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  • Springer  (60)
  • Wiley  (36)
  • Nature Publishing Group  (10)
  • American Economic Association  (4)
  • American Meteorological Society (AMS)
  • 2020-2021
  • 2005-2009  (70)
  • 1955-1959  (9)
  • 1950-1954  (14)
  • 1935-1939  (17)
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  • 1
    Publication Date: 2006-01-01
    Print ISSN: 2330-1635
    Electronic ISSN: 2330-1643
    Topics: Computer Science , Information Science and Librarianship
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  • 2
    ISSN: 1545-9985
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] The small t antigen (ST) of DNA tumor virus SV40 facilitates cellular transformation by disrupting the functions of protein phosphatase 2A (PP2A) through a poorly defined mechanism. The crystal structure of the core domain of SV40 ST bound to the scaffolding subunit of human PP2A reveals that the ...
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature structural & molecular biology 13 (2006), S. 861-862 
    ISSN: 1545-9985
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] It is often said that nature loves symmetry. Occasionally, however, nature makes important use of asymmetry. A striking example of this appears in the structure of the ligand-binding domains of a bacterial quorum-sensing receptor complex recently reported by Neiditch et al. The authors propose that ...
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature biotechnology 25 (2007), S. 173-177 
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] Envenomation by snakebite is a ubiquitous problem, as there are poisonous snakes in every continent and almost every country (Table 1). Although arthropod stings constitute the most common cause of envenoming by animals, around 80% of deaths by envenomation worldwide are caused by ...
    Type of Medium: Electronic Resource
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  • 5
    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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  • 6
    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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  • 7
    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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  • 8
    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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  • 9
    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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  • 10
    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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