UCA_3C_2: DAY 20 - Our column after three weeks
After three
weeks we can observe some changes in our column which we are going to discuss.
First of
all, we can see on the top of the column some burbles which can be produced
from oxygen generated by aerobic organisms. This could mean that aerobic
organisms of the column, like seaweeds from the San Pedro´s River, have moved
to the top of the column looking for light to do photosynthesis. The burbles
could be from the oxygen produced in the photosynthesis. We also see green
areas that correspond with these aerobic and photosynthetic microorganisms.
(Pictures 1 and 2)
PICTURE 1.
PICTURE 2.
Then, the lower part of the column has an intensive dark color, with some little purple areas above, where the anaerobic microorganisms stay. This zone could be associated with the fermentative processes corresponded with the yeast extract added the first day. In addition, the purple areas could be produced from the metabolism of the sulphate molecules by some anaerobic bacterias. (Picture 3)
PICTURE 3.
PICTURE 4.
Juan, Jesús and Carlos.
"...aerobic organisms of the column, like seaweeds from the San Pedro´s River, have moved to the top of the column looking for light"
ReplyDeleteIf the whole column is exposed to the light, why should aerobic organisms move to the top? Also, where were they and they had to move?
What produces the black colour and which organisms produce the purple at the bottom of the column?