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- 저자 : Riina, Maria Vittoria (검색결과 3 건)
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Guizani Chamseddine,Widsten Petri,Siipola Virpi,Paalijärvi Riina,Berg Jonathan,Pasanen Antti,Kalliola Anna,Torvinen Katariina 한국탄소학회 2024 Carbon Letters Vol.34 No.1
Engineering of activated carbons (ACs) through chemical activation of organic precursors has been extensively studied for a wide variety of biopolymers, biomasses, wastes and other fossil-based precursors. Despite huge efforts to engineer evermore performant and sustainable ACs, “searching-for-the-best-recipe” type of studies are more the rule than the exception in the published literature. Emerging AC applications related to energy and gas storage require strict control of the AC properties and a better understanding of the fundamentals underlying their engineering. In this study, we provide new insights into the K2CO3 chemical activation of plant-based polyphenols—lignins and tannins—through careful thermoanalytical and structural analyses. We showed for the the first time that the reactivity of polyphenols during K2CO3 chemical activation depends remarkably on their purity and structural properties, such as their content of inorganics, OH functionalities and average molecular weight. We also found that the burn-off level is proportional to the K2CO3/lignin impregnation ratio (IR), but only within a certain range—high impregnation ratios are not needed, unlike often reported in the literature. Furthermore, we showed for the first time that the K2CO3 chemical activation of different carbon surfaces from lignins and tannins can be modelled using simple global solid-state decomposition kinetics. The identified activation energies lay in the range of values reported for heterogenous gas-carbon surface gasification reactions (O2-C, H2O-C, or CO2-C) in which the decomposition of C(O) surface complexes is the common rate-limiting step.
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Golding, Brian,Acutis, Pier Luigi,Peletto, Simone,Grego, Elena,Colussi, Silvia,Riina, Maria Vittoria,Rosati, Sergio,Mignone, Walter,Caramelli, Maria Canadian Science Publishing 2008 Genome Vol.51 No.12
<P> A reminder that another paper on the cetacean PRNP locus has been published before Kim et al.’s paper (2008. Genome, 51: 452-464) is presented along with a consideration of the related results. </P>
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Omar Tanweer,Taylor A. Wilson,Eleni Metaxa,Howard A. Riina,Hui Meng 대한뇌혈관외과학회 2014 Journal of Cerebrovascular and Endovascular Neuros Vol.16 No.4
Objective : Cerebral aneurysms (CAs) and abdominal aortic aneurysms (AAAs)are degenerative vascular pathologies that manifest as abnormal dilationsof the arterial wall. They arise with different morphologies in differenttypes of blood vessels under different hemodynamic conditions. Althoughtreated as different pathologies, we examine common pathways in theirhemodynamic pathogenesis in order to elucidate mechanisms of formation. Materials and Methods : A systematic review of the literature was performed. Current concepts on pathogenesis and hemodynamics were collected andcompared. Results : CAs arise as saccular dilations on the cerebral arteries of the circleof Willis under high blood flow, high wall shear stress (WSS), andhigh wall shear stress gradient (WSSG) conditions. AAAs arise as fusiformdilations on the infrarenal aorta under low blood flow, low, oscillatingWSS, and high WSSG conditions. While at opposite ends of the WSSspectrum, they share high WSSG, a critical factor in arterial remodeling. This alone may not be enough to initiate aneurysm formation, but mayignite a cascade of downstream events that leads to aneurysm development. Despite differences in morphology and the structure, CAs and AAAs sharemany histopathological and biomechanical characteristics. Endothelial celldamage, loss of elastin, and smooth muscle cell loss are universal findingsin CAs and AAAs. Increased matrix metalloproteinases and otherproteinases, reactive oxygen species, and inflammation also contribute tothe pathogenesis of both aneurysms. Conclusion : Our review revealed similar pathways in seemingly differentpathologies. We also highlight the need for cross-disciplinary studies toaid in finding similarities between pathologies.
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