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  • 1990-1994  (30)
  • 1965-1969  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 47 (1969), S. 1268-1269 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In cerebrospinal fluids (CSF) of patients with acute inflammatory cerebral diseases, brain atrophies and tumours of the CNS we observed a higher activity of adenosine deaminase than in normal persons. Activities in CSF of patients with epilepsies, vascular, degenerative and chronical inflammatory cerebral diseases did not differ from normal values. The range of activities found in normal CSF was 0–0,26 IU. The results were discussed. The estimation of adenosine deaminase activity in CSF was commended as an additional diagnostical method in unclear neurological diseases.
    Notes: Zusammenfassung Im Liquor läßt sich zu hohen Prozentsätzen bei akut entzündlichen cerebralen Erkrankungen, Hirnatrophien und Tumoren im Bereich des ZNS eine erhöhte spezifische Aktivität der Adenosindesaminase nachweisen. Die übrigen untersuchten Krankheitsbilder, wie Epilepsien, gefäßbedingte, degenerative und chronisch entzündliche Erkrankungen des ZNS zeigten keine Unterschiede zur Normalaktivität, die in einem Bereich von 0–0,26 IE festgelegt wurde. Die Befunde werden diskutiert und die Bestimmung der Adenosindesaminase in Liquores als ergänzende Untersuchung bei neurologisch unklaren Erkrankungen empfohlen.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The design of a novel electrode structure for electric-field ionization of Rydberg atoms in a fast atomic beam is described. It allows the resolution of the ion signal from Rydberg atoms with adjacent effective principal quantum numbers n* in the range of 14≤n*≤40 and minimizes the volume where field ionization takes place. These features drastically reduce the number of background events arising from collisions of fast atoms with residual gas molecules and thus are essential for trace analysis applications of the technique of resonance ionization spectroscopy in collinear geometry.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1055-1058 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new excitation/detection scheme for Fourier-transform–ion-cyclotron-resonance (FT-ICR) studies is described. The ions are created in the center of a hyperbolic Penning trap and excited to a large magnetron radius. Parametric-mode excitation is used to drive the cyclotron motion. The ions are detected in the conventional dipole-mode detection scheme by use of a segmented ring electrode. Since the resonance frequencies of excitation (ν+−ν−) and detection (ν+, the reduced cyclotron frequency) differ by the magnetron frequency (ν−), this method allows the simultaneous excitation and detection of the ion motion.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Laser resonance ionization has been applied to ionize radioactive atoms released from thick ISOLDE/CERN targets. Laser light from pulsed dye lasers with a high repetition rate (10 kHz) was used for stepwise excitation and ionization. By this method, efficiency as well as the selectivity of the target/ion source system could be improved. In a series of off-line and on-line studies, the resonance ionization of elements with different ionization potentials, such as Yb (Ei=6.2 eV), Tm (Ei=5.8 eV) and Sn (Ei=7.3 eV), was investigated. For Yb, photoionization efficiencies of up to 15% have been measured. An efficiency of 0.2% was obtained for Sn at the on-line separator ISOLDE-3. However, this value can be improved by about two orders of magnitude using a transition to an autoionizing state at 59 375.9 cm−1.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0649
    Keywords: 07.77 ; 07.80 ; 32.80 F ; 14.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report here on the development of a high-temperature laser ion source useful for trace analysis and other applications. It consists of a high temperature ionization chamber, three tunable dye lasers pumped by copper vapor lasers for stepwise resonant ionization and a Mattauch-Herzog mass spectrometer for the analysis of photo-ions. The principle of the laser ion source and its theoretical efficiency are discussed, where the efficiency of a laser ion source is the ratio of photo-ions extracted out to the number of atoms introduced into the cavity. Experimentally, an efficiency of 2×10−3 has been achieved for technetium. The scheme of gated detection is described which is used for suppressing isobaric background of molybdenum. The possible improvements are briefly mentioned for achieving isotopic analysis of 108 atoms of 97,98Tc in the presence of 1015 atoms of molybdenum, as separated chemically from molybdenum ore. Such an analysis of technetium isotopes produced in molybdenite ore by a (v,e −) reaction, is expected to yield information about the solar neutrino flux.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 188 (1966), S. 300-307 
    ISSN: 1432-1459
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wurden nahezu zellfreie Liquores von 60 Patienten mit verschiedenen Erkrankungen des ZNS und 5 Kontrollpersonen auf den Gehalt an folgenden, meist zellstrukturgebundenen Oxydoreduktasen untersucht: NADH2- und NADPH2-Oxydasen mit O2 als Elektronenacceptor, endogene NADH2- (NADPH2)-Oxydationsraten, NADH2- und NADPH2-Oxydoreduktasen mit Ferricyanid und 2,6-Dichlorphenolindophenol als Elektronenacceptoren, Vitamin K3-Reduktase, NADH2- und NADPH2-Cytochrom c-Reduktasen und Glutathionreduktase. NADH2- und NADPH2-Oxydasen mit O2, Ferricyanid und 2,6-Dichlorphenolindophenol als Elektronenacceptoren, Vitamin K3-Reduktase und NADPH2-Cytochrom c-Reduktase waren in keinem Fall nachweisbar. Nur in zwei von 20 untersuchten Liquores von Patienten mit gefäßbedingten Blutungen konnte das Vorkommen von NADH2-Cytochrom c-Reduktase gesichert werden. Ein Liquor von getesteten Tumorpatienten enthielt deutlich Glutathionreduktaseaktivität. Ansonsten fanden sich beide letztgenannten Fermente in keinem weiteren Liquor. Die endogene NADH2-Oxydationsrate betrug bei Tumoren im pH-Optimum (6–6,5) 7, bei allen übrigen Fällen etwa 3 μ M/min und 1000 ml Liquor. Eine endogene NADPH2-Oxydation wurde in keinem Fall beobachtet. Die Frage nach dem Austritt strukturgebundener Oxydoreduktasen (Elektronentransportfermente) in den Liquor bei verschiedenen Erkrankungen des ZNS muß am Beispiel der getesteten Enzyme vorerst verneint werden.
    Notes: Summary The following oxidoreductases were measured in nearly cell-free specimens of cerebrospinal fluid from 60 patients with various diseases of the CNS and from 5 normal controls: NADH2 (NADPH2)-oxidases with molecular oxygen, ferricyanide or 2,6-dichlorophenolindophenol as electron acceptors; the rates of endogenous NADH2 (NADPH2)-oxidation and activities of vitamine K3 reductase, NADH2 (NADPH2)-cytochrome c reductases and glutathione reductase. There were no oxidase activities at all when molecular oxygen, ferricyanide and dichlorophenolindophenol served as electron acceptors nor vitamine K3 reductase or NADPH2-cytochrome c reductase activities. Only 2 out of 20 specimens of cerebrospinal fluid from patients with cerebrovascular hemorrhages exhibited NADH2-cytochrome c reductase activity. One of the tumor patients clearly showed glutathione reductase activity. No activities of these two enzymes were found in the other specimens. The rate of endogenous NADH2-oxidation at the optimal pH of 6–6.5 amounted to 7 μM per minute and 1000 ml cerebrospinal fluid in tumor patients and to 3 μM in all other cases. An endogenous NADPH2-oxidation was never demonstrable. Most of the enzymes investigated in this study are bound to cellular structures. They do not appear to be released into the cerebrospinal fluid in the disease entities which were subject of this investigation.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1459
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In Ergänzung früherer Untersuchungen werden an Hand von Abbildungen klinischer und besonders tierexperimentell erzeugter Liquorzellpräparate die Ergebnisse zur formalen Genese der Riesenzellen besprochen und vier Bildungswege für die Entstehung der Riesenzellen im Bereich des Subarachnoidalraumes aufgezeigt. Dabei konnte festgestellt werden, daß der primär syncytialen Entstehung der Riesenzellen (Fresen) neben der amitotischen Kern- ohne Plasmateilung eine besondere Bedeutung bei der Bildung mehr- oder vielkerniger Riesenzellen zukommt. Darüber hinaus lassen sich in der mitotischen Kernteilung und Confluenz von Einzelzellen zwei weitere Bildungsmöglichkeiten nachweisen. Allerdings kommt diesen beiden Entstehungsformen nur eine untergeordnete Bedeutung zu, da sie nur relativ selten im Liquorzellsediment anzutreffen sind. Auch wenn diese Befunde besonders an Fremdkörperriesenzellen erhoben wurden, muß für die Langhansschen Riesenzellen die gleiche Genese angenommen werden. Die unterschiedlichen Ansichten bei der Entstehung der Riesenzellen werden danach aufgezeigt und im einzelnen diskutiert. Abschließend werden einige Fragen zur kausalen Genese der Riesenzellen erörtert. Da sich die Riesenzellen wie die reticulären Zellen und somit Makrophagen im Liquor aus dem leptomeningealen Mesenchym entwickeln, biologisch vollwertig und zur Phagocytose befähigt sind, kann man sie auch als eine besondere Form der reticulären Makrophagen bezeichnen.
    Notes: Summary In expanding previous studies, micrographs of preparations of cerebrospinal fluid cells obtained from clinical cases and particularly from animal experiments were evaluated. The results are discussed as they relate to the morphogenesis of giant cells. Four possible ways in which giant cells may develop in the subarachnoid space are suggested. Besides the amitotic division of nuclei without division of the cytoplasm, the primary syncytial formation of giant cells (Fresen) was found to be of particular significance for the development of bi- or multinuclear cells. In addition, the mitotic mode of division of the nucleus and the fusion of single cells are two other ways. However, the latter two possibilities are of lesser importance as they are only seldomly seen in cell sediments of cerebrospinal fluid. The assumptions presented above are also to hold true of the formation of Langhans' giant cells even though the observations of the present study were made on foreign body giant cells. The different opinions expressed on the formal evolution of giant cells are pointed out and discussed in detail. Some aspects of the causes entailing the formation of giant cells are considered. Giant cells may also be termed a special form of reticular macrophages since the giant cells of cerebrospinal fluid arise from the leptomeningeal mesenchyma similarly to reticular cells, i.e. macrophages, and since they are biologically viable and capable of phagocytosis.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 340 (1991), S. 109-110 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The very neutron deficient nucleus 104Sn has been identified in in-beam spectroscopy using the reaction50Cr(58Ni, 2p2n) and neutron and charged particle multiplicity filter detectors. Excited states up to I ≈ 10 and Ex=4 MeV were observed and the level scheme is discussed in the frame work of the spherical shell model.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 336 (1990), S. 113-114 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A superdeformed band was observed in194Pb in a spectroscopic investigation with the OSIRIS array. The dynamic moment of inertiaJ (2) is very similar to the ones observed for superdeformed bands in192Hg and194Hg. This suggests that the high-N intruder configuration π64 ν74 determines the properties of the superdeformed core also in194Pb.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1434-601X
    Keywords: 21.10.−k ; 23.20.Ck ; 27.80.+w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The level structure of196Po has been studied using a160Dy(40Ar, 4n) reaction and a recoil-catcher technique to reduce fission. The results showed a sharp drop off in the first (2+) and (4+) energies relative to systematics implying an abrupt increase in the quadrupole collectivity at N=112. In addition, second (2+) and(4+) states were identified at 859 and 1388 keV, respectively, suggesting the discovery of a 4p2h deformed band in Po isotopes which is related to known 2p2h proton bands in several Pb isotopes. A prompt183W(20Ne, 5n@#@) experiment located similar second 2+ and 4+ states at 1039 and 1483 keV in198Po providing corroboration and extended information on the properties of the new Po deformed bands. A measured halflife of 850 (90) ns for the 2491 keV (11−) state in196Po implied collective E3 contributions to the extractedB (@#@ E3; 11−→8+)=27(5) W.u.
    Type of Medium: Electronic Resource
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