[1] [1] Q. Li, T. Ruckstuhl, S. Seeger, "Deep-UV laserbased fluorescence lifetime imaging microscopy of single molecules," J. Phys. Chem. B 108, 8324-8329 (2004).

[2] [2] Q. Li, S. Seeger, "Label-free detection of single protein molecules using deep UV fluorescence lifetime microscopy," Anal. Chem. 78, 2732-2737 (2006).

[3] [3] M. Schüttpelz, C. Müller, H. Neuweiler, M. Sauer, "UV fluorescence lifetime imaging microscopy: A label-free method for detection and quantification of protein interactions," Anal. Chem. 78, 663-669 (2006).

[4] [4] T. A. Smith, C. N. Lincoln, D. K. Bird, Time- Resolved Fluorescence in Microscopy, in Fluorescence Applications in Biotechnology and Life Sciences, E. M. Goldys, Ed., Chap. 10, pp. 195-221, Wiley-Blackwell (2009).

[5] [5] C. J. R. van der Oord, Confocal Imaging and Microvolume Spectroscopy Using Synchrotron Radiation, Cip-Data Koninklijke Bibliotheek, Den Haag (1994).

[6] [6] C. J. de Grauw, H. C. Gerritsen, "Multiple timegate module for fluorescence lifetime imaging," Appl. Spectr. 55, 670-678 (2001).

[7] [7] X. T. Hao, L. M. Hirvonen, T. A. Smith, Nanomorphology of polythiophene-fullerene bulk-heterojunction films investigated by structured illumination optical imaging and time-resolved confocal microscopy, (submitted).

[8] [8] M. G. L. Gustafson, D. A. Agard, J. W. Sedat, Threedimensional and multidimensional microscopy: Image acquisition processing VI, Vol. 3919, in Proc. SPIE, J.-A. Conchelo, C. J. Cogswel, T. Wilson, Eds., pp. 141-150 (2000).

[9] [9] R. Heintzmann, T. M. Jovin, C. Cremer, "Saturated patterned excitation microscopy — a concept for optical resolution improvement," J. Opt. Soc. Am. A 19, 1599-1609 (2002).

[10] [10] D. K. Bird, A. L. Schneider, A. Watkinson, B. Finnin, T. A. Smith, "Navigating transdermal diffusion with multiphoton fluorescence lifetime imaging," J. Microscopy. 230, 61-69 (2008).

[11] [11] T. A. Smith, C. N. Lincoln, Determination of 2-Photon Absorption Cross-Section of Tryptophan, unpublished.

[12] [12] M. Lippitz, W. Erker, H. Decker, K. E. van Holde, T. Basche, "Two-photon excitation microscopy of tryptophan-containing proteins," Proc. Natl. Acad. Sci. 99, 2772-2777 (2002).

[13] [13] G. Mocz, Intrinsic fluorescence of proteins and peptides, available at http://dwb.unl.edu/Teacher/ NSF/C08/C08Links/pps99.cryst.bbk.ac.uk/projects/ gmocz/fluor.htm. (2012).

[14] [14] D. R. Graham, K. W. Statham, "Trptophan in wool. Part 1: Determination of the tryptophan contect of wool," Text. Res. J. 30, 136-139 (1960).