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  • 1985-1989  (3)
  • 1988  (3)
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  • 1985-1989  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Metasomatised and veined upper-mantle xenoliths from Pello Hill, Tanzania: evidence for anomalously-light mantle beneath the Tanzanian sector of the East African Rift Valley (1988)
    Springer
    Contributions to mineralogy and petrology 100 (1988), S. 510-527 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Peridotite xenoliths from the Pello tuff cone in the Rift Valley of northern Tanzania, bear witness to upper mantle veining and metasomatism. Veins of katungite composition, with an asthenospheric signature, have imposed K, Fe, Ti, OH and REE metasomatism upon previously depleted peridotite. Chemical and mineralogical gradients are present in the peridotite wall rocks, and hydrous phases developed in the peridotite are generally lower in Ti and Fe, but higher in Mg and Cr, than those in the veins. The metasomatism has reduced the density of affected peridotite by up to 4.5%, supporting earlier geophysical models for low-density mantle beneath the Rift Valley. Age constraints for the metasomatically-induced density decrease permit correlation with Recent faulting in the Rift Valley, but not with the major upwarp of the Kenya Dome in the late Tertiary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371380
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Platelet activating factor as a mediator of equine cell locomotion (1988)
    Springer
    Veterinary research communications 12 (1988), S. 101-107 
    Details
    ISSN: 1573-7446
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Equine polymorphonuclear (PMN) and mononuclear (MN) leucocytes were separated on Percoll gradients and used to study the chemoattractant properties of the polar ether-linked phospholipid, platelet activating factor (PAF). Six concentrations of PAF ranging from 1 ng/ml to 100 μg/ml were studied in each of two in vitro assay systems, the agarose microdroplet and a microfilter technique. Very significant (p〈0.01) increases in the movement of both PMN and MN cells were obtained with most concentrations of PAF. In two instances there was no apparent concentration-response relationship, although the action of PAF was approximately bell-shaped in two others. The possible significance of these findings for equine inflammatory conditions is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00362788
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    What stops the flow of blood from the heart? (1988)
    Springer
    Heart and vessels 4 (1988), S. 241-245 
    Details
    ISSN: 1615-2573
    Keywords: Aorta ; Waves ; Flow deceleration ; Energy flux ; Left ventricle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The determinants of aortic pressure and flow are generally studied using impedance methods, the results of which indicate that reflected waves are important, particularly during aortic flow deceleration. An alternative analysis of measured aortic pressure and velocity, using the method of characteristics to calculate the energy flux per unit area of the waves, suggests a different conclusion. We suggest that aortic deceleration is caused by a discrete expansion wave propagating from the left ventricle, and that energy thus recovered by the ventricle may be coupled to early filling of the ventricle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02058593
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    Paper (German National Licenses)
    Fulltext
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