“…However, lacZY by itself is not selective enough to prevent the naturally occurring microflora from growing on the plates. Therefore, the lacZY marker cassette has been used in combination with one or more antibiotic resistances (Hofte et al, 1990;Kluepfel, 1993;Drahos et al, 1992;Bailey et al, 1995;Nairn and Chanway, 1999). The use of lacZY as a marker in microbial ecology has proved very useful in studies on dispersion and survival of bacteria.…”