Abstract
1. 1. Adenosine metabolizing enzymes in seminal plasma of man and bull have been investigated. 2. 2. A different level of 5′-nucleotidase activity has been found in two seminal plasmas: in bull 5′-nucleotidase represents 80% of the total AMP dephosphorylating enzymes while in man 5′-nucleotidase represents only 1.3% of the total AMP dephosphorylating activities. 3. 3. Apart from the different levels of 5′-nucleotidase activity, different kinetic parameters have been reported for 5′-nucleotidase, acid prostatic phosphatases, ADA and PNP. 4. 4. Adenosine kinase, xanthine oxidase and AdoHcy-hydrolase have not been detected in the seminal plasma of man and bull.
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