Hello again, everyone! This is our second post about
our Winogradsky column, and it has been two weeks, thus we will update the state
of the bottle.
Just as a reminder, this is what our column was composed of:
-Sandy Beach sediment from Rio San Pedro's beach
-Motor Oil
-CaCO3 and FeSO4
At first, the bottle was practically dead, with just a
few sulphur-reducing bacteria. However, in just two weeks, the bottle seems to
be full of life. Lots of new colonies and bacteria have grown in both sides of
the column, most of them sulphur-reducing. We can tell that because of the orange
colour of the halo around it.
On the illuminated side, a big orange colony has grown
in the upper side of the bottle, so we can say it uses oxygen to grow; but in
the back side, the non-illuminated one, an insane amount of bacteria has grown,
with a strong grey colour; whereas the bacteria follow a black/dark pattern;
all surrounded by the already mentioned orange halo. The fact that they grow on
the non-illuminated side means that they don’t need light to survive, therefore
they are not photosynthetic, and we can see that they grow equally despite the
oxygen variation along the bottle, so it is possible that they are anaerobic,
yet tolerant, not strict.
Here are some photos of the column, taken after a week
and a half:
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In the left one we can see the big colony of the illuminated side; on the right one we observe the huge amount of grey and black bacteria that has grown on the dark side.
That is all for now, we will keep you updated with the state of the bottle, so see you all next week!
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