Science Enhanced S&S Biology - Virginia Department of ...

19. Repeat steps 12–18 for each of the other samples. 20. Place each plate in a separate bag. Do not seal: this is an aerobic count. 21. Carefully dispose of all plate-preparation materials according to teacher directions. 22. Incubate plates with clear side up for 48 ± 2 hours at 35ºC. 23. ................
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