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  • 1935-1939  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Dissolved Carbon Dioxide and the Ripening of Tomatoes (1936)
    [s.l.] : Nature Publishing Group
    Nature 137 (1936), S. 704-705 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE phenomenon of climacteric rise in respiration of ripening fruits is not fully understood. Blackman and Parija1 explained the rise in respiratory activity in apples on the assumption that in the senescent stage a lowering of “hydrolysis-resistance” occurs leading to a greater ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/137704a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Centrifuging on Amæba proteus ( Y ) (1937)
    [s.l.] : Nature Publishing Group
    Nature 139 (1937), S. 675-675 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN Amæba proteus, the cytoplasmic bodies are the nutritive spheres, crystals, neutral red bodies, mitochondria, sudanophil fat and a single contractile vacuole. Fig. 1 illustrates the stratification of the various cytoplasmic components according to their specific gravity after ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/139675a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Lunar Eclipse on the Ionosphere (1936)
    [s.l.] : Nature Publishing Group
    Nature 137 (1936), S. 583-583 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FOR some time we have been studying the variation of height of the different layers of the ionosphere at different hours of the day and night by the well-known group-retardation method. The technique of Breit and Tuve1, with the later improvements suggested by Appleton and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/137583a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Longitudinal Magnetic Field on the Refractive Index and Conductivity of Ionized Air (1938)
    [s.l.] : Nature Publishing Group
    Nature 141 (1938), S. 511-512 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE experimental study of an ionized gas in presence of the magnetic field has recently acquired considerable importance in connexion with the ionosphere. Notable investigations have been made by several authors1,2,3,4,5 on the effect of the transverse magnetic field on the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/141511a0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Changes in Chloroplast Pigments in Leaves during Senescence (1937)
    [s.l.] : Nature Publishing Group
    Nature 140 (1937), S. 728-728 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Loss of chlorophyll in senescent leaves is a general phenomenon, and various views have been put forward to explain how chlorophyll disappears as the leaf yellows. The possibilities recognized are: (1) the decomposition of chlorophyll into its basic components and the transference of the latter ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/140728a0
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Chlorophyll Formation and Development of Photo-synthetic Activity in Juvenile Leaves of Mango ( Mangifera indica ) (1939)
    [s.l.] : Nature Publishing Group
    Nature 143 (1939), S. 161-162 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE question how far the development of photo-synthetic activity is concomitant with chlorophyll formation has not been definitely answered; the investigation in higher plants being mainly along two lines: (1) relationship between rates of photosynthesis and chlorophyll formation in leaves in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/143161c0
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  • 7
    Electronic Resource
    Electronic Resource
    Über einige Beobachtungen der Änderung der äquivalenten Höhen der Ionosphäre (1937)
    Springer
    The European physical journal 105 (1937), S. 309-318 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Mit elektrischen Wellen von 78 m Länge wird die Laufzeit des Echos von derE-Schicht gemessen. Die Höhe dieser Schicht nimmt in den Morgenstunden zu, was sich durch das Entstehen der niedrigeren D-Schicht erklären läßt. DieseD-Schicht muß aber ein ziemlich breites Ionisationsmaximum besitzen, denn nur so läßt sich die scheinbare Wegverlängerung und die wachsende Absorption erklären, die man bei Annäherung an die kritische Frequenz (140 m) dieser Schicht beobachtet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01330602
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  • 8
    Electronic Resource
    Electronic Resource
    A new method for the detection of carotenoids in chlorophyll samples (1938)
    Springer
    Protoplasma 30 (1938), S. 101-103 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A new method is developed for the detection of carotenoids in chlorophyll samples. The typical colour curve of chlorophyll in 80 % methyl alcohol exhibits marked absorption in 690μμ to 610μμ and less absorption in 500μμ to 430μμ. The colour curve of chlorophyll contaminated with carotenoids exhibits higher values in the region 530μμ to 430μμ. If carotin is present, the band maximum in the region 530μμ to 430μμ is located at 500μμ, and if xanthophyll is the impurity the band maximum is shifted to 430μμ. On a comparison of the colour curve of the sample to be tested with that of the typical colour curve of chlorophyll the presence of carotenoids at once becomes evident, and carotin and xanthophyll are identified separately by the positions of the band maxima in the region 500μμ to 430μμ. Carotenoids in as low a concentration as 0.05 % are detected by the new method described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01613720
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