UNIVERSITY OF IOANNINA
Our experiment took place in Vrellis Lake of Ioannina on 21.10.2016 at 13:00 o’clock.
We used two plastic bottles (1,5L), a funnel, sediment from the lake (mud), a sheet of newspaper, two whole eggs (with the pod) and water from the lake. After mixing the sediment with the enrichment materials, we filled the ¾ of the first bottle and then we added water from the lake. In the second one we filled the ¼ of the bottle with the sediment and the enrichment materials and the other 2/4 without them (just the sediment from the lake). After that we added water from the lake till the top of the bottle. We left the bottle in a calm situation to precipitate our sample and then we placed it in a spot with light during the entire day and stable temperature.
We are expecting that microorganisms in the first bottle will grow up faster than the second one because they have access in more nutritional ingredients (we provide them more carbon(newspaper) and sulphur(eggs) source), or otherwise we will notice that so much quantity of nutritional ingredients is a negative growth regulator.
Left one: bottle with ¾ sediment-enrichment materials and lake water
Right one: bottle with ¼ sediment-enrichment materials, 2/4 sediment and lake water