I heat killed some Bordetella samples for about 2 hours at 60°C. Then I centrifuged my tubes with about 5ml at 4700rpm for about 1h, but I did not get a pellet for all them. In some of them, I saw like bacteria just floating around, more concentrated towards the lower part of the tubes, but anyway not a pellet. Why? Can anybody give me suggestions? Thanks.

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