Chemical/rmaceutical/Environment/ Agriculture: ⢠Membrane impermeant, nanthridinium intercalator dye excited by mercury or xenon-arc lamps or argon-ion laser. Suitable for use in fluorescence microscopy, confocal laser scanning microscopy, flow cytometry, and fluorometry. Used as a nuclear counterstain. ⢠Applications include chemistry/biochemistry, medicine, environmental monitoring. For instance, they are used to measure chloroll fluorescence to investigate plant siology.