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  • 1
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Our Solar System was formed from a cloud of gas and dust. Most of the dust mass is contained in amorphous silicates, yet crystalline silicates are abundant throughout the Solar System, reflecting the thermal and chemical alteration of solids during planet formation. (Even primitive bodies such ...
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Active galactic nuclei (AGNs) display many energetic phenomena—broad emission lines, X-rays, relativistic jets, radio lobes—originating from matter falling onto a supermassive black hole. It is widely accepted that orientation effects play a major role in explaining the ...
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1574-695X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: We have tested the ability of protein I/II, an adhesin from oral streptococci, to stimulate the production of pro-inflammatory cytokines by synovial cells isolated from both rheumatoid arthritis and control patients. Protein I/II triggers synovial fluid cells to produce interleukin (IL)-6 and IL-8 while secretion of tumor necrosis factor-α (TNF-α) was less enhanced. Using fibroblast-like synoviocytes, we found that protein I/II also exerts an immunomodulatory effect (IL-6 and IL-8 release) on these cells. These findings indicate that, if it gains access to the joint cavity, protein I/II could participate in the initiation and/or perpetuation of rheumatic diseases, by stimulating pro-inflammatory cytokine release from various synovial cells.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1433-0385
    Keywords: Keywords: Siliconomas – Siliconlymphadenopathy – Siliconoil. ; Schlüsselwörter: Silikonome – Silikonlymphadenopathie – Silikonöl.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Anfang der 60 er Jahre war die Augmentation der Brust durch Injektion von flüssigem Silikon eine sicher geglaubte Methode, welche ob des simplen Eingriffs und des raschen Erfolgs allzu oft unkritisch angewandt wurde. Als Komplikationen, welche diese Methode in Verruf brachten, wurden lokale Silikonome, entzündliche Infiltrationen und Indurationen, Fremdkörperextrusionen, sowie Fremdkörpermigrationen beschrieben. In der vorliegenden Arbeit wird über den Jahrzehnte langen Krankheitsverlauf einer 45 jährigen Patientin mit einer in der Literatur noch nicht erwähnten Spätkomplikation, der chronisch rezidivierenden, lokal destruierenden Form eines Silikonoms, berichtet. Die lokal destruierende Wirkung des flüssigen Silikons und der sekundären Silikonome erforderte eine beidseitige subcutane Mastektomie, sowie zahlreiche Silikonomexstirpationen auch außerhalb der ursprünglichen Applikationsstelle. Mehrfache plastisch-chirurgische Brustrekonstruktionen wurden durch den ungewöhnlich aggressiven und rezidivierenden Verlauf der Silikonome zerstört. Aufgrund der möglichen jahrelangen Latenz Silikon-assoziierter Komplikationen empfehlen wir eine konsequente Nachuntersuchung für betroffene Patienten aus den frühen Tagen der flüssigen Silikoninjektion.
    Notes: Abstract. At the beginning of the sixties the injection of liquid silicon oil was frequently used for breast augmentation. It was thought to be safe, simple and effective. But as complications such as local silconomas, inflammatory reactions, induration, foreign body extrusion and foreign body migration were published this procedure was not used anymore. We report about a 45-year-old female patient who suffered from late complications, chronic recurrent local destructive siliconomas, which have not been described in the literature yet. Because of the destruction forced by the primary siliconimplant a bilateral subcutaneous mastectomy had to be performed and siliconomas were excised at regions different from the original injection site. Several breast reconstructions have been performed but this tissue has also been destroyed by the recurrent and aggressive siliconomas. As there can be a long period of latency before the aforementioned complications of liquid silicon injections can occur, we recommend careful follow-up for these patients.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of clinical monitoring and computing 16 (2000), S. 263-268 
    ISSN: 1573-2614
    Keywords: Portapres device ; thermodilution method ; cardiac output ; critical care unit ; hemodynamics ; Bland and Altman Statistics ; sepsis ; respiratory problems ; catecholamines ; finger arterial perfusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Medicine
    Notes: Abstract Objective.This study was carried out to compare cardiac output measurements determined by thermodilution and by Portapres, a non-invasive system. Design, patients and setting.Eighty-seven non-invasive blood pressure measurements were performed in 46 patients in our critical care unit utilising the new, non-invasive Portapres system. Cardiac output values were obtained from these blood pressure values using an aortic impendance model and compared to cardiac output values estimated by the thermodilution technique.Measurements and main results.Statistically significant (p〈 0.01) differences (2.3 l/min; limits of agreement ±  5l/min) were noted between invasive and non-invasive cardiac output measurements. Differences in measured cardiac outputs increased for patients receiving catecholamine therapy, in patients with hemodynamic instability(e.g., sepsis and cardiac insufficiency), in patients with artificial ventilation, in patients with long duration of intensive care, in younger(〈60 yr) patients and in women. We found no influence of the body mass index (BMI) on the accuracy of Portapres results. In only one single subgroup,10 patients with pulmonary diseases, Portapres measurements were not statistically significant different from reference results. Conclusions.To date, Portapres measurements cannot replace thermodilution cardiac output estimations. Fluctuations of finger arterial perfusion due to hemodynamic instability, hypothermia and catecholamines may be responsible for problems of Portapres use in critically ill patients.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 118 (2000), S. 391-399 
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study electron transport through single and double quantumdots with large level spacing and charging energy. Motivatedby recent experiments we focus on linear and nonlinearresponse of two model systems: a single dot with two levelsand a capacitively coupled double dot. At low temperature andstrong coupling to the leads, quantum fluctuations and Kondo-like many-body effects become important and show up, e.g., asresonances in the current-voltage characteristics. Inparticular, we propose a way to observe the splitting of theKondo peak as a function of the applied bias voltage.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 118 (2000), S. 409-419 
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We develop a perturbative renormalization-group method in realtime to describe nonequilibrium properties of discrete quantumsystems coupled linearly to an environment. We include energybroadening and dissipation and develop a cutoff-independentformalism. We apply the method to charge fluctuations insingle-electron devices at low temperatures. We presentquantitatively reliable results for the conductance inmetallic islands and in the mixed-valence and empty-orbitalregime of the nonequilibrium Anderson impurity model. Weconsider a finite charging energy and include all chargestates.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 2000 (2000), S. 369-374 
    ISSN: 1434-1948
    Keywords: Phosphanylcarbenes ; Substituent effects ; Quantum chemical calculations ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A phosphanyl group exerts much less π-conjugation properties than an amino group. On this basis, corresponding carbene structures exhibit much smaller singlet-triplet energy separations. Of the various structures investigated quantum-chemically the largest singlet-triplet energy separations are predicted for cyclic diphosphanylcarbenes, in which the two functional groups are incorporated into a ring system and the phosphorus atoms are substituted by phosphoraniminato groups. Then the singlet-triplet energy separations become essentially larger than for the Bertrand-type (push-pull) carbenes.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 2000 (2000), S. 375-381 
    ISSN: 1434-1948
    Keywords: Fluorine ; Silicon ; Ab initio calculations ; Donor-acceptor systems ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Quantum chemical calculations at the ab initio level indicate that Lewis donors such as amine or water form weak donor-acceptor complexes with fluoro-substituted silanes. The strength of the donor-acceptor formation increases with increasing degree of fluorine substitution. Amine and water form strong adducts only for tetrafluorosilane. The higher element homologues of Lewis donors, such as phosphane and sulfur dihydride, do not in essence coordinate. A considerable role in donor-acceptor formation is exerted by chelation effects which impose intramolecular interactions on functionalized ligands. The corresponding structures are explored.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Book
    Book
    London u.a. :Academic Press,
    Title: Multigrid
    Author: Trottenberg, Ulrich
    Contributer: Oosterlee, Cornelis , Schöller, Anton
    Publisher: London u.a. :Academic Press,
    Year of publication: 2000
    Pages: 631 S.
    Type of Medium: Book
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