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  • Wiley-Blackwell  (41)
  • Springer  (25)
  • National Academy of Sciences  (14)
  • Nature Publishing Group  (7)
  • American Meteorological Society (AMS)
  • 1955-1959  (8)
  • 1950-1954  (10)
  • 1935-1939  (69)
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Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 165 (1950), S. 852-853 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Working with baker's yeast2 and with E. coli3, we have shown that the inhibition of respiration caused by trypaflavine is reversed not only by hydrogen ions, but also by different mono-, di- and ter-valent cations (K+, Na+, Mg++, Ca++, La+++) and by non-inhibiting organic cations such as spermine4. ...
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 170 (1952), S. 423-423 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It is tentatively suggested that this phenomenon may be due to the fact that barium sulphate has a hydrophilic surface (method of Davis and Curt is1), and that it will consequently tend to aggregate so as to present to the benzene the minimum surface per unit volume. In this respect the phenomenon ...
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  • 3
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Structural alterations in chromosomes resembling those produced by polyfunctional nitrogen mustards can be readily obtained in proliferative cells treated with monofunctional compounds. In one set of experiments, root tips of Allium cepa were exposed to solutions of two agents with more than one ...
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 116-117 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have attempted the fractionation of the same irradiated material (given to us by Dr. H. M. Rozen-daal, General Electric Research Laboratories, Sche-nectady) and have isolated from it several compounds. About 20 per cent of the original L-tryptophan is transformed by the radiation into a complex ...
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 173 (1954), S. 589-590 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The N1 and N2 radiations are usually very much stronger than X4,363. The photographic measurement of the intensity of X4,363 with respect to Hy and i?(3 is not difficult ; but photographic photometry is not well suited to the measurement of the ratio, R, of the intensity of Nx + N2 to that of ...
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 44 (1956), S. 760-769 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Verfasser haben eine semimikro- und eine mikrogravimetrische Methode und ein spektrophotometrisches Verfahren zur Bestimmung von Calcium mit Loretin (7-Jod-8-hydroxychinolin-5-sulfonsäure) ausgearbeitet. Nach Festlegung des Umrechnungsfaktors des Calciumloretinats auf gravimetrischem und thermogravimetrischem Wege wurde gezeigt, daß durch Semimikrogravimetrie Calciummengen von 5 bis 50 mg mit einem mittleren Fehler von 0,35% bestimmbar sind. Die mikrogravimetrische Methode eignet sieh für 0,2 mg Calcium/ml mit einem mittleren Fehler von 0,45%. Der Einfluß einer Reihe von Fremdionen wurde untersucht. Die meisten davon stören nicht, auch wenn sie in bedeutender Menge vorhanden sind. Durch indirekte Spektrophotometrie, nämlich durch Auflösen des Calciumloretinats in überschüssiger Eisen(III)lösung gelang es, Calciummengen in der Größenordnung von 20μg mit einem mittleren Fehler von 0,35% zu bestimmen.
    Abstract: Summary The authors have elaborated a method (semi-micro and micro-gravimetric) and also a spectrophotometric method for determining calcium by means of loretin. After establishing the analytical factor for calcium loretinate by the gravimetric and the thermogravimetric methods, they showed the possibility of determining calcium on the semimicro gravimetric scale for quantities ranging from 5 mg to 50 mg, the mean error being 0.35%. The microgravimetric method allows the minimum quantity to be determined to be reduced to 0.2 mg calcium per ml, the mean error being 0.45%. A study was made of the influence of a number of foreign ions. Most of them do not harm the determination, even though they are present in considerable amounts. By indirect spectrophotometry, notably by dissolving the calcium loretinate in an excess of ferric solution, the writers have succeeded in determining amounts of calcium of the order of 20μg with a mean error of 0.35%.
    Notes: Résumé Les auteurs ont élaboré une méthode semi-micro et micro-gravimétrique et une méthode spectrophotométrique pour le dosage du calcium par la lorétine. Après avoir établi le facteur analytique du lorétinate de calcium par voie gravimétrique et thermogravimétrique, ils ont démontré la possibilité de doser le calcium à l'échelle semi-micro gravimétrique pour des quantités allant de 5 mg à 50 mg, l'erreur moyenne étant de 0,35%. La méthode microgravimétrique permet de ramener la quantité minima à doser à 0,2 mg de calcium par ml, l'erreur moyenne étant de 0,45%. L'influence d'une série d'ions étrangers fut étudiée. La plupart ne gênent pas le dosage, même s'ils sont présents en quantités importantes. Par spectrophotométrie indirecte, notamment en redissolvant le lorétinate de calcium dans un excès d'une solution ferrique, les auteurs ont réussi à doser des quantités de calcium de l'ordre de 20μg avec une erreur moyenne de 0,35%.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 41 (1953), S. 89-118 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es werden etwa 70 mikrochemische und andere Apparate beschrieben, die in den vergangenen 10 Jahren entwickelt wurden. Es handelt sich hierbei um Geräte zum Rühren u. dgl., Einrichtungen für die anorganische qualitative Analyse, Apparate für organische Zwecke, für elektrochemische und volumetrische Verfahren und für verschiedene andere Bedürfnisse.
    Abstract: Résumé On décrit environ 70 articles relatifs à l'appareillage microchimique et général mis au point pendant les 10 dernières années. L'appareillage est classé en 6 sections, c'est-à-dire, dispositifs pour l'agitation et ce qui s'y rapporte, pour l'analyse qualitative minérale, l'appareillage organique, les techniques électrochimiques, l'appareillage pour Volumétrie et des dispositifs variés.
    Notes: Summary About 70 pieces of microchemical and general apparatus developed during the past 10 years are described. The apparatus is classified in 6 sections, viz. stirring and allied devices, equipment for inorganic qualitative analysis, organic apparatus, electrochemical techniques, volumetric apparatus, and miscellaneous devices.
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  • 8
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] AS part of a broad programme1 in search of materials which retard growth of transplantable neoplasms in animals, a crude nitrate from a culture of a Streptomyces was selected for test against sarcoma 180, because of earlier results against Erro scelestus in eggs2, and was found to possess potent ...
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 168 (1951), S. 150-153 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] AS part of a study, by two of us (P. D'A. H. and R. J. W. R.), of factors influencing the susceptibility of mice to experimental tuberculosis, methods of altering the body lipids were sought. For this purpose a new technique1"3, by which the blood cholesterol and phospholipids could be maintained ...
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 5 (1954), S. 168-172 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Zusammenfassung Für eine programmgesteuerte Rechenmaschine mit einer magnetischen Trommel als Speicher wird ein für den allgemeinen Gebrauch geeignetes Verzeichnis der arithmetischen Befehle gegeben und der logische Aufbau des Rechenwerks beschrieben. Vorgesehen ist das Rechnen sowohl mit gleitendem Komma (Zahlen der Forma·10 b ) als mit festem Komma, was das automatische Berechnen von Rechenplänen sowie das Rechnen mit verdoppelter Stellenzahl gestattet.
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