Time -- a key in experimental and practical medicine.

This paper gives an overview on circadian rhythms which governs visibly all biological features. By illustrative examples of circadian rhythms of man and experimental animals it is shown that: 1. The components of all tissues, organs, and blood undergo circadian changes, manifested in drmatic morphologic and chemical differences.

Circadian rhythms of the endocrine pancreas. A quantitative biochemical and immumocytochemical study.

Cellular hormone levels of insulin and glucagon in the endocrine pancreas of the rat have been observed and quantified over the 24-hours period, at 3-hourly intervals, by T.V. image conversion analysis on immunocytochemical preparations.

The fate of injected human IgG in the mouse liver: Uptake, immunological inactivation, and lysosomal reactions.

1. Human IgG is stored in the form of remarkable droplets in the cytoplasm of mouse hepatocytes following intravenous injection. 2.