Team 4
Tampakidou Maria-Ioanna, 1479, Mpelonias Fivos, 1178
University of Ioannina
Second week
observation: 4/11/2016
There is observable and
notable growth in both bottles. The winograsky
column-1 (contains eggs and it is closed) on the right has a big difference
this week. At first the color of the water in the top of it, is a dark
green-black. Moreover, lots of bubbles
started to emerge when the bottle was opened while in the same time an intense
smell of methane made us ‘’chocking’’ . This could be a proof for the existence of methanogen Archae. This
kind of microorganism should be present in the lower layer where the conditions
are totally anoxic. Apart from methanogens,
probably there are some sulfur chemotrophic or photosynthetic bacteria in this
specific layer. These sulfur oxidizers release H2S which could be a
contributory factor in the bad smell too. We can also assume that Iron bacteria
colonize the transition zone where de-oxygenated water from an anaerobic environment
flows into an aerobic environment (upper zone). Lastly there might be some
aerobic microorganisms on the top of the column (dark green color) like
cyanobacteria. In the winograsky column-2
(contains plasters and it is
open) the water is still clear but the mud, in some points, have become totally
black. This reveals anoxic conditions and the presence of decomposers inside
the column. These microorganisms could be sulfur or non sulfur, photosynthetic
or not bacteria.
Despite of column-1, there isn’t any observable
difference in the water zone in column-2.
This might happen because: First, there is contact between atmosphere and column.
Second there is absence of a great number of nutrients (eggs contain and make
the conditions more favorable). Therefore the microorganism increasement is
higher in the first column. On the other hand, the plaster might contribute in
the sulfur bacteria growth. Consequently, these kind of microbes may be dominant
in this column and inhibit the development of other microbe species such as
methanogens (there is any specific clue about them).
No comments:
Post a Comment