • To enable identification of crucial microorganisms involved in nutrient cycling.
  • To overcome limitations of traditional isolation and large-scale metagenomic studies.

Main Methods:

  • Utilizing stable isotope probing (SIP) to label and separate nucleic acids.
  • Applying SIP to track organisms involved in specific biochemical transformations.
  • Employing a culture-independent technique applicable to diverse ecosystems and pathways.

Main Results:

  • SIP successfully labels and separates nucleic acids from key microbial players.
  • Identifies organisms central to biochemical transformations, irrespective of abundance.
  • Provides a targeted approach to study microbial communities and nutrient cycles.

Conclusions:

  • SIP is a versatile and effective method for studying microbial ecology and function.
  • It offers a powerful alternative to extensive metagenomic analyses.
  • Enables targeted research into specific organisms and biochemical pathways.