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  • Springer  (401)
  • Wiley-Blackwell  (255)
  • 1985-1989  (343)
  • 1975-1979  (268)
  • 1930-1934  (45)
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  • 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
    Potentiometrische Untersuchung der Konformationsumwandlung von Polymethacrylsäure in wäßrigen Harnstoff- und Xyloselösungen (1977)
    Springer
    Colloid & polymer science 255 (1977), S. 550-555 
    Details
    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
    Description / Table of Contents: Summary The potentiometric behaviour of poly(methacrylic acid) was investigated in the presence of the structure breaker urea and the structure maker xylose. For purposes of comparison measurements on poly(acrylic acid) and acetic acid were carried out. Thereby the conception that the presence of urea reduces the abnormal behaviour of hydrophobic polyacids is confirmed. Instead of the expected increase in cooperativity in the case of a xylose content only an insignificant decrease is observed. This finding is discussed with regard to the causes of the stabilization of the coil and the character of the abnormal change of conformation. The titration curves obtained in the presence of urea are evaluated considering the fact that urea is able to bind H+ ions.
    Notes: Zusammenfassung Das potentiometrische Verhalten der Polymethacrylsäure wurde in Gegenwart des Strukturbrechers Harnstoff und des Strukturbildners Xylose untersucht. Zu Vergleichszwecken wurden außerdem Messungen an Polyacrylsäure und Essigsäure durch geführt. Dabei wird die Vorstellung bestätigt, daß die Anwesenheit von Harnstoff das anomale Verhalten hydrophober Polysäuren unterdrückt. Anstelle der erwarteten Zunahme der Kooperativität bei Xylosezusatz wird eine geringfügige Abnahme registriert. Dieser Befund wird im Hinblick auf die Ursachen der Knäuelstabilisierung und auf das Wesen der anomalen Konformationsumwandlung diskutiert. Die in Gegenwart von Harnstoff erhaltenen Titrationskurven werden quantitativ in Anbetracht der Tatsache ausgewertet, daß Harnstoff H+-Ionen zu binden vermag.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01549741
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  • 4
    Electronic Resource
    Electronic Resource
    Bestimmung zwischenmolekularer Kräfte aus in einem Trennrorh ermittelten Thermodiffusionsfaktoren (1977)
    Springer
    Colloid & polymer science 255 (1977), S. 927-927 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01617119
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  • 5
    Electronic Resource
    Electronic Resource
    Book reviews (1979)
    Springer
    Computers and the humanities 13 (1979), S. 131-149 
    Details
    ISSN: 1572-8412
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Media Resources and Communication Sciences, Journalism
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02404510
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  • 6
    Electronic Resource
    Electronic Resource
    Galactic mass determinations from incomplete rotation curves (1976)
    Springer
    Astrophysics and space science 41 (1976), S. 3-14 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Given an incomplete rotation curve of a spiral galaxy, various assumptions about the Galaxy beyond the last observed point are made: (A) the force falls off as 1/r 2, (B) the mass density is zero, and (C) the mass density falls off as 1/r 3. The msss distributions obtained from each of these assumptions are all well behaved, and it is impossible to choose the correct curve from considerations of the resulting mass distributions alone. The correct mass distribution in the disk system of a galaxy cannot be deduced from an incomplete rotation curve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00684568
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  • 7
    Electronic Resource
    Electronic Resource
    E2 transition probabilities in77Br (1979)
    Springer
    The European physical journal 293 (1979), S. 85-90 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 77Br has been investigated by the reaction64Ni(16O,p2nγ) at 60 MeV. The following mean lives (in parentheses) have been determined by the recoil distance Doppler shift method (energies in keV): 161.9 (718±50 ps), 575.2 (14.2±2.1 ps), 639.0 (14.1±0.8 ps), 782.0 (4.3±0.9 ps), 790.1 (6.2±0.8 ps), 1,273.2 (4.0±1.0 ps), 1,303.0 (4.0±1 ps), 1,480.8 (0.6 ±0.2 ps). The resultingB(E2) values are compared with rotor plus particle calculations. Nuclear reaction64Ni(16O,p2nγ)E 0=60 MeV; measuredE γ, recoil distance Doppler shift; deducedT 1/2. Enriched target, Ge(Li).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414787
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  • 8
    Electronic Resource
    Electronic Resource
    A study of the influence of shell effects in nuclear level densities on the decay of the compound nucleus58Ni (1979)
    Springer
    The European physical journal 290 (1979), S. 167-172 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mass andZ-distributions of fusion products from the reaction 5.8 MeV/u46Ti+12C were measured in the angular range betweenθ lab=1.5° and 8° using a time-of-flightΔE−E telescope. The results are compared with an earlier measurement of the reaction32 S+26Mg, in which the same compound nucleus was produced at higher excitation energy. The residual nuclide distributions are interpreted with the aid of evaporation calculations and the influence of shell effects in the level densities is discussed. The data are consistent with the assumption that the shell effects vanish above 15 to 20 MeV excitation energy, that is, that they are essentially only important for the last evaporation step.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408111
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Synthesen von 4-Amino-thieno[2,3—b]pyridinen (1979)
    Springer
    Monatshefte für Chemie 110 (1979), S. 1189-1196 
    Details
    ISSN: 1434-4475
    Keywords: 2-Aminothiophenes ; 2-Aminothiophene-3-carbonitriles ; 4-Amino-thieno[2,3-b]pyridines ; 4-Amino-thieno[2,3-b]pyridones-(6) ; β-[Thienyl-(2)-amino-acrylonitriles]
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The Cyclization of 2-(1,1-dicyanovinylamino)-thiophenes2 by treatment with AlCl3 yield 4-amino-5-cyano-thieno[2,3-b]pyridines3. 2-(1-acylvinyl-amino)-3-cyano-thiophenes7, obtainable from 2-amino-3-cyano-thiophenes and β-diketones, react in the presence of AlCl3 to form 4-acylamino-thieno[2,3-b] pyridines8. This reaction is connected with the transfer of the acyl group from C- to the N-atom. 4-Amino-5-cyano-thieno[2,3-b]pyridones-(6)11 are synthesized from 2-amino-3-cyano-thiophenes and ethyl cyano acetate in the presence of sodium ethoxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00910965
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