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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 216 (1968), S. 229-231 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theβ + spectrum of22Na has been measured with the Heidelberg (π/2) √13 iron-freeβ-ray spectrometer. Particular attention was paid to the upper end of the continuum. The maximum energy was found to beE max=(545.7 ±0.5) keV. The rest mass of the neutrino connected withβ + decay was found to be zero with an upper limit of 4.1 keV (67 per cent confidence).
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  • 2
    ISSN: 1434-601X
    Keywords: 23.20.Lv ; 27.60+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 117Te has been studied via82Se(40Ar,5n)117Te, and a new, substantially extended level scheme is proposed to I≈53/2. Our TRS calculations suggest rotational bands, but with an experimental sensitivity of ≈2%, we see none. Our results differ from those of Sharma, et al, who report two isolated E2 bands. We find them less band-like, being joined at the top and changed in content and order. We suggest a noncollective oblate shape for a new 39/2− level.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 23 (1972), S. 1023-1023 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 23 (1972), S. 167-167 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 28 (1972), S. 193-193 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Hämsynthetase (HS)-Aktivität zirkulierender Retikulozyten und Erythrozyten von Normalspendern und Patienten mit Thalassämie wurde in vitro bestimmt. HS war normal oder erhöht bei Thalassämie. Jugendliche, über das Stadium des Retikulozyten hinaus gereifte Erythrozyten enthalten wahrscheinlich noch einen signifikanten Anteil der im peripheren Blut messbaren HS-Aktivität.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 32 (1976), S. 397-398 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Addition of human placental umbilical cord serum to bone marrow cultures reproducibly increased the number of granulocyte colonies in vitro. This stimulatory effect was significantly greater than that of fetal calf serum which was seen in cultures of human bone marrow under the conditions described.
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  • 7
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 36 (1980), S. 1122-1124 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Dextran, glycerol and dimethyl sulfoxide (DMSO), alone or in combination, were used for cryoprotection of human bone marrow cells. The viability of cryopreserved cells was assessed by culture of myelopoiesis-committed stem cells (CFU-c) in vitro. A significantly better protection against freezing injury was obtained by 9% dextran in combination with 3 or 5% DMSO, and also with 5 or 10% DMSO alone, than with either 15% glycerol or 9% dextran with 1% DMSO.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 28 (1972), S. 1-7 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Blut gerinnt, wenn das Gerinnungsferment Thrombin aktiviert wird und Fibrinogen in Fibrin umwandelt. Störungen der Thrombin- oder Fibrinbildung können Bluterkrankheiten verursachen. Die Ursache angeborener Bluterkrankheiten liegt entweder in der quantitativen Verminderung oder in qualitativen Strukturanomalien eines Gerinnungsfaktors. Immunologische Methoden im Verein mit einer beginnenden, direkten Strukturabklärung zeigten für das Fibrinogen überzeugend, dass beide Möglichkeiten vorkommen. Unterschiedliche Funktionsausfälle von Fibrinogen lassen vermuten, dass verschiedenartigen Strukturanomalien für Störungen der Substrateigenschaften gegenüber Thrombin, der Polymerisierung oder der Fibrinstabilisierung verantwortlich sind. Ähnliche Untersuchungen an den Faktoren II, VII, VIII, IX, X und XIII zeigen, dass wahrscheinlich die Mehrzahl der bekannten Bluterkrankheiten durch Strukturanomalien verursacht werden. Die eingehende Untersuchung solcher Strukturdefekte wird zukünftig um so interessanter und bedeutungsvoller werden, je besser die Struktur und Funktion der normalen Gerinnungsfaktoren bekannt sind.
    Notes: Summary Blood coagulation reflects, the complex biological system resulting in the formation of thrombin and the subsequent conversion of fibrinogen into fibrin. Disorders of either thrombin or fibrin formation may cause bleeding states. Congential hemorrhagic disorders are characterized by either reduction of a coagulation factor or impairment of its functional capacity by structural aberrations. Immunological studies and direct molecular evaluation of fibrinogen demonstrate that both types of abnormalities occur. Functional evaluation of abnormal fibrinogens suggests that many different structural variants exist and variably influence interaction with thrombin, fibrin polymerization and fibrin ‘stabilization’. Similar studies performed on factors II, VII, VIII, IX, X and XIII indicate that qualitative abnormalities are more frequent than ‘true’ deficiency states. Such molecular abnormalities will become increasingly interesting and important as the biochemistry of normal coagulation progresses.
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  • 10
    ISSN: 1432-1939
    Keywords: Monoterpene indole alkaloids ; Tropical trees ; Abiotic factors ; Growth ; C/N balance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The growth of Tabernaemontana pachysiphon (Apocynaceae) plants and the alkaloid content of leaves were investigated in the greenhouse at three levels of nutrient supply under two contrasting water and light regimes. We determined height increment, above-ground biomass production, leaf size, specific leaf weight and the content of the alkaloids apparicine, A2, isovoacangine, tubotaiwine and tubotaiwine-N-oxide. The effects of major controlling factors such as light, water and nutrient supply could be directly correlated with growth and were largely independent of each other. In contrast, leaf-alkaloid contents were influenced by interdependencies among the main factors and individually affected in a synergistic or antagonistic manner which deviated from the effects on growth. The following general trends could be identified with respect to the quantitatively predominant alkaloids apparicine, tubotaiwine and isovoacangine. Increasing nutrient supply had a positive effect on both growth and alkaloid content. Drought increased alkaloid content, but retarded growth. High light intensity lowered alkaloid content but promoted growth. We investigated the relationship between primary production and the production of secondary metabolites with respect to relative and total alkaloid content as well as in relation to the leaves' nitrogen status. Our results showed that under conditions of low nutrient supply, higher proportions of leaf nitrogen were allocated to alkaloids than at moderate or high nutrient supply. Under conditions of drought and low light, all plants allocated almost equal proportions of leaf nitrogen to alkaloids, regardless of fertiliser. Total alkaloid content per plant, however, increased with fertilisation. With respect to the N-allocation strategy, we found no indication of a trade-off between primary production and the production of secondary metabolites in this species. Rather, our results are in accordance with the carbon nutrient balance hypothesis.
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