Table 1. Natural transformation efficiency of C. jejuni NCTC11168.

CFU:DNA	CFU/mla	DNAb/ml	Transf./CFUac	Transf./DNA moleculead
ca. 1∶10e	3.0×108±2.9×108	6500 ng ≈ 3.5×109 DNA molecules	3.6×10−3±1.8×10−3	−
ca. 10∶1f	3.6×108±2.6×107	65 ng ≈ 3.5×107 DNA molecules	−	5.4×10−3±1.0×10−3

^aResults are mean of three replicates with standard deviation.

^bChromosomal DNA from C. jejuni NCTC11168 Δtlp1::Cam^R.

^cLimits of range tested: 10⁻⁴–10⁰ transformants/CFU.

^dLimits of range tested: 10⁻⁵–10⁻¹ transformants/DNA molecule.

^eExcess amounts of DNA.

^fLimited amounts of DNA.