A month later, in the column changes have been produced.
On the bottom of the column, it appears a purple layer of
purple bacteria of sulphur. They have got gas vesicle, characteristic
of Amoebobacter.
The top op the column, has raise up because of this
bacterium. In this part, the water is evaporated, so the most of microorganisms are anaerobics and the aerobics microorganisms are in the thin layer on the surface.
We know this because of the different colour along the column.
These parts are far away because of the gas that produces
these microorganisms.
Then we lowered the upper layer and we added water, so the
microorganisms anaerobics and aerobics can grow up again.
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