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Microbial growth media are essential tools in microbiology, providing the nutrients and conditions necessary to cultivate and study microorganisms. These media are categorized by their composition, consistency, and functional roles, enabling researchers to investigate microbial physiology, behavior, and interactions.Types and Consistencies of Growth MediaGrowth media can be solid, liquid, or semisolid. Solid media, often agar-based, allow visible colony growth for isolation and enumeration.
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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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A unified and simple medium for growing model methanogens.

Daniel Dzofou Ngoumelah1,2, Falk Harnisch2, Snorre Sulheim3

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Frontiers in Microbiology
|January 27, 2023
PubMed
Summary

Researchers developed a new culture medium (BFS01) for methanogenic archaea, enabling co-culture studies in microbial electrochemical technologies. The medium supports growth for key species like Methanosarcina barkeri and Methanothrix soehngenii.

Keywords:
bioelectrochemical systemsdoubling timemedium adaptationmethanogenic archaeamicrobial electrochemical technologyspecific growth rate

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Area of Science:

  • Microbiology
  • Biotechnology
  • Environmental Science

Background:

  • Methanogenic archaea are crucial for anaerobic digestion (AD) and emerging applications like microbial electrochemical technologies (METs).
  • Culturing diverse methanogen strains under identical conditions is essential for applications such as (bio)electromethanation in METs.
  • Optimized culture media are needed to facilitate co-culture studies involving methanogens and other microorganisms, like Geobacter spp. in biofilm anodes.

Purpose of the Study:

  • To develop and optimize a novel culture medium (BFS01) for the co-cultivation of Methanosarcina barkeri, Methanobacterium formicicum, and Methanothrix soehngenii.
  • To adapt an existing medium (DSM-120) by modifying its composition, including reducing salt concentration and omitting specific organic components.
  • To validate the suitability of the BFS01 medium for supporting the growth and activity of these three methanogenic archaea for subsequent co-culture experiments.

Main Methods:

  • Modification of DSM-120 medium by removing resazurin, yeast extract, and casitone, and lowering salt concentration to create BFS01.
  • Cultivation of Methanosarcina barkeri, Methanobacterium formicicum, and Methanothrix soehngenii in the BFS01 medium.
  • Assessment of methanogen growth and activity by measuring specific growth rates and doubling times based on methane accumulation.
  • Confirmation of culture purity and species identity using 16S rRNA gene-based amplicon sequencing and whole genome nanopore sequencing.

Main Results:

  • All three tested methanogens (M. barkeri, M. formicicum, M. soehngenii) demonstrated growth and activity in the BFS01 medium.
  • Estimated specific growth rates and doubling times for M. barkeri and M. soehngenii were consistent with literature values.
  • Methane accumulation data for M. formicicum indicated sufficient growth, although specific growth rates and doubling times deviated from some literature values, potentially due to medium modifications.
  • Genomic sequencing confirmed the purity of the cultures and the identity of the species.

Conclusions:

  • The developed BFS01 medium effectively supports the growth and activity of Methanosarcina barkeri, Methanobacterium formicicum, and Methanothrix soehngenii.
  • BFS01 is suitable for co-culture studies, particularly in the context of microbial electrochemical technologies and (bio)electromethanation.
  • Observed deviations in M. formicicum's growth parameters may be attributed to the reduced salt concentration and absence of complex organic additives in BFS01, warranting further investigation into morphological changes.