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RISS 인기검색어
- 검색키워드
- 저자 : ra-Marek, Kinga (검색결과 3 건)
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Infected False Aneurysm of Brachiocephalic Trunk - Rare but Highly Lethal Cause of Dyspnea
Marek Hudák,Martin Koščo,Mária Rašiová 대한혈관외과학회 2023 Vascular Specialist International Vol.39 No.2
False aneurysm of the brachiocephalic trunk is a very rare but highly lethal, lifethreatening, and difficult-to-treat condition. In this report, we present a case of a patient who suffered from rapidly worsening dyspnea caused by infected false aneurysm of the brachiocephalic trunk compressing the trachea that was successfully treated by stent graft implantation. The main purpose of this article is to consider other, less common causes of dyspnea and to explain the pathogenesis of infected true/false aneurysm and its management. Due to the rarity, history-taking and physical examination should be thorough, and symptoms and signs should be analyzed deeply. Simplification should be avoided during diagnosis. In addition, we would like to highlight the option of stent grafts as an alternative to surgery in the management of patients suffering from infected aneurysm who are at high surgical risk.
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Gó,ra-Marek, Kinga,Brylewska, Kamila,Tarach, Karolina A.,Choi, Minkee The Royal Society of Chemistry 2015 Dalton Transactions Vol.44 No.17
<P>This work was attempted in order to provide a new and well-established approach for the quantification of Fe<SUP>2+</SUP> sites in zeolites. The experimental procedure was based on carbon monoxide and nitrogen monoxide sorption in Fe-exchanged ZSM-5 zeolites with different pore hierarchies, which was followed by IR spectroscopy. The values of the absorption coefficients of the respective monocarbonyl Fe<SUP>2+</SUP>(CO) and mononitrosyl Fe<SUP>2+</SUP>(NO) IR bands were obtained. In turn, the concentrations of Fe(<SMALL>II</SMALL>) moieties of various kinds were calculated and discussed with regard to the composition (Si/Al and Fe/Al ratios) of the zeolites studied.</P> <P>Graphic Abstract</P><P>This work was attempted in order to provide a new and well-established approach for the quantification of Fe<SUP>2+</SUP> sites in zeolites. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5dt00424a'> </P>
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Gó,ra-Marek, Kinga,Tarach, Karolina,Choi, Minkee American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.23
<P>This work was aimed to evidence that substituted pyridine, 2,6-di-<I>tert</I>-butylpyridine, is a suitable probe for the quantitative investigation of the external acidity in hierarchically structured zeolites. The 2,6-di-<I>tert</I>-butylpyridine was too large to enter the micropores, even in wide pore zeolites, and nearly no sites in nonmesoporous zeolites were available. Accessibility studies of acid sites in zeolites TNU-9 and BEA involving quantitative IR measurements with hindered 2,6-di-<I>tert</I>-butylpyridine as a probe were performed. The extinction coefficients of the 1615 cm<SUP>–1</SUP> diagnostic bands of 2,6-di-<I>tert</I>-butylpyridine interacting with Brønsted acid sites were determined. Lewis acid sites were not detected with the probe. The accessibility factor (AF) for the 2,6-di-<I>tert</I>-butylpyridine probe molecule was defined as the number of sites detected by adsorption of the dTBPy (external sites) divided by the total amount of acid sites in the studied zeolites as quantified by pyridine sorption. Upon desilication resulting in the fabrication of the secondary mesopores, the enhanced accessibility of the protonic sites was observed. In comparison to the mesoporous zeolites with the secondary system of mesopores generated by alkaline leaching, considerably higher accessibility of protonic sites was evidenced in both ultrathin ZSM-5 and delaminated ITQ-2 zeolite.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-23/jp501928k/production/images/medium/jp-2014-01928k_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp501928k'>ACS Electronic Supporting Info</A></P>
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