340 research outputs found

    Isolation and properties of human luteinizing hormone subunits

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    Effects of 3,5,3'-triiodothyronine on collagen synthesis by cultured human skin fibroblasts

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    AbstractAddition of 3,5,3'-triiodothyrinine (T3) (10−9-10−7 M) to the media of cultured skin flbroblasts was shown to decrease the amount of newly synthesized soluble proteins, including collagen. Polyacrylamide gel electrophoresis of newly synthesized collagen demonstrated that addition of the hormone did not affect the processing of the molecule

    Internet and Democracy. Summary

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    НАУКОВІ ДОСЛІДЖЕННЯ ВЧЕНИХ КВГУ-КГІ-ДГІ В ГАЛУЗІ МЕТАЛУРГІЇ (1900-1930 рр.)

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    Перші зародки промислового вуглевидобутку на Півдні Російської імперії (Лисячий Байрак під Лисичанськом) і виробництва металу (м. Луганськ) виник-ли у 90-х роках ХVІІІ с. У наступні десятиліття ці взаємопов’язані галузі розвивалися дуже повільно. А трохи раніше спроба почати видобуток залізної руди і виплавку з неї гарматних ядер на Криворіжжі була невдалою, тому майже на сто років про ці поклади руд забули

    Deconvolution of complex G protein-coupled receptor signaling in live cells using dynamic mass redistribution measurements

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    Label-free biosensor technology based on dynamic mass redistribution (DMR) of cellular constituents promises to translate GPCR signaling into complex optical 'fingerprints' in real time in living cells. Here we present a strategy to map cellular mechanisms that define label-free responses, and we compare DMR technology with traditional second-messenger assays that are currently the state of the art in GPCR drug discovery. The holistic nature of DMR measurements enabled us to (i) probe GPCR functionality along all four G-protein signaling pathways, something presently beyond reach of most other assay platforms; (ii) dissect complex GPCR signaling patterns even in primary human cells with unprecedented accuracy; (iii) define heterotrimeric G proteins as triggers for the complex optical fingerprints; and (iv) disclose previously undetected features of GPCR behavior. Our results suggest that DMR technology will have a substantial impact on systems biology and systems pharmacology as well as for the discovery of drugs with novel mechanisms

    Netzöffentlichkeit und digitale Demokratie : Tendenzen politischer Kommunikation im Internet

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    Nach der Interneteuphorie um das Jahr 2000 und der anschließenden Phase der Ernüchterung wächst derzeit wieder das Interesse an den Chancen und Herausforderungen, die sich aus der politischen Nutzung des Internets für die Demokratie ergeben. Besondere Aufmerksamkeit verdienen hier viele neue und dynamische Entwicklungen im Bereich der politischen Netzöffentlichkeit. Der Wandel politischer Öffentlichkeit durch das Netz mit seinen zahlreichen Aspekten und Facetten steht daher im Zentrum dieses Buchs. Aufbauend auf einer komprimierten Darstellung technischer und kultureller Eigenheiten netzbasierter Kommunikation sowie des Forschungsstandes thematisieren die Autoren vor allem zwei Anwendungsbereiche des Internets: Zum einen widmen sie sich den Programmen zur digitalen Demokratie und den Onlineangeboten zentraler politischer Akteure auf nationaler und internationaler Ebene, vor allem den institutionellen Diskussionsangeboten nationaler Parlamente. Zum anderen untersuchen sie aktuelle Tendenzen im Bereich nicht-staatlicher politischer Netzöffentlichkeit. Dabei werden auch Ergebnisse empirischer Analysen ausgesuchter Themenöffentlichkeiten im Netz vorgestellt, die eigens für diese Publikation durchgeführt wurden

    Internet und Demokratie. Endbericht zum TA-Projekt Analyse netzbasierter Kommunikation unter kulturellen Aspekten

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    Use of combinations of antipsychotics: McLean Hospital inpatients, 2002

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    Background The empirical use of combinations of antipsychotic agents appears to be increasing with little research support for the relative efficacy, safety or cost-effectiveness of this practice. Such treatment was evaluated in hospitalized psychiatric patients. Methods Samples of consecutive inpatients treated with > 2 ('polytherapy') vs 1 antipsychotic ('monotherapy') were matched on age, sex, diagnosis and admission clinical ratings, and these groups were compared on total daily chlorpromazine-equivalent doses, days in hospital, and changes in clinical ratings between admission and discharge. Results The study sample included 69 polytherapy and 115 well-matched monotherapy subjects. Despite matching for initial CGI and GAF ratings, polytherapy was associated with high PANSS subscale scores of positive symptoms among affective psychosis, and relatively greater PANSS subscale ratings of excitement-agitation among patients diagnosed with schizophrenia. Estimated clinical improvement during hospitalization was similar among poly- and monotherapy patients, but total daily CPZ-eq doses at discharge averaged twice-greater with polytherapy, and hospitalization lasted 1.5 times longer. Conclusions Antipsychotic polytherapy as well as the types of agents combined may reflect clinician responses to particular symptom patterns. The value of specific combinations of antipsychotic agents and their comparison with monotherapies requires specific, prospective, randomized and well-controlled trials that consider matching on clinical characteristics and truly comparable doses across regimens. Copyright (c) 2005 John Wiley & Sons, Ltd

    Host jumps shaped the diversity of extant rust fungi (Pucciniales)

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    * The aim of this study was to determine the evolutionary time line for rust fungi and date key speciation events using a molecular clock. Evidence is provided that supports a contemporary view for a recent origin of rust fungi, with a common ancestor on a flowering plant. * Divergence times for > 20 genera of rust fungi were studied with Bayesian evolutionary analyses. A relaxed molecular clock was applied to ribosomal and mitochondrial genes, calibrated against estimated divergence times for the hosts of rust fungi, such as Acacia (Fabaceae), angiosperms and the cupressophytes. * Results showed that rust fungi shared a most recent common ancestor with a mean age between 113 and 115 million yr. This dates rust fungi to the Cretaceous period, which is much younger than previous estimations. Host jumps, whether taxonomically large or between host genera in the same family, most probably shaped the diversity of rust genera. Likewise, species diversified by host shifts (through coevolution) or via subsequent host jumps. This is in contrast to strict coevolution with their hosts. * Puccinia psidii was recovered in Sphaerophragmiaceae, a family distinct from Raveneliaceae, which were regarded as confamilial in previous studies
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