FIG. 1.

Epifluorescence micrographs of L. lactis IL1403 before infection with bacteriophage bIL66 (40× lens objective) (a and b), 30 min after infection (100× lens objective) (c and d), and 40 min after infection (100× lens objective) (e and f) and of an artificial mixture of fixed cultures of IL1403 and Lactobacillus helveticus CNRZ493, infected with their specific phages (100× lens objective) (g and h). Micrographs were taken without a filter for excitation light (a, c, e, and g), with a filter for fluorescein (b, d, and f), and with double exposure and filters for fluorescein and rhodamine (h).