Forty-seven
days have passed since we prepared the column, and there are important changes on
it.
- We can appreciate that the red color has intensified throughout the entire column, but the top of it is more intense than de bottom. This is because more purple non-sulfur bacteria have grown.
- Moreover, the water is more turbid than the last time we see the column, which is a sign that there are more algae.
- There are also some green veins in the middle of the column, which indicates that green sulfur bacteria have grown there (like chlorobium).
- At
the bottom of the column, we can see that the color is still the same, between
black and grey. In this part there are cellulose fermenting microorganisms,
because it is the anaerobia part of the column in which microorganisms can´t
use the oxygen.
Purple non sulfur bacteria are photosynthetic. How do you know they are these ones if you do not compare with the dark bottle?
ReplyDeleteIn your column you have enriched in FeSO4. What do you expect the effect of this enrichment would be?