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  • Springer  (70)
  • Ovid Technologies
  • 2000-2004  (47)
  • 1955-1959  (23)
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  • 1
    Electronic Resource
    Electronic Resource
    Food uptake and fine structure of Cryothecomonas longipes sp. nov., a marine nanoflagellate incertae sedis feeding phagotrophically on large diatoms (2000)
    Springer
    Helgoland marine research 54 (2000), S. 18-32 
    Details
    ISSN: 1438-3888
    Keywords: Key words Cryothecomonas longipes ; Marine diatoms ; Nanoflagellate ; Parasitoid ; Phagocytosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Cryothecomonas longipes Schnepf and Kühn sp. nov. is a colourless biflagellate organism, 9–14 µm long and 7–9 µm wide when not filled with food vacuoles. It was detected in the North Sea, feeding with pseudopodia on diatoms. It penetrates the host shell, while the main body of the flagellate remains outside the frustule. Cells are covered with a multilayered theca. The pseudopodium protrudes through a preformed slit in the theca. Each flagellum also emerges through a pit in which the theca forms a funnel of complex structure that girdles each flagellum. The anterior flagellum is 9–15 µm long and oriented forward; the ventral flagellum, posteriorly directed, is 20–24 µm long and bears fine hairs. The flagellar roots consist of microtubules that emerge at satellites around the basal bodies and run along the flagellar pits. In addition, the ventral flagellum is accompanied by a band of six microtubules. It is proximally attached to a small fibrillar band, which interconnects the basal bodies. Cryothecomonas longipes has two or three types of extrusomes which pierce the theca when discharged. Their mode of discharge is discussed. Microbody-like vesicles containing small tubules are closely associated with older digestion vacuoles. Cryothecomonas longipes is compared with other species of the genus and a diagnosis is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s101520050032
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  • 2
    Electronic Resource
    Electronic Resource
    Untersuchungen über das Auftreten von hochfrequenten Schwingungen an einer Ionenquelle mit magnetischem Führungsfeld (1957)
    Springer
    The European physical journal 149 (1957), S. 267-275 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Bei der Untersuchung einer Ionenquelle wurden hochfrequente Schwingungen um 1 MHz festgestellt. Die Frequenzabhängigkeit von der Anodenspannung ergab, daß die Schwingungen nur mit ganz bestimmten Frequenzen auftraten. Die Schwingungen werden als plasmaakustische Schwingungen gedeutet. Amplitudenmessungen dieser Schwingungen als Funktion der Anodenspannung und des Magnetfeldes werden mitgeteilt. Der Modulationsgrad des Ionenstromes ergab sich in H2 zu 0,06% und in A zu 0,2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01333143
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  • 3
    Electronic Resource
    Electronic Resource
    Non-equilibrium dynamics of simple spherical spin models (2000)
    Springer
    The European physical journal 13 (2000), S. 531-537 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 05.20.-y Classical statistical mechanics - 75.10.Nr Spin-glass and other random models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We investigate the non-equilibrium dynamics of spherical spin models with two-spin interactions. For the exactly solvable models of the d-dimensional spherical ferromagnet and the spherical Sherrington-Kirkpatrick (SK) model the asymptotic dynamics has for large times and large waiting times the same formal structure. In the limit of large waiting times we find in both models an intermediate time scale, scaling as a power of the waiting time with an exponent smaller than one, and thus separating the time-translation-invariant short-time dynamics from the aging regime. It is this time scale on which the fluctuation-dissipation theorem is violated. Aging in these models is similar to that observed in spin glasses at the level of correlation functions, but different at the level of response functions, and thus different at the level of experimentally accessible quantities like thermoremanent magnetization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050065
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  • 4
    Electronic Resource
    Electronic Resource
    Einjährige Feldstärkemessungen im UKW-Rundfunkband in Kolberg bei Berlin (1957)
    Springer
    Pure and applied geophysics 38 (1957), S. 157-168 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Summary The results of field-strength-measurements over some propagation paths in the frequency range from 88–100 Mc are presented. On the average the lowest field-strength could be observed in June and December. There was found a correlation between the temperature gradient at inversions and the field-strength when using the average values of field-strenght and the single values. The correlation coefficient between the field-strength and the temperature gradient at the inversions is a function of the length of the propagation path. In the same way the amplitude of the daily variation of field-strength depends on the length of the propagation path; the values being a maximum at a distance of 200 to 300 km. With a coefficient of 0.49 there was found a good correlation between the field-strength and the air pressure variation at ground level. As there also exists a correlation between the field-strength and the temperature variations in the lower part of the troposphere a better correlation coefficient of 0.58 was found when comparing the field-strength with the air pressure variation and the variation of the temperature at the 700 mb-level. There are given some diagrams of the field-strengt dependent upon the available air mass, the height of the 700 mb-level a.o. Some diagrams present the field-strength variation with varying temperature gradient on inversions. As to the field-strength variation with distance there was found a curve which for more than 300 Km is somewhat below this curve that was measured by the Meteorological Observatory Kühlungsborn. The curve showed somewhat higher values compared with one curve which wac published in a document of the USA presented at the CCIR Assembly in Warsaw in 1956.
    Notes: Zusammenfassung Es wird über einjährige UKW-Ausbreitungsmessungen auf festen Meßstrecken im UKW-Rundfunkband berichtet. Im jährlichen Verlauf der Empfangsfeldstärken konnten im Mittel in den Monaten Juni und Dezember die niedrigsten Feldstärken festgestellt werden. Es zeigte sich ein Zusammenhang zwischen den Temperatursprüngen an Inversionen und den Feldstärken sowohl bei den Monatsmitteln als auch bei den Einzelwerten. Bei der Untersuchung des Korrelationskoeffizienten zwischen den Temperatursprüngen an Inversionen und den Feldstärken ließ sich eine Entfernungsabhängigkeit nachweisen. Auch die Amplitude des Tagesganges und die Schwankungen der Tagesmittelwerte zeigen eine eindeutige Entfernungsabhängigkeit mit Höchstwerten in 200 bis 300 km Entfernung. Mit einem Korrelationskoeffizienten von 0.49 wurde ein guter Zusammenhang zwischen den Feldstärken und dem Bodenluftdruck ermittelt. Da sich außerdem eine Abhängigkeit der Feldstärken von den Temperaturschwankungen der unteren Troposphärenschichten gezeigt hatte, wurde unter Heranziehung des Luftdruckverlaufes und der Temperaturänderungen der 700 mb-Fläche eine Erhöhung des Korrelationskoeffizienten bei Verwendung von Tageswerten auf 0.58 festgestellt. Neben der Abhängigkeit der Feldstärken von der jeweils herrschenden Luftmasse, von der Höhe der 700 mb-Fläche u.a. wurden die Feldstärkeerhöhungen bei Vergrößerung des vertikalen Temperatursprunges an Inversionen untersucht und in Diagrammen mitgeteilt. Die Feldstärkeabhängigkeit mit der Entfernung ergab eine Kurve, die für Entfernungen über 300 km etwas unterhalb der vom Meteorologischen Observatorium Kühlungsborn mitgeteilten Kurve lag und außerdem etwas höhere Werte zeigt als die auf der CCIR-Konferenz in Warschau 1956 neuen mitgeteilten amerikanischen Feldstärkekurven.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01996987
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  • 5
    Electronic Resource
    Electronic Resource
    Hermann Weber † (1957)
    Springer
    Naturwissenschaften 44 (1957), S. 25-26 
    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/BF01146087
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  • 6
    Electronic Resource
    Electronic Resource
    Karl Henke † (1957)
    Springer
    Naturwissenschaften 44 (1957), S. 25-25 
    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/BF01146086
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  • 7
    Electronic Resource
    Electronic Resource
    Über die Bindung der Phosphorwolframsäure im Kollagen (1957)
    Springer
    Naturwissenschaften 44 (1957), S. 538-539 
    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/BF00631418
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  • 8
    Electronic Resource
    Electronic Resource
    Besprechungen (1957)
    Springer
    Naturwissenschaften 44 (1957), S. 547-549 
    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/BF00631434
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  • 9
    Electronic Resource
    Electronic Resource
    A theory of the adaptive growth of biological materials (2000)
    Springer
    Archive of applied mechanics 70 (2000), S. 183-192 
    Details
    ISSN: 1432-0681
    Keywords: Key words Mixture theory ; adaptive growth ; tree ; bone remodeling ; biomechanics ; stimulus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary In this paper, a new theory of the adaptive growth of biological materials is presented. The theory is derived from the basic laws of continuum mechanics. The material is described as a classical mixture of solid material and fluid. It will be shown that several well-known models of the adaptive growth are embedded in this more general theory. In addition, it is clarified on which material assumptions these models are based. Finally, a solution procedure for the new theory is developed, and several examples are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004199900056
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  • 10
    Electronic Resource
    Electronic Resource
    Subaquatische Rutschungen im höheren Oberdevon des Sauerlandes (1955)
    Springer
    International journal of earth sciences 44 (1955), S. 3-25 
    Details
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Zusammenfassung Fältelungen in oberdevonischen Sandsteinen des Sauerlandes wurden als subaquatische Rutschungen gedeutet. Aus der messend ermittelten Gleitrichtung ließ sich das ehemalige Gefälle bestimmen. Es zeigt uns, daß die variszischen Falten schon im Oberdevon embryonal angelegt waren.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01802902
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