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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 50 (1992), S. 105-106 
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0827
    Keywords: Bone ; Osteodystrophy ; Hyperparathyroidism ; Resorption ; Osteoclasts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé La profondeur moyenne de l'os érodé, par unité de temps, au niveau de centres de résorption, est musurée sur des biopsies osseuses, marquées à la tétracycline et prélevées au niveau de 16 patients en dialyse rénale périodique, d'un adolescent présentant un rachitisme rénal et de l'hyperparathyroidie secondaire, et de 2 femmes adultes atteintes d'hyperparathyroidie primitive. L'index de résorption cellulaire est sub-normal au niveau des surfaces d'os haversien de tous les groupes. Il est sub-normal au niveau des surfaces osseuses de l'endoste cortical dans le groupe sous dialyse. Le matériel biopsique était insuffisant pour établir l'index dans les deux autres groupes. Il apparait ainsi que les ostéoclastes individuels, provenant de cas d'hyperparathyroidie de longue durée, résorbent l'os plus lentement que dans des conditions normales.
    Abstract: Zusammenfassung Die mittlere Tiefe von Knochenerosionen, die pro Zeiteinheit in den Resorptionszentren entstanden, wurde in Tetracyclin-markierten Knochenbiopsien gemessen. Die Biopsien stammten von 16 erwachsenen, periodisch hämodialysierten Patienten, ferner von einem Jugendlichen mit renaler Rachitis und sekundärem Hyperparathyreoidismus sowie von zwei erwachsenen Frauen mit erwiesenem Hyperparathyreoidismus. Dieser Index der Resorption auf cellulärer Ebene war in allen Gruppen subnormal, wenn er auf der Innenschicht der Haverschen Kanäle bestimmt wurde. Er war ebenfalls subnormal in der Gruppe dialysierter Patienten auf die cortico-endostale Knochenoberfläche bezogen. Bei den anderen zwei Gruppen konnte der Index für die letztgenannte Oberfläche nicht bestimmt werden, da zu wenig Material vorlag. Diese Resultate lassen vermuten, daß einzelne Osteoklasten in Fällen von langdauerndem Hyperparathyreoidismus beim Menschen den Knochen langsamer resorbieren als dies normalerweise der Fall ist.
    Notes: Abstract The mean depth of bone eroded in unit time at resorption centers was measured in tetracycline-labeled bone biopsies of 16 adult patients on periodic renal dialysis, of one adolescent boy with renal rickets and secondary hyperparathyroidism, and of two adult women with proven primary hyperparathyroidism. This index of cellular-level resorption was subnormal on haversian bone surfaces in all groups, and it was subnormal on cortical-endosteal bone surfaces in the dialysis group; there was insufficient material to evaluate the index on this latter surface in the other two groups. The results suggest that individual osteoclasts resorb bone more slowly than normal in naturally occurring human hyperparathyroid states of long standing.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 52 (1993), S. 1-4 
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Conclusion By 1990, the work and thought of legions led to a new paradigm of skeletal biology [1, 2, 8, 15–27]. It is not the product of one man or group, even though one group wrote more about it than others. Its strength and potential usefulness lie more in its basic concepts, the “common denominators” or connections in diverse facts, than in the facts themselves. It melds ideas and information from many branches of skeletal science so it has multidisciplinary roots and one could say its concepts lie on many “shelves” (including, in part anatomic, biochemical, biomechanical, cell biologic, clinical, and pathologic ones). It still evolves; it is fluid. This article offers a brief look at some concepts on its vital biomechanical shelf [28]. They can suggest the skeleton's mechanical usage story is more deeply involved in supposedly “medical” skeletal affections than anyone suspected a decade or more ago.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 28 (1979), S. 181-200 
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 12 (1973), S. 137-142 
    ISSN: 1432-0827
    Keywords: Primary Hyperparathyroidism ; Bone Dynamics ; Tetracycline ; Labeling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Des biopsies non décalcifiées de côtes, marquées à la tétracycline, de 7 patients atteints d'hyperparathyroidisme primaire clinique et d'adénomes des parathyroides, sont examinées histologiquement pour étudier les remaniements osseux, imputables à la parathormone. De grandes variations imprévues du remaniement osseux statique et dynamique ont été notées dans ce groupe de patients cliniquement identiques. Il est difficile d'expliquer ces faits de façon satisfaisante.
    Abstract: Zusammenfassung Unentkalkte Tetracyclin-markierte Rippenbiopsien von 7 Patienten mit klinisch manifestem primären Hyperparathyreoidismus und nachgewiesenem Nebenschilddrüsenadenom werden histologisch auf den Einfluß des Parathormons auf den Knochenumbau untersucht. In dieser Gruppe klinisch gleichartig erkrankter Patienten fanden sich unerwartet große Unterschiede in den einzelnen Parametern des Knochenumbaus. Erklärungen für dieses Verhalten bleiben weiterhin spekulativ.
    Notes: Abstract Undecalcified tetracycline labeled rib biopsies of 7 patients with clinical primary hyperparathyroidism and proven adenoma of the parathyroid glands were examined histologically to study the bone remodeling effects of parathyroid hormone. Unexpectedly wide variations of the static and dynamic bone remodeling data in this group of clinically similar patients was found. Explanations for this conduct still remain highly speculative.
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 182-184 (Feb. 1995), p. 203-206 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 40-42 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A two-dimensional grain growth model is used to study microstructural evolution in thin film strips. We focus on the strip's transformation to the bamboo structure, in which individual grains transverse the width of the strip. We find that the approach to a fully bamboo structure is exponential, and that the rate of transformation is inversely proportional to the square of the strip width. When the simulation is extended to model grain boundary pinning due to grooving at grain boundary−free surface intersections, we find that there exists a maximum strip width to thickness ratio beyond which the transformation to the bamboo structure does not proceed to completion.
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Marine Policy 9 (1985), S. 62-68 
    ISSN: 0308-597X
    Keywords: Biology ; Economics ; Fisheries management
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Political Science , Law
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 62 (1998), S. 89-94 
    ISSN: 1432-0827
    Keywords: Key words: Osteopenia — Osteoporosis — Bone — Physiology — Pharmacology — Biomechanics.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Bone's biologic mechanisms adapt it to meet the needs of its mechanical usage and muscle strength. Modeling by drifts can increase bone strength and ``mass,'' BMU-based remodeling can conserve or reduce them, and neither can do the other's work. Under increasing forces on bone, modeling increases bone strength and ``mass'' and remodeling maintains the extra bone. In disuse, modeling turns OFF and remodeling reduces bone strength and ``mass'' to cause osteopenia. Osteopenia increases bone fragility as does bone microdamage, and they can coexist. Too little bone for one's mechanical usage and muscle strength can cause spontaneous fractures and/or bone pain. The bone-loss and tissue-dynamic patterns in acute and chronic disuse strongly copy the patterns in developing and established osteopenias in known medical conditions. Such things suggest that at least three osteoporosis variants can occur: (1) in physiologic osteopenias, bone strength and ``mass'' would decrease to correspond to reduced muscle strength and physical activity so that spontaneous fractures and bone pain would not occur. An intrinsic bone disorder would not cause this osteopenia, and fractures would only follow injuries, usually of extremity bones. (2) In ``true osteoporosis,'' bone strength and ``mass'' could not meet the needs of muscle strength and physical activities, so that spontaneous fractures and/or bone pain would occur, mainly in the spine. An intrinsic bone disorder would cause this affection. Of course, injuries could fracture extremity bones too. (3) Features of (1) and (2) could combine variably in ``combination states.'' These proposals have implications for the diagnosis, management, and study of the osteoporoses.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 7 (1971), S. 76-80 
    ISSN: 1432-0827
    Keywords: Pickets ; Bone ; Osteocytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Des couronnes périostéocytaires hypominéralisées au niveau de biopsies osseuses pratiquées, chez des patients, atteints de rachitisme résistant à la vitamine D, s'observent plus fréquemment autour d'ostéocytes jeunes que d'ostéocytes âgés. Ce fait indique qu'à un moment donné, cette hyperminéralisation périostéocytaire peut disparaitre et que, par consequence, il existe un intervalle de temps dans la minéralisation de la matrice organique périostéocytaire.
    Abstract: Zusammenfassung Höfe von schwach mineralisierten Periosteocyten werden in Knochenbiopsien von Patienten mit Vitamin D-resistenter Rachitis häufiger rings um die jungen als um die alten Osteocyten beobachtet. Es scheint somit, daß nach einiger Zeit die unvollständige Mineralisation, die auf Grund der Höfe angenommen werden werden kann, einen “Heilungsprozeß” erfährt und daß deshalb eine verzögerte Mineralisation der perlicunären organischen Matrix erfolgt.
    Notes: Abstract Udermineralized periosteocyte haloes in bone biopsies from patients with vtamin D-resistant rickets occur more frequently around young than around old osteocytes, indicating that in time the incomplete mineralization suggested by the haloes, undergoes a “healing” process and therefore there is a delay in the mineralization of the perilacunar organic matrix.
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