3.1.2.3 Bacteria preparation
i) Bacteria used in bioweathering experiments
A gram-negative bacterial strain of bacilli Pseudomonas aeruginosa (n° CIP 105094) used in
the bioweathering experiments was available from the Institute Pasteur (Paris, France). Before
the employment in the biotic experiments, bacteria were grown in Luria Bertani medium for
24 h. Afterwards, cells were harvested and cleaned 3 times with sterile 5% NaCl and re-
suspended in ultrapure water. Thereafter, cells were introduced to the experimental bottles.
No adaptation of bacteria to high metallic element concentrations was done. All biotic
experiments began with initial optical density at a wavelength of 600 nm (OD
600
) of 0.008 in
order to ensure equal bacterial cell number for all replicates.
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