One month and two weeks later.
Hello for the last time. The composition of the column has varied considerably since the other time. Being aware that almost all nutrients have been consumed and the column has been covered with parafilm.
-Aerobic bacteria have disappeared and there may only be facultative and anaerobic bacteria.
-At the top we realize reddish and greenish zones (Purple-S-Bacteria and Green-S-Bacteria).
-However, the rest of column is dark, this microorganism use the sulfate as an oxidizing agent, reducing in to sulphide (Desulfuvibrio, Clostridium…). Are also performed abiotic process. It is seen methane bubbles again as we added a lot of organic matter and many microorganisms use it like carbon source.
We hope you followed the process with us and that you have learned the mechanism of The Winogradsky Column. See you soon! :)
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