Free Ammonia Levels Research Articles

The initial phase of excitation in absolute differentiation and the presence of free ammonia in the large cerebral hemispheres of rats

The use of Pavlov's conditioned reflex method combined with rapid fixation of intravital changes occurring in the free ammonia level of the large cerebral hemispheres of rats enabled us to discover variations in the brain metabolism already within the first 5 seconds of the absolute differentiation with various degrees of stability, the differentiation reactions being visually absolutely uniform in character. The absence of specific rise in the ammonia level in the brain during the first seconds of a particularly stable differentiation is evidently caused by a considerable shortening of the initial phase of excitation and the intensification of the inhibitory processes concentration.

Ammonia excretion by mammalian lung.

The intravenous administration of ammonium acetate to dogs results in measurable levels of free ammonia in expired air. Simultaneous measurement of the physiologic dead space permits the calculation of the partial pressure of ammonia in alveolar air. This finding has implications for ammonium metabolism and transport.