Über Optik und Feinbau des Pektins und seiner Derivate

Summary Investigations on fibres and folies of pectin show its negative double refraction (Eigendoppelbrechung). According to the X-ray diagrams the demethoxylated specimens «crystallize» in a higher degree than the original pectin. Calculations seem to support the hypothesis of folded chains.     

Über die Reaktion der höheren und tieferen Reizbildungszentren des isolierten Herzens auf Temperatursenkung

Summary In the isolated rabbit heart perfused by the Langendorff method total heart block has been produced by section of the His bundle. The influence of cooling of the perfusion fluid upon higher and lower automatic centers was studied. The sinoauricular pacemaker responded to cooling with a much greater decrease of the heart rate than did the ventricular automatism. The responsiveness of the atrioventricular node to cooling lay between that of the two others.     

Über die Reizung des Ferntastsinns bei Fischen und Amphibien

Summary Fishes and aquatic amphibians are able to detect and locate moving bodies and even obstacles at some distance by means of their lateral-line sense organs (Ferntastsinn). As was shown experimentally, the main physical process involved in these reactions are certain local damming phenomena in front of the moving object (rise of pressure, displacement of water particles). Obstacles cause an alteration of the damming phenomena produced by the moving animal's body itself (increase of water resistance).Kramer's different view is rejected; he overlooked the existence of damming phenomena and was not aware of the fact thatXenopus laevis reacts to surface waves even when the animal is totally submerged.     

Über die Kristallstruktur des Azulens

Résumé La structure du réseau spatial de l'azulène cristallisé a été déterminée à l'aide des rayons X. Les valeurs des constantes du réseau sont en général les mêmes que celles trouvées parMisch etvan der Wyk. Au contraire, la statistique des interférences observées montre des différences importantes et conduit au groupe spatial P 2₁/a, à la place de P 2₁ et P 2₁/m indiqué par les auteurs cités.

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Erstmals hergestellt vonPl. A. Plattner undA. St. Pfau, Helv. chim. acta20, 224 (1937).     

Über die Konstitution des Tribrom-koprostanons

Summary In the literature has been described that the further bromination of 4,4-dibromo-koprostanon results in the formation of a 2,4,4-tribromo-koprostanon. In this paper it is shown that the tribromo-compound obtained from koprostanon is a2,4,6-tribromo-cholestenon.     

Über die Konstitution des Lactaroviolins

Summary Results of partial hydrogenation support the assumption that lactaroviolin belongs to the azulen group.     

Über die Atmungsenzyme des Seeigeleies

Riassunto Le attività citocroma ossidasica, succino-deidrogenasica, DPNH e TPNH cit. c riduttasica sono state studiate in omogenati e frazioni mitocondriali e microsomiali di uova vergini e fecondate diParacentrotus lividus. I mitocondri contengono tutta l'attività citocromossidasica e succinodeidrogenasica, mentre i microsomi solo una metà della attività DPNH cit. c riduttasica totale. Spettri differenziali hanno rivelato la presenza, nei microsomi, di un citocromo avente una banda a 428–430 mµ.     

Über die Konstitution des Sempervirins

Résumé En conclusion de quelques nouvelles réactions et de la mesure de son spectre d'absorption, la formule I est proposée pour la Sempervirine C₁₉H₁₆N₂, l'alcaloïde jaune deGelsemium sempervirens.     

Über die Konstitution des Visamminols

Summary The structure of Visamminol (I), a compound isolated fromAmmi visnaga bySmith, Pucci, andBywater, has been elucidated by degradation and by a comparison of the UV.-spectra of I and its derivatives with those of other chromones.     

Über die mechanische Klanganalyse des Ohrs

Summary The author shows mathematically and experimentally, that a mechanical frequency-analysis in the cochlea is possiblewithout resonance and that the yielding and damping of the basilar membrane are determinative.     

Über die 1-Peptidasen des Tuberkelbazillus

Ohne Zusammenfassung     

Über die polarographische Bestimmung des Cl'-Ions

Ohne Zusammenfassung     

Über die Einwirkung des Schilddrüsenhormons auf die Ossifikation

Summary Larvae ofSalamandra salamandra quadrivirgata Dürigen and tadpoles ofXenopus laevis Daud, treated with a percutaneous application of thyroxin, show a more intensive calcification of their skeletal system after a precocious metamorphosis. The calcified area of bones is increased; additional centres of calcification can be distinguished in quite a number of other skeletal elements. By thyroxin-soaked agar implants in the hindlimbs ofAmbystoma mexicanum, deposition of calcium salts is furthered in the bones of the leg treated, as well as in the adjacent pelvic girdle, thus demonstrating that the thyroid hormone exerts a direct effect upon calcification. It is supposed that during normal metamorphosis the thyroid gland plays an equal part in the process of calcification in the skeletal system.