The target of
this practice is to create an aquatic ecosystem. It would let us learn about
how are the bacteria from the mud of a river. In this case, our mud is from the
Rio of San Pedro.
We added
20g of mud, 60g of sand and some water.
We wanted the bacteria to have a good culture
medium, so we also added the following nutrients:
- -As
a source of carbon, 0.2g of sugar and 0.2g of cellulose.
- -As
a source of sulfur, 0.2g of plaster and 0.2g of sodium sulphate.
We mixed
all those substances with the mud and the sand, that’s how we created our column. From the part of top of
the column to the deepest part, the concentration of oxygen decrease, so that’s
how we know that the bacteria at the top of the column are aerobic and the ones
that are at the deepest part are anaerobic. There’s also a gradient of sulfide.
It comes from a very low concentration at the top of the column to a higher
concentration at the bottom.
There's a photo from the 7th day. We can apreciate that the colour of the bottom is darker, the first day the colour was equal in the whole column.
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