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  • 1
    Electronic Resource
    Electronic Resource
    Viability and recovery of frozen-thawed human islets and in vivo quality control by xenotransplantation (1999)
    Springer
    Journal of molecular medicine 77 (1999), S. 172-174 
    Details
    ISSN: 1432-1440
    Keywords: Key words Islets of Langerhans ; Cryopreservation ; Vitrification ; Transplantation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Cryopreservation of islets of Langerhans offers advantages for the transplantation into diabetic patients. In this study two different methods of cryopreservation were compared with respect to islet viability and recovery after cryostorage. It was also investigated whether human islet survival in mice was affected by cryopreservation. Aliquots of human islets were cryopreserved conventionally or vitrified, respectively. After rapid thawing, islet viability and islet equivalent (IEQ) recovery rate were determined. Aliquots of freshly isolated or conventionally cryopreserved islets were transplanted beneath the kidney capsule of non-diabetic C57BL/6 mice. After three days renal insulin content was determined. Islet cell viability was 17.3±8.0% for vitrified and 51.8±3.0% for conventionally cryopreserved islets; the recovery rate was 84.8±12.2% and 92.8±12.4%, respectively. Insulin recovery after transplantation was 25.6±7.3% for fresh and 24.1±7.4% for cryopreserved islets. This study suggests that the conventional method of cryopreservation is superior to vitrification with respect to islet viability after thawing. We found no significant difference between fresh and cryopreserved islets with respect to insulin recovery after transplantation into mice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001090050330
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  • 2
    Electronic Resource
    Electronic Resource
    A comparative study of x-ray emission from laser spots in laser-heated hohlraums relative to spots on simple disk targets (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 778-787 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper we report the results of experiments that compare the x-ray emission from a laser spot in a radiation-filled hohlraum to that from a similar laser spot on a simple disk target. The studies were done using the Nova laser facility [J. D. Lindl, Phys. Plasmas 2, 3933 (1995)] in its 0.35 μm wavelength, 1 ns square pulse configuration. Focal spot intensities were 2–3.5×1015 W/cm2. X-ray images measured x-ray conversion in a hohlraum and from an isolated disk simultaneously. A laser spot inside a hohlraum emitted more x rays, after subtracting the background emission from the hohlraum walls, than a spot on a disk. Numerical models suggest the enhanced spot emission inside the hohlraum is due to an increase in lateral transport relative to the disk. Filamentation in the hohlraum will also increase the spot size. The models agree fairly well with the results on spot spreading but do not explain the overall increase in conversion efficiency. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872172
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  • 3
    Electronic Resource
    Electronic Resource
    Diagnosis of pusher-fuel mix in spherical implosions using x-ray spectroscopy (invited) : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 689-696 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Of primary concern in next generation inertial confinement fusion (ICF) implosion experiments is Rayleigh–Taylor (RT) instability of the pusher-fuel interface occurring upon acceleration and deceleration of the pusher. This results in mixing of hot fuel with cold pusher material. One method of diagnosing mix in this case is to place spectroscopic dopants both in the capsule fuel region and the innermost region of the capsule wall adjacent to the fuel. As the degree of pusher/fuel mix is increased (typically through placement of controlled perturbations on the outer surface of the capsule) the pusher dopant x-ray emission increases relative to that of the fuel dopant. Experiments of this type using indirectly driven implosions have been carried out on Nova. In this paper we describe some of the important physics issues underlying spectral line formation in these targets and discuss how they are manifested in the modeling and interpretation of experimental data. The importance of radiative transfer as well as high density plasma phenomena such as continuum lowering and Stark broadening is demonstrated. We provide an overview of recent Nova hydrodynamic instability experiments and discuss how the level of instability growth implicit in a given capsule design impacts the diagnosis of mix through x-ray spectroscopy. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146260
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  • 4
    Electronic Resource
    Electronic Resource
    Arterioportale Fisteln im extrahepatischen Stromgebiet der A. hepatica communis Diagnostik und radiologisch interventionelle Therapie (1996)
    Springer
    Der Radiologe 36 (1996), S. 586-590 
    Details
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Arterioportale Fistel ; Embolisation ; Ultraschall ; Spiral-CT ; Angio-CT ; Key words Arterioportal fistula ; Embolization ; Ultrasound ; Spiral CT ; Angio-CT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Two cases of arterioportal fistulas and new possibilities in diagnosis and treatment are reported: A 62-year-old women was admitted to our hospital with abdominal pain. Color flow duplex sonography showed an arterioportal fistula between the proper hepatic artery and the ectatic portal vein that was confirmed by angiography, permitting percutaneous embolization as a definitive treatment. The pain disappeared immediately. A 36-year-old man underwent surgery due to a penetrating gastric ulcer. He was referred to us with an abdominal murmur. Color flow duplex sonography proved by spiral CT with 3 D reconstruction and maximum intensity projection (angio-CT) revealed an arteriovenous fistula between the gastroduodenal artery and a mesenteric branch. Angiography confirmed the diagnosis and permitted definitive therapeutic embolization.
    Notes: Zusammenfassung Es werden anhand von 2 Patienten mit extrahepatischen arterioportalen Fisteln die Möglichkeiten der Diagnostik und Therapie aufgezeigt. Eine 62 jährige Patientin kam mit abdominellen Beschwerden zur Aufnahme. Die farbkodierte Duplexsonographie (FKDS) zeigte eine Fistel zwischen A. hepatica propria und V. portae, was sich in der Angiographie bestätigte, die die perkutane Embolisation als definitive Therapie ermöglichte. Ein 36 jähriger Patient unterzog sich einer Magenteilresektion bei penetrierendem Ulcus ventriculi. In der zur Klärung eines Strömungsgeräusches durchgeführten FKDS fand sich ein grobes Vibrationsartefakt, das sich im ergänzenden Spiral-CT nach Rekonstruktion einer Fistel zwischen A. gastroduodenalis und einem Mesenterialvenenast zuordnen ließ. Die Angiographie bestätigte den Befund und ermöglichte die Embolisation als definitive Therapie.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001170050114
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  • 5
    Electronic Resource
    Electronic Resource
    Selective electrogenerative oxidation of benzyl alcohol with platinum–graphite packed-bed anodes (1997)
    Springer
    Journal of applied electrochemistry 27 (1997), S. 1-8 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The selective electrogenerative oxidation of benzyl alcohol in 1M sulfuric acid solutions was studied on several types of graphite supported platinum packed-bed anodes in a hybrid continuous-flow cell with an oxygen gas diffusion cathode. Benzaldehyde formed preferentially on all three catalytic packed-beds under electrogenerative conditions (Eanode〈0.75V) where the platinum catalyst was not irreversibly oxidized. Tin–palladium chloride graphite-pretreatment before platinum deposition through ethanol reduction significantly enhanced catalytic activity. This electrocatalyst provided current densities as high as 77mAcm-2 (superficial packed-bed cross sectional area) with a platinum loading of 0.89wt% Pt on graphite at relative low polarization. The origin of the catalytic activity is discussed and evidence is presented on the roles of tin and palladium. Benzyl alcohol oxidation appears to provide a sensitive probe reaction for demonstrating the existence of special types of catalytic centres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026497229223
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  • 6
    Electronic Resource
    Electronic Resource
    Electrogenerative formation of ferric ions in a sulfur dioxide–sulfuric acid solution; Graphite catalysed sulfur dioxide oxidation (1998)
    Springer
    Journal of applied electrochemistry 28 (1998), S. 1127-1136 
    Details
    ISSN: 1572-8838
    Keywords: ferrous inhibition ; mediated oxidation ; remediation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The electrogenerative oxidation of ferrous ions in 3m sulfuric acid, containing sulfur dioxide and subsequent sulfur dioxide oxidation, were studied in connection with potential regenerable sulfur dioxide remediation processes. The presence of sulfur dioxide in the feed stream did not affect cell performance. Oxidation of sulfur dioxide in the electrogenerative reactor took place when high ferrous to ferric ion conversions were obtained. Low cost graphite and iron ions served as an effective mediating system for promoting electron transfer to sulfur dioxide in strong acid solutions. In contrast, the homogenous reaction between iron(iii) and sulfur dioxide is relatively slow. In a separate batch reactor, the heterogeneous iron(iii) and sulfur dioxide reaction was found to be graphite catalysed, accounting for sulfur dioxide conversion observed in the electrogenerative reactor. Ferrous ion presence should be minimized, because it inhibits the desired catalysed reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003456114113
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  • 7
    Electronic Resource
    Electronic Resource
    Electrochemical sulphur dioxide oxidation with platinum-aluminum electrocatalysts (1995)
    Springer
    Journal of applied electrochemistry 25 (1995), S. 353-357 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Platinum-aluminum electrocatalysts supported on carbon black were investigated for electrogenerative sulfur dioxide (SO2) oxidation in hybrid type, liquid-phase SO2/O2 cells. Incorporation of aluminum with platinum electrocatalysts on carbon resulted in an electrocatalytic activity increase for S02 oxidation over the whole investigated range (1–30 at % aluminum). Significant synergistic effect from aluminum was observed when even a small amount, as little as 1 at %, was incorporated in the platinum. A maximum 68 % improvement was obtained when 10 at % aluminum was incorporated in the platinum. Results of an ESCA study and electrochemical platinum surface area measurement supported the hypothesis of an electronic interaction between platinum and aluminum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249654
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