Experimental dissociation between hippocampal theta activity in wakefulness and hippocampal theta activity in paradoxal sleep in the rat]

The effects of electrolytic lesion of the septum on the theta activity of the dorsal hippocampus were studied in the chronically implanted Rat during wakefulness and paradoxical sleep. The experimental results show that depending on its localization, septal lesion can either: (1) eliminate the wakefulness theta rhythm without suppressing that of paradoxical sleep; (2) eliminate the paradoxical sleep theta rhythm without suppressing that of wakefulness. These results suggest that there are two kinds of theta activity having different anatomophysiological bases and a different functional significance: one associated with wakefulness and the other with paradoxical sleep.     

Sex differences in blocking thyroid radioiodine uptake in mice

Zusammenfassung Weibliche und männliche Mäuse unterscheiden sich nach Vorbehandlung mit Schilddrüsenhormonen in der Aufnahme von Jod-131.     

Interrelationship between the thyroid gland and sympathetic function

Resumen Se estudió en ratas Wistar macho, el efecto de la triiodotironina y el¹³¹I sobre el contenido y concentración noradrenalina y adrenalina, en glándula submaxilar y corazón. Se estudió también, el efecto del isoproterenol sobre el glucógeno de ambos órganos en animales controles e hipotiroideos experimentales. Se observó un comportamiento diferente en los depósitos de noradrenalina y adrenalina en los órganos estudiados. La triiodotironina produjo una disminución en la liberación o catabolismo de las catecolaminas y el¹³¹I parece causar el efecto opuesto y una disminución de la sensibilidad de los recptores adrenérgicos.

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We wish to thank the Consejo Nacional de Investigaciones Cientícas y Técnicas de la República Argentina, for providing a grant and to express out gratitude to Laboratories Glaxo (Bs. As.) for providing thyroid hormones.     

Occurrence of mitochondrial monoamine oxidase in human semen.

Mitochondrial monoamine oxidase (MAO) was found in human semen, showing its Km and Vmax values of 91.7 microM and 290 pmoles/mg of protein/60 min, respectively, with kynuramine as substrate. A major part of the activity was due to type A MAO.