April 9, 2011 - 32 went

DIY microbial life: Winogradsky column creation

In this photo:

  • green sulfur & non-sulfur bacteria?,
  • Cyanobacteria (dark green),
  • purple sulfur bacteria

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Added by Patrik
on Sep 12, 2011.
1 of 1 pages


  • Patrik

    My Winogradsky column, after 5 months of sitting out on the balcony. Started out pitch black bottom half (anaerobic), dark green at the top (cyanobacteria), with a light green band in between. The anaerobic gradient kept moving downwards, presumably as the sulfur (egg yolks) and carbon (rice straw) were getting used up by the anaerobes at the bottom. At the end I got a lovely purple sulfur bacteria bloom at the bottom, with a tangle of filamentous dark-green streamers above it - cyanobacteria? The cyanobacteria at the top at this point had died off, leaving a fluffly brown slurry - possibly fungus? Maybe went too acidic? Should have checked the pH. This was the last day of my Winogradsky experiment, before I chucked out the stinky mess, and converted it to a much more windowsill-friendly BioSphere (fine, BioPrism).

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