FIG. 1.

Activation of luminescence by a V. parahaemolyticus clone. Strain LLM1957 (left side of each plate) is E. coli DH5α containing two plasmids, pRS205 (V. harveyi lux operon) and pLM1950 (V. parahaemolyticus luxR-like locus). Strain LLM1958 (right side of each plate) is E. coli DH5α containing two plasmids, pRS205 and pLM1952 (a mutated form of pLM1950 containing Tn5). Strains were grown overnight on a Luria broth-ampicillin-tetracycline plate and exposed to X-ray film for 15 min (A) or photographed directly in incident light (B).