UNIVERSITY OF IOANNINA GREECE
BIOLOGICAL APLICATIONS AND TECHNOLOGY
AQUATIC MICROORGANISMS
Team 7: Serasidis Konstantinos, Tsinoglou Makrina
Week: 2,3
Week: 2,3
Second
week’s observation: 04/11/2016
Between the
first’s week observation and the second’s a few changes have been noticed.
Firstly, the sediment seems darker in both columns, a clear indication that the
anaerobic bacteria in the column are flourishing and cause reduction of oxygen.
Also, the water of the column held in dark seems clearer than the previous week
probably because all of the sediment has settled down. The water of the control
Column appears to have a bright red-orange color that was only noticeable on
the surface of the sediment on the first week.
Between the two columns (Control and in the dark for the second week)
the only difference that is noticeable is the color. The water is colored
bright red in the Control column and is not in the Column in the dark. The
color of the water can be explained by the presence of purple non-sulfur bacteria. These include
species of Rhodopseudomonas, Rhodospirillum and Rhodomicrobium. These bacteria
grow in anaerobic conditions, gaining their energy from light reactions but
using organic acids as their carbon source for cellular synthesis. So they are
termed photoheterotroph .Therefore, it’s only reasonable for the bright red
color to appear in the Control column that is exposed to light. Additionally, green
color doesn’t appear in the column so we assume that photosynthetic bacteria
they haven’t grown yet.
1. Control column 2.Column in the dark
Third
week’s observation: 11/11/2016
Between the
second’s week observation and the third’s week the only difference that is
noticeable is the color on the Control column that seems to be more dark that
the previous week. This indicates the increasing growth of bacteria in the
column.
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