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  • 1
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 289 (1981), S. 572-574 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Figure 1 shows the open-circuit dissolution of the oxalic acid film in 1M sulphuric acid. The electron micrographs show that the pore widening occurs uniformly throughout the film5. Thus, it seems possible to determine the distribution of incorporated impurities across the pore walls by varying the ...
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 350 (1980), S. 0 
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Neurosurgical review 7 (1984), S. 233-252 
    ISSN: 1437-2320
    Schlagwort(e): Clinical application ; imaging techniques ; methodology ; positron emission tomography ; radiochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary One of the most exciting new techniques introduced in the last ten years is positron emission tomography (PET). PET provides quantitative, three-dimensional images for the study of specific biochemical and physiological processes in the human body. This approach is analogous to quantitativein vivo autoradiography but has the added advantage of permitting non-invasivein vivo studies. PET scanning requires a small cyclotron to produce short-lived positron emitting isotopes such as oxygen-15, carbon-11, nitrogen-13 and fluorine-18. Proper radiochemical facilities and advanced computer equipment are also needed. Most important, PET requires a multidisciplinary scientific team of physicists, radiochemists, mathematicians, biochemists and physicians. This review analyses the most recent trends in imaging technology, radiochemistry, methodology, and clinical applications of positron emission tomography.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    International journal of legal medicine 90 (1983), S. 1-6 
    ISSN: 1437-1596
    Schlagwort(e): Drowning, lung water content ; Relative lung weight, drowning ; Ertrinken, Wassergehalt der Lunge ; Relatives Lungengewicht, Ertrinken
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin , Rechtswissenschaft
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Drei Arten von Ertrinkungsflüssigkeiten (Süßwasser, isotonische Kochsalzlösung und hypertonische Kochsalzlösung) wurden angewandt. Nachdem eine Ratte in einen Exsikkator von 17 cm Länge und 14 cm Breite gebracht wurde, wurde das Gefäß mit Flüssigkeit gefüllt. Die Zeitdauer bis zum Todeseintritt von durchschnittlich 2,5 min differierte nicht stark zwischen den drei Gruppen. Die zwei „Kochsalzgruppen” zeigten höhere Werte als die „Wassergruppe”, sowohl was den Wassergehalt der Lunge als auch das Verhältnis Lungengewicht/Körpergewicht (relatives Lungengewicht) betrifft, aber es gab keine signifikante Differenz zwischen beiden „Kochsalzgruppen”. Die Häufigkeit, mit der Schaum aus den Nasenlöchern abfloß, differierte signifikant zwischen den drei Gruppen. Sie scheint vom Salzgehalt der Ertrinkungsflüssigkeit abzuhängen. Es gab keinen signifikanten Unterschied zwischen den Milchsäurekonzentrationen der drei Gruppen. Die Elektrolytgehalte (Na und Cl) im Blut der rechten Herzhälfte spiegelten die Natur der Ertrinkungsflüssigkeit wider.
    Notizen: Summary Three kinds of drowning media, i.e., fresh water, isotonic saline, and hypertonic saline were used. After a rat was placed in a desiccator, measuring 17 cm in height and 14 cm in diameter, the vessel was filled with fluid. The average survival time of about 2.5 min did not differ significantly among the three groups. The hypertonic saline group showed the highest values in both the water content of the lung and the lung/body weight ratio; however, this group did not differ significantly from the isotonic saline group in either of the parameters. The difference between the isotonic saline group and the fresh water group was significant. There was a significant positive correlation between the two parameters. However, the lung/body weight ratio was more sensitive to the nature of the drowning media. The frequency, with which froth appeared at the nostrils of the animals that were recovered from the fluid differed significantly among the three groups. The froth appeared almost exclusively in the rats drowned in saline solution. The appearance rate seemed to depend on the salinity of the fluid. There was no significant difference in lactate concentrations among the three groups. The electrolyte (Na and Cl) concentrations in the blood of the right side of the heart reflected the composition of the drowning media.
    Materialart: Digitale Medien
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  • 5
    ISSN: 1436-5073
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Thiazolylazophenol mit einer Methyl- bzw. Phenylgruppe am Thiazolring wurde synthetisiert und seine Eignung für die spektrophotometrische Bestimmung von Eisen(II) studiert. Diese Farbstoffe bilden mit Fe(II) bräunliche Komplexe, die charakteristische Absorption im nahen IR zeigen. Unter ihnen ist 2-(2-Benzothiazolylazo)-4-methoxyphenol am besten geeignet. Der Fe(II)-Komplex hat ein Absorptionsmaximum bei 815 nm in Chloroform. Das optimale pH für die Eisenextraktion liegt zwischen 5,5 und 9,5; das Beersche Gesetz ist bis zu 6 ppm Fe erfüllt, der molare Extinktionskoeffizient beträgt 1,47×104 l·mol−1·cm−1. Fe(II)∶BTMP=1∶2. Die Extraktionskonstante ist log Kex=−0,76±0,12. Zahlreiche Ionen stören auch in größerer Menge nicht. Die Methode wurde zur Eisenbestimmung in Gemischen mit 3d-Typ-Metallen, in natürlichen Wässern und in inländischem Schwefel angewandt.
    Notizen: Summary Thiazolylazophenols containing a methyl or a phenyl group in the thiazole ring were synthesized and their potential for the spectrophotometric determination of iron were studied. These dyes react with iron(II) to form brownish complexes, which show a characteristic absorption in near-infrared region. Among them, 2-(2-benzothiazolylazo)-4-methoxyphenol is most suitable and the iron(II) complex has the absorption maximum at 815 nm in chloroform. The optimum pH for iron extraction lies between 5.5–9.5 and Beer's law holds up to 6 ppm of iron, with a molar absorptivity of 1.47×104 1 mol−1 cm−1. The composition and the extraction constant of the complex was found to be Fe∶BTAMP=1∶2 and log Kex=−0.76±0.12, respectively. Many kinds of ions can be tolerated even in the presence of large amounts. The method has been applied to the determination of iron in mixtures containing 3d type metal ions, natural waters and native sulfurs with satisfactory results.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 299 (1982), S. 557-559 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The structure of the rotor is shown schematically in Fig. 1; it has an axis of rotation on which rests a float and three transverse bars to which blades (or vanes) are attached with wax. The axis and transverse bars are made of glass capillaries. The blades at each end of the transverse bars ...
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Neuroradiology 25 (1983), S. 105-109 
    ISSN: 1432-1920
    Schlagwort(e): Head injuries ; arteriovenous fistula ; middle meningeal vessels ; spontaneous closure ; carotid angiography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary A case is reported of a traumatic middle meningeal arteriovenous fistula, which was formed on the contralateral side to the head injury without a skull fracture and was no longer demonstrable on the repeated angiogram after 35 days without any surgical intervention. Possible mechanisms of fistula formation and its spontaneous closure are discussed.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Neuroradiology 26 (1984), S. 249-252 
    ISSN: 1432-1920
    Schlagwort(e): Hemangioma calcificans ; circumscribed brain atrophy ; enlarged subarachnoid space ; CT scan
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary A case of hemangioma calcificans is presented. On CT scan, the tumor shows no mass effect but is accompanied by circumscribed low density which is deemed to indicate brain atrophy and an enlarged subarachnoid space. A case of this tumor surrounded by peritumoral brain atrophy has not been reported before.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Planta 154 (1982), S. 100-109 
    ISSN: 1432-2048
    Schlagwort(e): Mutant (Rhizobium) ; Nodulation ; Capsule (bacterial) ; Lectin ; Polysaccharide ; Rhizobium
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Spontaneous mutants with altered capsule synthesis were isolated from a marked strain of the symbiont,Rhizobium japonicum. Differential centrifugation was used to enrich serially for mutants incapable of forming capsules. The desired mutants were detected by altered colony morphology and altered ability to bind host plant lectin. Three mutants failed to form detectable capsules at any growth phase when cultured in vitro or in association with the host (soybean,Glycine max (L.) Merr.) roots. These mutants were all capable of nodulating and attaching to soybean roots, indicating that the presence of a capsule physically surrounding the bacterium is not required for attachment or for infection and nodulation. Nodulation by several of the mutants was linearly proportional to the amount of acidic exopolysaccharide that they released into the culture medium during the exponential growth phase, indicating that such polysaccharide synthesis is important and perhaps required for nodulation. Two of the mutants appeared to synthesize normal lectin-binding capsules when cultured in association with host roots, but not when cultured in vitro. Nodulation by these mutants appeared to depend on how rapidly after inoculation they synthesized capsular polysaccharide.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Theoretical and applied genetics 61 (1982), S. 113-116 
    ISSN: 1432-2242
    Schlagwort(e): Clonal selection ; Euphorbia millii ; Anthocyanin ; Cell-pedigree ; Cultured cells
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary A high pigment-producing strain of cultured Euphorbia millii cells was isolated by clonal selection. The pigment obtained was red and consisted mainly of anthocyanin. The amount of this pigment obtained after 24 selections was seven times that found in the original cells. Statistical and cell-pedigree analyses proved that this cell strain has stable productivity for this red pigment.
    Materialart: Digitale Medien
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