It is different. BAM  S relies on the inherent fluorescence (also known as "autofluorescence") emitted by the fluorophores in the cells of microorganisms, so there is no need to prepare samples to detect microorganisms. This is in contrast to the fluorescent dye-based technology, in which in order to detect microorganisms, the sample needs to be treated with reagents to emit a specific fluorescent signal. This process is embodied in common techniques such as ATP biofluorescence detection and flow cytometry detection.