These include the development of a microscope operating with ultraviolet light (together with his colleague Moritz von Rohr), pioneering what would become the starting point for fluorescence microscopy, and the discovery of grid illumination, a method that would later be used in the treatment of tumors.
These include the creation of a microscope employing ultraviolet light (alongside Moritz von Rohr), initiating what would later become the basis for fluorescence microscopy, and the discovery of grid illumination, which was utilized in tumor treatment.