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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillan Magazines Ltd.
    Nature 391 (1998), S. 54-56 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Massive black holes are generally thought to exist at the centres of galaxies, but an unambiguous identification of a black hole has been impeded by a lack of evidence for the strong-field relativistic effects expected in the vicinity of such an object. Several years ago, a very broad iron ...
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 9 (1972), S. 272-282 
    ISSN: 1432-0827
    Keywords: Bone ; Resorption ; Lipopolysaccharide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé 1. Des lipopolysaccharides hautement purifiés stimulent la résorption de l'os en culture de tissus, par examen morphologique et par libération de45Ca d'os prémarqués. De plus, on note une augmentation en a) lactate libéré dans le milieu de culture, b) nombre total de cellules des os c) nombre d'ostéoclastes et d) diminution de la matrice osseuse. 2. Les lipopolysaccharides préparés par extraction au phénol ou extraction par ether stimule la résorption osseuse. 3. Les lipopolysaccharides, dont la majorité des lipides est éliminée, perdent leur propriété de stimuler la résorption osseuse. 4. Il n'y a aucun rapport entre la propriété de stimulation de résorption osseuse des lipopolysaccharides et la pyrogénicité ou leur possibilité de neutraliser des anticorps. 5. L'effet d'une dose sub-maximale d'hormone parathyroidienne sur la résorption osseuse s'ajoute à celle des lipopolysaccharides. 6. L'héparine, qui n'a aucune action sur la résorption osseuse, régularise l'action du lipopolysaccharide. 7. La thyrocalcitonine inhibe de la même façon la résorption, stimulée par le lipopolysaccharide et l'hormone parathyroidienne.
    Abstract: Zusammenfassung 1. In der Gewebekultur stimulieren hochgereinigte Lipopolysaccharide die Knochenresorption, welche morphologisch oder anhand des freigesetzten45Ca aus vormarkierten Knochen bestimmt wird. Folgende Zunahmen sind mit diesem Effekt verbunden: a) Freisetzung von Laktat ins Kulturmedium; b) die Gesamtzahl der Zellen in den Knochen; c) das Vorkommen von Osteoklasten und d) eine Abnahme der Menge von Knochenmatrix. 2. Lipopolysaccharide, die entweder durch Phenol- oder Ätherextraktion gewonnen wurden, stimulieren die Knochenresorption. 3. Werden den Lipopolysacchariden die meisten Lipide entzogen, so verlieren sie ihre Eigenschaft, die Knochenresorption anzuregen. 4. Die Fähigkeit der Lipopolysaccharide, die Knochenresorption zu stimulieren und die pyrogenen Eigenschaften oder die Möglichkeit, Antikörper zu neutralisieren, gehen nicht parallel. 5. Wird eine submaximale Dosis von Parathormon verwendet, so addiert sich dessen Effekt auf die Knochenresorption zu jenem der Lipopolysaccharide. 6. Heparin, welches an sich keine Wirkung auf die Knochenresorption hat, potenziert den Lipopolysaccharideffekt. 7. Thyrocalcitonin hemmt in ähnlichem Maße die durch Lipopolysaccharide und Parathormonstimulierte Knochenresorption.
    Notes: Abstract 1. Highly purified lipopolysaccharides stimulate the resorption of bone in tissue culture as assayed morphologically and by the release of45Ca from prelabelled bones. Associated with this effect are increases in: a) lactate released into the cultured medium, b) the total number of cells in the bones, c) the occurrence of osteoclasts and, d) a decrease in the amount of bone matrix. 2. Lipopolysaccharides prepared either by phenol extraction or by ether extraction stimulate bone resorption. 3. Lipopolysaccharide with most of the lipid removed loses its ability to stimulate bone resorption. 4. There is no relationship between the ability of lipopolysaccharides to stimulate the resorption of bone and pyrogenicity or their ability to neutralize antibody. 5. When using a submaximal dose of parathyroid hormone, its effect on bone resorption is additive to that of lipopolysaccharides. 6. Heparin which by itself has no effect on bone resorption potentiates the effect of lipopolysaccharide. 7. Thyrocalcitonin inhibits to a similar degree the resorption stimulated by lipopolysaccharide and parathyroid hormone.
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 313 (1985), S. 68-70 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Subgenomic RNA4 of BMV serves as the coat protein mRNA8. Its entire sequence is present at the 3' end of dicistronic genomic RNA3, from which it is generated9. Minus-stranded copies of both of these RNAs can be synthesized by the template-dependent BMV RNA-specific replicase extract5,7. However, ...
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 278-278 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The random heap liquid structure has recently been used by Chadwick2 in a hard sphere model of solidification leading to an explanation of the anisotropic nature of crystal growth. It is the purpose of this communication to show that the reliability of the random heap concept of liquid structure ...
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 18 (1973), S. 117-122 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Eine cytogenetische Analyse der ersten und zweiten meiotischen Teilungen von Oocyten von M. mulatta und M. nemestrina wurde nach Reifung in vitro durchgeführt. 76 Diakinese/Metaphase I-Zellen von M. mulatta, die nach einer Kulturzeit von 19–30 Std gewonnen wurden, ergaben eine durchschnittliche Chiasmahäufigkeit von 1,58/Bivalent; von 119 Zellen der Metaphase II zeigten 21 Chromosomenpaare, während eine Zelle 22 Chromosomenpaare aufwies. 51 Oocyten von M. nemestrina zeigten nach einer Kulturzeit von 24 bis 31 Std Diakinese/Metaphase I-Konfigurationen mit einer durchschnittlichen Chiasmafrequenz von 1,52. 54 Metaphase II-Zellen waren normal. In beiden Species war die Zeitkurve der Metaphase II zweigipfelig.
    Notes: Summary Cytogenetic analysis of first and second metaphase configurations of oocytes from M. mulatta and M. nemestrina matured in vitro were carried out. 76 diakinesis/metaphase I cells from M. mulatta obtained after 19–30 hrs of culture revealed an average chiasmata frequency per bivalent of 1.58 and 119 second metaphase cells all contained 21 pairs save for one cell with 22.51 oocytes from M. nemestrina cultured for 24–31 hrs revealed diakinesis/first metaphase configurations with an average chiasmata frequency of 1.52. 54 second metaphase cells were normal. Two peaks of timing for second metaphase were observed in both species.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 253 (1975), S. 183-184 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , 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
    Springer
    Fresenius' Zeitschrift für analytische Chemie 1 (1862), S. 353-357 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 4 (1865), S. 459-467 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 2 (1863), S. 201-212 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 50 (1850), S. 413-415 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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