1,057 research outputs found

    Kinetic analysis of an efficient DNA-dependent TNA polymerase.

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    alpha-l-Threofuranosyl nucleoside triphosphates (tNTPs) are tetrafuranose nucleoside derivatives and potential progenitors of present-day beta-d-2'-deoxyribofuranosyl nucleoside triphosphates (dNTPs). Therminator DNA polymerase, a variant of the 9 degrees N DNA polymerase, is an efficient DNA-directed threosyl nucleic acid (TNA) polymerase. Here we report a detailed kinetic comparison of Therminator-catalyzed TNA and DNA syntheses. We examined the rate of single-nucleotide incorporation for all four tNTPs and dNTPs from a DNA primer-template complex and carried out parallel experiments with a chimeric DNA-TNA primer-DNA template containing five TNA residues at the primer 3'-terminus. Remarkably, no drop in the rate of TNA incorporation was observed in comparing the DNA-TNA primer to the all-DNA primer, suggesting that few primer-enzyme contacts are lost with a TNA primer. Moreover, comparison of the catalytic efficiency of TNA synthesis relative to DNA synthesis at the downstream positions reveals a difference of no greater than 5-fold in favor of the natural DNA substrate. This disparity becomes negligible when the TNA synthesis reaction mixture is supplemented with 1.25 mM MnCl(2). These results indicate that Therminator DNA polymerase can recognize both a TNA primer and tNTP substrates and is an effective catalyst of TNA polymerization despite changes in the geometry of the reactants

    Quantitative Analyse von Entzündungszellen und Vaskularisation bei Kieferosteomyelitis

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    Gegenstand dieser Arbeit war die quantitative Erfassung und Untersuchung der Entzündungszellen, die im Rahmen einer Osteomyelitiserkrankung der Kiefer auftreten. Da die Entzündungszellen und die Vaskularisation bei einer Entzündungsreaktion und ihrer Heilung die zentrale Rolle spielen, wurde in 27 Proben von osteomyelitisch veränderten Unterkieferknochen die Anzahl der Zellen und Kapillaren pro Flächeneinheit gemessen und mit 9 gesunden Knochenproben verglichen. Die Proben wurden formalinfixiert, in Paraffin gebettet, geschnitten und fotografiert. Die Bilder wurden am Computer durch Auszählen der Zellen und Kapillaren pro definierter Fläche quantitativ ausgewertet. Im Ergebnis zeigte sich, dass bei der chronischen Osteomyelitis eine vermehrte Anzahl an Osteozyten, Osteoblasten, Osteoklasten und Immunzellen vorliegen. Die Kapillaranzahl und die Zahn der leeren Osteozytenhöhlen überwiegen jedoch im gesunden Knochen

    Potential Effects of Industrial Air Pollution and Wood-Product Supply and Demand, and Structure of the Wood-Products Industry, in Poland

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    This study aimed to determine potential changes in the production structure of the wood-processing industry up to 2020, resulting from unfavorable impact of industrial pollutants upon forests in Poland. The paper consists of four chapters. In the first section, forecasts of consumer demand for forest products, based on patterns of actual demand, are presented. The structure of industrial demand for wood assortments, and the degree to which it is met, are the topics of the second chapter. In the third chapter, we present forecasts of the possibilities of wood-raw-material consumption by industry with regard to the unfavorable impact of industrial pollution. The last chapter contains forecasts of production regarding foreseen changes in the structure of the wood-processing industry, taking into account qualitative changes in wood raw-material and expected changes in techniques and technology. Our results show that, up to 2020, negative effects of industrial pollutants on forests will have a significant influence on the degree of meeting consumer demands for wood products

    Study of W± boson in the ALICE muon spectrometer: considerations and analysis using the HLT tool

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    W± bosons produced in proton-proton collisions can be observed in the ALICE muon spectrometer via their decay into single muons at a transverse momentum, pt ~ Mw/2 40 GeV/c. However the identification of these single muons is complicated by a large amount of muonic background, especially in the low pt region. Therefore, it is necessary to apply precise pt cuts below the region of interest. This can be done by means of the High Level Trigger (HLT). In this paper we present the performance of detecting high pt muons at the HLT level. In order to improve the momentum resolution of the L0 trigger, fast clusterization of the tracking chambers together with L0 trigger matching and fast tracking reconstruction is applied. This will reduce the background in the high pt muon analysis

    Real Time Global Tests of the ALICE High Level Trigger Data Transport Framework

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    The High Level Trigger (HLT) system of the ALICE experiment is an online event filter and trigger system designed for input bandwidths of up to 25 GB/s at event rates of up to 1 kHz. The system is designed as a scalable PC cluster, implementing several hundred nodes. The transport of data in the system is handled by an object-oriented data flow framework operating on the basis of the publisher-subscriber principle, being designed fully pipelined with lowest processing overhead and communication latency in the cluster. In this paper, we report the latest measurements where this framework has been operated on five different sites over a global north-south link extending more than 10,000 km, processing a ``real-time'' data flow.Comment: 8 pages 4 figure

    Building zeolites from precrystallized units: nanoscale architecture

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    This is the peer reviewed version of the following article: Angew. Chem. Int. Ed. 2018, 57, 15330 15353, which has been published in final form at https://doi.org/10.1002/anie.201711422. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.[EN] Since the early reports by Barrer in the 1940s on converting natural minerals into synthetic zeolites, the use of precrystallized zeolites as crucial inorganic directing agents to synthesize other crystalline zeolites with improved physicochemical properties has become a very important research field, allowing the design, particularly in recent years, of new industrial catalysts. This Review highlights how the presence of some crystalline fragments in the synthesis media, such as small secondary building units (SBUs) or layered substructures, not only favors the crystallization of other zeolites with similar SBUs or layers, but also permits control over important parameters affecting their catalytic activity (chemical composition, crystal size, or porosity, etc.). Recent advances in the preparation of 3D and 2D zeolites through seeding and zeolite-to-zeolite transformation processes will be discussed extensively in this Review, including their preparation in the presence or absence of organic structure-directing agents (OSDAs). The aim is to introduce general guidelines for more efficient approaches for target zeolites.This work has been supported by the Spanish Government (MINECO through "Severo Ochoa" (SEV-2016-0683) and MAT2015-71261-R), by the European Union through ERC-AdG-2014-671093 (SynCatMatch), and by the Fundacion Ramon Areces (through the "Life and Materials Science" program).Li, C.; Moliner Marin, M.; Corma Canós, A. (2018). Building zeolites from precrystallized units: nanoscale architecture. Angewandte Chemie International Edition. 57(47):15330-15353. https://doi.org/10.1002/anie.201711422S15330153535747Cundy, C. S., & Cox, P. A. (2005). The hydrothermal synthesis of zeolites: Precursors, intermediates and reaction mechanism. Microporous and Mesoporous Materials, 82(1-2), 1-78. doi:10.1016/j.micromeso.2005.02.016Martínez, C., & Corma, A. (2011). Inorganic molecular sieves: Preparation, modification and industrial application in catalytic processes. 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