Figure 1

Test panel of 21 Actinomycetales strains in droplets. Dark-field images at 10x magnification of droplets inoculated with spores of indicated strains after 2–13 days of droplet incubation are displayed (λ ~ 10). Next to the images information is provided about the strain, culture medium, duration of droplet incubation until the image was recorded and the results of testing supernatant samples derived from either droplet or flask cultures for bactericidal activity against different reporter cells (E. coli ECJW992, B. subtilis 3610, B. subtilis ATCC6633). The ‘+’ was assigned when the growth of at least one of the three reporter strains was inhibited by addition of the sample supernatant. The ‘−’ was assigned when none of the reporter strains was inhibited. In case no information about bactericidal activity is displayed, it was not tested. The scale bar of the first image applies to all images.