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  • Articles  (48)
  • Bone  (48)
  • Springer  (48)
  • American Institute of Physics
  • Blackwell Publishing Ltd
  • Elsevier
  • Springer Nature
  • 1995-1999
  • 1980-1984  (17)
  • 1970-1974  (31)
  • 1960-1964
  • 1950-1954
  • 1981  (17)
  • 1971  (31)
  • 1951
  • Medicine  (48)
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  • Articles  (48)
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  • Springer  (48)
  • American Institute of Physics
  • Blackwell Publishing Ltd
  • Elsevier
  • Springer Nature
Years
  • 1995-1999
  • 1980-1984  (17)
  • 1970-1974  (31)
  • 1960-1964
  • 1950-1954
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Bone photovoltaic cell in hall geometry (1981)
    Springer
    Calcified tissue international 33 (1981), S. 239-242 
    Details
    ISSN: 1432-0827
    Keywords: Bone ; Magnetic field ; IR light ; Light absorption constant ; Efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Enhancement of photovoltage has been found in bone and its two major constituents when placed in a magnetic field in standard Hall geometry. Infrared light has been used for carrier excitation. From data obtained in this manner, values for the light absorption constant, extinction constant, mass absorption constant, and efficiency have been estimated. All these parameters increase with the increase of magnetic field. A possible explanation for the observed phenomena is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02409443
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  • 2
    Electronic Resource
    Electronic Resource
    Studies on the role of 24-hydroxylation of vitamin D in the mineralization of cartilage and bone of vitamin D-deficient rats (1981)
    Springer
    Calcified tissue international 33 (1981), S. 489-497 
    Details
    ISSN: 1432-0827
    Keywords: Vitamin D ; Vitamin D deficiency ; Cartilage ; Bone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary To test the importance of 24-hydroxylation of vitamin D3 on bone mineralization, rat pups born to vitamin D-deficient females were given either 25-hydroxyvitamin D3 or 24,24-difluoro-25-hydroxyvitamin D3 for 16 days beginning at the time of weaning. Following such treatment analysis of blood samples revealed no detectable 24R,25-(OH)2D3 and 1,25-(OH)2D3 in the rats given the difluoro compound while revealing the expected 24,24-difluoro-25-hydroxyvitamin D3 and 24,24-difluoro-1,25-dihydroxyvitamin D3. The rats given 25-hydroxyvitamin D3 had the expected levels of 25-hydroxyvitamin D3, 24,25-dihydroxyvitamin D3, and 1,25-dihydroxyvitamin D3. Following sacrifice at day 17, postweaning bone mineralization and modeling were studied in long bones using histological methods. Bones taken from vitamin D-deficient rats at the beginning and end of the experimental period had lesions typical of rickets. These included wide growth plates, excessive amounts of osteoid, and metaphyseal fibrosis. Following treatment with either 25-hydroxyvitamin D3 or 24,24-difluoro-25-hydroxyvitamin D3, bone mineralization returned to normal. Growth plate widths and the amount of osteoid on bone surfaces were both substantially reduced and to a similar degree in both treatment groups. Normal cartilage core formation and trabecularization of the metaphyseal primary spongiosa were also restored to a similar degree in both groups. In effect, no difference was observed in any bone parameter studied between the 25-hydroxyvitamin D3- and the 24,24-difluoro-25-hydroxyvitamin D3-treated animals. These results provide strong evidence that 24-hydroxylation of the vitamin D molecule plays little or no role in the modeling and mineralization of bone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02409479
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  • 3
    Electronic Resource
    Electronic Resource
    Comparison of 1,25-, 25-, and 24,25-hydroxylated vitamin D3 binding in fetal rat calvariae and osteogenic sarcoma cells (1981)
    Springer
    Calcified tissue international 33 (1981), S. 655-661 
    Details
    ISSN: 1432-0827
    Keywords: 1,25-Dihydroxyvitamin D3 ; 25-Hydroxyvitamin D3 ; 24,25-Dihydroxyvitamin D3 ; Receptors ; Bone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The hormonal metabolite of vitamin D3, 1,25-dihydroxyvitamin D3 [1,25(OH)2D3], exerts its biological effects by binding to a cytosolic receptor protein. Such a protein has been demonstrated in vitamin D3 target organs including fetal rat calvariae and more recently in rat osteogenic sarcoma cells. In this study we have compared the binding of 25-hydroxyvitamin D3 [25(OH)D3] and 24,25-dihydroxyvitamin D3 [24,25(OH)2D3] to that of 1,25-(OH)2D3 in fetal rat calvariae and osteogenic sarcoma (OS) cells. Sucrose density sedimentation, DNA-cellulose chromatography, and intracellular uptake studies have been employed to evaluate these interactions. In cytosol preparations from calvariae, [3H]-1,25(OH)2D3 bound to a 3.3S macromolecule and to a much greater extent to a 5.8S macromolecule while both [3H]25(OH)D3 and [3H]24,25(OH)2D3 bound to the 5.8S macromolecule. By incubating intact calvariae and OS cells with labeled metabolites and thus establishing binding intracellularly prior to cell disruption, we have found that the 3.3S protein which has high specificity for 1,25(OH)2D3 occurs inside the cells; the 5.8S protein, however, does not occur inside the cells but is generated after cell disruption. The [3H]-1,25(OH)2D3-receptor complex adsorbed to DNA-cellulose and was eluted from this affinity resin at 0.28M KCl. In contrast, [3H]25(OH)D3 and [3H]-24,25(OH)2D3 binding activity did not adsorb to DNA-cellulose. We conclude that, in contrast to the 3.3S protein, the 5.8S macromolecule does not fulfill receptor criteria but is rather generated by the experimental manipulation of the bone cells. Our data suggest that the vitamin D3 actions on bone are mediated only via the 3.3S receptor, and hence quantitative but not qualitative differences of the effects of the various metabolites are feasible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02409504
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  • 4
    Electronic Resource
    Electronic Resource
    The Prevalence of halo volumes in familial vitamin D-resistant rickets (1971)
    Springer
    Calcified tissue international 7 (1971), S. 76-80 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02062595
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  • 5
    Electronic Resource
    Electronic Resource
    Formation and structure of Ca-deficient hydroxyapatite (1981)
    Springer
    Calcified tissue international 33 (1981), S. 111-117 
    Details
    ISSN: 1432-0827
    Keywords: Calcium-deficient hydroxyapatite ; Amorphous calcium phosphate ; Bone ; Radial distribution function ; Carbonate apatite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary When amorphous calcium phosphate (ACP) was transformed to crystalline hydroxyapatite (HA) in a series of aqueous slurry concentrations ranging from low to high, the higher slurry concentrations produced more Ca-deficient HA as measured by Ca/P ratio and heat-produced pyrophosphate. We feel that the excess solution phosphate produced in the higher slurry transformations results in lower Ca/P ratio HA. It has been suggested that an ACP is the precursor to bone apatite. Regulation of the in vivo ACP slurry concentration could then control the stoichiometry and, therefore, the metabolic activity of bone apatite. X-ray radial distribution function (RDF) analyses showed that CO 3 2− substitution in HA creates far greater structural distortions than do Ca deficiencies. The latter, however, do produce small, but observable, structural distortions when compared to stoichiometric HA. It now seems clear that the RDF of bone apatite can be modeled by a synthetic, Ca-deficient, CO 3 2− -containing HA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02409422
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  • 6
    Electronic Resource
    Electronic Resource
    Purification, composition, and31P NMR spectroscopic properties of a noncollagenous phosphoprotein isolated from chicken bone matrix (1981)
    Springer
    Calcified tissue international 33 (1981), S. 385-394 
    Details
    ISSN: 1432-0827
    Keywords: Phosphoprotein ; Bone ; 31P-NMR ; Phosphoserine ; Phosphothreonine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Fractionation of the EDTA-soluble, noncollagenous proteins of the organic matrix of chicken bone by Sephadex G-100 molecular sieving has revealed that the majority of the organic phosphorus is present in two fractions, from one of which a homogeneous phosphoprotein has been isolated. The purified phosphoprotein has an apparent molecular weight of 12,000 and contains bothO-phosphoserine andO-phosphothreonine.31P-NMR spectroscopy demonstrates that all of the organic phosphorus exists in the form of phosphomonoesters which have an average pK2 of 6.8. The phosphoprotein is highly acidic due to its high content of dicarboxylic acids in addition to the presence of organic phosphorus. The characteristic amino acid composition of the phosphoprotein establishes its noncollagenous nature and highlights the differences among bone, dentin, and enamel phosphoproteins. The absence ofγ-carboxyglutamic acid distinguishes it from osteocalcin, the noncollagenousγ-carboxyglutamic acid-containing peptide of bone matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02409461
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  • 7
    Electronic Resource
    Electronic Resource
    Osteopenia in juvenile diabetes (1981)
    Springer
    Calcified tissue international 33 (1981), S. 455-457 
    Details
    ISSN: 1432-0827
    Keywords: Bone ; Osteoporosis ; Diabetes mellitus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The bone mineral status of fifty-one children with diabetes mellitus was studied by single photon absorptiometry. The mean bone mineral content was 13% below values predicted by age, sex, height, and weight. Those children whose diabetes was one year or less in duration were as osteopenic as those whose diabetes was of longer duration. The demineralized children received a higher daily insulin dose than the others. No association was noted between the degree of skeletal demineralization and sex, statural growth, renal function, and serum calcium and phosphorus. No significant changes in bone mineral content were noted longitudinally.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02409473
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  • 8
    Electronic Resource
    Electronic Resource
    Ageing patterns of trabecular and cortical bone and their relationship (1971)
    Springer
    Calcified tissue international 7 (1971), S. 23-30 
    Details
    ISSN: 1432-0827
    Keywords: Ageing ; Cancellous ; Cortical ; Bone ; Osteoporosin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé La masse de l'os spongieux de 129 cadavres des deux sexes a été déterminée. Dans 77 cas, la masse de l'os cortical est également mesurée. La masse de l'os spongieux d'os de la crête iliaque est établie à l'aide d'une méthode physique, basée sur le principe d'Archimède. La masse de l'os cortical est mesurée au niveau du second métacarpe de la main droite à l'aide d'une méthode graphimétrique aux rayons X. La masse de l'os spongieux et cortical décroit significativement avec l'âge chez la femme, mais non chez l'homme. Une corrélation significative a pu être établie chez la femme entre la masse de l'os cortical et spongieux.
    Abstract: Zusammenfassung Die trabeculäre Knochenmasse von 129 Leichen beiden Geschlechts wurde gemessen. In 77 Fällen wurde auch die corticale Knochenmasse gemessen. Die trabeculäre Knochenmasse von Beckenkammproben wurde mit einer physikalischen Methode bestimmt, welche auf dem Prinzip des Archimedes basiert. Die corticale Knochenmasse wurde am zweiten Metacarpus der rechten Hand mittels einer graphimetrischen Röntgenmethode gemessen. Die trabeculäre und die corticale Knochenmasse nahm bei Frauen, aber nicht bei Männern, mit zunehmendem Alter stark ab. Bei Frauen wurde eine signifikante Korrelation zwischen corticaler und trabeculärer Knochenmasse festgestellt.
    Notes: Abstract Trabecular bone mass was measured in the iliac crest of 129 cadavera of both sexes with a physical method based on the principle of Archimedes. Cortical bone mass was measured at the second metacarpal of the right hand with a graphimetric X-ray method in 77 cases. Trabecular and cortical bone mass decreased significantly with age in women but not in men. A significant correlation between cortical and trabecular bone mass was established in women.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02062590
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  • 9
    Electronic Resource
    Electronic Resource
    Application of the electron spin resonance technique for quantitative evaluation of the resorption rate of irradiated bone grafts (1971)
    Springer
    Calcified tissue international 7 (1971), S. 58-66 
    Details
    ISSN: 1432-0827
    Keywords: Electron spin resonance ; Resorption ; Irradiation ; Bone ; Graft
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé La technique de la résonance aux électrons (ESR) a été utilisée pour étudier la résorption et la substitution progressive de greffons osseux stérilisés par irradiation (à une dose de 3.3 Mrads) chez le lapin et le chien. Le signal stable d'ESR, émis par la perte de substance structurale induite par le rayonnement au niveau du minéral osseux, est utilisé comme marqueur biologique. La concentration de résonance et le nombre total des centres paramagnétiques sont mesurés avant et après greffe. Ue décroissance progressive de la concentration de résonance et du nombre total des centres paramagnétiques est observée après des intervalles de temps variables, faisant suite à l'implantation. En considérant la stabilité inhabituelle et le manque de réactivité chimique des centres paramagnétiques intéressés, il apparait que la décroissance des intensités du signal ESR observé indique une résorption et une substitution progressive. Cette méthode parait intéressante pour des recherches sur les tissues calcifiés.
    Abstract: Zusammenfassung Zur Erforschung der Resorption und der schleichenden Substitution von radiosterilisierten (Dosis: 3,3 Mrad) Knochentransplantaten bei Kaninchen und Hunden wurde die Technik der elektronischen Drehresonanz (ESR) angewendet. Als biologische Markierung diente das stabile ESR-Signal, welches aufgrund des bestrahlungsbedingten Strukturdefektes im Knochenmineral entsteht. Die Drehkonzentration und die Gesamtzahl der paramagnetischen Zentren wurden vor und nach dem Transplantieren gemessen. In verschiedenen Zeitintervallen konnte nach der Implantierung eine allmähliche Abnahme der Drehkonzentration sowie der Gesamtzahl der paramagnetischen Zentren beobachtet werden. Aus der ungewöhnlichen Stabilität und der fehlenden chemischen Reaktionsfähigkeit der beteiligten paramagnetischen Zentren wird geschlossen, daß die beobachtete abnehmende ESR-Signalintensität ei Zeichen für die zunehmende Resorption und Substitution ist. Es scheint, daß mit der besprochenen Technik eine brauchbare Methode zur Erforschung von mineralisiertem Gewebe zur Verfügung steht.
    Notes: Abstract The electron spin resonance (ESR) technique has been applied to the investigation of the resorption and creeping substitution of radiosterilized (3.3 Mrads dose) bone grafts in rabbits and dogs. The stable ESR signal arising from the radiation-induced structural defect in bone mineral was used as a biological label. the spin concentration and the total number of paramagnetic centres were measured before and after grafting. The gradual decrement of spin concentration as well as that of total number of paramagnetic centres were observed at varioust ime intervals after implantation. On the basis of the unusual stability and lack of chemical reaction of the paramagnetic centres involved, it is concluded that the decrease of the observed ESR signal intensities indicates progressive resorption and substitution. it seems that the proposed method can be useful for research o mineralized tissues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02062593
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  • 10
    Electronic Resource
    Electronic Resource
    Albumin-induced resoprtion of fetal rat bonein vitro (1971)
    Springer
    Calcified tissue international 7 (1971), S. 67-75 
    Details
    ISSN: 1432-0827
    Keywords: Bone ; Resorption ; Ablumin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Certains sérums albumines provoquent une résorption d'os vivatin vitro. Cet effet de l'albumine est en rapport avec la concentration du produit. L'albumine dialysée et l'albumine chauffée à 55° conserve totalement son activité de résorption osseuse: l'albumine dénaturée par la chaleur est inactive. L'action de l'albumine est inhibée par l'élévation du pH. Il n'y a pas de rapport entre l'activité de résorption osseuse et la propriété de combinaison des albumines aux ions calciques ou leur propriété de libérer des ions d'hydrogène. La thyrocalcitonine, le glucago, les glucocorticoides et l'actinomycine D Inhibent la résorption osseuse induite par l'albumine.
    Abstract: Zusammenfassung Einige Serunmalbumine verursachen die Resorption von lebenden Knochenin vitro. Diese Wirkung des Albumins ist konzentrationsabhängig. Dialysiertes und auf 55° erhitztes Albumin behalten ihre volle knochenresorbierende Aktivität; hitzedenaturiertes Albumin ist inaktiv. Der Albumineffekt wird durch erhöhtes pH gehemmt. es besteht keine Korrelation zwischen der knochenauflösenden Aktivität und der Fähgkeit des Albumins, Ca-lonen zu binden oder H-Ionen abzugeben. Thyrocalcitoni, Glucagon, Glucocorticoide und Antinomycin D wirken als Antagonisten der durch Albumin verursachten Kochenresorption.
    Notes: Abstract Some serum albumins cause resorption of living bonein vitro. This effect of albumin is concentration-dependent. Dialyzed albumin and albumin heated at 55° retain full bone resorbing activity; heat denatured albumin is inactive. The albumin effect is inhibited by elevated pH. No correlation exists between bone resorbing activity and the capacity of albumins to bind calcium ions or to donate hydrogen ions. Thyrocalcitonin, glucagon, glucocorticoids and actinomycin D antagonize albumin-induced bone resorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02062594
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