Neuere Probleme der Abstammungslehre

Ohne Zusammenfassung

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Reviews

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Nouveaux livres

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Recensioni

     

Geschlechtsabhängige Grössenunterschiede der Mitochondrien in der Zona fasciculata der Nebennierenrinde der Ratte

Summary Diameters of mitochondria of the external zona fasciculata of the adrenal cortex of 4 female and 4 male Sprague-Dawley-rats are determined with the image analyzing computer Quantimet 720. On the average females have significantly larger mitochondria. The mitochondria show an ellipsoid deformation, the long axes are orientated parallel to the columns of the zona fasciculata.     

Die Treffermethode in der Messung der Parathyreozyten-Aktivität nach der Epiphysektomie

Résumé Par l'application de la méthode d'intégration aux points sur les clichés électronomicroscopiques, on a constaté l'hypertrophie des organelles cellulaires (mitochondries, le réticulum endoplasmique et l'appareil de Golgi) dans les cellules parathyroïdiennes de rats sacrifiés trois semaines après l'épiphysectomie.     

Eine sauerstoffundurchlässige Zone in der Wand der Arteria carotis der Katze

Summary By means of local pO₂ measurements with Pt-needle electrodes an oxygen impermeable zone in the arteria carotis of the cat has been found.     

Zur Frage der Natur der Ablagerungen in den Gichtknoten

Summary A gout-tophus, which we examined by X-rays and micro-crystallographic methods was definitely proved to be a deposit of monosodiumurate-monohydrate in the form of crystals which could just be detected under the microscope.     

Zur Frage der Natur der Ablagerungen in den Gichtknoten

Summary The spectrum of the aurora of April 17, 1947, exhibited again the forbidden line 5199 Å of the nitrogen atom and confirmed the long duration of this excitation calculated on the basis of theory at 5 hours.     

Zur Lokalisation der Östrogenproduktion in der menschlichen Plazenta

Summary The syncytial sprouts of the human placenta were found to give a distinctly stronger reaction for glucose-6-phosphat-dehydrogenase, DPNH-diaphorase and steroid-3--ol-dehydrogenase than other regions of the trophoblastic syncytium. Besides they show a more intensive basophilic reaction and higher contents of fat than other parts of the syncytium. Therefore the syncytial sprouts can be regarded as the areas of the trophoblastic syncytium that are specialized for estrogen production.

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Herrn Prof. Dr.K. Goerttler zu seinem 70. Geburtstag gewidmet. — Mit Unterstützung durch die Deutsche Forschungsgemeinschaft.     

Zur Kristallstruktur der Mineralien der Chabasit- und der Faujasitgruppe

Summary Preliminary results are given on the structure of faujasite and gmelinite.     

Bestimmung der Zahl aktiver Zentren der Acetylcholinesterase in motorischen Endplatten

Summary ³²P or¹⁴C-labelled diisopropyl-fluoro-phosphate (DFP) was bound to endplates of mouse diaphragms by incubation. The number of molecules was determined by densitometric measurement of autoradiographs. One endplate contains 2.4·10⁷ active centres for acetylcholine, blocked by DFP. The turnover time for acetylcholine is very short: 15µsec.     

Aus der Chemie der Naturstoffe

Summary This lecture was held in Zürich to commemorate the 70^th birthday of Prof.Paul Karrer; it briefly outlines his life-work as a scientist and then reviews, in greater detail, some of his important work in various fields: vegetable dyestuffs (carotenoids), vitamins (particularly vitamins A, E and K) and curare alkaloids.As is the purpose of this lecture, a review is also given of the author's own work: ergot alkaloids and their derivatives; cardiac glycosides of squill, digitalis etc.; and finally, the most recent results of research on chlorophyll — the crystallization of natural chlorophylla andb after many years of endeavour.

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ErstePaul-Karrer-Vorlesung, gehalten im Rahmen der öffentlichen Feier zum 70. Geburtstag von Prof.Paul Karrer, am 25. April 1959 in der Aula der Universität Zürich.     

Entwicklung und Probleme der Schnee- und Gletscherkunde in der Schweiz

Ohne ZusammenfassungAbteilung für Erdbauforschung der Versuchsanstalt für Wasserbau an der ETH.     

Zur Methodik der elektrophoretischen Untersuchung der Proteine der Speicheldrüsensekrete

Summary Several methods have been studied for concentrating the human saliva in order to get reliable electrophoresis patterns. The best method is a dialysis in a cellophane tube against veronal buffer (pH 8.2) followed by vacuum exsiccation.     

Zum Problem der Nahrungspflanzenwahl der Aphiden

Summary OnAllium schoenoprasum L. andPoa pratensis L., two species that do not belong to the host plants ofMegoura viciae Buckt., this aphid pierces the sievetubes as in its natural host,Vicia faba L. In none of these plants do the aphids take up³²P from the parenchyma. Presumably phloem-sucking aphids probe, before finally settling in the sieve-tubes of the plant, to recognize the quality of the plant.     

Geschwindigkeit der Nervenleitung innerhalb der Netzhaut

Summary The conduction velocity of the unmyelinated portion of the optic nerve fibres within the cat's retina was measured by shifting a microelectrode from the blind spot outwards and stimulating antidromically in the lateral geniculate body. The mean conduction velocities were 2.8 m/s for the fast, and 1.7 m/s for the slow group of optic nerve fibres, as compared with maxima of 70 and 23 m/s respectively for the same groups in the myelinated extrabulbar portion.     

Motive und Probleme der Arithmetisierung der Mathematik in der ersten Hälfte des 19. Jahrhunderts — Cauchys Analysis in der Sicht des Mathematikers Martin Ohm

Ohne Zusammenfassung Vorgelegt von C. J. Scriba     

Unterschiede der ATPase-Hemmung durch Azid in weissen und roten Muskelfasern der Ratte

Summary With a simple test — inhibition of the Mg-activated ATPase in a total homogenate of muscle by azide — it is possible to distinguish clearly between red and white muscle fibres. A number of muscles of the pelvic and thigh region of the rat are investigated by this method.     

Interzelluläre Verbindungen beim Plattenepithelkarzinom der menschlichen Haut in der Gewebekultur

Summary A new medium was developed for tissue-culturing of the human squamous cell carcinoma of the skin. The morphology of the outgrowing tumour cells is described, particularly with regard to the projections of cell surface. There are 2 forms to be differentiated: one which is similar to the desmosomes of the normal epithelium of the skin, and one of intercellular connective strands. The different functions of both forms are discussed with regard to the exchange of cell matter.