Nichtenzymatisch bedingte TNBT-Formazanablagerungen in Gewebsstrukturen

Summary Light- and electron-microscopic investigations reveal a non-enzymatic, non-specific deposition of TNBT-formazan in the sarcoplasma and along some membranes in the heart of the rat. These results are of interest with regard to the interpretation of histochemical identifications of oxidative ferments with TNBT as reduction-indicator.     

Die Veränderungen der Succinodehydrase-Aktivität in Detroit-6 (VA) Zellen,infolge der Infektion mit demHepatitis-infectiosa-Virus

Summary The inhibitory action ofHepatitis infectiosa virus on the SDH activity of Detroit-6 (VA) cell lines was investigated. The full inhibition of the SDH activity took place at the end of the third day after the infection. As this phenomenon precedes the cytopathogenetic effect of viral infection, it may be of some help in the early detection of the infection.     

Photoinactivation of ehrlich ascites tumor cells in vitro obtained with skin-photosensitizing furocoumarins

Riassunto Il liquido ascitico del tumore di Ehrlich, irradiato a 3655 Å in presenza di furocumarine «fotosensibilizzatrici cutanee» e cioè di psoralene o xantotoxina o bergaptene, perde la capacità di trasmettere il tumore nel topo.     

Acid-base equilibrium in the heart-lung preparation

Résumé Etude de l'équilibre acide-basique de la préparation cur-poumon de l'étourneau, réalisée avec la technique habituelle et les moyens de corriger les altérations constatées. La recherche des causes de ces altérations a permis de conclure que l'alcalose respiratoire est due à la ventilation dont on se sert habituellement, tandis que l'acidose métabolique est due à une production de métabolites acides déclanchés surtout par la saignée des animaux donneurs et par la glucolyse qui se produit à partir de l'extraction du sang et jusqu'au moment de son emploi dans la préparation.

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This work has been supported by a grant from the Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina.     

Regulation of tryptophan metabolism in the parasitic wasp,Habrobracon juglandis

Zusammenfassung Die Metabolite und 3 Enzyme des Tryptophanstoffwechsels vonHabrobracon weisen während der parasitären Phase sowie während der Puppenruhe und im Imaginalstadium signifikante Konzentrations-bzw. Aktivitätsveränderungen auf. Diese sind das Ergebnis mindestens zweier Regulationsmechanismen.

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I thank Prof.V. Schwartz and Prof.A. Egelhaaf for helpful advice.     

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Sul meccanismo di azione delle sostanze che modificano lo sviluppo embrionale

Summary The lithium chloride and the substances, which are capable of producing a similar effect on the embryo development, increase the viscosity of proteins from the Amphibian embryo. The sodium thiocyanate, the sodium iodide and the pyocyanine lower it. The proteins fractions which can appear in elongated particles are those which feel the action of the thiocyanate and of the pyocyanine.     

L'énergie atomique

Sans résumé     

Neuere Anschauungen über die Meteorologie und Klimatologie des Föhns

Summary The results of new researches about the föhn in the Swiss Alps in connection with the theory ofH. von Ficker show that the energy of the cyclonic föhn has two sources: the pressure gradient and the baroclinic field. This is caused by the isobaric differences of temperature between the Alps and the free atmosphere in the lee. The result is a current with a descending component in the lee. At the beginning, the descent of the föhn is due to the outstreaming of the cold air on the ground. In its further development the energy of the föhn increases so much as to sweep the cold air off the valleys.The development of föhn in an anticyclonic system ist also explained. Furthermore the two kinds of föhn are discussed in regard to their climatological influences.

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Physikalisch-Meteorologisches Observatorium Davos.