The invention concerns an apparatus which has holder stations (41, 42) for individual parts (3, 5) of a microorganism settlement device (1). This settlement device (1) comprises a lower part (30 with a nutrient medium (4) and a lid (5). The lower part (3) is located in the first holder station (41). The apparatus further has an actuating arrangement (10) designed such that the lid (5) can be moved in controlled manner between the two holder stations (41, 42).
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