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  • Springer  (91)
  • Springer Nature  (55)
  • Oxford University Press  (21)
  • 1
    Electronic Resource
    Electronic Resource
    Tissue distribution of PCB components in swine and sheep fed three different rations containing Aroclors 1242 and 1254 (1977)
    Springer
    Archives of environmental contamination and toxicology 5 (1977), S. 257-278 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Growing swine and sheep were fed three dietary variations containing 20 ppm of Aroclors 1242 or 1254 for 13 to 15 weeks. Generally, Aroclor 1254 residues were higher; higher 1242 residues in swine blood, spleen, and ovary are attributed to persistent major components of this Aroclor. Some minor differences in total PCB were observed with varying diets, but peak composition did not vary. Some lower chlorinated components maintained higher levels in the blood relative to other components; other components were selectively accumulated in tissues such as fat and muscle. Blood and fat residues in sheep declined during the last weeks of feeding. Microsomal oxidase levels were elevated in response to PCB and diet in both species, but the response was greater in sheep. Sheep liver microsomes were capable of metabolizing pure analogs and components of Aroclor 1242. Major differences in Aroclor profiles can be demonstrated between swine and sheep residues and total residues can be estimated by measuring selected peaks in blood and backfat. The peaks which provide the most reliable estimate of total PCB residue vary with species and Aroclor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220909
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  • 2
    Electronic Resource
    Electronic Resource
    Apparent pharmacokinetics of PCB components in growing pigs and lambs when fed a ration containing aroclor 1254 (1976)
    Springer
    Archives of environmental contamination and toxicology 4 (1976), S. 226-245 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Young growing lambs and pigs were fed a ration containing 200 ppm of Aroclor 1254 for 35 days and then switched to “clean” feed. Blood and fat samples were collected periodically throughout the experiment and analyzed for components of Aroclor 1254 and total PCB. Several components are apparently accumulated and eliminated at different rates within each species, as seen by comparing gas chromatograph tracings, accumulation ratios and apparent rate constants of elimination. Differences in accumulation and elimination of Aroclor components, some of which were apparently caused by differences in growth rates, were also seen between pigs and lambs. Variable growth rates of different species of food producing animals are an important factor to consider when dealing with tissue distribution and residues of polychlorinated biphenyls for determination of carcass disposition, as well as accumulation of toxic concentrations in the animal body.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02221026
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  • 3
    Electronic Resource
    Electronic Resource
    Ancyromonadida: A New Phylogenetic Lineage Among the Protozoa Closely Related to the Common Ancestor of Metazoans, Fungi, and Choanoflagellates (Opisthokonta) (2000)
    Springer
    Journal of molecular evolution 51 (2000), S. 278-285 
    Details
    ISSN: 1432-1432
    Keywords: Key words: Protozoa — Flagellate —Ancyromonas—Apusomonas— Opisthokont — 18S small subunit ribosomal DNA — Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Molecular and morphological evidence points to the ancyromonad Ancyromonas as a plausible candidate for the closest relative to the common ancestor of metazoans, fungi, and choanoflagellates (the Opisthokonta). Using 18S rDNA sequences from most of the major eukaryotic lineages, maximum-likelihood, minimum-evolution, and maximum-parsimony analyses yielded congruent phylogenies supporting this hypothesis. Combined with ultrastructural similarities between Ancyromonas and opisthokonts, the evidence presented here suggests that Ancyromonas may form an independent lineage, the Ancyromonadida Cavalier-Smith 1997, closer in its relationship to the opisthokonts than is its nearest protist relatives, the Apusomonadida. However, the very low bootstrap support for deep nodes and hypothesis testing indicate that the resolving power of 18S rDNA sequences is limited for examining this aspect of eukaryotic phylogeny. Alternate branching positions for the Ancyromonas lineage cannot be robustly rejected, revealing the importance of ultrastructure when examining the origins of multicellularity. The future use of a multigene approach may additionally be needed to resolve this aspect of eukaryotic phylogeny.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002390010089
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  • 4
    Electronic Resource
    Electronic Resource
    Verfahren zur coulometrischen Bestimmung geringer Wasserstoffgehalte in Gasen (1975)
    Springer
    Microchimica acta 63 (1975), S. 653-662 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A description is given of a gas coulometric procedure for the determination of hydrogen in inert gases. Hydrogen is titrated with the aid of oxygen introduced electrochemically into the gas stream. Calcium oxide-stabilized zirconium oxide ceramic serves as electrolyte. The determination of the equivalence-point follows gas potentiometrically, likewise with employment of zirconium oxide ceramic. The procedure was employed for the determination of the permeation of hydrogen through the walls of a nickel membrane in the temperature range of 180–350° C. Additional employment possibilities are pointed out.
    Notes: Zusammenfassung Ein gascoulometrisches Verfahren zur Analyse von Wasserstoff in Inertgasen wurde beschrieben. Wasserstoff wird mit Hilfe elektrochemisch in den Gasstrom dosierten Sauerstoffs titriert. Als Elektrolyt dient calciumoxid-stabilisierte Zirkonoxidkeramik. Die Ermittlung des Äquivalenzpunktes erfolgt gaspotentiometrisch, ebenfalls unter Verwendung von Zirkonoxidkeramik. Das Verfahren wurde zur Bestimmung der Permeation von Wasserstoff durch die Wandung einer Nickelmembran im Temperaturbereich von 180–350° C verwendet. Auf weitere Anwendungsmöglichkeiten wird hingewiesen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01217326
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  • 5
    Electronic Resource
    Electronic Resource
    Soft solar X-rays and solar activity (1971)
    Springer
    Solar physics 17 (1971), S. 76-88 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Soft X-radiation between 8–12 Å was found to be emitted from the Sun at the time of four optically-identified major systems of loop prominences. The peak emission rates and time-integrated X-ray energies are very similar for three of the events while the fourth appeared to emit X-rays only weakly. The data are not consistent with a compression-condensation model for the loops, and support the fast-proton injection model. Proton injection may take place on a long time scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152862
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  • 6
    Electronic Resource
    Electronic Resource
    Power spectra of velocity fluctuations in plages (1974)
    Springer
    Solar physics 39 (1974), S. 79-90 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Spatial power spectral densities of velocities in plages were compared with velocity power spectra of the quiet photosphere. The comparison suggests that photospheric oscillations are not gravity waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154971
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  • 7
    Electronic Resource
    Electronic Resource
    Two-dimensional spatial power spectra of photospheric velocity fluctuations (1974)
    Springer
    Solar physics 39 (1974), S. 363-375 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two-dimensional spatial autocorrelation functions and power spectral density distributions were obtained from high-resolution velocity spectroheliograms. Although the autocorrelation functions indicate the existence of velocity cells of size roughly 2500 to 3500 km, the power spectra fail to reveal them because the cells are not strictly spatially periodic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162429
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  • 8
    Electronic Resource
    Electronic Resource
    A comparison of the temperature and emission measure of X-ray active regions with coronal magnetic fields (1979)
    Springer
    Solar physics 63 (1979), S. 157-164 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The distribution of temperature and of emission measure in X-ray active regions relative to the coronal magnetic fields has been investigated. The position of maximum temperature and the position of maximum emission measure were found to lie along the magnetic neutral line, with the maximum temperature tending to lie above the position of an abrupt change in direction of the neutral line. Several simple structural models of these regions are compared to the emission measure. The total magnetic energy and the total emission measure appear to be related by a power law in the regions studied by us.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00155706
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  • 9
    Electronic Resource
    Electronic Resource
    Solar soft X-rays and solar activity (1969)
    Springer
    Solar physics 8 (1969), S. 348-368 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Soft solar X-rays (8 ⩽ gl ⩽ 12 Å) were observed from OSO-III. An analysis of the X-ray enhancements associated with 165 solar flares revealed that there is a tendency for a weak soft X-ray enhancement to precede the cm-λ burst and Hα flare. The peak soft X-ray flux follows the cm-λ peak by about 4 min, on the average. Additionally, it was found that flare-rich active centers tend to produce flares which are stronger X-ray and cm-λ emitters than are flares which take place in flare-poor active centers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00155382
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  • 10
    Electronic Resource
    Electronic Resource
    Soft solar X-rays and solar activity (1971)
    Springer
    Solar physics 17 (1971), S. 181-193 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Soft X-ray (8–12 Å), optical and radio data are analyzed for times during which flares were inferred to have taken place just behind the Sun's limb (infra-limb flares). The analysis, together with the probable positions of the inferred flares, suggests that the soft X-ray source volume lies below the cm-λ radio source, and that the flare impulse or explosion may in some flares be located at an atmospheric level near 104 km altitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152871
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