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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Infection 23 (1995), S. 64-65 
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Computing 56 (1996), S. 95-104 
    ISSN: 1436-5057
    Keywords: 68M20 ; Probabilistic algorithm ; online scheduling ; interval ; busy time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Wir betrachten das Problem der Zuteilung von Aufgaben bestimmter Rechenzeit auf einem Rechner, um so seine Auslastung zu maximieren. Die Aufgabe besteht darin, einen probabilistischen Online-Algorithmus mit vernünftigem worst-case Performance-Verhältnis zu finden. Wir geben die Antwort auf ein offenes Problem von Lipton und Tompkins, das das bestmögliche Verhältnis betrifft. Weiter verallgemeinern wir ihre Ergebnisse auf einm-Maschinen-Analogon. Schließlich wird eine Variante des Problems analysiert, in dem der Rechner mit einem Zwischenspeicher für einen Job versehen ist.
    Notes: Abstract We consider the problem of scheduling tasks requiring certain processing times on one machine so that the busy time of the machine is maximized. The problem is to find a probabilistic online algorithm with reasonable worst case performance ratio. We answer an open problem of Lipton and Tompkins concerning the best possible ratio that can be achieved. Furthermore, we extend their results to anm-machine analogue. Finally, a variant of the problem is analyzed, in which the machine is provided with a buffer to store one job.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1289
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Auf dem VIII. Internationalen Symposium “Acute Leukemias”, das vom 27.2.–3.3.99 in Münster stattfand, widmenten sich 107 internationale Experten und 1100 Kongreßteilnehmer in neun Hauptsitzungen, sechs Satellitensymposien und zwei Postersitzungen den Themenschwerpunkten “Prognostische Faktoren” und “Therapiestrategien” für Patienten mit akuten Leukämien und diskutierten neue Ergebnisse und Analysen aktueller klinischer Studien und Grundlagen-orientierter Forschungsvorhaben.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Der Internist 40 (1999), S. 369-380 
    ISSN: 1432-1289
    Keywords: Schlüsselwörter Infektiologie ; Standortbestimmung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zum Thema Erstmals stellt sich die Infektiologie in einem Kongreßheft der Zeitschrift Der Internist vor. Dies ist auch Folge der Erkenntnis, daß dieses Fachgebiet einen immer wichtigeren Platz im Spektrum internistischer Erkrankungen einnimmt. Nahezu in jedem Schwerpunkt der Inneren Medizin und darüber hinaus sind direkte und indirekte Folgen von Infektionszuständen eine klinische Alltäglichkeit. Diese breitgefächerte Einbindung der Infektiologie ist auch ihre berufspolitische Achillesferse. Als Querschnittsfach angesehen, wird ihr die Etablierung als eigener Schwerpunkt verwehrt. Soll die Infektiologie in Deutschland jedoch wieder international wettbewerbsfähig werden, muß sie sich selbständig an Hochschulen und Kliniken einrichten. Beispiele hierfür gibt es. Die hiesige Onkologie hätte nie ihr jetziges internationales Ansehen erreicht, wenn sie nicht in eigenen universitären und klinischen Einrichtungen lehren und forschen könnte, ungeachtet der Tatsache, daß onkologische Erkrankungen in zahlreichen Disziplinen behandelt werden. Angesichts des dramatischen Erkenntniszuwachses in der Infektiologie sind Infektiologen nötiger denn je. In diesem Artikel werden die wichtigsten derzeitigen Probleme der Infektiologie mit Blick auf das nächste Jahrhundert angesprochen. Es soll aufgezeigt werden, wie die zahlreichen Veränderungen sowohl auf der Wirts- als auch auf der Erregerseite, die neuen Möglichkeiten der molekularbiologischen Erregerdiagnostik und die neuen Einsichten in infektionsimmunologische Zusammenhänge das Fachgebiet Infektiologie verändern und erweitern werden.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0584
    Keywords: Key words Cytarabine ocfosfate ; AraC ; CLL ; Pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Cytarabine ocfosfate (YNK01) is a novel orally applicable prodrug of cytosine arabinoside. Recent pharmacokinetic studies have revealed a prolonged release of the cytotoxic agent cytosine arabinoside (araC) from hepatocytes into the systemic circulation, resulting in a half-life of approximately 24 h for araC. The specific pharmacokinetic characteristics of cytarabine ocfosfate lead to a prolonged exposure of leukemic cells to this antineoplastic agent during the 14-day cycle. The oral applicability during outpatient treatment and the sustained antineoplastic activity of araC against slowly proliferating leukemic B-cells suggest that cytarabine ocfosfate might be a useful drug in the treatment of chronic lymphocytic leukemia. Four years after diagnosis of B-CLL, a 50-year-old patient was started on cytarabine ocfosfate. Sequentially, the patient's disease had proved refractory to treatment with chlorambucil/prednisone (31 months), fludarabine (5 months), and prednimustine/mitoxantrone (3 months). These established regimens were discontinued because of increasing lymphocytosis, significant thrombocytopenia, and progressive B-symptoms. Following three cycles of cytarabine ocfosfate B-symptoms resolved, lymphadenopathy disappeared, and thrombocytopenia was significantly reduced. The patient has been free of these symptoms on a dosage of 1500 mg cytarabine ocfosfate/day (cycle of 14 days with intervals of 14–21 days) for 24 months and remains in an ongoing partial remission.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0584
    Keywords: Key words Aspergillosis ; Fungal infection ; Acute myeloid leukemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Systemic aspergillosis is a well-recognized complication of chemotherapy-induced neutropenia. In this report a patient with acute myeloid leukemia is described in whom a chronic aspergillosis with systemic involvement developed after recovery from neutropenia following intensive chemotherapy and allogeneic bone marrow transplantation. The clinical features of a chronic course of systemic aspergillosis suggest a distinct clinical entity comparable to chronic systemic candidiasis.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0584
    Keywords: Key words G-CSF ; AML ; Cytosine arabinoside ; Refractory disease ; Salvage therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Patients with primary refractory or relapsed acute myeloid leukemia (AML) who undergo intensive salvage chemotherapy carry a high risk of treatment failure due to infectious complications and early relapses. The study presented here assessed the effect of granulocyte colony-stimulating factor (G-CSF) on the duration of post-treatment neutropenia, the incidence of infection-related deaths, and the disease-free and overall survival. Sixty-eight evaluable patients with relapsed and refractory AML received G-CSF 5 μg/kg per day subcutaneously starting 2 days after the completion of salvage treatment with the S-HAM regimen, consisting of high-dose cytosine arabinoside twice daily on days 1, 2, 8, and 9 and mitoxantrone on days 3, 4, 10, and 11. Ninety-one patients who were treated with the identical S-HAM regimen but without G-CSF support during a preceding study served as controls. The application of G-CSF resulted in a significant shortening of critical neutropenia of less than 500 μl (36 vs. 40 days;p=0.008), which translated into a trend towards a lower early death rate (21% vs. 30%) and an increase of complete remissions (56% vs. 47%, p=0.11). In patients younger than 60 years a significant prolongation of time to treatment failure (159 vs. 93 days, p=0.038) and of duration of disease-free survival (203 vs. 97 days, p=0.003) was observed. These results indicate a beneficial effect of G-CSF on early mortality as well as on long-term outcome when administered after S-HAM salvage therapy for advanced AML.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-0584
    Keywords: Key words Cytidine deaminase ; AraC ; AML ; Pharmacokinetics ; Pharmacodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The clinical effects of cytosine arabinoside (AraC) are highly dependent on schedule and dose. Many regimens administered to patients are derived from artificial model systems involving permanent leukemic cell lines. The differences in pharmacokinetics between the in vivo situation and such cell lines are largely neglected. However, cytidine deaminase activity in particular has a major impact on AraC pharmacokinetics by degrading AraC to its inactive metabolite AraU, and it has been shown to be of prognostic relevance in the treatment of acute myeloid leukemia. This study therefore investigated cytidine deaminase activities and AraC deamination in a variety of the most commonly used leukemic cell lines and fresh blasts and their impact on the results of an in vitro model system. It was found that cells from different cell lines (BLIN, CEM, HL60, K562, RAJI, REH, U937) vary greatly in cytidine deaminase activity (e.g., 1.89 nmol per min/mg in K562 versus 0.01 in BLIN cells) and degrade between 18.5 (BLIN) and 96.5% (REH) of AraC to AraU in the incubation medium. This degradation results in highly different AraC exposures for different cells (e.g., AUC of 960 ng per h/ml in REH versus 4048 ng per h/ml in BLIN cells) in spite of identical starting concentrations of the drug. Formation of AraCTP as the main cytotoxic metabolite of AraC is significantly influenced by the differences in cell type-dependent cytidine deaminase activity (e.g., 35.6 ng/107 cells in REH versus 180.2 ng/107 cells in BLIN cells). In contrast to permanent cell lines, fresh leukemic blasts and normal bone marrow mononuclear cells featured low AraC degradation in the model system.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-0584
    Keywords: Key words Refractoriness ; Leukodepleted blood components ; HLA-antibodies ; HPA-antibodies ; Cross-match
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The use of leukocyte-depleted blood components has become the standard therapy for multiply transfused patients during the past few years, as a measure to reduce the frequency of alloimmunization and refractoriness. We assessed frequency and causes of refractoriness, defined as a repeated 24-h post-transfusion platelet count below 20 000/μl, in 145 consecutive patients who received three or more single-donor platelet concentrates during a 1-year period. Flow-cytometric detection of anti-platelet antibodies and a glycoprotein-specific ELISA were applied for the diagnosis of alloimmunization. Forty patients (27.6%) had at least one episode of refractoriness. In 25 of these 40 patients (62.5%), nonimmune factors (fever, sepsis, coagulopathy, splenomegaly) alone were the cause. In 15 refractory patients alloantibodies were detected. In seven patients (17.5%), alloimmunization alone caused an inadequate transfusion response, while in eight refractory patients (20.0%) alloimmunization and fever or sepsis were present. HLA antibodies were detected in 17 patients (11.7%); three patients (2%) had platelet-specific antibodies in addition to HLA antibodies; in two patients panreactive platelet antibodies were detectable. All 17 patients had a history of previous transfusions or pregnancy. We did not observe primary immunization in patients transfused exclusively with filtered (leukodepleted) blood products. Our data suggest that alloimmunization in patients with a negative risk history can be prevented by the exclusive use of leukodepleted blood components.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical methods of operations research 46 (1997), S. 131-142 
    ISSN: 1432-5217
    Keywords: Ellipsoid method ; linear programming ; simplex ; volume
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract Yamnitsky and Levin proposed a variant of Khachiyan's ellopsoid method for testing feasibility of systems of linear inequalities that also runs in polynomial time but uses simplices instead of ellipsoids. Starting with then-simplexS and the half-space {x¦a Tx ≤ β}, the algorithm finds a simplexS YL of small volume that enclosesS ∩ {x¦a Tx ≤ β}. We interpretS YL as a simplex obtainable by point-sliding and show that the smallest such simplex can be determined by minimizing a simple strictly convex function. We furthermore discuss some numerical results. The results suggest that the number of iterations used by our method may be considerably less than that of the standard ellipsoid method.
    Type of Medium: Electronic Resource
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