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For several years the Authors have found that the skin-photosensitizing furocoumarins photoreact with the nucleic acids, especially with native DNA, by irradiation at 365 nm. The studies of these photoreactions revealed that a C-cyclo-addition reaction takes place between pyrimidine bases and furocoumarins. Pyrimidine bases photoreact always with their 5,6—double bond, while furocoumarins can covalently bind engaging either their 4', 5' or their 3,4-double bond or both the 4', 5'- and 3,4-double...
Continuando gli studi sulla presenza nelle urine umane di sostanze attivanti e inibenti la chinureninasi e la chinurenin transaminasi, enzimi piridossal fosfato-dipendenti che regolano il metabolismo del triptofano, sono stati isolati e identificati tre agenti attivanti. Le urine di uomini sani di 20-24 anni tenuti a dieta normale dopo acidificazione hanno fornito estratti eterei ed esanici che sono stati sottoposti a ripetute cromatografie con vari adsorbenti ed eluenti. Si sono ottenuti in forma...
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