Finally

It appears in the middle zone that is brown colored, meaning  that it is more oxidized than the

Anaerobic part of the upper and posterior part, is abnormal, and may be due to the

existence of a chamber of air that when lowering it, rose a little of   black anaerobic sediment appreciating also pink tonalities.

UCA_6B_3_Finally

A month later, in the column changes have been produced.

On the bottom of the column, it appears a purple layer of purple bacteria of sulphur. They have got gas vesicle, characteristic of Amoebobacter.

The top op the column, has raise up because of this bacterium. In this part, the water is evaporated, so the most of microorganisms are anaerobics and the aerobics microorganisms are in the thin layer on the surface. We know this because of the different colour along the column.

These parts are far away because of the gas that produces these microorganisms.

Then we lowered the upper layer and we added water, so the microorganisms anaerobics and aerobics can  grow up again.

UCA_5C_4: After 6 weeks

After almost 6 weeks, there isn’t news in our winogradsky’s column, just a Little bubble on it. This bubble means that iron oxidizing bacteria still living in our winogradsky column.

Salinity was mesured, and it is 125. Knowing that the usual salinity of sea is around 35-40 we are able to say that iron oxidizing bacteria can live at this kind of salinity conditions.

We can achive the same conclussion about cianobacteria on top of the column, and even declare that color green of the column belong to green sulfur bacteria, which can obtein sulphur from plaster we added.

UCA_5C_3: First Sighting

After three week, we can appreciate that some microorganisms have grow near the surface. We could say that they are aerobic microorganisms, but if we compare our column with the column of other students we can see that the same type of microorganisms have grown in all the column.

So we can conclude that these microorganisms can't survive to the concentration of salt at the bottom of the column.

At the bottom of the column we can see how it turned into black, that means there are iron oxide, typical waste of iron oxidizing bacteria’s metabolism.