Dear Researchers,
I could see the pellet yellowish during the centrifugation steps in preparing E.Coli DH5 alpha cells for transformation. I would like to know the reasons for the color change though we restrict the time of incubation to 1.30-2 hours as well to avoid over growth too. The colonies even stays so well after transformation and patching with no variations in its morphology. Any suggestions is gladly welcomed to over come this issue. Thank you in advance!