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  • Springer  (32)
  • American Institute of Physics (AIP)  (1)
  • Blackwell Publishing Ltd  (1)
  • 1985-1989  (17)
  • 1980-1984  (10)
  • 1955-1959  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    High intrinsic coercivities in iron-rare earth-carbon-boron alloys through the carbide or boro-carbide Fe14R2X (X=BxC1−x) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3574-3576 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the phase Fe14R2X, where R is a lanthanide and X is either boron or carbon, or a mixture of the two, the extent of stability of the carbides and their miscibility with the borides is traced for the lighter rare-earth metals. Like the borides, the carbides are magnetically hard, but unlike them, they do not normally crystallize from the melt, and this property is exploited to produce intrinsic coercivities above 12 kOe in cast materials without the added special processing step of sintering or melt spinning. The high coercivity is related to a cellular microstructure of Fe14R2X in which the cell size is approximately 1 μm. The cell structure, which originates in a peritectoidlike transformation from primary Fe17R2, is quite stable and does not change during prolonged annealing. The coercivity is sensitive to variations in composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338705
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  • 2
    Electronic Resource
    Electronic Resource
    Ecological genetics of Rhizobium meliloti: Diversity and competitive dominance (1987)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 40 (1987), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Symbiotic effectiveness (nitrogen-fixation ability) is not a measure of inter-strain competitiveness, and Rhizobium strains used as inocula frequently compete poorly with indigenous rhizobia for nodulation of the host legume. Competition between rhizobia delimits the use of Rhizobium inoculum in agriculture. We therefore chose to investigate aspects of the gene pool represented by an indigenous population of R. meliloti selected for maximum diversity, particularly for evidence of competitive dominance. This unadapted population was very heterogeneous in terms of plasmid content, somatic antigens and intrinsic antibiotic resistance (IAR). Little tendency towards competitive dominance (measured in terms of nodule occupancy) was observed. Classical methods (serotype, IAR) of characterising strains did not correlate to define dominance of a strain or a group of strains. The data are consistent with a continuum of symbiotically proficient strains under conditions of maximum diversity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1987.tb02033.x
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis of GA20 glucosyl derivatives and the biological activity of some gibberellin conjugates (1984)
    Springer
    Journal of plant growth regulation 3 (1984), S. 207-215 
    Details
    ISSN: 1435-8107
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract GA20-13-0-glucoside (7a) and GA20 glucosyl ester (6a), potential endogenous conjugates in maize, were synthesized chemically. The biological activities of these compounds and of nine more GA glucosyl derivatives were determined using theZea mays dwarf- 5 seedling andOryza sativa cv. “Tan-ginbozu” assays. The relative bioactivities of the conjugates were also calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02042005
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  • 4
    Electronic Resource
    Electronic Resource
    Untersuchungen an Thermoelementen aus dem System Iridium-Rhenium (1956)
    Springer
    The European physical journal 144 (1956), S. 256-262 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Die Thermospannungen von. Ir, Re und von Legierungen des Systems Ir-Re gegen W wurden bis 2450° C gemessen. Die obere Grenze für die Verwendbarkeit derartiger Thermoelemente dürfte je nach der Kombination zwischen 2000 und 2400° C liegen. Aus den systematischen Untersuchungen, die sich über das ganze Konzentrationsintervall erstreckten, ergibt sich als besonders geeignetes Thermopaar: Ir gegen IrRe 70 (mit 70 Gew.-% Re). Dieses Thermopaar könnte auch noch an leicht oxydierender Atmosphäre bei vertretbarer Lebensdauer zu reproduzierbaren Temperaturmessungen wenig oberhalb 2000° C verwandt werden, da sich bei der bevorzugten Re-Verflüchtigung über Oxydbildung eine Verminderung der Re-Konzentration des Re-Mischkristalls um 10 bis 15% nur in einer verhältnismäßig geringen Temperaturfehlanzeige bemerkbar machen würde (etwa 30° C bei 2000° C).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01327087
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  • 5
    Electronic Resource
    Electronic Resource
    Über die Isolierung einer bisher unbekannten aromatischen Aminosäure aus den Samen von Agrostemma githago (1957)
    Springer
    Naturwissenschaften 44 (1957), S. 422-422 
    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/BF00623882
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  • 6
    Electronic Resource
    Electronic Resource
    Beitrag zur Ätiologie von Lichtdermatosen (1959)
    Springer
    Archives of dermatological research 208 (1959), S. 181-191 
    Details
    ISSN: 1432-069X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Um festzustellen, ob die abnorme Reaktion der Haut bei Lichtdermatosen auf einer gesteigerten bzw. herabgesetzten Lichtdurchlässigkeit beruht, wurden spektralanalytische Lichtdurchlässigkeitsmessungen an 17 Epidermisproben vorgenommen. Diese Epidermis stammte von 9 Lichtkranken und 8 Kontrollpersonen, sie wurde den Lichtkranken in Chloräthylvereisung an identischen Stellen der Unterarmstreckseite im Frühjahr entnommen. Bis auf 2 Xeroderma pigmentosum-Fälle, bei denen eine gesteigerte Lichtdurchlässigkeit gefunden wurde, wiesen die übrigen Lichtkranken und die Kontrollen keine abnormen Durchlässigkeiten auf. Die Lichtabsorption war in hohem Grade von der Epidermisdicke abhängig. Die chromatographische Aminosäurenanalyse dieser Epidermisproben ergab bei sämtlichen Hautkranken im Gegensatz zu den Hautgesunden einen auffallend hohen Gehalt an Phenylalanin. Die Epidermis von 4 Fällen von cutaner Porphyrie wies einen hohen Gehalt an Tyrosin auf, während Methionin und Phenylalanin fehlten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00478445
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  • 7
    Electronic Resource
    Electronic Resource
    Cadmium and copper levels in seals, penguins and skuas from the Weddell Sea in 1982/1983 (1986)
    Springer
    Polar biology 5 (1986), S. 139-143 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Samples of muscle, liver and kidney of Weddell and crabeater seals, Adélie and emperor penguins, and McCormick's skuas collected in the Weddell Sea in the summer 1982/83 were analysed for cadmium and copper. In general, the study aimed at contributing to the establishment of base-line data on potential pollutants in Antarctic ecosystems. In particular, it aimed at increasing the amount of data on Cd and Cu levels in the same species that that had been collected and analysed two years eralier, thus improving the possibility of statistical analyses into relationships between metal contents and biological parameters or sampling-sites of the animals, but the data basis is still too small for the letter purpose. In all species together, concentration ranges (on dry weight basis) were 0.16–0.77, 3.7–96.8 and 15.6–491 mg cadmium and 1.6–21.4, 14.9–149 and 12.6–47.7 mg copper per kg in muscles, livers and kidneys, respectively. The relatively high levels of both metals in all species analysed, in connexion with the available literature, suggest that levels in marine mammals and birds can only, if at all, to a minor extent reflect differences in environmental concentrations of these metals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00441693
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  • 8
    Electronic Resource
    Electronic Resource
    Histomorphometry of bone marrow biopsies in chronic myeloproliferative disorders with associated thrombocytosis - features of significance for the diagnosis of primary (essential) thrombocythaemia (1988)
    Springer
    Virchows Archiv 413 (1988), S. 407-417 
    Details
    ISSN: 1432-2307
    Keywords: Chronic myeloproliferative disorders ; Thrombocytosis ; Primary Thrombocythaemia ; Granulo ; Erythrocytopoiesis ; Reticulin Fibers ; Circular Deviation ; Histomorphometry ; Bone marrow biopsies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A histomorphometric analysis was performed on trephine biopsies of the bone marrow in 55 patients with chronic myeloproliferative disorders (CMPDs) and marked thrombocytosis (platelet count exceeding 600 × 109/l). This study aimed at discriminating primary (essential) thrombocythaemia (PTH) from the various other subtypes of CMPDs presenting with thrombocytosis. Following the diagnostic requirements postulated by the Polycythemia-vera-Study-Group for PTH and polycythaemia vera rubra (P.vera) and the generally accepted criteria for the establishment of chronic myeloid leukaemia (CML) and agnogenic myeloid metaplasia (AMM), our cohort of 55 patients was divided into the following subgroups: CML (16 cases), P.vera (11 cases), AMM (13 cases) and finally PTH (15 cases). Histomorphometric measurements revealed that PTH was distinguishable from the other subtypes of CMPDs with respect to several histological variables: patients with PTH had a normal amount of neutrophilic granulo- and erythrocytopoiesis as well as a non-increased content of reticulin (argyrophilic) fibers in contrast to the findings in CML, P.vera and of course AMM. Moreover, sizes of megakaryocytes and their nuclei were significantly greater in PTH and internalization of haematopoietic cells (emperipolesis) was more frequently encountered in comparison with the other subtypes of CMPDs. Deviation of the circular perimeter of megakaryocyte shape was most prominently expressed in CML and AMM, and consequently generated an increased number of a-nuclear cytoplasmic fragments. In contrast to this feature aberration of the nuclei from a circular outline occurred in a less pronounced way in CML, but was excessive in P.vera, AMM and PTH. Our morphometric evaluation demonstrates that certain histological features may serve as a valuable aid in discriminating PTH from the other occasionally thrombocythaemic subtypes of CMPDs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00716989
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  • 9
    Electronic Resource
    Electronic Resource
    Über isolierte Frakturen des Sitzbeines und Apophysenlösungen am Tuber ossis ischii (1956)
    Springer
    Archives of orthopaedic and trauma surgery 48 (1956), S. 326-339 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Es wird auf die Häufigkeit der Beckenbrüche im allgemeinen und anschließend auf die isolierten Verletzungen des Sitzbeines eingegangen, die zu den seltenen Ereignissen gehören. Die Sitzbeinverletzungen werden in 2 Gruppen eingeteilt, von denen die eine durch direkte Gewalteinwirkung, die andere durch Muskelzugwirkung der Unterschenkelbeuger entsteht. Bei der Durchsicht der Literatur fanden sich 9 Fälle, die zu der ersten und 14 Fälle, die zu der zweiten der genannten Gruppen gehören. Bei 13 Fällen der zweiten Gruppe handelte es sich um Lösungen der Sitzbeinapophyse, während nur ein Fall als echte Abrißfraktur des Sitzbeinhöckers anzusehen war. Es wird auf die Ursachen der Apophysenlösungen am Tuber ischiadicum, auf die Symptome und die Behandlung eingegangen. Anschließend wird über zwei selbst beobachtete Fälle berichtet. Zum Schluß wird der Fall eines 16jährigen Mädchens veröffentlicht und zur Diskussion gestellt, dessen Krankheitsbild an die sog. Osteochondropathia ischiopubica erinnert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00415969
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  • 10
    Electronic Resource
    Electronic Resource
    Computertomography in subarachnoid haemorrhage and aneurysm (1982)
    Springer
    Acta neurochirurgica 63 (1982), S. 17-22 
    Details
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 59 patients with SAH and an aneurysm were investigated by CT and angiography. In the 59 patients 67 aneurysms were found. The mean interval between SAH and CT was 8 days, between SAH and angiography 11 days. Blood in the CSF space was visualized up to the 9th day in the patients and 67% of those investigated showed blood in the CSF-space in the CT. In 31% of the patients an aneurysm, in 29% an intracerebral haemorrhage and in 19% a recent infarct was found. A hydrocephalus was seen in 13% of the patients. Of 12 patients with recent infarcts 8 showed vasospasm which correlated in time and location with the infarct.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01728850
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