Rio San Pedro sediment + 30g NaCl + filter paper+ 1.51g CuSO4
In the
column that is on the dark side we can appreciate that has been produced more
oxide, because it is more orange. We have investigated and we have found that
this is sulphur oxide, which has been produced by dependent sulphur bacterium (Rhodospirillum).
This bacterium oxidizes SH2 and produces that oxide which goes down
for the column.
We also see
that the strange black thing has increased his amount. We believe that it may
be some type of oxide or even a fungus.
The rest of
the column has not change.
In column
that is on the light side, we see that on the surface there are more seaweeds
which produce more turbidity. We also
observed that the sea snail is alive.
We can
appreciate that around the column there are more cracks, and we think it is
because the gases produced by the microorganisms. On the face of the dark, we see more iron sulphide on the bottom.
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| Column on the dark. |
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| Light side of the column on the light. |
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| Darka side of the column on the dark. |
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| Both columns. |
You are right, the cracks on the side a re from the gases produced by microorganisms. What type of gases?
ReplyDeleteThe orange colour you see in the dark column are not from Rhodospirillum. This bacteria needs light (is a phototroph, Rhodo-from the bacteriochlorophyll pigments it has) and in your dark column there is no light. The orange colour in the dark are simple precipitates of iron oxides that are produced abiotically.
Did you also see that you have small burrows of (now dead) worms that are full of iron oxides?