Affiliation:
1. School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA. All authors contributed equally to this work.
Abstract
Tryptophan and serotonin were imaged with infrared illumination by three-photon excitation (3PE) of their native ultraviolet (UV) fluorescence. This technique, established by 3PE cross section measurements of tryptophan and the monoamines serotonin and dopamine, circumvents the limitations imposed by photodamage, scattering, and indiscriminate background encountered in other UV microscopies. Three-dimensionally resolved images are presented along with measurements of the serotonin concentration (∼50 mM) and content (up to ∼5 × 10
8
molecules) of individual secretory granules.
Publisher
American Association for the Advancement of Science (AAAS)
Cited by
414 articles.
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