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  • Elsevier  (18)
  • Springer  (17)
  • American Association for the Advancement of Science (AAAS)
  • International Union of Crystallography (IUCr)
  • 1995-1999  (31)
  • 1965-1969  (5)
  • 1955-1959
  • 1998  (31)
  • 1968  (5)
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Keywords
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  • 1995-1999  (31)
  • 1965-1969  (5)
  • 1955-1959
Year
  • 1
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 171-174 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 212 (1968), S. 83-103 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Within the framework of the hydrodynamic model the exact coupling constants of the coupling of the giant multipole resonances to the surface quadrupole oscillations of nuclei are derived. The differences to former variational calculations are discussed. It is found that the coupling constants for the terms linear in the surface variables are almost the same whereas the coupling constants for the quadratic terms differ appreciably. The influence on the photon absorption and scattering cross sections of spherical nuclei is discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 645-646 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A cold working steel was coated both with high temperature CVD (TiN) and moderate temperature CVD (Ti[C,N]). AES depth profiles show a significant difference at the interface, where a thin oxide layer remains detectable at deposition temperatures of 750 °C. It could be shown that an impedance signal at a frequency of 13 MHz is well suited to detect the early stages of the growth of a CVD coating.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Telomere length, measured by terminal restriction fragments, was examined in tissues from human fetuses of gestational ages estimated as 15–19 weeks. The length of telomeres was similar in most fetal tissues. However, there were significant variations in telomere length among fetuses, with no apparent relationship between gestational age and telomere length. We conclude that synchrony in telomere length exists among tissues of the human fetus. This synchrony is apparently lost during extrauterine life.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Five microhabitat types with varying degrees of bird influence were examined. Soils were collected from open polygons, under mosses and bird nests on a nunatak with breeding snow petrels (Pagodroma nivea) and from open polygons and under mosses on a non-bird nunatak. Nutrient levels (total N and P, nitrate, nitrite and ammonia), moisture levels and δ 15N values were determined and the organic processes of nitrogen fixation (acetylene reduction) and soil respiration (CO2 flux) were examined. Nests represented the most favourable microhabitat type for soil respiration having the highest nutrient levels and most favourable temperature and moisture regimes. The soils under mosses were also favourable and appear to act as a nutrient sink for nutrients originating from the nests. The open polygons were the least favourable for biological activity. There was little nitrogen fixation in any of the soils except for the soils under mosses from the non-bird nunatak. Fixation is possibly limited in favourable microhabitat types on the bird nunatak by high nitrogen levels. These results were confirmed by the δ 15N results, which had high values typical of a seabird signal in the soils from the bird nunatak and values near zero, typical of soils containing fixed nitrogen, on the non-bird nunatak.
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  • 6
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Breeding snow petrels (Pagodroma nivea) may be a major source of nutrients for the ecosystems on the inland nunataks (mountain outcrops) of continental Antarctica. To test this theory, the δ15N and δ13C values of soil and plants (moss, lichen and algae) from 11 nunataks with and without breeding snow petrels in northwestern Dronning Maud Land were compared. High δ15N values in all samples from nunataks with breeding birds provide a strong indication of the presence of breeding birds, as well as the use of bird-derived nitrogen by the plants of these ecosystems. The δ13C values showed little difference between the nunataks and are not a useful indicator of bird effects on ecosystem development.
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  • 7
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Electric membrane properties and motor behaviour of two Antarctic and two middle-latitude species of Euplotes were compared. Membrane potential fluctuations and whole-cell currents were measured using the whole cell clamp. The electrical properties of both of the Antarctic species between themselves and of both of the middle-latitude species are nearly identical. Furthermore, after warming up to 22°C, the Antarctic species grown at 4°C show the same pattern of spontaneous potential fluctuations, induced potential oscillations and membrane currents as the middle-latitude species grown and measured at 22°C. After cooling down to 4°C, the middle-latitude species grown at 22°C show the same electrical properties as the Antarctic species grown and measured at 4°C. The congruence of the temperature-dependent electrical properties in Euplotes species from completely different habitats is presumably based on a universal mechanism of temperature dependence of ionic conductances, indicating the close physiological relationship among the species.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Review of quantitative finance and accounting 11 (1998), S. 5-22 
    ISSN: 1573-7179
    Keywords: Corporate debt ; bonds ; risk premia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract A growing number of papers have applied option pricing techniques to the valuation of risky debt. This paper deals directly with how a firm's relationship to interest rates affects its debt. A sequential binomial model is used to price the zero-coupon bonds of a firm whose value is related to interest rate changes. The results show that the strength of the relationship between firm value and interest rates (interest-rate risk) can have a significant impact on the value of a firm's debt. The model produces its most powerful results when the volatility of firm value is high and the term structure has a steep (negative or positive) slope; there is no impact when the term structure is flat. Our results indicate that empirical studies of yield spreads may have severe shortcomings if the relationship of firm value to interest rate changes is ignored.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Systematic parasitology 41 (1998), S. 105-113 
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Steinernema siamkayai n. sp. (Rhabditida: Steinernematidae) is a new entomopathogenic nematode isolated in Lohmsak, Thailand. Morphology, hybridisation and molecular studies indicated the distinctness of S. siamkayai n. sp. from other Steinernema spp. Diagnostic characters include: the total body length (398–495 μm) and tail length (31-41μm) of the third-stage infective juvenile and lateral field pattern with 6-8 longitudinal ridges; the presence of a tail mucro in both first and second generation females and males; the size and shape of the spicules and gubernaculum, and the arrangement of the genital papillae of the first and second generation males; and the shape of the vulva and tail of the first generation female and second generation female
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 239 (1968), S. 225-233 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Radioaktives Sulfit wurde Ratten durch die Schlundsonde verabreicht, und der Weg des Sulfits im Organismus der Ratte untersucht. Die nahezu vollständige Ausscheidung des Schwefels als Sulfat im Urin beweist, daß Sulfit resorbiert wird, den Blutkreislauf durchläuft und über die Nieren ausgeschieden wird. Es wurden Versuche unternommen, den Oxydationsort im Ratten-organismus zu ermitteln. Durch Bestimmung der Gesamtradioaktivität und des Anteils an 35SO3 2− in den Organen, im Blut, im Magen sowie in den einzelnen Darmabschnitten konnte gezeigt werden, daß Sulfit schon beim Übergang vom Magen in den Darm zum Teil oxydiert wird. Im leeren Darmtrakt wird etwa die Hälfte oxydiert, bei gefülltem ein noch größerer Anteil; jedenfalls gelangt Sulfit immer in die Blutbahn. Es zeigte sich, daß bei mit Futterresten gefülltem Magen und Darm durch die geringere Resorption die Sulfitwerte im Blut und in den Organen abfielen. In der Leber konnte Sulfit nur in Spuren nachgewiesen werden, wonach auf eine Sulfitoxidaseaktivität in diesen Organen geschlossen werden kann. Durch die verstärkte Resorption im leeren Magen und Darm konnte einer Erhöhung des Sulfitgehaltes in diesen Organen beobachtet werden, und damit auch das Auftreten von Sulfit in der Leber. In der Leber ist aber für die Gesamtradioaktivität nur das Sulfat verantwortlich. Einen Einbau von 35S in körpereigene Substanzen konnte nicht nachgewiesen werden. Eine empfindliche Methode zur Bestimmung von Sulfit mit 2,6-Dichlorphenolindophenol wurde entwickelt.
    Notes: Abstract Radioactive sulphite was dispensed to rats by means of a stomach tube and the passage through the organism was followed. Almost complete excretion of sulphur as sulphate in the urine shows that sulphite is resorbed, follows the circulation of the blood and is excreted by the kidney. Experiments were made in order to find out the place of sulphite oxidation in the body of the rat. By estimation of the total radioactivity and the amount of 35SO3 2− in the different organs, blood, stomach and intestines it was shown that sulphite is already oxidized partly when passing from the stomach to the intestines. The empty intestines oxidize about one half, when filled an even greater amount is oxidized. Experiments showed that intestines filled with remains of food cause the sulphite values of blood and organs to decrease because of little resorption. In the liver only traces of sulphite could be detected. This may count for a sulphite oxidase activity in this organ. After increased resorption by the empty stomach and intestines an increase of the sulphite content of these organs was observed and thus the appearance of sulphite in the liver. In the liver, however, only sulphate is responsible for the total radioactivity. A sensitive method for the determination of sulphite by means of 2,6-dichlorophenolindophenol was developed.
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