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  • Springer Nature  (835)
  • Springer  (630)
  • 1945-1949  (1,465)
  • 1
    Publication Date: 1949-06-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 3 (1947), S. 489-490 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Mit Hilfe eines neuen Rhodiumpolyvinylalkohol-Katalysators wurde der Mechanismus katalytischer Hydrierungen und Dehydrierungen untersucht. Aus den mitgeteilten Versuchsergebnissen geht hervor, daß molekularer Wasserstoff durch Rhodiumionisiert wird, während mit Palladiumatomarer Wasserstoff gebildet wird. Bei der Untersuchung von Dehydrierungen wurde festgestellt, daß diese Reaktionen in Gegenwart von elementarem Schwefel beschleunigt werden. Der Schwefel wirkt entweder als Wasserstoffakzeptor oder nimmt an einer Komplexbildung teil.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 4 (1948), S. 478-480 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary By differential centrifugation of rat-liver homogenates prepared in isotonic solutions of mannitol it is possible to obtain mitochondria in suspensions that are apparently free from other cellular components. Our preparation contains all of the enzymes responsible for the conversion of ornithine to citrulline with glutamic acid and ammonium or glutamine. The synthesis is strongly inhibited by Janus green, which is a specific vital stain for mitochondria.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 36 (1949), S. 349-352 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Antonie van Leeuwenhoek 14 (1948), S. 97-125 
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. Cereal straw was partially hydrolyzed with dilute sulphuric or hydrochloric acid at elevated temperatures, yielding about 20% of matter assimilable byTorulopsis utilis (calculated on oven-dry straw), which consisted chiefly of xylose, with small amounts of glucose and acetic acid. 2. Experiments on a laboratory scale with non-fermentable substrates like ethanol and acetic acid showed that also in these cases an ample aeration is an essential condition for a good yield. 3. Acetic acid is harmful to the yeast, even in small concentrations, when the pH is lower than 5.0. 4. Small quantities of glucose or acetic acid stimulate the conversion of xylose byTorulopsis utilis. 5. With an adequate aeration and an initial pH of 5.5–6.0 (maintained at this level until the acetic acid has disappeared and then lowered to 4.0–4.5) satisfactory conversion rates and yields could be obtained on straw extracts as mentioned sub 1. 6. The results of the laboratory experiments mentioned sub 5 could be reproduced in a semi-technical installation with a capacity of 200 l straw extract. 7. Good results were obtained in this installation with aVogelbusch aeration device, while foaming could be adequately controlled by means of a rotating wire screen.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    De economist 95 (1947), S. 742-752 
    ISSN: 1572-9982
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 111 (1948), S. 133-135 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 34 (1948), S. 1-14 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Verbindungen von 18 Aminosäuren mit 2-Nitroindandion-1,3 (2-Nitro-1,3-diketohydrinden) wurden hergestellt und analysiert. An 15 dieser Verbindungen wurden auch kristalloptische Daten ermittelt. Mikrophotographien der Kristalle aller dieser Verbindungen und des Reagens selbst sind angeschlossen. Zur Identifizierung der Aminosäuren mit Hilfe der kristalloptischen Konstanten der Verbindungen mit dem Reagens wird eine kleine Menge der Aminosäure mit einer gesättigten Lösung des Nitroindandions behandelt. Die Mischung wird auf dem Objektträger erwärmt und die sich bildenden Kristalle werden trocken gesaugt und schließlich über einer Mikroflamme sorgfältig getrocknet. Die Brechungsindizes werden dann unter dem Polarisationsmikroskop bestimmt. Die folgenden Aminosäuren erlauben eine eindeutige Bestimmung der optischen Eigenschaften und können mit Sicherheit erkannt werden:d-l-Alanin,l-Asparaginsäure,l-Cystein,d-Glutaminsäure, Glycin,l-Histidine,l-Oxyprolin, 3,5-Dijod-l-tyrosin,d-Isoleucin,d-Lysin,l-Prolin,d-l-Serin undd-l-Valin.
    Notes: Summary Derivatives of 18 amino acids with 2-nitroindandion-1,3 have been prepared and analyzed. The optical crystallographic data have been determined for 15 of these new compounds. Photo-micrographs of these nitroindandionates have been made. Several of the compounds prepared did not form crystals of sufficient size to accurately determine all of the optical properties. This condition was especially true with the compounds obtained from arginine, phenylalanine, methionine, and tryptophane. A method of identification of various amino acids based on the optical-crystallographic properties has been proposed. This identification can be carried out on a microscope slide with very small amounts of material. The derivatives of nitroindandion are not entirely satisfactory for identification in several instances because of the high values of the indices and because of the solubility of several of the derivatives.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 34 (1949), S. 235-240 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Zur Kennzeichnung von Evipan (1-5-Dimethyl-5-⊲1-cyclohexenylbarbitursäure), Numal (5-Allyl-5-Isopropylbarbitursäure) und Phanodorm (5-Cyclohexenyl-5-aethylbarbitursäure) wurden Benzylderivate hergestellt und analysiert. Die kristalloptischen Kennzeichen wurden für sechzehn dieser neuen Derivate bestimmt. Die meisten Derivate des Evipans wurden als Öle erhalten und verblieben — mit Ausnahme desp-Nitrobenzylderivates — in diesem Zustande. Die optischen Eigenschaften der Derivate der drei genannten Barbitursäureabkömmlinge unterscheiden sich genügend voneinander, um die Identifizierung der Säuren mit Hilfe der kristalloptischen Daten zu gestatten.
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