Visit the
Molecular Expressions Website

Photo Gallery
Silicon Zoo
Chip Shots
Screen Savers
Web Resources
Java Microscopy
Win Wallpaper
Mac Wallpaper
Custom Photos
Image Use
Contact Us

Johan Sebastiaan Ploem

Born August 25, 1927 in Sumatra, Indonesia, Johan Ploem moved with his family to the Netherlands when he was only 2 years old, where he remained for the rest of his youth. He received his education at the University of Utrecht in the Netherlands, Harvard University, and the University of Amsterdam. He has since been employed by a number of academic institutions, including the University of Miami, the University of Amsterdam, and the University of Leiden.

The renowned scientist has been a physician, educator and researcher, but is most famous for his invention of the epi-illumination cube used in fluorescence microscopy. Ploem's vertical illuminator bears his name and is commonly used today. The design consists of an excitation filter, dichroic mirror (or beamsplitter), and a barrier (or emission) filter housed together in a small cube. In addition to solving lighting problems previously incurred in fluorescence microscopy, Ploem's illumination cube has made it a simple process to change fluorescence filter combinations by rotating a knob or translating a lever.

For his contributions to the practice of microscopy, Ploem has received various honors. He was elected as a fellow of the Papanicolaou Cancer Research Institute in 1977 and was a recipient of the C. E. Alken Foundation award in 1982. He is also a member of the Society of Analytical Cytology, the Dutch Society of Cytology, the International Academy of Cytology and the Royal Microscopical Society, for which he served as president in 1986.


Questions or comments? Send us an email.
© 1995-2022 by Michael W. Davidson and The Florida State University. All Rights Reserved. No images, graphics, software, scripts, or applets may be reproduced or used in any manner without permission from the copyright holders. Use of this website means you agree to all of the Legal Terms and Conditions set forth by the owners.
This website is maintained by our
Graphics & Web Programming Team
in collaboration with Optical Microscopy at the
National High Magnetic Field Laboratory.
Last Modification Friday, Nov 13, 2015 at 02:19 PM
Access Count Since December 19, 2002: 34453
Visit the websites of our partners in education: