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  • 1
    Electronic Resource
    Electronic Resource
    Bioactive Glasses, Aluminum Oxide, and Titanium (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 523 (1988), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1988.tb38518.x
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  • 2
    Electronic Resource
    Electronic Resource
    Surface Activities of Bioactive Glass, Aluminum Oxide, and Titanium in a Living Environment (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 523 (1988), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1988.tb38514.x
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  • 3
    Electronic Resource
    Electronic Resource
    Optische Erscheinungen im thermodynamisch kritischen Gebiet Beobachtung und Deutung der Vorgänge in einem Thermosyphon (1987)
    Springer
    Heat and mass transfer 21 (1987), S. 155-162 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Kritisch gefüllte Thermosyphons für den Wärmetransport unterscheiden sich von kritisch gefüllten Testzellen für Stoffwertuntersuchungen durch größere Ausdehnung und aufgeprägtes Temperaturgefälle. Die thermodynamischen Zustände im Fluid des Thermosyphons sind damit wesentlich heterogener. In einem gläsernen Thermosyphon ließen sich Strömungen und Phasenverteilungen beobachten. Das bekannte Zusammenbrechen des Wärmetransportmechanismus zeigte sich als Folge des Überflutens der Kühlzone durch Flüssigkeit. Der Einfluß von Heizleistung, Druck und Füllmenge auf die Verteilung der Phasen, das Auftreten von Pulsationen und die Auswirkung eines Heizimpulses nahe dem kritischen Zustand wurden beobachtet und mit Hilfe des Dichte/Druck-Diagramms erklärt.
    Notes: Abstract Critically filled thermosyphons for heat transport differ in size and temperature distribution from critically filled testcells for property research. Consequently, the thermodynamic states within a thermosyphon are distributed more heterogeneously. In a glass thermosyphon, flows and phase distributions were observed. A break-down of the heat transport mechanism was found as a consequence of flooding of the cooling region by liquid. Observed and explained - by use of a density/pressure diagram - were the effects of heating, of pressure and of fluid quantity on the distribution of the phases, the appearance of pulsations and the propagation of a heat pulse near the critical state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01377572
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  • 4
    Electronic Resource
    Electronic Resource
    Erythropoietic and hepatic porphyrias (2000)
    Springer
    Journal of inherited metabolic disease 23 (2000), S. 641-661 
    Details
    ISSN: 1573-2665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Porphyrias are divided into erythropoietic and hepatic manifestations. Erythropoietic porphyrias are characterized by cutaneous symptoms and appear in early childhood. Erythropoietic protoporphyria is complicated by cholestatic liver cirrhosis and progressive hepatic failure in 10% of patients. Acute hepatic porphyrias (δ-aminolaevulinic acid dehydratase deficiency porphyria, acute intermittent porphyria, hereditary coproporphyria and variegate porphyria) are characterized by variable extrahepatic gastrointestinal, neurological–psychiatric and cardiovascular manifestations requiring early diagnosis to avoid life-threatening complications. Acute hepatic porphyrias are pharmacogenetic and molecular regulatory diseases (without porphyrin accumulation) mainly induced by drugs, sex hormones, fasting or alcohol. The disease process depends on the derepression of hepatic δ-aminolaevulinic acid synthase following haem depletion. In contrast to the acute porphyrias, nonacute, chronic hepatic porphyrias such as porphyria cutanea tarda are porphyrin accumulation disorders leading to cutaneous symptoms associated with liver disease, especially caused by alcohol or viral hepatitis. Alcohol, oestrogens, haemodialysis, hepatitis C and AIDS are triggering factors. Porphyria cutanea tarda is the most common porphyria, followed by acute intermittent porphyria and erythropoietic protoporphyria. The molecular genetics of the porphyrias is very heterogenous. Nearly every family has its own mutation. The mutations identified account for the corresponding enzymatic deficiencies, which may remain clinically silent throughout life. Thus, the recognition of the overt disorder with extrahepatic manifestations depends on the demonstration of biochemical abnormalities due to these primary defects and compensatory hepatic overexpression of hepatic δ-aminolaevulinic acid synthase in the acute porphyrias. Consequently, haem precursors are synthesized in excess. The increased metabolites upstream of the enzymatic defect are excreted into urine and faeces. The diagnosis is based on their evaluation. Primary enzymatic or molecular analyses are noncontributary and may be misleading. Acute polysymptomatic exacerbations accompany a high excretory constellation of porphyrin precursors δ-aminolaevulinic acid and porphobilinogen. Homozygous or compound heterozygous variants of acute hepatic porphyrias may already manifest in childhood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005645624262
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  • 5
    Electronic Resource
    Electronic Resource
    Primary mineralization and extracellular matrix vesicles in rat bone after administration of glass-ceramic implants (1981)
    Springer
    Archives of orthopaedic and trauma surgery 98 (1981), S. 237-240 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Glaskeramikimplantate wurden in passende Bohrlöcher des Rattenfemurschafts eingesetzt. Die elektronenmikroskopische Untersuchung ergab die Bildung einer kollagenreichen Matrix an der Grenze zwischen Implantat und Knochen. Typische Erscheinungen der primären Mineralisation und der Resorption von Implantat und Knochen wurden an der Implantat-Knochengrenze festgestellt. Die primäre Mineralisation war gekennzeichnet durch aktive knochenbildende Zellen, extrazelluläre Matrixvesikel und kalzifizierende globuläre Strukturen. Die intensive primare Mineralisation in der Umgebung der Implantate spricht dafür, daß die Glaskeramik die Verknöcherung fördern und eine günstige Beziehung zwischen Gewebe und Implantat zustande kommen kann.
    Notes: Summary Glass-ceramic implants were administered into cavities prepared in rat femoral shaft. Electron microscope examination revealed formation of collagenous rich matrix in the implant-bone interface. Features typical to primary mineralization as well as bone and implant resorption were present in the interface. Primary mineralization was characterized by the occurrence of active forming cells, extracellular matrix vesicles and calcifying calcospheritic structures. Intensive primary mineralization in association with the implants indicates that glass-ceramic may be stimulative to ossification, allowing favourable tissue-implant relationship.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00632982
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  • 6
    Electronic Resource
    Electronic Resource
    The thermal conductivity of R115 in the critical region (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 687-700 
    Details
    ISSN: 1572-9567
    Keywords: critical point ; enhancement ; fluorochlorohydrocarbons ; hotwire method ; refrigerant R115 ; thermal conductivity ; transient method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By means of the transient hot-wire method, the thermal conductivity of refrigerant R115 was measured over a wide region around the thermodynamic critical point. The enhancement of thermal conductivity was clearly observed at states close to the critical point. The thermal conductivity obtained for saturated liquid was compared to data by other authors with satisfactory agreement. For the thermal conductivity including the critical enhancement, equations are given according to the suggestion by J. V. Sengers. Comparison with measured data shows systematic deviations, with theoretical values being larger except for temperatures very close to the critical and densities above the critical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00507989
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  • 7
    Electronic Resource
    Electronic Resource
    Group separation of alkyl-substituted aromatic hydrocarbons by high-performance liquid chromatography using perfluorocarbon modified silica gel (1982)
    Springer
    Chromatographia 16 (1982), S. 178-182 
    Details
    ISSN: 1612-1112
    Keywords: HPLC ; Group separation ; Perfluorocarbon modified silica gel ; Alkyl-substituted aromatic hydrocarbons ; Intermolecular forces ; π-electron energy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The behaviour of perfluorocarbon modified silica gel has been investigated in HPLC for the group separation of alkyl-substituted aromatic hydrocarbons. Using dry alkanes as eluents, the influence of the substituted alkyl groups on the retention of mono- and polycyclic aromatics is very small. Therefore, aromatic hydrocarbons can be separated in order of their increasing π-electron energy characterized by a linear correlation between ink′ and the resonance energy. The method is useful for the group separation of crude oil distillates into groups according to aromatic ring types.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02258894
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  • 8
    Electronic Resource
    Electronic Resource
    The anchoring of glass ceramics of different solubility in the femur of the rat (1980)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 14 (1980), S. 607-618 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A direct physicochemical bond between alkali-rich bioglass or glass ceramic (45 S 5 A and B, Hench) or alkali-poor glass ceramic (KG S, Brömer) and bone has been well documented. Since long-term studies have revealed the interface to be subjected to remodeling of the bone and to increased focal disintegration of the implant, glass ceramics of reduced solubility have been developed by lowering the Na2O content and adding Al2O3, Ta2O5, TiO2, and Sb2O3. Implants of glass ceramic KG S and different compositions with reduced solubility have been studied histologically 14, 29, or 30, 60, 119, and 245 days after implantation in the femur of male Sprague-Dawley rats. Implants of KG S are anchored at an interface with bone connection, which is known to provide for application of considerable shear and tensile strengths; whereas, at the interface of ceramics of reduced solubility, soft tissue, chondroid and osteoid are mainly observed. The dynamics of the events at the interface indicate a disturbance of the transformation of chondroid cells into osteoblasts and of the mineralization of osteold. This disturbance of pathophysiologic processes during bone healing or bone regeneration is discussed.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820140507
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  • 9
    Electronic Resource
    Electronic Resource
    The ultrastructure of the interface between a glass ceramic and bone (1981)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 15 (1981), S. 291-305 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The interface of alkali-poor glass ceramic implanted in femora of male Sprague-Dawley rats shows soft tissue, chondroid, osteoid, and bone in connection with the implant. The ultrastructure of the interface with soft tissue mainly exhibits a corrosion process, during which the dissolution of the crystalline phase of the glass ceramic precedes the dissolution of the glassy phase. Macrophages are involved in this process phagocytosing debris of the glassy phase and removing as well as dissolving the remainders of the glass ceramic. Under circumstances not yet fully understood, the corrosion stops, and ground substance like material is deposited, which can be, at least partially, mineralized. After the disappearance of macrophages, chondroblasts, and/or osteoblasts lay down collagen fibrils and ground substance in which matrix vesicles are discernible, representing initial foci of mineralization. Areas with bone connection display collagen fibers and deposits of apatite crystals in close relationship to the bulk glass ceramic as well as small particles mainly derived from the glassy phase of the implant, providing the micromorphological substrate for the shearing and tensile strength of the interface between glass ceramic and bone.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820150302
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  • 10
    Electronic Resource
    Electronic Resource
    Preface: “Symposium on implant-stimulated interface reactions,” Klinikum Steglitz, free university of Berlin, February 18 and 19, 1983 (1985)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 19 (1985), S. 197-198 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820190303
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