Kalium-Austausch zwischen Plasma und Erythrozyten beim Karzinom

Summary The erythrocytes of mice inoculated with Ehrlich-ascites-tumor growing in the solid form interchange their potassium ions with those of the plasma at a more rapid rate than the erythrocytes of controls. This difference is also observed when the erythrocytes of tumor mice are incubated in normal plasma.When normal erythrocytes are incubated in plasma of tumor mice, an accelerated potassium interchange is also observed.

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Der Dank des Verfassers gilt Herrn Prof.G. v. Hevesy für sein förderndes Interesse und der Riksföreningen mot caucer für die Unterstützung dieser Untersuchungen.     

Änderung des Glukosetransports frischer menschlicher Erythrozyten bei längerer Inkubation

Summary Incubation of fresh defibrinated blood at 37°C increases the volume of red cells and decreases their permeation rate for glucose. The kinetics of sugar transport show direct proportionality between rate and the osmotic content of red cells. The measured volume changes and the changes of osmotic content calculated from the glucose permeation curves are in good agreement. Adenosine reconstitutes the increased volume and the decreased permeation rate in red cells. Therefore the decrease in permeation rate is explained by the increase in volume.     

Hemmung der experimentellen,testosteron-bedingten Epidermisproliferation an der weiblichen Ratte durch ein synthetisches Phenanthrenderivat mit antiandrogener Wirkung

Summary In the female rat, testosterone propionate-induced proliferation of the epidermis (acanthosis and mitotic activation) is inhibited in proportion to dosage by a phenanthrene derivative with antiandrogenic action.     

Eine einfache Aufbewahrungsweise von Erythrozyten mit gebundenen Antigenen für den Hämagglutinationstest

Résumé II est possible d'utiliser la formaline pour prolonger l'éficacité des érythrocytes sensibilisés par des antigènes protéiniques. Des résultats analogues peuvent même être obtenus avec des érythrocytes sensibilisés par des antigènes O polysaccharides deSalmonella typhi abdominalis.     

Zur Spezifität des durch Bradykinin,Kallidin und Met-Kallidin ausgelösten Blutdruckreflexes an der Katze

Summary Synthetic kinins (bradykinin, kallidin and met-kallidin) administered via the femoral artery in the isolated hindlimb of the cat elicits vasoconstriction, a reflex on the systemic blood pressure, a stimulation of respiration, and contraction of nictitating membrane. Acetylcholine elicits these reflex reactions in the body too. Atropine blocks this reflex, but not the reactions of kinins. Phenylbutazone administered via the femoral artery blocks the reflex reactions of acetylcholine and kinins as well as the vasoconstriction of histamine and the kinins in the isolated hindlimb. Phenylbutazone elicits by itself a reflex reaction. Of all the synthetic substances, the kinins are the most specific drugs inducing reflex reactions.     

Bildung von Reaktionsholz durch Zentrifugalbeschleunigung

Summary In leaning stems, reaction wood can be formed as a response to gravitation stimulus. In seedlings ofAesculus hippocastanum, reaction wood formation could likewise be stimulated by centrifugation. This proved the differentiation of wood cells to be affected by mass acceleration. The reaction wood formation is related quantitatively to mass accelerationb and timet, the formation of reaction wood being described by quantitative stimuli law as . The threshold of stimulation lies in the dimension . The arrangement of the experiments permits a direct approach to cambium physiology and the following differentiation of wood cells.     

Fasergabelung durch Auftreten lokalisierter Wachstumsbezirke

Summary The formation of forked fibres cannot be explained by the theories of sliding or of symplastic growth, while the theory of local apical growth of fibre ends accounts for all the actual facts observed in xylem and phloem fibres ofSparmannia africana. In this species cambium cells with a split end are found. These cells give rise to forked fibres, the forking point of which does not show any sliding growth, but remains on its original level. This evidence is undoubtedly a proof against the theory of sliding growth during fibre elongation inSparmannia.     

Produktion von Acetylmethylkarbinol durch Aktinomyzeten

Summary The production of acetylmethylcarbinol by various strains of actinomycetes was established. The biosynthesis of acetylmethylcarbinol depends largely on the composition of the fermentation medium and on the presence of arsenite, which regulates the metabolism of pyruvic acid. In the case ofStreptomyces aureofaciens the stimulating effect of phosphate on the production of acetylmethylcarbinol gives a partial explanation of the well-known negative effect of phosphate on the biosynthesis of chlortetracycline.     

Kennzeichnung mehrerer Individuen durch Kleinstschwingkreise

Summary An apparatus is described that permits the detection of, and discrimination between, 10 animals which carry miniature coils with different electromagnetic resonant frequencies.     

Agglutininbildung durch verschiedene Proteinfraktionen vonSalmonella ballerup

Summary The author has examined the agglutinogenic property of nucleoprotein and its components, the nucleic acid and proteins fromS. ballerup. The nucleoprotein was obtained by the extraction of fresh bacteria desintegrated by means of glass powder at pH 8.4 and precipitated with acetic acid at pH 4.6, and its components by splitting the nucleoprotein with 0.5% sodium carbonate at pH 5.5. The protein component was separated from the nucleic acid by forming a chloroform-proteingel. The protein component was submitted to a further purification by dissolving at pH 7 and precipitating at pH 5.5. Rabbits to whom 4–8 mg of the substance were given in 10–12 doses were used for the immunization. The agglutinins were determined byHeidelberger andKabat's quantitative method with aS. ballerup suspension. The maximum quantity of agglutinin is shown in mg nitrogen per 1 cm³ of serum. In comparison with the results obtained by the immunization with whole germs, it follows that, by means of nitrogen compounds, the nucleoprotein has the most substantial agglutinogenic effect, and the nucleic acid the poorest one.     

Freies Thyroxin im Serum durch Ultrafiltration

Summary A rapid determination of free thyroxine in human serum using¹²⁵J-thyroxine and pressure ultrafiltration is presented. Assaying per cent free thyroxine (PFT₄) more than 30 specimen/day can easily be established. The mean value of healthy controls is 0.030±0.010 (1 SD). Interference of results with height of pressure applied and duration of ultrafiltration resp. could not be detected. Both precision and sensitivity of this method allow further research and routine clinical employment.     

Separierbarkeit ebener Eibereiche durch eine Gerade

Summary If the sum of the circumferences of a finite number of convex domains is smaller than the circumference of the convex envelope, then there is a straight line who is separating the convex domains.     

Die Induktion lysogener Bakterien durch Nitrosamide

Summary N, N-dinitroso-N, N-dimethyloxamide and N, N-dinitroso-N, N-dimethylterephtal acid amide, both mutagenic for yeast cells, induce phage production by lysogenicEscherichia coli K12 () cells.     

Aufnahme von Ferrioxamin B durch Tomatenpflanzen

Summary Ferrioxamin B (FOB), an iron chelating cyclopeptide, is shown to be absorbed and translocated in tomato plants from nutrient solution. Chelated iron (FOB) is transported to the upper parts of tomato plants more rapidly than ionic iron (FeCl₃).     

Mikrobiologische Oxydation von Steroiden durch Cephalosporia

Summary It was found that members of the Cephalosporium species transform steroids under the known conditions of microbiological oxydation. Cephalosporium subverticillatum is able to produce ⁴-testoloactone from progesterone, but, in case of a longer fermentation period, ⁴-androsten-3, 17-dione can be isolated from the broth.     

Beeinflussung tierexperimenteller Leukopenien durch Vitamin A

Summary In high doses synthetic vitamin A proved to have a leucopoetic effect on the experimental leucopenia of rats. In the treatment of the succinylsulfathiazol leucopenia vitamin A does not equal the effect of folic acid, in the treatment of the milk leucopenia however it is superior to the latter.     

Mangelnde Reaktivierung reduzierter RNase durch Zajdela-Hepatom-Ascites-Zellen

Summary Decreased reactivation of inactivated RNase by microsomes from a hepatoma as compared to normal liver was observed and is described in more detail. This hampered reactivation of enzymes in general might be responsible for other enzyme deletions in tumours.     

Aufhebung der Knospenruhe von Reben durch Rindite

Summary Rindite and ethylene chlorhydrin have a promotive effect on breaking dormant buds of grape cuttings and of one year old pot-grown plants. The optimal dosis was approximately 6 mg Rindite per bud.