Nuremberg Compound Microscope (circa 1744)


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DDT Movies

DDT Video No. 1 - DDT crystallization is observed under polarized light illumination at a magnification of 20x in this video. Playing time is 12.5 seconds. Choose a playback format that matches your connection speed: 28.8k (modem), 56.6k (modem), or T1/Cable/DSL, or download this video clip in MPEG format (5.21 MB).

DDT Video No. 2 - DDT crystallization is observed under polarized light illumination at a magnification of 10x in this video. Playing time is 8.5 seconds. Choose a playback format that matches your connection speed: 28.8k (modem), 56.6k (modem), or T1/Cable/DSL, or download this video clip in MPEG format (3.56 MB).

DDT Video No. 3 - DDT crystallization is observed under polarized light illumination at a magnification of 10x in this video. Playing time is 11.8 seconds. Choose a playback format that matches your connection speed: 28.8k (modem), 56.6k (modem), or T1/Cable/DSL, or download this video clip in MPEG format (4.91 MB).

DDT Video No. 4 - DDT crystallization is observed under polarized light illumination at a magnification of 20x in this video. Playing time is 10.8 seconds. Choose a playback format that matches your connection speed: 28.8k (modem), 56.6k (modem), or T1/Cable/DSL, or download this video clip in MPEG format (4.54 MB).

DDT Video No. 5 - DDT crystallization is observed under polarized light illumination at a magnification of 10x in this video. Playing time is 12.1 seconds. Choose a playback format that matches your connection speed: 28.8k (modem), 56.6k (modem), or T1/Cable/DSL, or download this video clip in MPEG format (5.06 MB).

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.

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