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Due to UW-Madison campus access restrictions the ICE office will remain closed through July 13. The ICE Online Store will reopen on July 13 but only for limited service because of the restricted access to our facilities. Beginning July 13 ICE will process and ship SMALL orders once a week. We will aim for a processing time of 5-10 business days from receipt of order to shipping, operating within the constraints of very limited access. We apologize for any inconvenience and thank you for your patience and understanding as we work through a partial re-opening. If you have questions, please contact us by email at We will try to respond within 48 hours.

DNA Optical Transform (X-Ray Diffraction) Transparencies

DNA Optical Transform (X-Ray Diffraction) Transparencies

Type: CP, D, I    |    Level: AP, Coll

When students have a DNA Optical Transform (X-Ray Diffraction) Transparency and laser pointer, simulating Rosalind Franklin’s famous X-ray diffraction experiment that led to the discovery of the DNA double helix becomes a hands-on activity. Students see the diffraction patterns by shining a laser through the transparency and projecting the patterns onto a screen or wall. Transparencies are available individually or in sets of 5 or 10.

A source of visible laser light is not included, but any laser pointer will work. To use these transparencies effectively you need one copy of the DNA Optical Transform (X-Ray Diffraction) Kit which includes directions.

Note: as of January 2011 the DNA Diffraction Transparencies have been updated. The new transparencies are laser photo plotted at a higher resolution which allows us to better model the true structure of B-DNA. As a result you will find that the diffraction pattern of B-DNA (cell J) is different from that produced by the old diffraction transparencies, but is a more accurate representation of DNA's structure. The manual has been updated accordingly; please refer to it for more information.