Abstract
The activity of succinic dehydrogenase, adenosine triphosphatase, acid and alkaline phosphatase, lipase and nonspecific esterases in 12 tumors of the orbital region of cattle was studied.
The succinic dehydrogenase activity was not significantly different in papillomas and fibromas, as compared with that of the normal tissues of origin of the tumors. Topographical distribution of adenosine triphosphatase was directly correlated with the cell multiplication process, and thus with the tissues' needs for an energetic basis. The activity of adenosine triphosphatase and alkaline phosphatase was enhanced in the region of proliferating capillaries, and this was interpreted to indicate the tendency of these tumors to malignancy. The activity of lipase and the nonspecific esterases showed nonspecific oscillations in papillomas and fibromas as compared with that in the normal tissues.