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  • 1970-1974  (790)
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Years
Year
  • 1
    Monograph available for loan
    Monograph available for loan
    New York, NY [u.a.] : MacGraw-Hill
    Call number: G 7141 ; 9692
    Type of Medium: Monograph available for loan
    Pages: XVI, 622 S. : Ill., graph. Darst., Kt.
    Edition: 2. ed.
    ISBN: 0070321485
    Series Statement: MacGraw-Hill international series in the earth and planetary sciences
    Location: Upper compact magazine
    Location: Upper compact magazine
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    New York [u.a.] : McGraw-Hill
    Call number: MOP 43707
    Type of Medium: Monograph available for loan
    Pages: XIII, 412 S. : graph. Darst.
    ISBN: 0070408912
    Series Statement: McGraw-Hill series in geography
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 19 (1970), S. 335-346 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Kristallfeld-Berechnungen mit einem Kovalenz-Parameter werden an sechzehn oktaedrischen Komplexen durchgeführt. Die dem Experiment angepaßten Variablen wurden mit theoretischen Parametern in Beziehung gesetzt.
    Notes: Abstract The use of a covalency parameter in Crystal Field Theory calculations has been applied to sixteen octahedral complexes. The variables fitted to experiment have been correlated to theoretical parameters.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A consistent set of 4s, 4p, and 3d orbitals are reported that are linear combinations of Slatertype functions for the highest multiplicity term of the configurations 3d n−2 4s 14p 1 for the metals titanium through copper.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 19 (1972), S. 1-28 
    ISSN: 0945-3245
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Collocation with piecewise polynomial functions is developed as a method for solving two-point boundary value problems. Convergence is shown for a general class of linear problems and a rather broad class of nonlinear problems. Some computational examples are presented to illustrate the wide applicability and efficiency of the procedure.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 20 (1973), S. 0 
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The experimental evaporation of brine in shallow vessels shows that layered halite can form by the overgrowth of crystals in mats that have foundered from their initial position of growth at the brine-air interface; by the upward and lateral growth of crystals that have nucleated on the floor; and by the overgrowth on detrital halite. Each of these processes, and its resultant crystal fabric, is described in relation to the environmental factors which influence it.The fabrics of primary halite crystals in layered halite-rock and associated deposits from the Lower Keuper Saliferous Beds of the Cheshire Basin are described and compared with those of the experimentally produced halite. Some of the ancient halite-rock may be matched with floor-nucleated crystals, and some with detrital halite; none can be shown to have grown from foundered mats. The halite-rock is regarded as having formed in shallow brine bodies, perhaps only a few centimetres deep, but of unknown extent, whilst the presence of planar solution or deflation surfaces at the top of the layered units, and disruptions in bedding similar to buckled salt-crust structures, point to periodic and perhaps prolonged emergence.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-0827
    Keywords: Pyrophosphate ; Bone ; Cartilage ; Calcification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Les concentrations de pyrophosphate inorganiques (PPi), d'orthophosphate et de calcium ont été déterminées dans le cartilage au repos, en prolifération, hypertrophique et calcifié au niveau d'épiphyses foetales de veaux et aussi dans l'os spongieux, périosté et compact. Dans les échantillons de cartilage, le contenu en PPi augmente progressivement dans l'ordre énoncé ci-dessus, de 8.59 μg P/g en poids sec de cartilage au repos à 236 μg P/g en poids sec dans le cartilage calcifié. Cependant, le rapport PPi sur orthophosphate suit une relation inverse: il est plus élevé dans la zone de repos et diminue considérablement lorsque le tissu se calcifie. Le rôle possible du PPi, en inhibant la précipitation de phosphate de calcium amorphe (ACP) et en ralentissant la transformation d'ACP en hydroxyleapatite (HA) dans les tissus calcifiés, est envisagé par rapport à d'autres facteurs, tels que le collagène, le magnésium, les phospholipides et les protéines-polysaccharides, qui peuvent aussi intervenirin vivo. Pour l'instant, aucun facteur isolé ne peut être considéré comme un régulateur physiologique certain.
    Abstract: Zusammenfassung Der Gehalt an anorganischem Pyrophosphat (PPi), Orthophosphat und Calcium wurde in ruhendem, proliferierendem, hypertrophischem und verkalktem Knorpel von foetalen Kalbsepiphysen und auch in spongiösem, periostalem und kompaktem Knochen gemessen. Bei den Knorpelproben nahm der Gehalt an PPi progressiv in der oben angegebenen Reihenfolge zu: von 8,59 μg P/g Trockengewicht in ruhendem Knorpel bis zu 236 μg P/g Trockengewicht in verkalktem Knorpel. Das PPi/Orthophosphat-Verhältnis hingegen verlief in umgekehrter Richtung; es war am höchsten in der ruhenden Zone und nahm dramatisch ab, wenn das Gewebe verkalkte. Die mögliche Rolle von PPi bei der Hemmung der Ausfällung von amorphem Calciumphosphat (ACP) und bei der Verlangsamung der Umwandlung von ACP in Hydroxyapatit (HA) in verkalkenden Geweben wird in bezug auf folgende anderen Faktoren, welche den Vorgang in vivo ebenfalls beieinflussen könnten, diskutiert: Collagen, Magnesium, Phospholipide und Proteinpolysaccharide. Bis jetzt war es nicht möglich, einen einzelnen Faktor als sicheren physiologischen Regulator zu identifizieren.
    Notes: Abstract The amounts of inorganic pyrophosphate (PPi), orthophosphate and calcium have been measured in resting, proliferating, hypertrophic and calcified cartilage from foetal calf epiphyses and also in cancellous, periosteal and compact bone. In the cartilage samples, the content of PPi increased progressively in the order named above, from values of 8.59 μg P/g dry weight in resting cartilage to 236 μg P/g dry weight in calcified cartilage. However, the ratio of PPi to orthophosphate followed the reverse relationship and was highest in the resting zone and fell dramatically as the tissue calcified. The possible role of PPi in inhibiting the precipitation of amorphous calcium phosphate (ACP) and in the slowing the transformation of ACP to hydroxyapatite (HA) in calcifying tissues is discussed in relation to other factors, such as collagen, magnesium, phospholipids and proteinpolysaccharides, which might also influence the processin vivo. At present, no single factor can be identified as a proven physiological regulator.
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  • 9
    ISSN: 1432-0827
    Keywords: Diphosphonates ; Calcitonin ; Parathyroid hormone ; Bone resorption ; Tissue culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé L'effet de la parathormone, de la calcitonine et du dichloromethylenediphosphonate sur la résorption osseuse, la production de lactate et le contenu en phosphatases alcaline et acide aussi bien que celui en pyrophosphatases alcaline, neutre et acide dans une culture de calvaria de souris a été étudié. La parathormone augmente touts ces paramètres. La calcitonine prévient l'augmentation de la libération du45Calcium et du lactate, mais ne prévient pas l'augmentation des différents enzymes. Le diphosphonate lui prévient en plus l'augmentation de la phosphatase et pyrophosphatase acide.
    Abstract: Zusammenfassung Die Wirkung von Parathormon, Calcitonin und Dichloromethylen-Diphosphonat auf Knockenresorption, Lactatbildung und den Gehalt an alkalischer und saurer Phosphatase sowie an alkalischer, neutraler und saurer Pyrophosphatase in gezüchteten Mäuse-Calvarien wurde untersucht. Parathormon erhöhte alle diese Parameter, Calcitonin verhinderte die Erhöhung von45Calcium-und Lactatfreisetzung, aber nicht die Zunahme der verschiedenen Enzyme. Das Diphosphonat jedoch verhinderte zudem noch die Erhöhung der sauren Phosphatase und Pyrophosphatase.
    Notes: Abstract The effect of parathyroid hormone, calcitonin and dichloromethylenediphosphonate (Cl2MDP) on bone resorption, lactate production and the content of alkaline and acid phosphatases and alkaline neutral and acid pyrophosphatases in mouse calvaria in culture was investigated. Parathyroid hormone increased all measured variables. Calcitonin prevented the increase in45Ca release and lactate production but not the increase in the various enzymes. The diphosphonate prevented the increase in45Ca release and lactate production but in addition prevented the increase in acid phosphatase and pyrophosphatase.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A Precambrian hypabyssal rhyolite porphyry in central Texas has retained its original texture, although alkali feldspar phenocrysts have inverted and unmixed from zoned, single-phase high-temperature feldspar to zoned microperthite with an intermediate microcline host. Blue quartz phenocrysts owe their color to dispersion by zircon inclusions. Neutron activation analysis reveals substitution of tetravalent cations for silicon in the quartz. In two outcrops, quartz and albite have been completely leached from the rock and K-feldspar added, leaving the texture intact. The leaching was most likely accomplished by residual brine from an overlying Lower Cretaceous evaporite deposit subsequently removed by erosion.
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