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  • Springer  (82)
  • American Meteorological Society (AMS)
  • 2005-2009  (35)
  • 1975-1979  (33)
  • 1935-1939  (14)
  • 1
    Electronic Resource
    Electronic Resource
    Untersuchung der Iouenassoziation im System Natriummetavanadat-Natriumchlorid-Wasser mit der Ultrazentrifuge (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 161-166 
    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 system Na4(VO3)4-NaCl-H20 is taken as an example for ultracentrifugal measurements at sedimentation equilibrium to determine the molar mass and the valency of a polymer electrolyte in a ternary system when interactions exist between the polymer and the supporting electrolyte. The experimental apparent molar mass is obtained by extrapolation to zero value of concentration of both the polymeric and supporting electrolyte. It is possible to correlate the quantity (alnyPX z /amBX)mPXz at the point m PX z = 0 mole kg-1 with the apparent valency zapp of the polymeric anion.z app is related to the stoichiometric valency by the equationz app = z =a.Z. Thus the dissociation constant can be calculated for complete dissociation of the polymer electrolyte. The dependence of zapp and (aln y PX z /a m BX ) m PX z = 0 on concentration of the supporting electrolyte called for in the correlation is verified experimentally.
    Notes: Zusammenfassung Am Beispiel des Systems Na4(VO3)4-NaCl-H2O wird untersucht, in welcher Weise Ultrazentrifugenmessungen im Sedimentationsgleichgewicht durchgeführt werden müssen, um die molare Masse und die Ladungszahl von Polymerelektrolyten in ternären Systemen unter der Bedingung von nicht vernachlässigbaren Wechselwirkungen zwischen Polymerund Fremdelektrolyt zu bestimmen. Es erweist sich, daß die experimentellen scheinbaren molaren Massen nicht nur auf die Polymerkonzentration Null extrapoliert werden müssen, sondern auch auf die Fremdelektrolytkonzentration Null. Es gelingt, die Ableitung (alnyPXz/amBx)mPXz an der StellemPXz = 0 mol kg-1 mit einer scheinbaren mittleren Ladungszahlz app des Polymeranions zu korrelieren. Zwischen dieser und der stöchiometrischen Ladungszahlz des Polymeranions besteht die Beziehungz app = Z =az, so daß die Dissoziationskonstante des Polymerelektrolyten für die summarische Dissoziation berechnet werden kann. Die aus dieser Korrelation folgenden Abhängigkeiten der scheinbaren mittleren Ladungszahlen und der Ableitung (alnypx z /amBX)Mpx z = 0 von der Konzentration des Fremdelektrolyten werden experimentell bestätigt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01679174
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  • 2
    Electronic Resource
    Electronic Resource
    A combination of sister chromatid differential staining and giemsa banding (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 916-918 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary We report a procedure for combining sister chromatid differential staining and G banding in the same metaphase plate. Mammalian cells in culture are grown in medium containing 5-bromodeoxyuridine for two cell cycles, and conventional air-dried preparations are made. The slides are treated with a trypsin or a urea solution the same way as for regular G banding. This method is simple and fast and provides additional information for cytogeneticists.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358850
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of vinblastine on pancreatic enzymes secretion induced by cyclic nucleotide derivatives (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 1066-1068 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Vinblastine did not affect the basal secretion of enzymes from the rat pancreas, but it potentiates the secretory response to dibutyryl cyclic AMP. This potentiation is confirmed by the observation of numerous pictures of exocytosis at the apical part of the acinar cell. Dibutyryl cyclic GMP by itself, or associated with vinblastine, failed to modify the spontaneous release of enzymes or the secretion induced by dibutyryl cyclic AMP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01945973
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  • 4
    Electronic Resource
    Electronic Resource
    Chromosome banding pattern conservatism in birds and nonhomology of chromosome banding patterns between birds, turtles, snakes and amphibians (1975)
    Springer
    Chromosoma 50 (1975), S. 69-77 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The G-banded karyotypes of 4 species of birds representing the orders Galliformes, Columbiformes and Musophagiformes were compared. Banding pattern homology between orders was limited to 5 major chromosome arms and the Z chromosome. Even in these major chromosome arms pericentric and paracentric inversions produced alteration of the banding pattern sequences. Addition of constitutive heterochromatin was responsible for changes in banding pattern in the Z chromosome. The chromosome banding patterns of an emydid turtle, Terrepene Carolina, 5 species of boid snakes of the genera Liasis, Acrantophis, and Sanzinia and the African clawed-frog, Xenopus muelleri, were also compared to the bird chromosome banding patterns. No homology was observed between any of these major groups: bird, snake, turtle, amphibian. However, intergrouphomology was apparent. — The data obtained do not support reports of broad interordinal direct homology of the macrochromosomes of birds and refutes the idea of a primitive bird karyotype with 3 pairs of “A group” chromosomes and 3 pairs of “B group” chromosomes. — The major mechanisms responsible for chromosome evolution in birds appear to be centric and tandem fusions, paracentric and pericentric inversions, and addition or deletion of heterochromatin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00284963
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  • 5
    Electronic Resource
    Electronic Resource
    Die Wirkung von Quecksilberdampf auf die oberen Luftwege (1935)
    Springer
    Naturwissenschaften 23 (1935), S. 453-456 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01493223
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  • 6
    Electronic Resource
    Electronic Resource
    Fünfundzwanzig Jahre Borchemie-Forschung (1937)
    Springer
    Naturwissenschaften 25 (1937), S. 417-420 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01492209
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  • 7
    Electronic Resource
    Electronic Resource
    Trace-Aktivitätskoeffizienten und Ionenassoziation von Natriummetawolframat im System Natriummetawolframat-Natriumperchlorat-Wasser (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 363-368 
    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 An ultracentrifugal study of the sedimentation equilibrium of the system Na2[H2W12O40]-NaClO4-H2O at 25 °C is presented. The dependency of the apparent charge of the sodium metatungstate on NaClO4-molality is investigated. From these data the dissociation constant for the dissociation of the sodium metatungstate in the presence of NaClO4 according to the equation Na[H2W12O40] ⇌ 6Na+ + [H2W12O40]6− is calculated toK=0.08 mol6·kg−6. The cross differential quotient $$\left( {\frac{{\partial \ln \gamma _{PXz} }}{{\partial m_{BX} }}} \right)_{m_{PXz} = 0} $$ (γ PXz is the trace activity coefficient of the sodium metatungstate) shows a behavior in its dependence on NaClO4-molality which to our knowledge has not yet been reported by other authors.
    Notes: Zusammenfassung In der vorliegenden Arbeit wird das Sedimentations-gleichgewicht des Systems Na6[H2W12O40]-NaClO4-H2O bei 25 °C untersucht. Die scheinbare Ladungszahl des Natriummetawolframats wird als Funktion der NaClO4-MolalitätmNaClO4 ermittelt. Aus dieser Abhängigkeit kann für die summarische Dissoziation des Natriummetawolframats Na2[H2W12O4o] ⇌ 6Na+ + [H2W12O40]6− die DissoziationskonstanteK in Gegenwart von NaClO4 als Fremdelektrolyt zuK=0,08 mol6·kg−6 bestimmt werden. Der Kreuzdifferentialquotient $$\left( {\frac{{\partial \ln \gamma _{PXz} }}{{\partial m_{BX} }}} \right)_{m_{PXz} = 0} $$ (γ PXz , ist der Trace-Aktivitätskoeffizient des Natriummetawolframats) wird ebenfalls als Funktion der NaClO4-Molalität ermittelt. Die Konzentrationsabhängigkeit des Trace-Aktivitätskoeffizienten zeigt einen Verlauf, wie er unseres Wissens nach noch nicht von anderen Autoren beobachtet wurde.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01544330
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  • 8
    Electronic Resource
    Electronic Resource
    Bestimmung der molaren Masse und der Ladungszahl von Polymerelektrolyten mit der Ultrazentrifuge (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 37-43 
    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 sedimentation equilibria of the systems sodium metatungstate-sodium chloride-water and sodium metatungstate-sodium perchlorate-water are investiated. In both systems the apparent molecular mass Mapp of sodium metatungstate (PX z) is measured in dependence on partial density ϱ 0 PX z before centrifugation. By linear extrapolation of the function Mapp = Mapp (ϱ 0 PX z the limiting value (Mapp)o for ϱ 0 PX z = 0 is obtained. The variation with sodium chloride and sodium perchlorate molality of the quantity (ϱlnγ PX z ϱm BX )mPXz is calculated from (Mapp)o data. The determination of the molecular mass and the algebraic valency of a polymeric ion by means of the (Mapp)o values calculated by Lamm-Williams equation is discussed. In order to obtain these two quantities at least two series of experiments are required, each of which using a different supporting electrolyte. External measurements are not necessary. In this way reliable values for the molecular mass as well as for the stoichiometric valency are obtained.
    Notes: Zusammenfassung In der vorliegenden Arbeit wird das Sedimentationsgleichgewicht der Systeme Na6[H2W12O40]—NaCI—H2O und Na6[H2W12O40]—NaClO4— H2O untersucht. Die scheinbare molare Masse Mapp des Natriummetawolframats wird in beiden Systemen als Funktion der Natriummetawolfrarnat-Anfangspartialdichte ϱ 0 PX z gemessen. Durch lineare Extrapolation der Funktion Mapp = Mapp (PP,, ) auf die Polymerelektrolyt-Anfangspartialdichte Null können die Grenzwerte der scheinbaren molaren Masse (Mapp)o ermittelt werden. Aus den (Mapp)o-Werten wird die Abhängigkeit der Größe (ϱlnγ PXz /ϱm BX ) mPXz von der NaCI- bzw. NaClO4-Molalität berechnet. Die Bestimmung der molaren Masse und der (stöchiometrischen) Ladungszahl eines Polymerelektrolyten aus den experimentell ermittelten (Mapp)o-Werten unter Anwendung der Lamm-Williams-Gleichung wird diskutiert. Zur Ermittlung der beiden Größen müssen mehrere Versuchsreihen mit zwei verschiedenen Fremdelektrolyten durchgeführt werden. Externe Messungen sind nicht erforderlich. Man erhält auf diese Weise verläßliche Werte so-wohl der molaren Masse als auch der (stächiometrischen) Ladungszahl.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01746689
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  • 9
    Electronic Resource
    Electronic Resource
    Chromosome banding patterns and the nucleolar organizer region of the eastern mole (Scalopus aquaticus) (1976)
    Springer
    Cellular and molecular life sciences 32 (1976), S. 1276-1277 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The C and G chromosome banding patterns and the AgAS positive sites (NOR regions) of cultured lung cells of the Eastern mole (Scalopus aquaticus) are presented. A distinctive secondary constriction is found on a pair of autosomes instead of on the X-chromosome as previously believed. The presence of a heterochromatic heteromorphism is noted and a large amount of constitutive heterochromatin is present in the karyotype.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01953090
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  • 10
    Electronic Resource
    Electronic Resource
    The photodisintegration of6Li and7Li (1979)
    Springer
    The European physical journal 291 (1979), S. 353-365 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The photodisintegration of the stable Lithium isotopes has been investigated by spectroscopy of the emitted charged particles using the Giessen bremsstrahlung facility. Protons, deuterons, tritons,3He and alpha particles were detected and identified up to 20MeV particle energy. Angular distributions were measured using γ-ray energies up toE γ =50 MeV. They are compared with theoretical predictions and with other experiments. A remarkable low (γ, t)-cross section was found for both isotopes in disagreement to previous measurements using virtual photons. Coincidence measurements between the emitted particles were performed in order to study the manybody-breakups of7Li.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408386
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