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  • Articles: DFG German National Licenses  (20)
  • 1980-1984  (18)
  • 1960-1964  (2)
  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 289 (1981), S. 572-574 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [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 ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 350 (1980), 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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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Neurosurgical review 7 (1984), S. 233-252 
    ISSN: 1437-2320
    Keywords: Clinical application ; imaging techniques ; methodology ; positron emission tomography ; radiochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    International journal of legal medicine 90 (1983), S. 1-6 
    ISSN: 1437-1596
    Keywords: Drowning, lung water content ; Relative lung weight, drowning ; Ertrinken, Wassergehalt der Lunge ; Relatives Lungengewicht, Ertrinken
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: 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.
    Notes: 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.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 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.
    Notes: 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.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 299 (1982), S. 557-559 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [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 ...
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Ce cas est celui d'une enfant qui présentait à la naissance une large masse rétroauriculaire que le diagnostique clinique identifiait comme étant un hémangiome. La radio thérapie eut de très bons résultats. A onze ans on pratiqua l'ablation d'un sarcome cérébelleux qui ne semblait pas avoir été causé par la tumeur rétroauriculaire. Après traitement à moutarde nitrogénée et après trois appliquations de rayon X s'échelonnants pendant neuf mois et demi-soit une dose de radiation d'environ 7,953 r — son état s'aggrava. Pendant quatre traitements de «neutron capture», dirigés principalement sur la région sous-occipitale, on remarqua une amélioration spectaculaire, la malade pouvant s'asseoir et étant même capable de converser pendant quelque temps. Après ce traitement, la tumeur qui s'étendait dans la région sous-occipitale et dans la cou disparut, ainsi que presque toute la tumeur qui se trouvait dans le tiers dorsal du cervelet particulièrement dans la région la plus proche de l'aire sous-occipitale. Dans le tiers moyen cérébelleux on trouva également des agrégats de tumeurs plus ou moins grands, dont quelques-uns calcifiés, qui étaient isolés par un tissu conjonctif hyperplasique. Dans le tiers ventral du cervelet la tumeur ne cessa de croître dans la région non-irradiée par les neutrons. La tumeur était un sarcome d'origine périvasculaire située principalement dans la couche réticulaire cérébelleuse. La vie de la malade fut prolongée d'environ huit mois par le traitement de «neutron capture».
    Notes: Summary This paper deals with a girl who at birth had a large retroauricular mass diagnosed clinically as hemangioma. It responded well to X-ray therapy. When she was 11 years old, a sarcoma was removed from the cerebellum. No evidence could be found that the sarcoma had originated from the retroauricular tumor. After the use of nitrogen mustard locally and after three courses of X-ray therapy to the tumor over a period of 9 1/2 months — a total radiation dose of approximately 7,953 r — the patient was growing moribund. During 4 neutron-capture treatments, which were directed chiefly toward the suboccipital region, striking improvement occurred — to such an extent that the patient was able for a time to sit up in a wheelchair and converse. As a result of the therapy, all tumor which had spread suboccipitally and into the neck vanished, as did also virtually all tumor in the dorsal third of the cerebellum, i.e., in the region receiving the largest concentration of thermal neutrons. In the middle third of the cerebellum large and small tumor aggregates, some of them calcified, were necrotic and were walled off by hyperplastic connective tissue. In the ventral third of the cerebellum, in a region presumably out of the range of an effective concentration of thermal neutrons, the tumor grew unimpeded. Evidence indicated that the sarcoma in our case originated in the vascular sheath, chiefly about vessels in the granular layer of the cerebellum. Life was prolonged approximately 8 months by the neutron-capture therapy.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 25 (1983), S. 105-109 
    ISSN: 1432-1920
    Keywords: Head injuries ; arteriovenous fistula ; middle meningeal vessels ; spontaneous closure ; carotid angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: 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.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 26 (1984), S. 249-252 
    ISSN: 1432-1920
    Keywords: Hemangioma calcificans ; circumscribed brain atrophy ; enlarged subarachnoid space ; CT scan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-2048
    Keywords: Mutant (Rhizobium) ; Nodulation ; Capsule (bacterial) ; Lectin ; Polysaccharide ; Rhizobium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
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