Non-synaptic chemical neurotransmission

Summary Images with apparently gemmulofugal polarity in the EPL of the olfactory bulb are the result of sectioning, along misleading planes, gemmulopetal synapses containing postsynaptic vesicles. Unless one accepts a bidirectional conduction for chemical synapses, the internal granule cells lack actual gemmulofugal synapses and the neurotransmitter contained in their vesicles must act at non-synaptic membranes.Supported by grant MA4183 of the Medical Research Council of Canada.     

Spectral changes resulting from the interaction of some N-alkyl nitrosamines and rat liver microsomes

Summary Dimethyl (DMN) and diethyl nitrosamine (DEN) do not give characteristic spectral changes upon interaction with rat liver microsomes, while dipropyl (DPN) and dibutyl (DBN) nitrosamine cause type I spectral changes. The spectral binding constant is 100 mM for DPN and 1.17 mM for DBN. The maximal spectral change is 3.2×10⁶ and 1.0×10⁶ absorbance units per milligram protein for DPN and DBN respectively.Acknowledgment. This work was supported by Grants AM 13195-07 from the National Institute of Health (USA) and from the Consejo Nacional de Investigaciones Cientificas y Técnicas (Argentina).     

EEG synchronization produced by peripheral nerve stimulation

Riassunto La stimolazione a 3–8/sec di nervi cutanei e muscolari, eseguita in gatti integri non anestetizzati, produce una sincronizzazione dell'attività elettrica cerebrale. La soglia per questa risposta corrisponde in media a 0,4–0,9 volte l'intensità minima di corrente che applicata allo stesso nervo e in analoghe condizioni sperimentali produce la reazione di risveglio.

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This investigation was supported by PHS research grant B-2990 from the National Institute of Neurological Diseases and Blindness, N.I.H., Public Health Services, U.S.A.     

The importance of autoplastically transplanted pituitaries for survival and for regeneration of adultTriturus

Résumé Une hypophyse greffée autoplastiquement dans la chambre antérieure de l'il, dans lemanus ou dans letarsus s'est avérée capable de remplacer l'hypophysein situ dans son action sur la régénération et la survie chez le Triton, à condition que s'établisse une vascularisation satisfaisante du greffon et que la durée de l'expérience ne dépasse pas plusieurs mois.