QX3 Digital Image Gallery
This organochlorine insecticide can be considered as the pesticide of the greatest historical significance, due to its effect on the environment, agriculture, and human health. First synthesized by a German graduate student in 1873, it was rediscovered by Dr. Paul Mueller, a Swiss entomologist, in 1939 while searching for a long-lasting insecticide for the clothes moth. DDT subsequently proved to be extremely effective against flies and mosquitoes, ultimately leading to the award of the Nobel Prize in medicine for Dr. Mueller in 1948. Effective January 1, 1973 the Environmental Protection Agency (EPA) officially canceled all uses of DDT, but not before more than 1 billion kilograms of DDT had been introduced into the United States. Like Endosulfan, DDT disrupts the delicate balance of sodium and potassium within neurons. The pesticide is effective against a wide spectrum of insects in the agricultural arena and also mosquitoes that transmit malaria and yellow fever as well as body lice that carry typhus.
DDT at 200x Magnification
DDT at 60x Magnification
DDT at 60x Magnification
Polarized light images were captured using an Intel Play QX3 computer microscope modified for crossed polarized illumination. Additional light was applied to the specimens using light pipes from a Dolan-Jenner Model 180 fiber optics illuminator containing a 150 watt projection lamp. A 5/16-inch hole was drilled into the light mixing chamber at the base of the microscope and the light pipe was pointed towards the far wall of the chamber to increase illumination.
Questions or comments? Send us an email.
© 1995-2015 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.
The QX3 microscope design is copyrighted © 1999 by Mattel, Inc. Intel® Play™ is a registered trademark of the Intel Corporation. These companies reserve all of their rights and privileges under copyright law. The material contained in this website is solely the opinion of the authors and is intended for eduational use only.
Last Modification Friday, Nov 13, 2015 at 01:19 PM
Access Count Since December 24, 1999: 12905
Visit the official Intel Play website:
Visit the websites of our partners in education: