“…However, other species, including Escherichia coli, Erwinia chrysanthemi, Hydrogenophaga palleronii, Serratia, and Burkholderia species, have been shown to be recipients of pWW0 (Benson and Shapiro, 1978;Nakazawa et al, 1978;Nancharaiah et al, 2003;Ramos-Gonzalez et al, 1991;Sarand et al, 2000). However, the transfer of pWW0 depends not only on the donor strains and recipient pool but also on environmental factors such as nutrient concentration and temperature (Johnsen and Kroer, 2007;Fox et al, 2008). Conjugative transfer of plasmid pWW0 was accomplished efficiently on plates (Christensen et al, 1996), in biofilm or bioaggregates Nancharaiah et al, 2003), soils (Sarand et al, 2000), on bush bean leaves (Normander et al, 1998), and in activated sludge communities (Nancharaiah et al, 2003(Nancharaiah et al, , 2008Venkata Mohan et al, 2009).…”