Finally, the
Winogradsky column illustrates how different microorganisms perform their
interdependent roles: the activities of one organism enable another to grow,
and vice-versa. These columns are complete, self-contained recycling systems,
driven only by energy from light.
We added a
lot of salt in our column because we wanted halophilic bateria to grow but they
didn`t.
Instead of
that, they have grown cyanobacteria (indicated by the Green color) and photoheterotroph
bacteria (indicated by the orange color produced by the iron oxide).
The white
color is due to the production of hydrogen sulphide precipitate produced by purple
sulfur bacteria, which use H2S instead of H2O as reducing
agent so they don’t produce O2 (they do anoxigenic photosynthesis).
Due to the
initial conditions, we suppose that halophilic bacteria will grow because of
the amount of sat we added.
How do you know that halophilic bacteria did not grow? What did you expect to see?
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