Leukozytenemigrationsfördernde Wirkung von Crotonöl

Summary Various croton oil fractions were studied with regard to theirin vitro effect on leucocytes and their irritative action. It was discovered that there exist fractions exerting a stimulating effect on leucytic migration and an irritative action and other fractions having a leucocytic stimulating effect without pronounced irritative action. The co-carcinogenic fractions ofDanneel have no promotory effect on the migration of leucocytes.     

Löslichkeitserhöhung von Sulfonamiden durch Pektin

Summary The addition of pectin increases the water solubility of different sulfonamide compounds and salicylic acid. It should be emphasized that this effect is not only observed with the acid pectin but also with neutral sodium pectinate.     

Hydrobiologische Anstalt Plön der Max-Planck-Gesellschaft zur Förderung der Wissenschaften

Ohne Zusammenfassung     

Pilzkulturen auf Löschpapier

Summary It is possible to obtain good growth of fungi on blotting-paper-strips, if the strips are staying in beer-wort like the photo shows.     

Die Wirkung von synthetischen Antihistaminkörpern auf die Senfölchemosis am Kaninchenauge

Summary Intravenous or subcutaneous administration of pyribenzamine and other antihistaminics is able to decrease, and to delay the appearance of chemosis produced by mustard oils in the eye of the rabbit. Simultaneously occurring vascular reactions, on the other hand, are but slightly affected by antihistaminics. Intravenous or subcutaneous administration of rutin has no clear-cut effect on chemosis; it is however able to inhibit the vascular reaction.     

Zur Theorie des Föhns

Ohne ZusammenfassungOlten, den 9. November 1947.     

Über den Föhn

Ohne Zusammenfassung     

Zur Charakterisierung der Siebröhren-Kallose

Summary Callose of sieve plates from the phloem ofVitis vinifera is characterized by a high density of 1.62 and a refraction index of 1.532±0.002. The X-ray diffraction pattern yields 5 diffuse rings, the strongest of which indicates a periodicity of 15.5 Å.     

Zur Entstehung des Lungenödems

Ohne Zusammenfassung     

Erhöhung der Körpertemperatur vonPeriplaneta americana L. im Verlauf zweier Bakteriosen

Summary It is shown that two bacterial diseases ofPeriplaneta americana are accompanied by a significant increase of body temperature of the insect.     

Nachweis von organspezifischen Antikörpern

Summary Using a new nephelometric method, species-specific and organ-specific antibodies have been demonstrated. By means of the absorption technic organ-specific components of species-specific antibodies of high specificity have been determined in the serum of rabbits sensitized with various rat organs (heart, liver, kidney, tumor).

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Die Arbeit wurde mit Hilfe des Schweizerischen Nationalfonds zur Förderung der wissenschaftlichen Forschung durchgeführt.     

Hachweis von individualspezifischen Gewebsantikörpern

Summary Injection of homologous tissue or tissue extracts and homologous transplantation of skin in rabbits provoke the production of antibodies. By means of a new nephelometric method, acquired antibodies against homologous tissue circulating in the serum were found. This tissue-antibody seems to be an individual-specific one, reacting with all organs of the donor. The antibody is thermolabile and not dialysable.

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Die Arbeit wurde mit Hilfe des Schweizerischen Nationalfonds zur Förderung der wissenschaftlichen Forschung durchgeführt.     

Soziale Verhaltensweisen bei hörenden und gehörlosen Dompfaffen (Pyrrhula pyrrhula L.)

Summary The behaviour of bullfinches (Pyrrhula) after removal of the cochlea is studied. The influence of acoustical and optical stimuli upon the social contacts is compared. Parts of the social behaviour are controlled mainly acoustically, e.g. the attraction of a single bird by a calling fellow. Also the final raising of young birds is not possible without acoustical contacts between parents and offspring. The formation of pairs, however, nest-building, laying of fertilized eggs, and breeding are performed normally by birds without hearing. Also the social order within a group of bullfinches regulates itself without acoustical perception by its members. The alarming behaviour seems to be transferred within a group by optical signals.     

Experimentelle Untersuchungen über eine röntgenkymographische Methode zur Messung der Strömungsgeschwindigkeit des Blutes

Summary The röntgenokymographical measurement of the speed of flow of the blood is based on the observation that, with the Stumpf kymograph, progressive movements taking place longitudinally can be recorded with the same ease as periodically recurrent, sinusoid movements. From the time during which the kymograph operates, which can be read off the time relay, and a few measurable stretches of the kymogram defined in detail in the text, the speed of propagation of a directed process of movement can be calculated. If a drop of iodized oil traverses the vessel at the same speed as the blood, the speed of flow of the blood can be ascertained. In numerous tests on models not only was the practicability of the method as such proved, but more specialized conditions of flow in tubes of irregular lumen or having aneurysmal sacculations were examined. In this connection vortical formations are very clearly shown. The particular merit of this new röntgenokymographical method (flow kymography) is seen to reside in the fact that the cycle of speeds can be followed along a considerable length of vessel, and also that circumscribed alterations in speed within the part-sections examined can be anatomically localized. Experiments in the use of the method on human subjects are in preparation.     

Vergleichende röntgenhistoradiographische und interferenzmikroskopische Trockengewichts-bestimmungen

Summary Quantitative roentgen-histo-radiographic dry-weight determinations were made without a reference system. The results were compared to readings which had been obtained by the interference microscope. The readings from both methods correspond. The results show the range of error for both methods. It is remarkable that roentgenhisto-radiographic dry-weight determinations were made without using a reference system, once the dry-weight equivalent had been established.

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Mit Unterstützung der Deutschen Forschungsgemeinschaft.     

Mutationsauslösung beiDrosophila durch Äthylurethan

Summary Injection of sublethal doses of ethylurethane intoDrosophila melanogaster males increases the mutation rate for sex-linked lethals up to about 3.4%, as compared with 0.6% in the controls. In addition, several recessive and dominant visible mutations were obtained in the urethane series, while none were found in the control series. Up to the present there is no evidence for an induction of specific mutations by ethylurethane.     

Röntgenstrahlen und Aufbau der Materie

Summary X-rays have proved exceptionally useful in the investigation of the structure of matter, especially since the discovery of X-ray diffraction in crystals. A survey is given of the development of research into crystal structures and stress is laid on the value of the international co-operation achieved in this field. The use of X-ray diffraction, at first restricted to the determination of crystal structures, has in the course of time been extended far beyond the limits of crystallography. Today diffraction methods offer a widely applicable means of scientific research and one particularly adapted to the technical testing of materials. Further important applications of X-rays in science and technology are provided by radiography and X-ray spectroscopy.     

Zur Abhängigkeit der Aktivierungsenergie der Gewebsatmung bei Säugetieren von der Körpergrösse

Summary (1) The activation energy of the liver respiration in an interval of temperature between 17.5 and 37.5°C was determined in mice, rats, and guinea pigs. (2) A systematic decrease with increasing body size was observed.     

Notiz zur Vermehrungsrate der stabilen Bevölkerung

Summary A method for the calculation of the approximate value of the natural rate of increase is presented, when the maternity frequency of females is varied.