Hello
Winoblog, we are three students from Cádiz University and this is
the first post we publish about our Winograndsky column.
We
have used sandy beach sediment from Río San Pedro beach. The column
was created on Wednesday, 4th March, in Science Faculty laboratory.
It
has been added material enrichment such as calcium sulfate, calcium
carbonate, filter paper cut into pieces (cellulose), and sodium
chloride (salt).
Firstly,
it has been added sandy beach sediment on a bucket. Then, it has been
added the material enrichment mentioned before and meanwhile we were
mixing at the same time. Before the mixture was introduced in the
Aquarius bottle (Winograndsky column), it had been added a little bit
of watter from the same beach as the sediment, so that the mixture
got more liquid than before. Finally, once the mixture was introduced
in the bottle, it was added two centimetres more of watter.
The
sediments take up 0.8 dm3 of the bottle.
The
column is located next to a window. The sun warms up one side of the
column and the other side doesn't receive the sun light because it is
next to a wall.
If
we analyze the progress reached in the first week, our bottle
contains black points spread out uniformly. We notice black lines in
the part which the sun warms up. There are bigger black points which
are probably colonies formed by bacterias. There are some dark spots
(they're grey) too. That spots are more numerous and bigger in the
dark side of the bottle. The last phenomenon we can observe is that,
in the surface, there are tiny shells sticked to the bottle.
The
scientific hypothesis is that it will probably appear purple and
green bacterias (due to we have added sulphates), cyanobacterias and
seaweeds in the surface of the bottle (due to they're aerobic
bacterias), and grey and dark grey bacterias (sulfur-reducing
bacterias and glucose fermenting bacteria, respectively).
You
can see the results on the next images:
(This is the place where the column is)
GROUP 1-A
Nicely done. The shells are probably animals that were in the sediment and have died. Is the sediment surface black?
ReplyDeleteDoes anyone have any idea what these back spots are? It is not due to dark grey or grey bacteria. ;-)
In your opinion, could the light affect the formation of the black spots?
No, the surface isn't black, it's brown and there are some substances floating on it.
DeleteWe think that black spots are fungus, or maybe they are bacterias that will become purple in the future. It isn't affected by the light because there are black spots all over the bottle.