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  • 1985-1989  (6)
  • 1986  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 69 (1986), S. 81-90 
    ISSN: 1432-0533
    Keywords: Creutzfeldt-Jacob disease ; Slow virus infection ; Subacute spongiform encephalopathy ; Ultrastructure ; Synapse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Guinea pigs inoculated with brain homogenate from serially passaged Creutzfeldt-Jakob disease (CJD) were killed biweekly starting at week 2 until terminal illness (about 200 days following inoculation). A mild swelling of postsynaptic dendrites and an increase in the number of glial filaments in astrocytic processes was seen at week 4, followed by increased swelling and lucency of axons and dendrites by week 6 post inoculation (p.i.). Severe undulation and focal interruptions of synaptic membranes were also observed both at weeks 4 and 6. By week 8, one could see cystically dilated cellular processes. These sometimes showed continuity with adjacent swollen processes through focally disrupted plasma membranes, and most likely represent a progressive enlargement of vacuoles through fusion and subsequent addition of adjoining processes. The spongiform changes increased mildly between week 8 and week 10 and remained essentially the same in subsequent weeks. After week 24 there was a sharp increase in both the number and size of vacuoles. At week 24 severe structural alterations were present both in the neurons and astrocytes, and numerous intranuclear inclusions were demonstrated in many neuronal nuclei. This study shows that morphological changes in the brain occur considerably earlier than the clinical manifestations of the disease. In the early phase of the disease, there were significant alterations on the dendrites and synapses.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Immunogenetics 24 (1986), S. 423-427 
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 15 (1986), S. 0 
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Platelet-derived growth factor (PDGF), which is released during the “clotting cascade”, has a mitogenic effect on a variety of mesenchymal cells including those of the periosteum. Cell culture provides a method of studying these effects. In the present study, PDGF was studied for its ability to stimulate quiescent calvarium periosteal cells to enter G1, indicated by new protein synthesis. After addition of platelet poor plasma, these cells later entered S phase, indicated by uptake of 3H-thymidinc. Three hours after PDGF stimulation, there were quantitative increases of at least 18 protein bands as compared to cells left in serum starvation medium. Two of these new protein bands (31K and 45K) required transcription. These data suggest that PDGF in extravasated blood may stimulate appositional bone formation beneath intact periosteum at the site of injury.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 323 (1986), S. 821-826 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A method is presented which facilitates the direct determination of 239Pu in aquatic solution by the (n,f) reaction with reactor neutrons and subsequent gamma spectrometry without chemical elaboration. Trace impurities of water constituent heavy metal elements are simultaneously determined through their (n, γ) reactions. The sensitivity attained by this method is 1.6×10−15 mol/l 239Pu by measuring the fission product pairs 132Te/132I or 140Ba/140La. The trace impurities determined in the range of 10−8∼10−13 mol/l give an insight into the chemical behaviour of Pu in a given water. The natural uranium concentration plays a role to limit the Pu determination on the one hand and to help understanding the chemical behaviour of Pu on the other hand.
    Notes: Zusammenfassung Es wird eine Methode vorgestellt, die die direkte Bestimmung von 239Pu in wäßriger Lösung über die (n,f)-Reaktion mit Reaktorneutronen und mit anschließender gammaspektrometrischer Messung ohne chemische Aufbereitung ermöglicht. Spurenverunreinigungen der im Wasser enthaltenen Schwermetallelemente werden gleichzeitig über ihre (n, γ)-Reaktionen erfaßt. Durch die Messung der Spaltproduktpaare 132Te/132I oder 140Ba/140La wird bei dieser Methode eine Nachweisgrenze von 1,6×10−15 mol/l 239Pu erreicht. Die bestimmten Spurenverunreinigungen im Bereich von 10−8 bis 10−13 mol/l geben einen Einblick in das chemische Verhalten von Pu in einem vorliegenden Wasser. Der natürliche Urangehalt spielt auf der einen Seite eine einschränkende Rolle bei der Pu-Bestimmung, trägt aber auf der anderen Seite zum Verständnis des chemischen Verhaltens von Pu bei.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 323 (1986), S. 818-820 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The autoradiolytic decomposition of Pu(C2O4)2 · 6H2O has been studied by gravimetric as well as spectroscopic methods for compounds of 238Pu and 239Pu. Irrespective of the specific activity, all oxalates investigated are decomposed to PuOCO3 which appears to be a final product and remains stable even after ten years of storage.
    Notes: Zusammenfassung Die autoradiolytische Zersetzung von Pu(C2O4)2 · 6 H2O wurde gravimetrisch sowie mit spektroskopischen Methoden für die Verbindungen von 238Pu und 239Pu untersucht. Unabhängig von der spezifischen Aktivität zersetzen sich alle untersuchten Oxalate zu PuOCO3, welches das Endprodukt darstellt und sogar nach zehn Jahren Lagerung stabil bleibt.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 28 (1986), S. 1838-1844 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A carrier-supported mycelial growth of Penicillium chrysogenum was applied to penicillin fermentation system using celite as a support material. Hyphal growth through the pore matrices of the material showed strong anchorages and provided highly stable biofilm growth. With bioparticles developed in such a manner, both cell growth and penicillin production were observed to increase significantly compared to the conventional dispersed filamentous cultures. Maximum values of specific penicillin production rate were found to be constant regardless of the growth form. A three-phase fluidized-bed fermentor was designed and tested for penicillin production using the bioparticles. Two modes of operation, semicontinuous and repeated fed batch, of the fermentor were tried. It was noted that the overgrowth of free mycelia and the development of fluffy loose bioparticles caused poor mixing and made the fermentor operation quite difficult. Control of the bioparticle size and the extension of production phase were therefore considered important to maintain the reactor productivity at a desired level. From the results of repeated fed-batch operation it was found that the control of bioparticle size could be successfully achieved by phosphate-limiting culture condition. Penicillin production under this condition was also observed to be maintained at a high level (about 80% of the maximum) for at least 1 month.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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