Acetylcholinesterase (E.C.3.1.1.7) in the skeletal muscle and brain of rats after exercise and long-term training.

The activity of acetylcholinesterase was determined in the skeletal muscle and brain of rats after one exercise (running) and after long-term training of definite programme. Enzyme activity was determined by the colorimetric method of Hestrin. The results were subjected to statistical analysis by the t test of Student.

Respiratory activity of different parts of small intestine in starved and fed animals.

Using the manometric method of Warburg the respiratory activity of tissue homogenates of the duodenum, jejunum and ileum was studied in starved and fed rats. The respiratory activity of mitochondria isolated from these parts of the small intestine was determined as well. The intensity of respiration was greatest in duodenal homogenates.