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  • 1975-1979  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 24 (1975), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A detailed time study of the incorporation of label from sodium-[1-14C]acetate, [1-14C]ethanol, and [2-14C]glucose into the aspartyl moiety of N-acetylaspartic acid (NAA) was conducted. As expected the specific activity of aspartate increased rapidly with time and peaked within 15-20 min after which it fell sharply; but significantly, that of the aspartyl moiety of NAA rose very slowly even after the specific activity of aspartate had fallen to less than 1 per cent of the peak values.A rat brain microsomal free supernatant preparation was shown enzymatically to incorporate label from sodium-[1-14C]acetate into the t-RNA fraction from which was isolated N-[1-14C]acetylaspartic acid. From these observations we were inclined to speculate that NAA-t-RNA may serve as an initiator of neuronal protein synthesis.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Contributions to mineralogy and petrology 56 (1976), S. 157-172 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Peuyuk kimberlite is divisable into three petrographically distinct phases (A, B, and C) on the basis of oxide mineralogy and the presence or absence of an immiscible carbonate liquid. Phase A contains spinels (titan-magnesian-aluminous chromite) and perovskite with no reaction rims or complex mantles, and no evidence of an immiscible carbonate liquid. Phase B contains complexly zoned and mantled oxides with no evidence of an immiscible carbonate liquid. The spinels are zoned from titan-magnesian-aluminous chromite to members of the magnesian ulvospinel-ulvospinel-magnetite series. The zoned spinels are mantled by a serpentine-carbonate mixture followed by a mixture of Ti free magnetite and minor rutile. Perovskites are mantled by nickeliferous pyrite (0–11 % Ni) and rutile. Phase C is characterized by the presence of an immiscible carbonate liquid. Spinels are either discrete crystals of magnesian ulvospinel-ulvospinel-magnetite or as discrete rims of this composition upon cores of titan-magnesian-aluminous chromite. Rutile rims are poorly developed upon perovskites. Sulphides associated with the silicate groundmass are Cu-pentlandite, heazle-woodite and chalcopyrite. Nickeliferous pyrite is associated with the carbonate fraction. Common to all phases of the intrusion is a red titanium poor aluminous-magnesian chromite which is interpreted to have formed prior to the fluidized intrusion of the kimberlite. All other spinels being considered to have crystallized after fluidization. The spinel composition trends may reflect decreasing oxygen fugacities (10−19 to 10−22 bars) in response to falling temperatures (800–600° C) along the quartz-fayalite-magnetite buffer. In the immediate post-fluidization history of the diatreme all phases crystallized titan-magnesian-aluminous chromite but the trends of Ti and Fe enrichment observed in phases B and C was prevented in phase A possibly by rapid cooling. Slower cooling coupled with reaction of earlier formed phases with residual H2O and CO2 rich fluids resulted in the phase B assemblage. Extensive reaction of this type was prevented in phase C by the separation of an immiscible carbonate liquid.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 274 (1978), S. 670-671 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] One purpose of our measurements has been to detect oscillations associated with the brightness changes of the Sun, related, for example, to the well-known 5-min period of photospheric spectral line variations. Two-colour brightness and polarisation data were obtained while our polarimeter1 was ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Contributions to mineralogy and petrology 56 (1976), S. 279-287 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Accessory andalusite has been found in some late-stage granitic differentiates of the South Mountain batholith. The andalusite is petrographically distinct from the andalusite of the thermal aureole, and it occurs in regions of the batholith which show little evidence of contamination by the country rocks. Analyses of biotites from andalusite-bearing and andalusite-free phases suggest that those coexisting with andalusite actually grew in equilibrium with the andalusite. It is concluded that magmatic andalusite must be confined mainly to water-saturated, peraluminous, epizonal granites, and some possible P-T paths for the crystallization of magmatic andalusite are considered.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 31 (1975), S. 1098-1100 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Changes in MAO activity after hypophysectomy (HX) are not due to adrenal insufficiency. ACTH failed to reverse the effects of HX and enhanced the depression of cardiac and spleenic MAO. The data suggests both facilitatory and inhibitory effects of pituitary hormones on MAO activity.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Philosophia 6 (1976), S. 359-362 
    ISSN: 1574-9274
    Source: Springer Online Journal Archives 1860-2000
    Topics: Philosophy
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Philosophia 5 (1975), S. 417-427 
    ISSN: 1574-9274
    Source: Springer Online Journal Archives 1860-2000
    Topics: Philosophy
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Philosophia 6 (1976), S. 505-540 
    ISSN: 1574-9274
    Source: Springer Online Journal Archives 1860-2000
    Topics: Philosophy
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Philosophia 8 (1979), S. 599-614 
    ISSN: 1574-9274
    Source: Springer Online Journal Archives 1860-2000
    Topics: Philosophy
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Ocean dynamics 28 (1975), S. 168-179 
    ISSN: 1616-7228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Vollständige Lösungen der linearisierten Gleichungen langer Wellen werden für Randwellen über einem Schelf mit exponentiellem Tiefenprofil angegeben. Ohne die horizontale Divergenz zu vernachlässigen, werden für beide Klassen — d.h. hochfrequente Trägheits-Schwere-Wellen und niederfrequente quasi-geostrophische Wellen — analytische Ausdrücke gefunden. Für beide Klassen wird die Dispersions-relation bestimmt und für den quasi-geostrophischen Fall mit der schon früher-unter Vernachlässigung horizontaler Divergenz — bekannten Relation verglichen, dabei wird Übereinstimmung auf drei Stellen genau gefunden und somit die Vernachlässigung horizontaler Divergenz im Meer für diese Klasse von Randwellen gerechtfertigt. Der Kontinentalschelf vor Sidney hat näherungsweise ein exponentielles Profil, Dispersionskurven für beide Klassen von Randwellen werden für diesen Schelf endlicher Breite angegeben. Randwellen über einem Schelf unendlicher Breite werden betrachtet und die Dispersionskurven mit denen für den Schelf vor Sidney verglichen. Quasi-geostrophische Wellen existieren nicht über einem unendlich breiten Schelf, die Dispersionskurven für die Trägheits-Schwere-Wellen sind fast identisch bis auf die Tatsache, daß bei einem Schelf endlicher Breite eine obere Schranke im Hochfrequenten existiert. Auch die Variation der Schelfparameter wird betrachtet und folgendes festgestellt: (1.) die Dispersionskurven hängen empfindlich von der Wassertiefe an der Küste ab, (2.) die Dispersionskurven reagieren nicht sehr empfindlich auf eine Variation der Schelfbreite und (3.) die Lage der Maxima der Dispersionkurven—d.h. die Lage des Punktes, für den die Gruppengeschwindigkeit gleich Null ist—reagiert sehr empfindlich auf Änderungen der Wassertiefe an der Küste.
    Abstract: Résumé Les équations linéarisées d'ondes longues sont entièrement résolues pour les ondes de plateau sur un plateau exponentiel. Des formes analytiques sont trouvées pour l'une et l'autre catégories, c'est-à-dire pour les ondes à haute fréquence d'inertie gravitationnelle et les ondes à basse fréquence quasi — géostrophiques, sans négliger la divergence horizontale. Une relation de dispersion pour chaque catégorie est déterminée, et celle pour les ondes de plateau quasi-géostrophiques dans l'océan, est comparée avec la relation déjà connue, obtenue en négligeant la divergence horizontale. L'accord est trouvé pour 3 chiffres significatifs justifiant ainsi le fait de négliger la divergence horizontale dans l'océan pour cette catégorie d'onde de plateau. Le plateau continental au large de Sydney a approximativement un profil exponentiel et des courbes de dispersion sont présentées pour l'une et l'autre catégories d'ondes de plateau en supposant que le plateau est de largeur finie. Des ondes de plateau sont envisagées sur un plateau de largeur infinie et des courbes de dispersion sont comparées pour le plateau au large de Sydney. Les ondes quasi-géostrophiques n'existent pas sur le plateau de largeur infinie; les courbes de dispersion pour les ondes d'inertie gravitationnelle sont presque identiques sauf que, pour le plateau de largeur finie, il existe une coupure des hautes fréquences. La variation des paramètres du plateau est aussi considérée et il est trouvé que (1.) les courbes de dispersion sont sensibles aux variations de profondeur à la côte, (2.) les courbes de dispersion ne sont pas très sensibles aux variations de la largeur du plateau, et (3.) la position du groupe de vitesse nulle est très sensible aux variations de la profondeur à la côte.
    Notes: Summary The linearized long wave equations are solved fully for edge waves over an exponential shelf. Analytic forms are found for both classes, i.e. the inertiogravitational high frequency and the quasi-geostrophic low frequency waves, without neglecting the horizontal divergence. A dispersion relation for each class is determined and that for the quasi-geostrophic edge waves in the ocean is compared with the previously known relation which was obtained by neglecting the horizontal divergence. Agreement is found to 3 sig. figs. thereby justifying the neglect of horizontal divergence in the ocean for that class of edge wave. The continental shelf off Sydney has approximately an exponential profile and dispersion curves are presented for both classes of edge waves assuming the shelf is of finite width. Edge waves are considered over a shelf of infinite width and dispersion curves compared for the shelf off Sydney. The quasi-geostrophic waves do not exist on the shelf of infinite width; the dispersion curves for the inertiogravitational waves are almost identical except that, for the shelf of finite width, there exists a high frequency cut-off. Variation of the shelf parameters is also considered and it is found that (1.) dispersion curves are sensitive to changes in the depth at the shore, (2.) dispersion curves are not very sensitive to changes in the shelf width, and (3.) the position of zero group velocity is very sensitive to changes in the depth at the shore.
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