If the specific growth rate, μ. is constant with time during the exponential growth period, the equation correlating bacterial number density Cn), cell number concentration with respect to time can be expressed as

• Cn= Cn0 exp[μ (t - t0)]
• Cn0 = Cn exp[μ (t - t0)]
• Cn/Cn0 =(1/μ)exp(t-t0)
• Cn0 / Cn = (1/μ)exp(t-t0)