Activity of two components of serum ribonuclease under conditions of physical exercise.

Serum ribonuclease activity before and after physical exercise in healthy persons was estimated. It is found that a work load of 6000 kgm/5 min increased ribonuclease activity measured at pH 8.5 and decreased the activity of the same enzyme measured at pH 7.0 in the presence of Zn SO4. The observed changes were more pronounced in untrained than in trained persons.     

Myopathic changes at the end-plate region induced by neostigmine methylsulfate.

Administration of large dose of neostigmine caused very quickly marked myopathic changes at the motor end-plate region. With continued injections, however, some recovery of the structural features did occur suggesting the reconstructive changes in the affected regions.     

Tsetse fly Glossina morsitans morsitans produces ultrasound related to behavior.

The spectrum of the sounds produced by the tsetse fly Glossina morsitans morsitans extends to above 80 kHz and the energy distribution between 20 and 70 kHz is related to behavior.     

Sexual steroids and monamine metabolism during gestation.

The experiments show influence of progesterone and estradiol on regulation of enzymes of monamine metabolism, MAO and COMP during pregnancy. Both the hormones inhibit enzymes MAO and COMPT in the adrenals when determined at 0 h parturition. Estradiol has stronger inhibitory effect than progesterone. The results provide evidence for important endocrine implication during pregnancy for processes of monamine regulation.