UCA_3C_1: DAY 1
Hello,
Our column
contains mud from Rio San Pedro’s river, yeast extract (0.1g), calcium sulfate
(0.16g), marine water and sand.
We are
Juan, Jesus and Carlos, students from Biotechnology in Cadiz, and we are going to
introduce you our Winogradsky column. We’ll be commentating on the evolution of
the column with the passage of time.
In order to
elaborate the column, we followed the next process:
- We select he nutrients and weigh them.
- We take 20.25 g of mud.
- We mix nutrients and mud with marine water.
- We put the mixture in a glass tube.We take 59.52 g of sand and 25.02 g of mud apart and we put it in the tube mixed with marine water.
- We let it quiet and wait for a stratification for some weeks
We expect
to obtain stratification in the organisms that live in the mud.
First of
all, in the lowest layer we expect to obtain quimiosinthetic bacterias, which
feed on sulfate ion present of the CaSO4. They will break down it
into sulfite ion, which is used for the bacterias above.
The cycle
goes on until the sulfur is completely oxidized, in the shape of sulfidric
acid.
Finally, we
think that the aerobic organisms will be inclined to move for the top of the
tube where is the only place where there is oxygen.
Here you
are how the column was the first day:
Hi,
ReplyDelete"obtain quimiosinthetic bacterias, which feed on sulfate ion present of the CaSO4"
Bacteria that use sulfate to respire are not chemoautotrophs, but chemohetereotrophs.
"until the sulfur is completely oxidized, in the shape of sulfidric acid."
Sulfate is reduced, not oxidised, to hydrogen sulfide, a more reduced form.
I suppose the pictures are not from teh first day as I can see some different zones have developed. Which day was this picture taken?