Hello everyone!

That`s the first time we write about Winogradsky colum. We are a couple of students who are on their first year in Biotechnology in UCA.

Our colum was made with Rio San Pedro´s sediment, oil, strach and carbonate. First of all, we took the sediment and we diluted it with water. After that we added strach, oli and carbonate. We mixed it with our hands. Finally, we put that mixure in a clean empty bottle and we added water of that river too.

We brough it to our house and set it in a sunny place ( a terrace). Few days after that we could see the appearance of little black points, what we believe that are some photosyntetic bacterias. We could see that the water added changed its color to orange and we think it is caused by the bacteria´s breaht.