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By Robert B. Green (auth.)

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18, 333 (1979) 52. : Biopolymers 1,401 (1963) 53. Sloper, R. , Tuscott, I. , Land, E. : Photochem. Photobiol. 29, 1025 (1979) 54. Smith, K. : J. Invest. Dermat. 77, 2 (1981) 55. Shank, C. , Ippen, E. , Bersohn, R. : Science 193, 50 (1976) 56. Greene, B. , Hochstrasser, R. , Weisman, R. , Eaton, W. : Proc. Nat. Acad. Sci. USA 75, 5255 (1978) 57. Noe, L. , Eisert, W. , Rentzepis, P. : ibid. 75, 573 (1978) 58. Martin, J. : in ref. [9], pp. 223 59. Friedman, J. , Lyons, K. B. : in ref. [9], pp. 195 60.

9) as). 1 Nucleic Acids Nucleic acids store and transmit genetic information and regulate metabolism in living cells. The genetic code is represented in the sequence of bases in the desoxyribonucleic acid (DNA) helix (Fig. 10). hotomultiplier Dye laser 1 ,1 Blocking filter 13 II' Ii Cut-off filter I 12 Beam splitter To pulse dividing electronic / Fluorescence celt L Wavelength tuning element dou bling crystal {KDP, LFM, KB5) Photodiode Io Fig. 7. g. of the bases) is dit~cult to be measured at room temperature and at neutral pH, since the fluorescence quantum yield lies in the range 10 -4 to 10 -5 .

_J,/ Optical ~' delay line Fig. 19. Block diagram for a two-step photoionization a3~ population of complex 1 due to its faster decay. Thus, complex 2 will be more damaged. If % < ~T (XT: triplet lifetime), complex 1 will be more damaged. Since xl < x2, the intersystem crossing rate and therefore the triplet-state population will be larger for complex 1 than for complex 2. Assumably the ground-state absorption cross section and the triplet-state lifetime XT are the same for the two complexes 83).

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