Our names are Vasiliki Papadimitriou and Nikos Danavaras and we are presenting our results from Winogradsky column experiment from day 53 to day 90.
First of all we hane to say that from day 40 until day 52, our experiment hasn't occur any significant changes.
09/05/2016
In the fifty third day we can see that the water colour, after so many days, has become purple again. We can also notice that our sediment now is darker and that all of it has a purple colour.
23/05/2016
In the sixty seventh day we can say that our experiment looks the same except from the water level which is lower from the previous days.
30/05/2016
In the seventy fourth day we can see that the water, from one side of the bottle, has a light pink colour although the rest of the water looks purple. We can assume that the the purple colour belongs to the outer layer, that exists on the inside of our bottle.
21/03/2016
15/06/2016
Here we have two photos, one from the first day and one from the last day (90th) of our experiment. Generally we can say that the water colour from the first day until the last day, has changed many colours such as yellow, light yellow, white, green, dark pink and purple. On the other hand the colour of our sediment, which in first day had a light brown colour, after many days became black and in the last weeks of our experiment became purple such as the water colour.
These gradual changes show us the appearance of many different types of microorganisms. This experiment is a classic demonstration of how microorganisms occupy specific microsites according to their environmental tolerances and their carbon and energy requirements. Aerobic microorganisms live in the top of the bottle and the anaerobic ones live in the bottom. Finally, the column enables us to see how mineral elements such as sulphur, are cycled in natural environments.
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