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 various parts of the small intestine in fasted and fed animals. Part II. Respiratory activity of the small intestine in guinea pigs.

The aim of this work was to investigate the respiratory activity of three parts of the small intestine: duodenum, jejunum and ileum in guinea pigs, to compare the intensity of oxygen consumption by these parts in hungry and fed animals, and to find possible differences in the intensity of intestinal respiration between guinea pigs and rats. In guinea pigs the intensity of respiration of intestinal homogenates was nearly twice smaller than in rats. similarly, however, as in rats intestinal homogenates of guinea pigs had greater respiration intensity after feeding than while the animals were fasting.

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.

Effect of skeletal muscle denervaton on the activity of muscular acetylcholinesterase (E.C. 3.1.) in frog.

The activity of acetylcholinesterase (AChE 3.1.1.