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A. R. SHETH, K. P. GUNAGA and SHANTA S. RAO

Summary.

The amylo-1,6-glucosidase activity of human seminal plasma was studied using its specific substrate, α-glucosyl Schardinger dextrin. The enzyme activity of semen is predominantly associated with the seminal plasma and proceeds at maximum velocity at pH 5·8 to 6·0. The secretions of seminal vesicles and testis seem to contribute most of the enzyme activity to the seminal plasma. Amylo-1,6-glucosidase activity is significantly lower in azoospermic samples as compared to those with a good sperm count.

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K. P. GUNAGA, A. R. SHETH and SHANTA S. RAO

Summary.

Testes of Wistar rats contain at least three organ-specific antigens as revealed by the gel diffusion analysis. Antiserum to rat testis absorbed with serum and liver cross-reacts with the extracts of epididymis, brain and ovary. Heating at over 60° C destroys the combining power of all the three testis-specific antigens. Two of the three organ-specific antigens of the Wistar strain of rats are common to two antigens present in the testes of man, sheep, rabbit, hamster, guinea-pig and mouse.

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K. P. GUNAGA, M. CHITRA RAO, A. R. SHETH and SHANTA S. RAO

Summary.

A study was carried out to assess the levels of glycogen and glycogen-degrading enzymes in rat testes from the fetal period to old age in order to elucidate the rôle of glycogen in gonadal maturation. Simultaneously, the capacity of the differentiating testes to secrete androgen was investigated using the maltase activity of the dorsolateral prostate as an index. High levels of glycogen and glycogen-degrading enzymes were observed to be present in the testes and dorsolateral prostate during fetal life. This suggests that glycogen serves as an important energy source for the testes during fetal development.