Effects of Purines and Pyrimidines on the Fungistatic Activity of 5-Fluorocytosine in Aspergillus Species
1977
The ability of some exogenously supplied purines, pyrimidines, and their nucleosides to antagonize the in vitro fungistatic activity of 5-fluorocytosine (5-FC) in Aspergillus species was examined. All compounds tested except thymidine were capable of altering the minimal inhibitory concentration of 5-FC for seven strains of aspergilli tested. In most instances, there was a reciprocal correlation between the ability of a compound to antagonize the fungistatic activity of 5-FC and the quantity of 5-FC taken up by cells in the presence of the compound over a 72-h period.
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