Morphological modifications in the adrenal medulla after decortications of different extent in the left cerebral hemisphere

Résumé Les cobayes avec destruction du cortex frontal gauche présentent, 2 h après l'application d'un stress douloureux, une morphologie médullosurrénal nettement différente entre la glande du côté gauche et droit. La médullaire gauche ne montre pas de modifications appréciables. Au contraire, la médullaire droite montre des modifications qui indiquent une réponse au stress douloureux.     

Unit responses of the lateral geniculate body to light flashes in free moving unrestrained cats

Riassunto È stata eseguita la registrazione di singole unità della parte dorsale del corpo genicolato laterale, in gatti non anestetizzati liberi di muoversi. Si dimostra che nella maggiore parte dei casi, le risposte ad un lampo di luce espresse in «spikes»/sec sono minime nel sonno sincronizzato, aumentano nella veglia e sono massime nel sonno desincronizzato. Qualora le risposte vengano riferite all'attività «spontanea» precedente il flash, il rapporto risposta-attività spontanea è maggiore nella veglia rispetto agli altri stati.

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The research reported in this document has been sponsored by the Air Force Office of Scientific Research through the European Office of Aerospace Research (OAR), United States Air Force Grant AF EOAR 67-7 and by the Consiglio Nazionale delle Ricerche.

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Moscow University, Chair of Higher Nervous Activity Physiology. Exchange Fellowship of the Italian Ministero degli Affari Esteri.     

Caryotypes de quelques hybrides interspécifiques dePitymys (Mammalia,Rodentia)

Summary The Robertsonian polymorphism ofPitymys subterraneus involves only 1 pair of metacentric autosomes. The crosses of forms with 52, 53 and 54 chromosomes do not show any differences in their reproductive rate. So a single autosome trivalent does not affect the fecondity. Many hybrids have been obtained betweenP. subterraneus (2N=52 or 54) andP. multiplex (2N=48) with 50 or 51 chromosomes, respectively. Even with a heterogenous karyotype they are not entirely sterile. 2 progeny were produced from back-crosses. The 2 parental species seem to result from recent speciation. Only fecondation or embryogenesis occurs in crossingP. duodecimcostatus withP. subterraneus orP. multiplex. The chromosome complement of 1 hybrid embryo ofP. duodecimcostatus (2N=62)×P. multiplex (2N=48) has been studied showing 55 chromosomes.P. duodecimcostatus appears to belong to a more distant evolutionary group.     

An effect of diet on homovanillic acid excretion

Zusammenfassung Reine Glukose-Diät führt zur Abnahme der Ausscheidung von Homovanillinsäure im Rattenharn. Die Abnahme trat auch dann ein, wenn keinerlei präformierte Homovanillinsäure im Rattenfutter nachgewiesen werden konnte.

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This work was performed at the Department of Physiology, Downstate Medical Center, Brooklyn, New York and was supported, in part, by grants from the USPHS NIH (No. HE-5148(04)) toA. Paes de Carvalho, from the Life Insurance Medical Research Fund (No. G61-26) toC. McC. Brooks and from the New York Heart Association toB. F. Hoffman.