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The activity of adenosine deaminase (ADA) was determined in serum and pleural fluid of 90 patients with pleural effusions of various aetiology. Tuberculous pleural effusions, empyemas and rheumatoid pleural effusions demonstrated significantly higher activities of ADA than parapneumonic, nonspecific and malignant pleural effusions and effusions in systemic lupus erythematosus and congestive heart failure. In tuberculosis, empyema and rheumatoid arthritis ADA activity was significantly higher in pleural fluid than in serum, indicating a local synthesis of ADA by cells within the pleural cavity in these diseases.

4). In the uterus of the rat glycogen synthesis is catalyzed by phosphorylase from G-1-P and not through the UDPG pathway. Since the morphology and physiology of smooth muscle and skeletal muscle are not the same the difference in the metabolic pathway for synthesis of glycogen is not surprising. It is possible that smooth muscle cells of organs that are not stimulated by ovarian hormones can behave in a different way from the smooth muscle cells of the uterus.Summary. UDPG-glycogen synthetase was not demonstrated in the uterus of the ovariectomized or in the ovariectomized-hormone treated rats. However, in the tongue the enzyme was present. The results show that glycogen of the rat uterus is not synthesized through the UDPG pathway. The results also demonstrate a difference in glycogen synthesis between the smooth muscle of the uterus and skeletal muscle of the tongue.The authors are grateful to Dr. Warren N. Dannenburg, Dept. of Obstetrics and Gynecology Research, for helpful discussions during the investigation.1. Stetten, D., Stetten, M., Physiol. Rev., 1960, v40, 505.

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