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31.
Mirjana Küzma Robert Dominko Anton Meden Darko Makovec Marjan Bele Janko Jamnik Miran Gaberšček 《Journal of power sources》2009
We demonstrate, for the first time, a considerable electrochemical activity of two members of lithium transition element titanates: Li2FeTiO4 and Li2MnTiO4. Both materials consist of 10–20 nm particles embedded in a conductive carbon coating. We show that not the coating but the small particle size is decisive for materials’ activity. Li2FeTiO4 shows a stable reversible capacity of up to 123 mA hg−1 at C/20 and 60 °C which is 83% of the theoretical value for exchange of 1 electron (148 mA hg−1). Li2MnTiO4 could only be prepared in a nanosized form that contained about 30% of impurities. The capacity of the whole material (including impurities) is comparable to that of Li2FeTiO4 but the cycling stability is much poorer. In contrast to the Fe and Mn analogues, the third member of the titanate family, Li2NiTiO4, shows a good electrochemistry even when the particle size is much larger (about 100 nm). During initial cycles at C/10 and 60 °C, exchange of more than 1 electron per compound formula has been observed. The cycling stability at high temperatures, however, is poor. 相似文献
32.
Valentina Domenici Gabriela Ambro?i? Andrija Lebar Polona Umek Bla? Zupan?i? 《Polymer》2009,50(20):4837-1964
Photoactive materials based on azobenzene derivatives exhibit interesting properties related to the reversible photo-isomerisation between the trans and cis isomers of the azo-compound. In this work we report the preparation and physical-chemical characterization of Liquid Single Crystal Elastomers (LSCEs) containing azobenzene derivative side-chain mesogens as co-monomer. The interplay between the orientational ordering and mechanical response in the nematic phase is investigated by thermomechanical measurements as well as by deuteron NMR spectroscopy. We demonstrate that local nematic order can be reliably probed in azo-LSCEs using low molar mass deuterated cyanobiphenyl nematogen in low concentrations. No phase separation of the dopant is observed. The nematoelastic coupling eav(T)∝Sav(T) between the effective sample deformation and average nematic order parameter is present over a wide temperature range even in the systems with relatively large heterogeneity of the nematic order and misaligned nematic domains. 相似文献
33.
Dino Jordanoski Damjana Drobne Nea Repar Iztok Dogsa Polona Mrak Romana Cerc-Koroec Andrijana Sever kapin Peter Nadrah Natasa Poklar Ulrih 《International journal of molecular sciences》2022,23(13)
Tetraethyl-orthosilicate (TEOS)-based nanoparticles are most extensively used as a silica-based hemoglobin carrier system. However, TEOS-based nanoparticles induce adverse effects on the hemoglobin structure. Therefore, a heulandite-calcium-based carrier was investigated as a novel silica-based hemoglobin carrier system. The heulandite-calcium mesoporous aluminosilicate particles (MSPs) were fabricated by a patented tribo-mechanical activation process, according to the manufacturer, and its structure was assessed by X-ray diffraction analysis. Upon hemoglobin encapsulation, alternation in the secondary and tertiary structure was observed. The hemoglobin-particle interactions do not cause heme degradation or decreased activity. Once encapsulated inside the particle pores, the hemoglobin shows increased thermal stability, and higher loading capacity per gram of particles (by a factor of >1.4) when compared to TEOS-based nanoparticles. Futhermore, we introduced a PEGlyted lipid bilayer which significantly decreases the premature hemoglobin release and increases the colloidal stability. The newly developed hemoglobin carrier shows no cytotoxicity to human umbilical vein endothelial cells (HUVEC). 相似文献
34.
Ula tok Saa u
nik Snena Sodin-emrl Polona
igon 《International journal of molecular sciences》2021,22(9)
Antiphospholipid syndrome (APS) is a systemic autoimmune disorder characterized by thromboembolism, obstetric complications, and the presence of antiphospholipid antibodies (aPL). Extracellular vesicles (EVs) play a key role in intercellular communication and connectivity and are known to be involved in endothelial and vascular pathologies. Despite well-characterized in vitro and in vivo models of APS pathology, the field of EVs remains largely unexplored. This review recapitulates recent findings on the role of EVs in APS, focusing on their contribution to endothelial dysfunction. Several studies have found that APS patients with a history of thrombotic events have increased levels of EVs, particularly of endothelial origin. In obstetric APS, research on plasma levels of EVs is limited, but it appears that levels of EVs are increased. In general, there is evidence that EVs activate endothelial cells, exhibit proinflammatory and procoagulant effects, interact directly with cell receptors, and transfer biological material. Future studies on EVs in APS may provide new insights into APS pathology and reveal their potential as biomarkers to identify patients at increased risk. 相似文献
35.
Effect of in vitro digested cod liver oil of different quality on oxidative,proteomic and inflammatory responses in the yeast Saccharomyces cerevisiae and human monocyte‐derived dendritic cells
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36.
Polona ŠkrabaGvido Bratina Satoru IgarashiHirosi Nohira Kazuyuki Hirose 《Thin solid films》2011,519(13):4216-4219
We have investigated the effect of In diffusion on the electronic structure of a polyethylenedioxythiophene-poly (styrenesulfonate) layer deposited on InSnxO1 − x substrate by photoelectron spectroscopy. We observe additional states near the highest occupied molecular orbital of the polymer layer that are generated by In releases from the substrate. Also, we observe that In diffusion continues into an overlayer of a mixture of poly(3-hexylthiophene) and [6,6]-phenyl C61-butyric acid methyl ester. On the basis of the results of the numerical line shape analysis of In 3d5/2 core level emission, we rule out the presence of metallic In clusters within the organic layers and suggest instead that In/sulfur compounds are present within the organic layers. 相似文献
37.
Polona Smrkolj Marija Osvald Jože Osvald Vekoslava Stibilj 《European Food Research and Technology》2007,225(2):233-237
In this work, bean plants were cultivated in two different ways using two modes of selenium supplementation in the form of
sodium selenate. Each group consisted of the same four cultivars. Group A plants were grown in soil and twice foliarly sprayed
at an interval of 10 days with an aqueous solution of 10 mg Se L−1 at flowering time. Group B plants were hydroponically cultivated after the maternal seeds were soaked in nutrient solution
containing the same Se content as used for foliar fertilisation. Bean seeds obtained from group A plants accumulated much
more Se (around 2 μg g−1 dry weight) than those seeds obtained from group B plants (around 0.6 μg g−1 dry weight). No differences in Se content within each group were found. After enzyme hydrolysis, 85±7% of soluble selenium
was found in group A and 65±2% of soluble Se in group B with respect to the total Se content in seeds. In bean seed supernatants
SeMeSeCys, SeMet and two unknown species were found. These four species together represented 79±8 and 53±9% of the Se mass
fraction of group A and group B, respectively. No differences in the presence of selenium species were found between the four
cultivars and cultivation conditions. 相似文献
38.
We compared the activities of 210Pb and 210Po in samples of reeds with the concentrations in sediment and water, and estimated the capability of bioaccumulation of these
radionuclides in the reeds. The results showed that there are very high levels of 210Pb and 210Po in sediment from the Boršt stream, where mill tailings were transported. The reeds accumulate 210Pb to a slightly higher extent than 210Po and in this way help to decontaminate the water, which then flows via a channel into the Todraščica stream. We also observed
that the stream possessed a good self-cleaning capability. The Jazbec waste pile, where spoils and lower grade ores were disposed
of, is not badly contaminated with 210Pb and 210Po, and has little influence on the environment. 相似文献
39.
Polona Škraba Ladislav Kosec Milan Bizjak Rebeka Rudolf Nebojša ?. Rom?evi? Gorazd Kosec Borut Kosec Zorica ?. Lazarevi? Jo?e Roth Ivan An?el 《Corrosion Science》2011,(1):127-134
The internal oxidation (IO) of Ag–VC composites containing 5 vol.% of carbide was examined at three oxidation temperatures (350, 400, 600 °C). Two mechanisms were observed due to the formation of double oxides with relatively low-melting points. At temperatures below the lowest eutectic point in situ, or diffusion less IO, was observed with the formation and growth of oxide layers surrounding the initial carbide. At temperatures above the eutectic point IO resulted in the formation of liquid oxide pools, which grew in size and developed into a network of oxides within the metal matrix. The kinetics confirmed the presence of two distinct mechanisms. 相似文献
40.
Recently we synthesized and preliminary characterized a new material for potential use in Li-battery cathodes: Li2MnSiO4. Although its theoretical capacity is about 330 mAh g−1, the actual measurements showed a much smaller value (about 120 mAh g−1). One of the reasons for the poor performance could be the poor electronic conductivity (<10−14 S cm−1 at RT) causing a huge polarization during charge–discharge. However, in the present paper we show that reducing the particle size down to the range of 20–50 nm and additional particle embedment into a carbon phase does not significantly improve the electrochemistry of Li2MnSiO4. Observations of structural changes during the first charge shows a complete loss of peaks when reaching the nominal composition of ca. Li1MnSiO4. The peaks are not recovered during subsequent cycling. It is supposed that extraction of Li causes significant structural changes so that the resulting material is only able to reversibly exchange a limited amount of Li. 相似文献