SIDNEY SHJIRIN AND NATHAN O. KAPLAN 



155 



FLUORESCENCE OF 3-AMINOPYRlDlNE -DPN 



PROPYLENE GLYCOL 



EXCIT. 



340 m/i ) 



^330m/x) 



360 380 400 420 440 460 480 500 



WAVELENGTH (m/i) 



Fig. 9. Fluorescence spectra of 3-aminopyridine-DPN in HoO and in propylene 

 glycol. The fluorescence spectrum of aminopyridine-DPN, 4 X 1^"* ^' i" water 

 and in propylene glycol, shown using the wavelengths of maximum excitation. 

 These spectra were taken at room temperature. 



Nevertheless, by comparing properties of various analogues it may 

 be possible to learn more about intramolecular interactions in J^yri- 

 dine nucleotides and intermolecular forces with enzymes. 



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