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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 4 (1969), S. 60-68 
    ISSN: 1432-0827
    Keywords: Calcium phosphate ; Osteocyte ; Electron microscope ; Electron probe ; Osteolysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Nous avons administé 0,6 mg de Dihydrotachystérol à des rats, à raison de 2×0,1 mg par semaine. Les observations suivantes on été faites au moyen du microscope électronique et du radioanalyseur à microsonde électronique. 1. La gaine mucopolysaccharidique péri-ostéocytaire est nettement élargie ches les animaux traités; elle contient un matériel de haute densité électronique constitué de fines particules arrondies ou allongées, variables quant à la quantité et la répartition; 2. La microanalyse met en évidence, dans la gaine péri-ostéocytaire, das quantités considérables de calcium et de phosphore. Le rapport Ca/P peut atteindre celui de l'apatite pure. Nous considérons les particules dérites comme des germes de nucléation de phosphate de calcium. Nous pensons que par suite d'une augmentation pathologique du métabolisme calcique, des sels calciques sont libérés à partir de la substance minéralisée entourant la lacune ostéocytaire, en quantités telles qu'ils deviennent morphologiquement apparents dans la gaine péricellulaire.
    Abstract: Zusammenfassung Ratten wurden mit 0,6 mg Dihydrotachysterin (0,1 mg zweimal wöchentlich) behandelt. Dabei wurden mit Hilfe des Elektronenmikroskops und der elektronenmikroskopischen Elektronentrahl-Mikroanalyse folgende Befunde erhoben: 1. Bei den behandelten Tieren war die periosteocytäre Mucopolysaccharidscheide deutlich verbreitert. Sie enthielt, in wechselnder Menge und Verteilung, kleine rundliche oder nadelförmige, elektronendichte Partikel. 2. Mit der elektronenmikroskopischen Elektronentrahl-Mikroanalyse konnten in der Zell-scheide große Mengen von Calcium und Phosphor nachgewiesen werden. Das Verhältnis Ca/P kann die Werte reinen Apatits erreichen. Wir halten die elektronendichten Partikel für Calciumphosphat-Keime. Im Rahmen eines pathologisch gesteigerten Calciumstoffwechsels werden Calciumsalze in solchen Mengen aus der die Osteocytenhöhle umgebenden mineralisierten Grundsubstanz freigesetzt, daß sie morphologisch nachweisbar werden.
    Notes: Abstract Rats were treated with 0.6 mg (0.1 mg twice a week) of dihydrotachysterol and the following electron microscopic and electron-probe X-ray microanalytical findings were made: 1. The periosteocytic mucopolysaccharide sheath is definitely enlarged in the treated animals. In it were found, in variable quantities and distribution, collections of round or needle-shaped electron-dense particles. 2. By electron-probe X-ray microanalysis, high concentrations of calcium and phosphorus were detected in the cell sheath, where the Ca/P ratio may reach the value of pure apatite. The electron-dense particles are considered to be calcium phosphate nuclei. It is postulated that in consequence of the pathologically increased calcium turnover, calcium salts are set free from the mineralized matrix surrounding the osteocyte lacuna in such quantities as to become morphologically detectable in the cell sheath.
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  • 2
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 561-570 
    ISSN: 0392-6737
    Keywords: Plasma production and heating by laser beams ; Plasma properties ; Plasma diagnostic techniques and instrumentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Time-resolved images of the rear surface of thin metallic foils irradiated by 5 ns pulses of Nd-glass laser have been recorded within a spectral window from 5800 Å to 6900 Å. By approximating the plasma to a blackbody, the recorded intensities have been converted into temperature giving electron temperature up to 108 K and the results are compared with the predictions of the computer code, MEDUSA.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 307 (1978), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Our technique (see legend to Fig. 1) is a refinement of that reported earlier4: tissue in known physiological condition is quench-frozen at ?180 C, sectioned and transferred to the cold stage of an X-ray microanalyser. By the maintenance of low temperature, the water in the tissue is retained as ...
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  • 6
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To study the distribution of water-soluble ions in biological systems, we have therefore developed a technique for immobilisation of water and solutes by rapid freezing, followed by sectioning and examination of the tissue while still in the frozen, hydrated state, that is with cellular and ...
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of mathematical biology 15 (1953), S. 43-47 
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract This paper deals with the following question: Which distributions of radiosensitivity in a population can lead to an exponential survival curve? The problem is solved exactly, with statistical fluctuations in dose fully accounted for. It is shown that only an exponential distribution of sensitivities can give rise to an exponential survival curve.
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  • 8
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Barley roots fixed with OsO4 containing potassium pyroantimonate showed the presence of several types of electron opaque precipitates in the cells. Thin sections were cut from a region about 1 cm from the root tip and the electron opaque deposits analysed using EMMA-4 with KEVEX Si(Li) energy dispersive analyser. Antimony-containing deposits at the root surface associated with the mucilaginous sheath were found to contain Fe and P, and count ratios suggest constant proportions of these elements in the precipitates. Within the root cells, vacuolar deposits generally contained Os and Sb, but occasional deposits in epidermal cell vacuoles contained some Fe. Fe was also detected in nuclear deposits in endodermal cells. These findings are discussed briefly in relation to the uptake of Fe into plant roots.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 31 (1975), S. 154-157 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé L'analyse par microsonde électronique des cellules musculaires montre de hautes concentrations de calcium dans les noyaux; la concentration peut être modifiée pharmacologiquement ou par «pacemaker» électrique
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 31 (1975), S. 1339-1340 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Mast cells from rat's tongue muscles, fixed with glutaraldehyde only, were examined with an electron microscopic microanalyzer — the EMMA-4. With the preparatory method used, high emissions of a number of elements were obtained in various intracellular spots. The granules of mast cells were found to contain strictly localized high concentrations of sulphur, calcium and zinc.
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