1,163 research outputs found

    Актуальні проблеми державного регулювання фармацевтичного ринку України

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    ДВНЗ «Київ. нац. екон. ун-т ім. Вадима Гетьмана»В статті розглянуто сучасні методи державного регулювання фармацевтичного ринку України. Висвітлено проблеми, пов’язані з їх застосуванням в умовах кризових явищ 2008–2009 рр. Особливу увагу приділено тим механізмам державного регулювання, запровадження яких обумовлюється подальшою інтеграцією України в європейський та загальносвітовий економічні простори. Оцінено реальність та можливу ефективність окремих напрямів державного регулювання

    Primitive substitution tilings with rotational symmetries

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    This work introduces the idea of symmetry order, which describes the rotational symmetry types of tilings in the hull of a given substitution. Definitions are given of the substitutions σ6 and σ7 which give rise to aperiodic primitive substitution tilings with dense tile orientations and which are invariant under six- and sevenfold rotations, respectively; the derivation of the symmetry orders of their hulls is also presented

    Novel synthesis of benzimidazole by Ring Contraction Rearrangement of benzodiazepine

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    Condensation of substituted aromatic ketones (acetophenone) and substituted aldehydes give unsaturated ketones 14 (chalcones) which react with o-phenylenediamine 7 to afford the corresponding benzodiazepines 15. Treatments of benzodiazepines under basic conditions give benzimidazole derivatives. Structures of all synthesized compounds have been characterized by their NMR and mass spectral data.Keywords: N’-Thioacylamidines, Chalcone, o-phenylenediamine, benzodiazepine, benzimidazole

    On the Frequency Module of the Hull of a Primitive Substitution Tiling

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    Understanding the properties of tilings is of increasing relevance to the study of aperiodic tilings and tiling spaces. This work considers the statistical properties of the hull of a primitive substitution tiling, where the hull is the family of all substitution tilings with respect to the substitution. A method is presented on how to arrive at the frequency module of the hull of a primitive substitution tiling (the minimal -module, where is the set of integers) containing the absolute frequency of each of its patches. The method involves deriving the tiling\u27s edge types and vertex stars; in the process, a new substitution is introduced on a reconstructed set of prototiles

    On color fixing groups associated with colored symmetrical tilings

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    In this paper, we contribute to the study of colored symmetrical tilings by giving formulas for their associated color fixing groups. In the second part of the paper we provide an application of the results in describing symmetry groups of nanostructures

    Electrical stimulation for enhanced denitrification in woodchip bioreactors: Opportunities and challenges

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    Woodchip bioreactors are being implemented for the removal of nitrates in groundwater and tile water drainage. However, low nitrate removals in denitrifying woodchip bioreactors have been observed for short hydraulic retention time (HRT) and low water temperature (°C). One potential approach to improve woodchip bioreactor performance is to provide an alternative and readily available electron source to the denitrifying microorganisms through electrical stimulation. Previous work has demonstrated the capability of bio-electrochemical reactors (BER) to remove a variety of water contaminants, including nitrate, in the presence of a soluble carbon source. The objective of this study was to evaluate the denitrification efficiency of electrically augmented woodchip bioreactors and conduct a simple techno-economic analysis (TEA) to understand the possibilities and limitations for full-scale BER implementation for treatment of agricultural drainage. Up-flow column woodchip bioreactors were studied included two controls (non-energized, and without electrodes), two electrically enhanced bioreactors, each using a single 316 stainless steel anode coupled with graphite cathodes, and two electrically enhanced bioreactors, each with graphite for both anode and cathodes. Both pairs of electrically enhanced bioreactors demonstrated higher denitrification efficiencies than controls when 500 mA of current was applied. While this technology appeared promising, the techno-economic analysis showed that the normalized N removal cost ($/kg N) for BERs was 2–10 times higher than the base cost with no electrical stimulation. With our current reactor design, opportunities to make this technology cost effective require denitrification efficiency of 85% at 100 mA. This work informs the process and design of electrically stimulated woodchip bioreactors with optimized performance to achieve lower capital and maintenance costs, and thus lower N removal cost

    Islet autoantibody status in a multi-ethnic UK clinic cohort of children presenting with diabetes.

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    OBJECTIVE: We prospectively determined islet autoantibody status in children presenting with diabetes to a single UK region in relation to ethnicity. DESIGN: 316 (68.0% non-white) children presenting with diabetes between 2006 and 2013 were tested centrally for islet cell autoantibodies (ICA) and glutamic acid decarboxylase autoantibodies (GAD-65) at diagnosis, and if negative for both, tested for insulin autoantibodies (IAA). The assay used to measure GAD-65 autoantibodies changed from an in-house to a standardised ELISA method during the study. RESULTS: Even with use of the standardised ELISA method, 25.8% of children assigned a diagnosis of type 1 diabetes still tested negative for all three autoantibodies. 30% of children assigned a diagnosis of type 2 diabetes were autoantibody positive, and these had the highest glycated haemoglobin (HbA1c) levels at 12 months follow-up compared with other groups (p value for analysis of variance <0.001), although the sample size was small. Autoantibody positivity was similar between non-white and white children regardless of assay used (60.0% (n=129) vs 56.4% (n=57), χ2=0.9, p=0.35), as was mean GAD-65 autoantibody levels, but fewer non-white children had two or more autoantibodies detectable (13% (n=28) vs 27.7% (n=28), χ2=12.1, p=0.001). CONCLUSION: Islet autoantibody positivity was associated with a more severe phenotype, as demonstrated by poorer glycaemic control, regardless of assigned diabetes subtype. Positivity did not differ by ethnic group
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