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PubMed1979

The effect of toluene on the hematopoietic system in newt Triturus cristatus.

A macrocytic hypocromic anemia was observed in newts after toluene inhalation, with 2 concentrations, for 6 weeks. Anemia resulted associated with the used dose of toluene. Erythroblast counts, performed on blood smears and on spleen and heart imprints, showed an erythropoietic stimulus during the first weeks of treatment followed by a depressed erythrostimulating action. Differential count of erythroblasts indicated a slow maturation induced by toluene on erythroblasts. An aplasia of the spleen was suggested on the basis of the results from 6 week-treated animals. A reduction in white blood cell count, associated with increased neutrophils and lymphocytopenia, occurred only in the animals treated with the higher concentration of toluene, after 5 and 6 weeks of treatment. A decrease of phagocytic activity of neutrophils, obtained with the in vitro assays, appeared the most relevant finding at the level of lekocyte compartment.

Anemia, Hypochromic↗
PubMedDate not supplied

[Effect of rhythmic and tonic stimulation on the neuronal activity of the olfactory bulb in the newt Triturus cristatus].

Studies have been made of the dependence of neuronal reactions in the olfactory bulb of the newt on the pattern of presentation of a test solution (glutamine 10(-5) M) into the nasal cavity. Responses to stimulation at a frequency 6/min (which corresponds to the minimal rhythm of normal buccal movements) varied in the intensity and sign. The peak of excitation was usually observed after the 2nd or the 3rd stimuli. The increase of stimulation frequency up to 12-24/min increased the number of the inhibitory reactions and the intensity of inhibition. Replacement of rhythmic flow by a constant one results in inhibition of 34% of neurones which reacted by activation to the rhythmic series of 6/min. The data obtained are discussed in relation to the pattern of olfactory perception in newts under natural conditions.

Animals↗