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3444. The effect of dissimilatory manganese reduction on lactate fermentation and microbial community assemblyBreda Novotnik, Jackie Zorz, Steven Bryant, Marc Strous, 2019, original scientific article Keywords: manganese reduction, birnessite, fermentation, mixed culture, microbial community, Shewanella
Published in RUNG: 04.10.2019; Views: 3283; Downloads: 0
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3445. Uranium isotope fractionation during adsorption, (co) precipitation, and biotic reductionDuc Huy Dang, Breda Novotnik, Wei Wang, Bastian R. Georg, Douglas R. Evans, 2016, original scientific article Abstract: Uranium contamination of surface environments is a problem associated with both U-ore extraction/processing and situations in which groundwater comes into contact with geological formations high in uranium. Apart from the environmental concerns about U contamination, its accumulation and isotope composition have been used in marine sediments as a paleoproxy of the Earth’s oxygenation history. Understanding U isotope geochemistry is then essential either to develop sustainable remediation procedures as well as for use in paleotracer applications. We report on parameters controlling U immobilization and U isotope fractionation by adsorption onto Mn/Fe oxides, precipitation with phosphate, and biotic reduction. The light U isotope (235U) is preferentially adsorbed on Mn/Fe oxides in an oxic system. When adsorbed onto Mn/Fe oxides, dissolved organic carbon and carbonate are the most efficient ligands limiting U binding resulting in slight differences in U isotope composition (δ238U = 0.22 ± 0.06‰) compared to the DOC/DIC-free configuration (δ238U = 0.39 ± 0.04‰). Uranium precipitation with phosphate does not induce isotope fractionation. In contrast, during U biotic reduction, the heavy U isotope (238U) is accumulated in reduced species (δ238U up to −1‰). The different trends of U isotope fractionation in oxic and anoxic environments makes its isotope composition a useful tracer for both environmental and paleogeochemical applications.
Keywords: Uranium, fractionation, biotic, abiotic, oxides
Published in RUNG: 04.10.2019; Views: 2966; Downloads: 0
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3446. Near-Ground Profile of Bora Wind Speed at Razdrto, SloveniaMarija Bervida, Samo Stanič, Klemen Bergant, Benedikt Strajnar, 2019, original scientific article Abstract: Southwest Slovenia is a region well-known for frequent episodes of strong and gusty Bora wind, which may damage structures, affect traffic, and poses threats to human safety in general. With the increased availability of computational power, the interest in high resolution modeling of Bora on local scales is growing. To model it adequately, the flow characteristics of Bora should be experimentally investigated and parameterized. This study presents the analysis of wind speed vertical profiles at Razdrto, Slovenia, a location strongly exposed to Bora during six Bora episodes of different duration, appearing between April 2010 and May 2011. The empirical power law and the logarithmic law for Bora wind, commonly used for the description of neutrally stratified atmosphere, were evaluated for 10-min averaged wind speed data measured at four different heights. Power law and logarithmic law wind speed profiles, which are commonly used in high resolution computational models, were found to approximate well the measured data. The obtained power law coefficient and logarithmic law parameters, which are for modeling purposes commonly taken to be constant for a specific site, were found to vary significantly between different Bora episodes, most notably due to different wind direction over complex terrain. To increase modeling precision, the effects of local topography on wind profile parameters needs to be experimentally assessed and implemented.
Keywords: Bora wind, logarithmic law, power law, roughness length, wind profile
Published in RUNG: 04.10.2019; Views: 3566; Downloads: 109
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3448. Identification of New DR5 Agonistic Nanobodies and Generation of Multivalent Nanobody Constructs for Cancer TreatmentGolnaz Sadeghnezhad, Ema Romao, Robert Alvin Bernedo-Navarro, Sam Massa, Khosro Khajeh, Serge Muyldermans, Sadegh Hassania, 2019, original scientific article Keywords: death receptor 5, nanobody, TRAIL, cancer therapy, apoptosis
Published in RUNG: 01.10.2019; Views: 3100; Downloads: 0
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3449. A novel functionalization strategy for the dispersion of permanently magnetic barium-hexaferrite nanoplatelets in biological mediaTanja Goršak, Darko Makovec, Uroš Javornik, Blaž Belec, Slavko Kralj, Darja Lisjak, 2019, published scientific conference contribution abstract Keywords: colloidal stability, magnetic, nanoplatelet, biological media, dextran
Published in RUNG: 30.09.2019; Views: 4010; Downloads: 0
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3450. Synthesis of adsorbent-free ultrathin Bi2Se3 Topological Insulator Platelets and Its Inherent Surface PropertiesBlaž Belec, Katja Ferfolja, Tanja Goršak, Nina Kostevšek, Sandra Gardonio, Mattia Fanetti, Matjaž Valant, 2019, published scientific conference contribution abstract Keywords: Bismuth selenide, topological insulator, hydrothermal synthesis, surface properties
Published in RUNG: 30.09.2019; Views: 3424; Downloads: 0
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