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Progress report 13.06.05. RESULTS and FUTURE ACTIVITIES. FOTON experiments: growth curves. P. putida in FOTON medium (defined M9Glu medium supplemented with 20% LB medium) at 30°C (shaking); inoculum 10 6 cfu/ml. Results similar for other bacteria.

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Progress report 13 06 05

Progress report 13.06.05

RESULTS and FUTURE ACTIVITIES


Foton experiments growth curves
FOTON experiments: growth curves

P. putida in FOTON medium (defined M9Glu medium supplemented with 20% LB medium) at 30°C (shaking); inoculum 106 cfu/ml.

Results similar for other bacteria



Planned experiments
Planned experiments species used

The experiment from the FOTON flight will be replicated on Earth following the indications of the temperature data logger

Adhesion on material will be determined either by staining and microscopic analysis or by quantitative FISH; space and Earth samples will be compared

Fluorescence staining of a steel coupon colonized by P. putida


Adhesion by mixed bacterial communities
Adhesion by mixed bacterial communities species used

Experiments performed in the first part of the project point to synergistic biofilm formation by mixed bacterial populations


Setting up new and old methods to measure adhesion biofilm formation
Setting up new (and old) methods to measure adhesion/biofilm formation

30°C

37°C

Fmed.

Fmed.

LB

LB

1 2 3 4 5 6

1 2 3 4 5 6

Curli-producing strain

Fimbriae-producing strain


A new test cell aggregation
A new test: cell aggregation formation

Sedimentation due to cell aggregation

Reduced sedimentation in non-aggregative strains

(Experiment by E. Brombacher; protocol as in Simm et al., 2004)


Progress report 13 06 05


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