Last Week of Winogradsky Column (02-06-2017). Group A5.

Before we have to say goodbye to our little Winogradsky column, we're going to discuss the new results.

We're going to miss that shiny green coming from the cianobacteria growing along the column, even though it has been covered by a brown shade in some spots that maybe appeared because they weren't receiving enough light.

We can still see that layer of bacteria floating of the surface. We can see the water seems dirtier and that means there are more bacteria growing there, giving that green colour specific from cianobacteria.

About the dark grey area, we still have a large amount of it, due to the organic waste of our microorganisms. Also, some methane gaps have appeared, so we may have microorganisms that can expel this gas.

The new and cool thing we must talk about this week is that small red line. This is because we have purple sulfur bacteria growing here. It belongs to the anaerobic zone, that's why it's almost at the end of the column. At the beginning is the aerobic zone because there is more oxygen thanks to the hole we made on the paraffin layer.