Inhibition of tumorigenesis by topical application of low doses of vitamin A acid and fluorouracil

Zusammenfassung Reihenuntersuchung zur Prüfung der Beeinflussung der Tumorgenese beim Kaninchen durch Vitamin A und Fluorouracil. Mit Hautbepinselung von Dimethylbenzanthracen erzeugte Tumoren werden sowohl durch Vitamin A wie durch die Kombination Vitamin A+5-FU in Wachstum und Neubildung beeinflusst.     

Conditioning of depressor responses evoked by single volleys in the aortic nerve

Summary Depressor responses evoked by single volleys in the aortic nerve are more facilitated by conditioning volleys exciting C fibers in the same aortic nerve than in the contralateral one. Conditioning volleys in A fibers do not facilitate the testing depressor responses.     

Relationship between the resting blood pressure and depressor responses evoked by compression of the eyeballs

Résumé Les corrélations entre le niveau de repos de la pression artérielle et le degré des effets dépressifs provoqués par la compression des yeux sont positives. Leur valeur dépend de l'intensité de la stimulation. Elle atteint son maximum à une intensité semblable à celle qui conditionne la plus forte amplification des réactions étudiées.     

Inhibition of immediate hypersensitivity responses in flatfish

Résumé Comme le cromoglycate disodique et la diéthylcarbamazine (qui ne sont pas des antistaminiques) inhibent la réaction d'hypersensibilité immédiate chezPleuronectes platessa à la suite d'une injection intradermique d'extraits fungiques, il semble que les médiateurs autres que l'histamine peuvent être impliqués.     

Modification of visual,auditory, and somatosensory evoked responses in cortical primary receiving areas by nigral stimulation

Zusammenfassung Nachweis einer «unspezifischen» fördernden Wirkung von Stimulation der Substantia nigra auf «evoked potential» in den primären sensorischen Zentren des Grosshirns.

---

---

Supported by a grant from the Japanese Ministry of Education.

---

Acknowledgment. We thank Prof.N. Kato, Prof.Y. Iwase, Dr.S. Takahashi, and Dr.N. Tani for their help.     

Respiratory responses in heat-exposed rabbits: Inhibition of tachypnoea offset by increase in tidal volume

Summary Rabbits in which thermal panting has been inhibiting by previous cold exposure or by water deprivation respond to a raised ambient temperature with an increase in tidal volume. By so doing, they are able to maintain a minute volume appropriate to their thermoregulatory requirements.     

Influence of the visual cortex upon collicular evoked responses in the rabbit

Summary In rabbit, the depression of the visual cortex by KCl showed an enhancement of the collicular evoked potentials. This enhancement revealed that the visual cortex had exerted a tonic type influence upon the superior colliculus. M. Dubuc was supported by training grant No. 217-617-489 of the Ministère de l'Education du Québec.     

Inhibition of sodium transport in frog skin by cardiac glycosides of different molecular structure

p 19-OM no- . ; — .     

Effects of D-alpha-aminoadipate on physiologically evoked responses of cat dorsal horn neurones.

Microelectrophoretic administration of D-alpha-aminoadipate reversibly reduced excitatory responses of cat dorsal horn neurones evoked by iontophoretic glutamate and non-noxious peripheral stimuli but did not influence similar responses evoked by noxious peripheral stimuli or iontophoretic substance P.     

Influence of the visual cortex upon collicular evoked responses in the rabbit.

In rabbit, the depression of the visual cortex by KCl showed an enhancement of the collicular evoked potentials. This enhancement revealed that the visual cortex had exerted a tonic type influence upon the superior colliculus.     

The effects of glycine on the rabbit retina: Averaged ERG and averaged visual evoked responses

Résumé L'injection intravitréenne de Glycine (0.005 et 0.002 g) chez le lapin entraîne l'abolition des potentiels oscillatoires de l'ERG moyenné photopique, phénomène réversible en 12–24 h. La Glycine exerce probablement un effet inhibiteur sur l'électrogenèse des potentiels oscillatoires.     

Opposite responses of muscle circulation to different emotional stimuli

Résumé La circulation musculaire du chat est influencée par les situations émotives: la vue d'un autre chat, agresseur, cause une vasoconstriction de nature adrénergique, tandis que la vue d'un chien cause une vasodilatation de nature cholinergique.

---

---

On leave from the Department of Psychology, University of California, Los Angeles (California, USA).     

Antidromic responses evoked in the central end of the phrenic nerve by stimulation of the ipsilateral dorsal column in the cat]

In 15 adult cats under nembutal anaesthesia the dorsal columns have been stimulated at the level of the first and the second cervical segments. Under these conditions antidromically evoked responses appear both on the ipsilateral radial and phrenic nerves. Some of the afferent phrenic fibres thus activated may be related to the diaphragm muscle receptors. In some experiments a group of thin fibres (conduction velocity comprised between 16-20 m/sec) were also activated.     

Inhibition of nuclear and mitochondrial respiration by arsenite

Résumé La respiration des noyaux isolés du thymus de rat est inhibée par l'arsénite à une concentration 10 fois supérieure à celle qui inhibe la respiration mitochondriale. Ce fait suggère, une difficulté de pénétration à travers la membrane nucleaire et ne rend pas compte de la différence entre le méchanisme de la phosphorylation oxydative des noyaux et celle des mitochondria.     

Inhibition of DNA synthesis by lidocaine and procaine

Zusammenfassung Nachweis, dass in Ehrlich-Ascites-Zellen die DNS-Synthese durch Lokalanaesthetika stärker gehemmt wird als die RNS- und die Proteinsynthese.     

Existence of different populations of unitary evoked postsynaptic potentials at the frog neuromuscular junction]

The postsynaptic response to monoquantic evoked transmitter release (mean quantal content about 0.3) has been studied at temperatures from 10 to 23 degrees C. The delay between nerve stimulation (1 to 10 Hz) and the unitary postsynaptic potentials fluctuates by steps. The existence of preferential delay sites can always be detected (mean number 13.5 +/- 3.1). Identical delay unitary postsynaptic potentials often shows identical amplitude and identical time to peak. These results suggest that few emitting sites are preferentially activated along the nerve terminal at low level release during long lasting stimulation. The "single process" assumption used in statistical studies of transmitter release is probably oversimplified.