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  • 1
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 2413-2435 
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: An kritisch verzweigten Polykondensaten aus 1,3,5-Benzoltriessigsäure und 1,10-Decandiol wurden Lichtstreuungsmessungen ausgeführt. Die Ergebnisse wurden in Anlehnung an die Theorie der Kaskadenprozesse analysiert; diese Theorie wurde, mit Hilfe der Methode der “path-weighting” (Weg-wichtenden) erzeugenden Funktion, speziell für dieses System umgeformt. Es wird postuliert, daß das Ausmaß der Kettenexpansion bei diesen verzweigten Proben im wesentlichen auf Nachbarschafts- (“short range”) Wechselwirkungen und weniger auf weitreichende (“long range”) Wechselwirkungen zurückzuführen ist. Die weitreichenden Wechselwirkungen scheinen im kritisch verzweigten Zustand zu verschwinden. Für die Berechnung der vergleichbaren ungestörten Dimensionen des linearen Homologen aus 1,3-Benzoldiessigsäure und 1,10-Decandiol wurde das Modell der rotationisomeren Zustände herangezogen.
    Notizen: Light-scattering measurements were carried out on critically branched polycondensates of 1,3,5-benzenetriacetic acid and 1,10-decanediol, and the results were analysed according to the theory of cascade processes, developed especially for this system, viz. the pathweighting generating function method. It is postulated that the amount of chain expansion found in these branched copolycondensate samples was due to short-range rather than long-range interactions. The long-range interactions seem to vanish in the critically branched state. The rotational isomeric state model was used to calculate the comparative unperturbed dimensions for the linear homologue of the above polycondensate, i.e. poly(1,3-benzenediacetic acid/1,10-decanediol).
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 20 (1982), S. 531-538 
    ISSN: 0360-6384
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Publikationsdatum: 2016-05-26
    Beschreibung: Background Elderly patients with atrial fibrillation are at higher risk of both ischemic and bleeding events compared to younger patients. In a prespecified analysis from the ENGAGE AF-TIMI 48 trial, we evaluate clinical outcomes with edoxaban versus warfarin according to age. Methods and Results Twenty-one thousand one-hundred and five patients enrolled in the ENGAGE AF-TIMI 48 trial were stratified into 3 prespecified age groups: 〈65 (n=5497), 65 to 74 (n=7134), and ≥75 (n=8474) years. Older patients were more likely to be female, with lower body weight and reduced creatinine clearance, leading to higher rates of edoxaban dose reduction (10%, 18%, and 41% for the 3 age groups, P 〈0.001). Stroke or systemic embolic event (1.1%, 1.8%, and 2.3%) and major bleeding (1.8%, 3.3%, and 4.8%) rates with warfarin increased across age groups ( P trend 〈0.001 for both). There were no interactions between age group and randomized treatment in the primary efficacy and safety outcomes. In the elderly (≥75 years), the rates of stroke/systemic embolic event were similar with edoxaban versus warfarin (hazard ratio 0.83 [0.66–1.04]), while major bleeding was significantly reduced with edoxaban (hazard ratio 0.83 [0.70–0.99]). The absolute risk difference in major bleeding (–82 events/10 000 pt-yrs) and in intracranial hemorrhage (–73 events/10 000 pt-yrs) both favored edoxaban over warfarin in older patients. Conclusions Age has a greater influence on major bleeding than thromboembolic risk in patients with atrial fibrillation. Given the higher rates of bleeding and death with increasing age, treatment of elderly patients with edoxaban provides an even greater absolute reduction in safety events over warfarin, compared to treatment with edoxaban versus warfarin in younger patients. Clinical Trial Registration URL: https://www.clinicaltrials.gov/ . Unique identifier: NCT00781391.
    Schlagwort(e): Atrial Fibrillation, Complications, Mortality/Survival, Intracranial Hemorrhage, Ischemic Stroke
    Digitale ISSN: 2047-9980
    Thema: Medizin
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    In: Science
    Publikationsdatum: 2017-06-02
    Beschreibung: The tricyclic diterpene fungal metabolite (+)-pleuromutilin has served as a starting point for antibiotic development. Semisynthetic modification of its glycolic acid subunit at C14 provided the first analogs fit for human use, and derivatization at C12 led to 12- epi -pleuromutilins with extended-spectrum antibacterial activity, including activity against Gram-negative pathogens. Given the inherent limitations of semisynthesis, however, accessing derivatives of (+)-pleuromutilin with full control over their structure presents an opportunity to develop derivatives with improved antibacterial activities. Here we disclose a modular synthesis of pleuromutilins by the convergent union of an enimide with a bifunctional iodoether. We illustrate our approach through synthesis of (+)-12- epi -mutilin, (+)-11,12-di- epi -mutilin, (+)-12- epi -pleuromutilin, (+)-11,12-di- epi -pleuromutilin, and (+)-pleuromutilin itself in 17 to 20 steps.
    Schlagwort(e): Chemistry
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Einschränkungen Verfügbarkeit
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