Elektronenmikroskopische Untersuchungen an den heterophilen Granulozyten des Haushuhns

Summary Ultra-thin sections of heterophil granulocytes of clinically healthy, laying hybrid-hens were examined by electron microscope. Within the cytoplasm of these cells, round, oval or fusiform granules (rods) of different electron density were found. Osmiophilic and electron light areas (cores) were seen, either together within the same granular body, or separately in different granules.     

Bestimmung des zeitlichen Verlaufes der Erschlaffung der kontraktilen Elemente mit Hilfe des Spannungs-Frequenz-Diagrammes

Summary By plotting the tension developed during maximal summation of muscle twitches against the stimulus interval, a curve can be drawn which has the same time course of the falling phase of the active state as determined by the method of quick release.     

Elektronenoptische Untersuchungen des Hauptstrom-Rauchkondensats der Partikelphase des Cigaretten- und Cigarrenrauchs

Summary Report on a method to produce, without refrigeration and solvents, a tobacco smoke condensate of the tobacco main-stream smoke of the particulate phase. Identification obtained by the electron fine beam diffraction of crystals in the sediment of the smoke condensate of cigarettes and cigars.

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Wissenschaftlicher Gast am Institut für Elektronenmikroskopie des Fritz-Haber-Instituts der Max-Planck-Gesellschaft.     

Hemmung der Azetylierungsfunktion des Coenzyms A

Summary It is demonstrated that the acetylation of sulfanilamide and of p-amino-azobenzene, in the presence of pigeon liver extract and coenzyme A, is not only inhibited by -phenyl fatty acids but also by a considerable number of other substances. The most effective inhibitors contain at least two benzene nuclei and one acidic group (phenolic hydroxyl or a carboxyl group).     

Zur Ausschaltung des Becquereleffektes in der Elektroretinographie

Summary Distortion of the electroretinogram by Becquerel effect may be excluded by using carbon rod instead of metallic wire in connecting the electrode.     

Proliferationen der Fischepidermis nach der Einwirkung von inhibitoren des glykolytischen Energiestoffwechsels

Summary When fluoride-ions or monoiodoacetate is added to the ambient medium, there occur in fish larvae after 12 h, and in eels after 24 h, in some places, solid epidermal proliferations. The effect of glycolysis inhibitors on epidermal mitotic activity might be due to an impairment of energy metabolism as it is nullified by a simultaneous application of inorganic diphosphate or by doubled O₂ partial pressure of 320 mm Hg.     

Zur Frage der thermoelastischen Eigenschaften des Nerven

Summary The thermo-elastic properties of nerve have been studied by measurements of the change in length caused by changes in temperature. The thermal coefficient (per °C) of linear expansion, always positive in sign, is of the order of 10^–4 for intact nerve and 10^–5 for dissected nerve.     

Das Verhalten des Wasserstoffs in der Sonnenkorona

Ohne Zusammenfassung     

Eine Methode zur Bestimmung des Endpunktes der Sol-Gel-Umwandlung bei der Plasmagerinnung

Summary In order to measure the clotting time of blood plasma the sol-gel transformation is observed. The process is retarded with mol/18 of 1,4-oxyphenyl-sulfonate. A lowering of the prothrombin content of 50% results in a difference of time against normal values of 45–55 sec., compared with 3–4 sec. with the method ofQuick.     

Besonderheiten im Feinbau des Endothels der Rattenpfortader

Summary After perfusion of the rat portal vein with the plasmaexpander Haemaccel, the morphological findings suggest an active transport of this material by means of cytopempsis. Moreover, the until now rarely described existence of microtubules in vascular endothelia could be confirmed. Their function might be that of a cytoskeleton.     

Das allgemeine Bauprinzip des Lamellarsystems der Chloroplasten

Summary The lamellar system of chloroplasts consists of close double lamellae. In electronphotomicrographs, the walls of two adjacent double lamellae can be seen as one thick lamella. Because of this, the lamellae in the inner portion of a lamellar packet appear about twice as thick as those at the boundary of the packet and, in chloroplasts that contain grana, the granalamellae appear twice as thick as the stromalamellae.

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Mit Unterstützung der Deutschen Forschungsgemeinschaft.     

Tagesperiodik des O2-Umsatzes der Rattenleber

Summary There is a 24 h periodicity of the rat liver tissue respiration (Qo₂) with maximal values at about 07.30 h and minimal values at about 17.00 h.

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Auslandsstipendiat der Schweizerischen Regierung (1963/64).

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Die Arbeit wurde unterstützt von der Max-Planck-Gesellschaft zur Förderung der Wissenschaften, Deutschland.     

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     

Membrandepolarisation der Muskelfasern des Öffnermuskels des Flusskrebses auf Nervenreiz und Kaliumapplikation

Summary Three groups of fibres with different EPSP were differentiated in the claw-opening muscle of crayfish. Small and late depolarization of the deep fibres was observed on application of 3–4 times the normal concentration of KCl.

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Mit Unterstützung der Deutschen Forschungsgemeinschaft.     

Die Wirkung des Toluidinblaus und der Thrombokinase auf den Vorgang der Thrombininaktivierung

Summary The disappearance of thrombin—formed in the blood, or added to serum-follows a manomolecular reaction-type. Heparin increases the reaction-velocity of this thrombin-inactivating process.Our investigation established that toluidine blue or kinase, which, according to the literature, bind heparin, strongly reduce the speed of thrombin-inactivation too. Therefore the heparin-binding capacity of these substances is also manifested in the decrease of thrombin-inactivation.     

Histochemische Untersuchungen zur Natur der Cytoplasma-Einschlüsse des Lungentumors der Maus

Résumé Dans une étude histochimique on a montré que les inclusions cytoplasmiques des tumeurs pulmonaires de la souris (Klärner etGieseking) contenaient une polysaccharide neutre jointe à l'acide ribonucléique. Les résultats ont été discutés au sens d'une hypothèse virale.     

Die absteigenden Verbindungen der Sehrinde des HalbaffenGalago crassicaudatus

Summary After experimental lesions inGalago crassicaudatus, the cortico-efferent fibres of the optical cortex were studied using theNauta andGlees methods. Mainly 4 different systems were separated: Corticocaudate, pontine, geniculate and pulvinar.