We added
20g of mud from Rio San Pedro, 60g of sand and some water, 0.2g of sugar, 0.2g of cellulose, 0.2g of plaster and 0.2g of sodium sulphate.
Today, our Winogradsky column appeared mostly black, mainly
in the middle.
Anaerobic bacteria, which are in the deep zone of the
column, have proliferate too much because of adding a lot of sulfate sources.
They use these sulfate sources in their metabolism, producing H2S
that has been accumulated at the bottom of the column (that is why depths are
grey). That excess of H2S, which is toxic, prevent the growth of other
bacteria so none of them can live on the surroundings.
What happened at the top? This part is still brown and looks
like some kind of algae have grown due to they were further away from the
source of H2S. But it will not last too much until the H2S
reaches the top, killing them.
Survival of the fittest, life is too hard inside our
winogradsky column.
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