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Figure 1
(a) The mercury vapor lamp spectrum of the light source, XtalLight 100, used for the experiments (source spectrum). (b) Transmission spectrum of the 385 nm short-pass interference filter applied to remove visible light from the source spectrum. (c) Transmission spectrum of the UV glass absorption filter applied to remove remaining visible light, especially of wavelengths above 670 nm which can permit the short-pass 385 nm filter. (d) Calculated spectrum of the light source after filtering the so-called illumination spectrum. The illumination spectrum has been calculated by multiplication of the unfiltered mercury arc lamp emission spectrum with the transmission spectra of the UV-transparent glass filter (UG-filter) and the the short-pass 385 nm filter and the permeability of glass cover slips.

Journal logoSTRUCTURAL BIOLOGY
COMMUNICATIONS
ISSN: 2053-230X
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