Tzani Kalliopi

Mavridi Olga

University of Ioannina Greece
Biological Application & Technology

WEEK: 8th

Left: Winogradsky column with egg

Middle: Winogradsky column with garlic

Right: Winogradsky column with egg & garlic 

The hypothesis stated was confirmed; we observed differentiation between the three bottles in microorganisms’ development. Specifically, in the bottle with the egg as a sulfur source, we saw green sulfur bacteria characterized by a green/olive colored zone, and red-purple sulfur bacteria growing. We also saw the formation of biofilm. In the bottle with garlic as a sulfur source, we saw green sulfur bacteria and red-purple sulfur. However, we also observed the formation of FeS. Also, the water was easier to observe, since there was little to none biofilm, and we saw the growth of a plant. Finally, in the third bottle, which had both egg and garlic, we saw green sulfur bacteria, red-purple sulfur bacteria, and purple non-sulfur bacteria characterized by a red/ orange or rust colored zone. Again, in the water, there was no biofilm formation, and it had a high cyanobacterial growth.