21. A Biogenerated Polymetallic Catalyst from Society's WastesOreste Piccolo, Stefano Paganelli, Petro Zanatta, Sebastiano Tieuli, Laura Sperni, Franco Baldi, Iztok Arčon, Michele Gallo, Katarina Vogel-Mikuš, 2019, izvirni znanstveni članek Opis: Aims:Preparation of the new metals - polymeric composite, Met x-EPS (I), to be used as a green catalyst in water or in two-phase aqueous conditions.
Study Design:
Recovery and valorization of polymetallic
wastes to obtain directly new catalysts
using a microorganism to explore their application in removal of difficult and dangerous chemical
pollutants present in aqueous environment
Ključne besede: Metals
-
polymeric composite, biogenerated polymetallic exopolysaccharide, new catalyst
from metallic wastes, hydrodechlorination
of PCBs in water
Objavljeno v RUNG: 06.05.2019; Ogledov: 3346; Prenosov: 0
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22. Alternative Recovery and Valorization of Metals from Exhausted Catalytic Converters in a New Smart Polymetallic CatalystSebastiano Tieuli, Franco Baldi, Iztok Arčon, Katarina Vogel-Mikuš, Michele Gallo, Laura Sperni, Oreste Piccolo, Stefano Paganelli, 2019, izvirni znanstveni članek Opis: A new metals-polymeric composite, Metx-EPS (I), was prepared
to be used as catalyst in water or in two-phase aqueous
conditions. The metals source was an exhausted catalytic
converter that was grinded and treated with an acidic solution at room temperature. After filtration, the solution was concentrated, neutralized and added to a broth of Klebsiella oxytoca DSM 29614 to produce (I) where metals are embedded in a peculiar polysaccharide structure (EPS). The composite was easily recovered from the fermentation broth and purified. The process protocol was verified many times and was shown to be reproducible satisfactorily. The % recovery of metals, originally present in the converter, was good as determined by atomic
absorption. The morphology and the chemical state of main
metals in (I) were investigated by X-ray absorption spectroscopy
methods (XANES and EXAFS). No metallic alloy seems to
be evident. The catalytic activity and a possible synergic effect due to the presence of the different metals was valuated in the hydrogenation of some substrates, valuable precursors for theproduction of fine chemicals.
Ključne besede: Biogenerated polymetallic exopolysaccharide, biphasic catalysis, hydrogenation, metals-polymeric
composite, new catalyst from metallic wastes, EXAFS, XANES
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23. Cadmium localization and chemical environment in a cadmium bioindicator Gomphrena clausseniiPaula Pongrac, Mina T. Villafort Carvalho, Tânia S. Serra, Hiram Castillo Michel, Katarina Vogel-Mikuš, Iztok Arčon, Luka Jeromel, Mitja Kelemen, Boštjan Jenčič, Anja Kavčič, Primož Pelicon, Mark G. M. Aarts, 2018, objavljeni povzetek znanstvenega prispevka na konferenci Ključne besede: cadmium
Objavljeno v RUNG: 12.09.2018; Ogledov: 3587; Prenosov: 0
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26. X-ray spectrometry in plant biologyKatarina Vogel-Mikuš, Iztok Arčon, Alojz Kodre, Anja Kavčič, Peter Kump, Primož Pelicon, 2018, objavljeni povzetek znanstvenega prispevka na konferenci (vabljeno predavanje) Opis: Trace elements are essential components of living systems, but at the same time they can be toxic at concentrations beyond those necessary for their biological functions. In addition, the toxicity can be extended to other non-essential elements of very similar atomic characteristics that can mimic the properties of a trace element.
Trace element malnutrition affects more than half of the world’s population, while on the other hand industrialization, traffic and extensive use of fertilizers have resulted in exceedingly high concentrations of non-essential elements in food crops, posing risks to human health.
In order to be able to develop and improve phyto-technologies that enable production of safe and quality food, knowledge on the basic mechanisms involved in trace and non-essential element uptake, transport, accumulation and ligand environment in plants is needed.
Such studies are nowadays supported by highly sophisticated X-ray based techniques, such as synchrotron based X-ray fluorescence spectrometry, proton induced X-ray emission and X-ray absorption spectroscopy, enabling imaging of element distribution and determination of speciation and ligand environment of trace elements in biological tissues and cells with high spatial resolution and sensitivity.
Selected case studies of metal distribution and speciation in selected model and crop plants, achieved by interdisciplinary work, will be presented.
Ključne besede: X-ray spectrometry, plants, XANES, EXAFS
Objavljeno v RUNG: 12.09.2018; Ogledov: 3525; Prenosov: 0
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27. Cadmium associates with oxalate in calcium oxalate crystals and competes with calcium for translocation to stems in the cadmium bioindicator Gomphrena clausseniiPaula Pongrac, Tania Serra, Hiram Castillo Michel, Katarina Vogel-Mikuš, Iztok Arčon, Mitja Klemen, Boštjan Jencic, Anja Kavčič, Mina T. Villafort Carvalho, Mark G. M. Aarts, 2018, izvirni znanstveni članek Opis: Cadmium (Cd) was shown to co-localise with calcium (Ca) in oxalate crystals in the stems and leaves of
Cd tolerant Gomphrena claussenii, but Cd binding remained unresolved. Using synchrotron radiation
X-ray absorption near edge spectroscopy we demonstrate that in oxalate crystals of hydroponically
grown G. claussenii the vast majority of Cd is bound to oxygen ligands in oxalate crystals (488%;
Cd–O–C coordination) and the remaining Cd is bound to sulphur ligands (Cd–S–C coordination). Cadmium
binding to oxalate does not depend on the amount of Ca supplied or from which organs the crystals
originate (stems and mature leaves). By contrast, roots contain no oxalate crystals and therein Cd is
bound predominantly by S ligands. The potential to remove Cd by extraction of Cd-rich oxalate crystals
from plant material should be tested in phytoextraction or phytomining strategies.
Ključne besede: Cd XANES, Cd oxalate, Gomphrena claussenii
Objavljeno v RUNG: 06.09.2018; Ogledov: 3319; Prenosov: 0
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28. PM SPECIAL – ALLDELES NY UPPTÄCKT INOM SUPERNOVOR OCH GRAVITATIONSLINSNINGTanja Petrushevska, Katarina Bendtz, druga izvedena dela Opis: I dagarna offentliggjordes att astrofysikerna på (iPTF) Intermediate Palomar Transient Factory detekterat en supernova typ 1a som vars ljus just nu böjs av en galax. Fenomenet kallas ”gravitational lensing” och är en effekt av att rumtiden kröks av massiva objekt, som vi diskuterade i Professor Magenta avsnitt om maskhål. Tanja Petrushevska är doktorand på Stockholms universitet och medlem av iPTF. Hon och de andra i iPTF skriver just nu på artikeln om upptäckten som hon berättar mer om i detta PM special!
Ključne besede: interview, astrophysics outreach
Objavljeno v RUNG: 06.02.2018; Ogledov: 3221; Prenosov: 0
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29. Biotransformation of copper oxide nanoparticles by the pathogenic fungus Botrytis cinereaEva Kovačec, Marjana Regvar, Johannes Teun van Elteren, Iztok Arčon, Tamás Papp, Darko Makovec, Katarina Vogel-Mikuš, 2017, izvirni znanstveni članek Opis: Two plant pathogenic fungi, Botrytis cinerea and Alternaria alternata, isolated from crop plants, were
exposed to Cu in ionic (Cu2þ), microparticulate (MP, CuO) or nanoparticulate (NP, Cu or CuO) form, in
solid and liquid culturing media in order to test fungal response and toxic effects of the mentioned
compounds for the potential use as fungicides. B. cinerea has shown pronounced growth and lower levels
of lipid peroxidation compared to A. alternata. Its higher resistance/tolerance is attributed mainly to
biotransformation of CuO and Cu NPs and CuO MPs into a blue compound at the fungal/culturing media
interface, recognized by Cu K-edge EXAFS analysis as Cu-oxalate complex. The pronounced activity of
catechol-type siderophores and organic acid secretion in B. cinerea induce leaching and mobilization of
Cu ions from the particles and their further complexation with extracellularly secreted oxalic acid. The
ability of pathogenic fungus to biotransform CuO MPs and NPs hampers their use as fungicides. However
the results show that B. cinerea has a potential to be used in degradation of Cu(O) nanoparticles in
environment, copper extraction and purification techniques.
Ključne besede: copper, metal oxide nanoparticles, detoxification mechanisms, metal pollution, Cu-oxalate
Objavljeno v RUNG: 23.08.2017; Ogledov: 4359; Prenosov: 0
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30. Proposals for integrating karst aquifer evaluation methodologies into national environmental legislationsKatarina Kosič Ficco, 2015 Opis: Characterization of karst aquifers in order to reduce the impacts of human activities on these vital groundwater resources poses a significant challenge for scientists, land managers and policy makers. Methods and criteria for improvement of karst management have been suggested by the scientific community in order to assure the preservation of karst groundwater resources. However, these methods are rarely integrated into national groundwater protection policies. A case-based study of a swine confined animal feeding operation sited on mantled karst terrain in the southern Ozark Highlands in the State of Arkansas, United States of America helped illustrate why karst-specific evaluation methods should be implemented in national legislation. Through the review of the area’s geomorphology and hydrogeology, dye tracer test results, and existing state and federal legislation and permitting processes for confined animal feeding operations, proposed improvements to existing legislation for confined animal feeding operations were developed. The study provides an example of how integrating science into policy-making can enhance protection of valuable groundwater resources.
The original publication is published in Sustainable Water Resources Management, Springer, ISSN 2363-5037 Volume 1 Number 4, in 2015. The final publication is available at https://link.springer.com/article/10.1007/s40899-015-0032-5.
Ključne besede: Karst aquifers, Vulnerability, Groundwater protection, Legislation, CAFO
Objavljeno v RUNG: 05.07.2017; Ogledov: 4191; Prenosov: 0
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