I have already prepared DNA extraction from mycoplasma sp. samples. I want to determine the minimum concentration of Mycoplasma sp. that can be detected by designated PCR so I need to do serial dilution, 10-fold dilution. But now the problem is I don't know where to find the method for making serial dilution from the stock of DNA extraction. The stock DNA concentration, which is from Mycoplasma gallisepticum is less than 1 ml stored in 0.5 ml microcentrifuge tube.