UCA_A1, A2: Day 44

In our Winogradsky Column we can see a lot of colours that correspond to very different kind of microrganisms. On the top we can see a big green stripe, that corresponds to algas and heterotrophic bacteria. Under this stripe there is a little orange bubble and we suppose that corresponds to an iron oxidizing bacteria. Under that we can see  amounts of scattered red purple colour, a part localized just under this bubble and another part almost in the bottom of the column. The part wich is localized just under the bubble corresponds to non-sulfure bacteria and the other part corresponds to sulfure bacteria.

Alga obtains energy and carbon by doing photosyntesis  using the light energy and the water. Iron oxidizing bacterias use Fe²⁺ and CO₂.  Non-sulfure bacterias use organic carbon and light energy. Sulfure bacterias use H₂S, light energy and CO₂ that produced from the CaCO₃. The CaCO₃ and the water were introduced in the column and the iron can be contained in the mud. We also must remember that microorganisms that grow on the top have more oxygen and less sulfure and the microorganisms which are in the bottom have less oxygen and more sulfure.