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  • 1
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 54 (1982), S. 1336-1339 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 55 (1983), S. 488-492 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 55 (1983), S. 2175-2179 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 55 (1983), S. 1817-1819 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 55 (1983), S. 2444-2445 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Résumé Dans les pyroclastites de l'Eocène supérieur de la région de Qom-Aran (Iran Central) existent des roches à aspect intermédiaire entre des laves et des roches pyroclastiques (laves bréchiques). Ces laves hétérogénes présentent deux composants originaux: l'un acide formant la matrice claire (rhyolite à structure fluidale), l'autre basique, sombre, vitreux, en forme de micropillows et/ou de flammes. L'étude détaillée des contacts entre ces deux composants, illustrée par une série de microphotographies, implique l'état liquide des deux composants lors de leur mélange. L'homogénéisation mécanique aboutit à des laves intermédiaires (dacitoïdes). Durant ce dernier processus, des phénomènes de diffusion entre les deux magmas contrastés provoquent certains changements chimiques dans la composition originelle de chacun des deux composants.
    Notes: Abstract Petrographic Observations on Mixing of Acid and Basic Magmas: Genesis of the Dacitoïdes of the Qom-Aran Area (Central Iran) Among the Upper Eocene pyroclastic materials of the Qom-Aran area (Central Iran) there are rocks (named lava-breccias) with intermediate facies between lavas and pyroclastic rocks. These heterogeneous lavas exhibit two distinct components: (1) an acid one, making up the light-coloured groundmass (fluidal rhyolite), and (2) a basic, dark, vitreous component in the shape of micro-pillows and/or flame-like patches. A detailed study of the boundaries between these two components has been performed and illustrated by several microphotographs. It shows that the two components were in a liquid state when mixed with each other. Mechanical homogeneization results into an intermediate lava (dacitoïde). During this process, diffusion phenomena between the two contrasted magmas brought about chemical changes in the original composition of each — basic and acid — component.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Probability theory and related fields 55 (1981), S. 109-117 
    ISSN: 1432-2064
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary LetX 1,X 2,⋯ be a sequence of independent and identically distributed random variables withEX 1=0 andEX 1 2 =1. It is shown that for allnℕ∈ and allt∈ℝ, $$\left| {P\left( {n^{ - 1/2} \sum\limits_{i = 1}^n {X_i〈 t} } \right) - \Phi (t)} \right| \leqq c_{\text{1}} n^{ - 1/2} E|X_1 |^3 (1 + |t|^3 )^{ - 1}$$ wherec 1≦c 0+8(1+e) (c 0 being the constant in the Berry-Esséen Theorem.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Parasitology research 69 (1983), S. 395-396 
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary For the first time three strains of the newly described species of pathogenic Naegleria,N. australiensis De Jonckheere 1981 were isolated from a thermally polluted canal in Western Germany. They were pathogenic for mice with a lower mortality and a longer incubation period compared to mice infected withN. fowleri (Carter 1970). By the immunofluorescence-method these strains could be identified asN. australiensis.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-1955
    Keywords: Trypanosoma brucei ; Cryopreservation ; Fine structure ; Infectivity ; Motility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die während der Tiefgefrierkonservierung vonTrypanosoma brucei mit Zusatz von 10% Glyzerin auftretenden feinstrukturellen Veränderungen wurden zu Beeinträchtigungen ihrer Motilität und Infektiosität in Beziehung gesetzt. Als Kontrollen wurden 1. Parasiten aus Frischblut infizierter Mäuse, 2. in PSG-3-Puffer erythrocytenfrei suspendierte Trypanosomen unmittelbar nach Passage durch DE-Zellulose, 3. nach 71 min Aufenthalt bei 4°C in PSG-Puffer mit Zusatz von 10% Glyzerin untersucht. Die Trypanosomen aus Frischblut zeigten bei optimaler Strukturerhaltung volle Motilität und Infektiosität. Bei etwa 50% der tiefgefrorenen Trypanosomen wurden morphologische Veränderungen festgestellt: Bildung bis 1 μm großer myelinartiger Figuren im Kinetoplast, in den Mitochondrien und im Cytoplasma. Spaltbildungen im Cytoplasma, die zur Bildung großer Vakuolen und zum Abtrennen des Cytoplasmas von der Pellicula führen, Verlust der Ribosomen, ballonartiges Aufblähen der Geißeltasche und Entstehung von mikrokristallinen Strukturen in den peroxisomenähnlichen Organellen (po-bodies). Veränderungen am Kern traten erst spät nach fortgeschrittenen Schädigungen im Cytoplasma, die zur Lyse führen, ein. Mit den morphologischen Veränderungen einhergehend wurde ein erheblicher Motilitäts- und Infektiositätsverlust beobachtet. Die Mehrzahl der Schäden wurde bereits bei den nicht tiefgefrorenen Blutflagellaten mit Glyzerinzusatz beobachtet. Anhand der Befunde dieses Kontrollansatzes wurde deutlich, daß die Ausbildung mikrokristalliner Strukturen in den peroxisomenähnlichen Organellen und der Verlust der Ribosomen allein als spezifische auf die Tiefgefrierung zurückzuführende Veränderungen anzusehen sind. Auch die Infektiosität war bereits im gleichen Maße in der Glyzerinkontrolle beeinträchtigt, während die Motilität noch relativ gut erhalten blieb. Obwohl bei den Trypanosomen beider PSG-3-Kontrollen nach Passage durch die Lanham-Säule geringfügige feinstrukturelle Veränderungen, wie z.B. Spaltbildungen, sichtbar wurden, konnte keine nennenswerte Beeinträchtigung ihrer Motilität und Infektiosität festgestellt werden, besonders nicht unmittelbar nach Säulendurchlauf.
    Notes: Abstract The ultrastructural changes occurring during deep-freeze storage ofTrypanosoma brucei after 10% glycerin had been added were compared with respect to the impairment of their motility and their infectivity. The following served as controls: (1) parasites from fresh blood taken from infected mice, (2)Trypanosoma suspended erythrocyte-free in PSG-buffer immediately after passage through DE cellulose, and (3)Trypanosoma after 71 min at 4°C in PSG-buffer with 10% glycerin. TheTrypanosoma from fresh blood exhibited, under optimum structural maintenance, complete motility and infectivity. The following morphologic changes were found in approximately 50% of the deep-frozenTrypanosoma: the formation of myelin-like figures of up to 1 μm in size in the kinetoplast, in the mitochondria, and in the cytoplasm; fissurations in the cytoplasm leading to development of large vacuoles and to the separation of the cytoplasm from the pellicle; dissipation of ribosomes; balloon-like inflation of the flagellar pocket; and the appearance of microcrystalline structures in the peroxisome-like organelles (po-bodies). Changes in the nucleus did not occur until the cytoplasm had suffered considerable damage which resulted in lysis. A significant loss in motility and infectivity was observed to go hand in hand with the morphologic changes. Much damage was also observed in the hemoflagellates which had not been deep-frozen and to which glycerin had been added. The findings from this control material clearly showed that only the formation of microcrystalline structures in the peroxisome-like organelles and the dissipation of the ribosomes can be regarded as specific changes attributable to the deepfreezing. The infectivity of the glycerin control was also impaired to the same degree, whereas the motility was relatively well maintained. Although slight microstructural changes as, for example, fissurations were evident in theTrypanosoma from both PSG-controls after their passage through the Lanham column, no significant impairment of their motility or infectivity could be detected, particularly not directly after their passage through the column.
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