Some cells were adhering to the bottom of flask, which could not be separated by shaking. This did not occur previously with the same conditions. No other microorganisms were observed through microscope.
The cell was Synechocystis sp. PCC 6803, cultured in BG-11.
Yoram Gerchman
Adherence of bacteria in general, and cyanobacteria specifically, is a common phenomenon, often enhanced by stress conditions such as starvation or cyanobacteria access light. Temperature increase could also result in this phenomenon. Maybe they are lacking some nutrients?
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