FIG. 3.

Effects of exposure to UV radiations (UVC lamp, right panels) and heat (70°C, left panels) on viability of a marine bacterioplankton community, measured with the NADS protocol (•), with the electron chain respiratory activity probe (CTC⁺; ○), and with a radioactive tracer commonly used to measure bacterial production (leucine incorporation; □). Two samples are shown, an untouched marine sample and the same sample after having been filtered through a polycarbonate 0.8-μm filter. Results are expressed as percentages of the initial value and are the averages for two replicated experiments ± standard errors.