Hello everybody!
This is the second time I write in
this blog .
I'm going to talk about some
changes that our Winogradsky column has experimented.
I remember that the composition of
the bottle was the following one:
Sand from Rio San Pedro´s beach
Water from a lagoon
Iron sulfate
Pieces of filter paper
Let´s see some of the changes in the bottle :
Firstly, we can see some areas of the bottle with a black
colour. This part is the non-illuminated area, so we can say that in that area,
some bacterias have grown. The reason of their growth is that the bacterias
don´t need sunlight to grow, so we can say that those bacterias are not
photosynthetic bacterias and we can say that they are anaerobic bacterias.
In this photo, we can see the change I have explained:
Secondly, we can see the growth of some microorganismes at
the bottle´s surface. The reason could be that those microorganismes have used
the sunlight and the oxygen of the air to grow, so we can say that those
microorganismes are photosynthetic and aerobic microorganismes, althought it
could be possible that those microorganismes would have used the carbon dioxide
to grow.
In the following photo you can see this changed:
PD :I add that the colour of the bottle has not changed
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