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  • Springer  (257)
  • Wiley-Blackwell  (131)
  • 1985-1989  (343)
  • 1930-1934  (45)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Biometric studies on the bivalvesAstarte elliptica, A. borealis andA. montagui in Kiel Bay (Western Baltic Sea) (1985)
    Springer
    Helgoland marine research 39 (1985), S. 245-253 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The threeAstarte species were studied in June 1983 at two sites in Kiel Bay, “Süderfahrt” and “Schleimünde”, at 20 m depth. Shell length to live wet weight correlations are given for all three species; forA. elliptica also shell-free dry weight, shell dry weight, ash-free dry weight of the soft body and ash-free dry weight of the shell are recorded as functions of the shell length. In the logarithmic length/weight regression analysis the coefficients of slope forA. elliptica andA. borealis are 3. ForA. montagui, that coefficient is significantly greater than 3. Weight conversion factors, calculated forA. elliptica, revealed a mean weight composition of 31.5 % water in the mantle cavity and tissue water, 64.5 % shell ash, 2.1 % organic content of shell, 1.7 % organic content of the soft body and 0.4 % ash of the soft body. An isometric growth of shell length and shell breadth is confirmed forA. borealis, whileA. montagui exhibits positive allometric shell growth and changes its shape during life.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01992772
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  • 2
    Electronic Resource
    Electronic Resource
    Fortpflanzung und entwicklung vonAnemonia sulcata (Anthozoa, Actiniaria) II. Frühentwicklung, Blastula und Gastrula (1985)
    Springer
    Helgoland marine research 39 (1985), S. 341-356 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Early developmental stages of theAnemonia germ are characterized by asynchronously dividing nuclei and an extreme delay of blastomere differentiation. The nuclei migrate to the periphery, whereas nutritive substances remain in the interior. Following this stage, the appearance of cell boundaries results in the formation of the blastoderm and the simultaneous division of the yolk into many fragments. Most of them are exclusively filled with reserve material; only very few contain zooxanthellae or nuclei. On the embryo's surface, conically shaped bundles of long microvilli are obvious. They appear to be less regularly arranged than the spines of oocytes before insemination. Pigment granules that have originated from fusing Golgi vesicles are crowded peripherally in the blastoderm cells. In the nucleoplasm single annulate lamellae that seem to be cut off from the nuclear envelope can frequently be found. There is no further cellular differentiation until gastrulation is completed. Though yolk-containing cellular fragments occupy nearly the whole blastocoel, entoderm formation occurs by invagination. Ultrastructural observations provide evidence of the existence of interstices between entoderm cells that allow all nutritive substances to pass gradually into the gastric cavity. In the region of the blastoporus there are cellular processes enveloping reserve material. Presumably, these observations indicate a so-called “filtration of nutritive yolk” (Korschelt & Heider, 1909) that might represent an additional mode for the transfer of yolk-containing cellular fragments from blastocoel into gastrocoel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01992777
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  • 3
    Electronic Resource
    Electronic Resource
    Synthese und Reaktionen von 2-Amino-1-aryl-5-oxo-Δ2-pyrrolin-3-carbonitrilen (1989)
    Springer
    Monatshefte für Chemie 120 (1989), S. 315-322 
    Details
    ISSN: 1434-4475
    Keywords: 2-Amino-pyrroline-3-carbonitriles ; α-Chloro acetanilides ; 2,3-Dihydropyrrolo[2,3-b]pyridines ; Malononitrile ; Thieno[3,2-c]pyrrolo[1,2-a]pyrimidines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The reaction of malononitrile with α-chloro acetanilides1 in presence of potassium carbonate yields the 1-aryl-5-oxo-Δ2-pyrrolin-3-carbonitriles2, in presence of triethylamine the 4,6-diamino-1-aryl-2-oxo-2,3-dihydropyrrolo[2,3-b]pyridin-5-carbonitriles3 are formed. From 2-chloroacetylamino-benzencarbonitrile and malononitrile the 5-amino-1-oxo-1,2-dihydropyrrolo[1,2-a]chinazolin-3-carbonitrile (4) arise. Analogously from the 2-chloroacetylamino-thiophen-3-carbonitries5 the 7,8-dihydro-thieno[3,2-e]pyrrolo[1,2-a]pyrimidine derivatives6 are obtainable. Hydrolysis of2 a by treatment with hydroxide or acid, respectively, yields the 1,1,2-ethanetricarboxylic acid and derivatives9 a,b. Phenyldiazonium salt reacts with2 to form the triazene 7 only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811744
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  • 4
    Electronic Resource
    Electronic Resource
    Die Polarisation der Ramanstrahlung in Kristallen (1930)
    Springer
    The European physical journal 65 (1930), S. 319-329 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Die Ramanspektra von Kalkspat und Natronsalpeter werden in ihrer Abhängigkeit von der Lage der Kristallachse zur Einstrahlrichtung untersucht, und es wird ihr Polarisationssinn bestimmt. Die Theorie von Leontowitsch wird mit den Resultaten nicht in Übereinstimmung gefunden, doch ist eine Abänderung möglich, die dann mit den Beobachtungen im Einklang ist. Gips wird in entsprechender Weise untersucht, wobei besonders die Wasserbanden ein charakteristisches Verhalten zeigen. Die Polarisation der SO4-Schwingungen läßt sich nicht deuten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01397177
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  • 5
    Electronic Resource
    Electronic Resource
    Orientation of an oxygen-induced non-axially symmetric electric field gradient at Ta in Nb (1986)
    Springer
    The European physical journal 64 (1986), S. 461-467 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The interaction of dilute Hf in Nb with interstitially dissolved oxygen has been investigated via the γ-γ-TDPAC-technique applied to the 482 keV state of181Ta. After melting the parent radioactivity181Hf with Nb the trapping of oxygen at the probe atoms leads to a quadrupole interaction frequency ν Q =268(1) MHz with an asymmetry parameter of η=0.68(1). The temperature dependence of this frequency between 17 K and 293 K was found to be very weak whereas η varies considerably. In a single crystal experiment the orientation of the three principal axes of the electric field gradient tensor leading to ν Q has been determined. TheV zz -axis points into a 〈110〉, theV yy -axis into a 〈100〉 and theV x -axis into a 〈110〉 direction. The results can be explained in the point charge model by assuming that one oxygen atom is trapped on the second nearest neighbour octahedral position next to the substitutional atom and the covalent bonds between the daughter Ta and the oxygen lead to a localization of charge near the probe atom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01312840
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Kristallstruktur der Nitrate (1931)
    Springer
    The European physical journal 68 (1931), S. 766-767 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01391131
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  • 7
    Electronic Resource
    Electronic Resource
    Erwiderung auf eine Bemerkung der Herren A. Lustig und M. Reiss in Wien (1933)
    Springer
    The European physical journal 81 (1933), S. 700-702 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01338887
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  • 8
    Electronic Resource
    Electronic Resource
    Dual characterization of order continuity and some applications (1988)
    Springer
    Archiv der Mathematik 51 (1988), S. 446-450 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01198629
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  • 9
    Electronic Resource
    Electronic Resource
    Influence of medium amino acids on the ouabain sensitive and insensitive86Rb+-fluxes in Hela cells (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 436-437 
    Details
    ISSN: 1420-9071
    Keywords: HeLa cells ; Na+, K+-pump ; Na+, K+, 2Cl−-cotransport ; amino acids ; monensin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Components of the86Rb+-influx in HeLa cells were investigated in Joklik minimal essential medium, or in Earle's balanced salt solution with and without medium amino acids. The presence of amino acids led to the stimulation of the ouabain sensitive86Rb+-uptake and inhibition of the diuretic-sensitive and residual86Rb+-fluxes. These results show that the presence of amino acids is an important regulator of the K+/Rb+-fluxes under normal conditions in growth medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02118646
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  • 10
    Electronic Resource
    Electronic Resource
    Rezensionen (1985)
    Springer
    Journal for general philosophy of science 16 (1985), S. 167-187 
    Details
    ISSN: 1572-8587
    Source: Springer Online Journal Archives 1860-2000
    Topics: Philosophy , Nature of Science, Research, Systems of Higher Education, Museum Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01800840
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