We are back again, and now, we are going to show the changes in our columns:
5A Winogradsky Column:
The group 5A let his Winogradsky column in an illuminated environment, and after one month, we can observe that there is a colour variation at the top of the test tube because it has acquired a red tonality in the liquid part. The solid part doesn't have colouring. It is quite reasonable, since we put a lot of N and S sources into the tube, therefore, there are a lot of anaerobic bacterias, which are responsible of the colour variation. Since the amount of anaerobic organisms is incredibly big, there aren't any kind of aerobic organisms in our test tube.
6A Winogradsky Column:
The group 6A let his Winogradsky column in a dark environment, and after approximately 30 days, the column is a little bit darker. But it continues with a little brown part at the bottom, we think it's because there aren't too many nutrients, or it will be because in that zone has grown another variety of bacteria. Throughout the column we can observe various black points and it could be accumulations of bacteria.
7A Winogradsky Column:
The group 7A let his Winogradsky column in an illuminated environment. We have observed changes after a month. The side of the column, in which the light does not reach, has a grey colour produced by anaerobic bacterias. Also, the column has a red colour in the middle. We think it may be produced by aerobic bacterias, which produce a substance with this colour. Secondly, we noticed more bubbles produced with the CH4 that bacterias expel out. Finally, we conclude with a general development of aerobic and anaerobic bacterias through the column along this month, in a way that we expected.
6A Winogradsky Column
7A Winogradsky Column
5A Winogradsky Column
What are the bacteria that you have in column 5A? What are the black spots in column 6A?
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