Repository of University of Nova Gorica

Search the repository
A+ | A- | Help | SLO | ENG

Query: search in
search in
search in
search in
* old and bologna study programme

Options:
  Reset


1 - 9 / 9
First pagePrevious page1Next pageLast page
1.
Selenium affects mercury ligand environment in terrestrial food chain – a XAS study
Katarina Vogel Mikuš, Alojz Kodre, Iztok Arčon, Anja Kavčič, 2022, published scientific conference contribution abstract

Abstract: Selenium (Se) supplied in inorganic form (as selenate or selenite) was shown to decrease mercury (Hg) toxicity by forming HgSe in soils as well as in animal and human tissues, while for plants there is no evidence of Hg-Se complexation. Although Se in not an essential element for plants it was shown to counteract various abiotic stresses when applied at trace amounts. The aim of this work was therefore to study physiological responses and Hg speciation in plant/ fungi-animal food chain. Lettuce (Lactuca sativa) and porcini mushrooms (Boletus edulis) were taken as model plant/ fungal species and Spanish slug (Arion vulgaris) as a model animal species. The plants, fed to the slugs, were grown in HgCl2 contaminated soil or soil from the vicinity of Hg mine in Idrija with traces of HgS and methyl Hg). Physiological parameters of plants and slugs were monitored during the experiment. At the end the biological material was frozen in LN2 and freeze dried. Hg L3-edge (12284 eV) XANES and EXAFS spectra of the biological samples and standards were measured at liquid helium temperature in fluorescence detection mode at the BM30B beamline of the ESRF synchrotron in Grenoble, using the 30-segment germanium solid state detector [1]. The results showed that addition of Se alleviated Hg toxic effects in the food chain started at HgCl2-contaminated soil, while for the soil from Idrija, containing low amounts of highly toxic methyl-Hg, the beneficial effect was less prominent [2]. No Hg-Se complexes were detected in plants, while in mushrooms and slugs the complexation was confirmed. Addition of Se to the plants, however, changed Hg ligand environment in plant tissues from sulphur to nitrogen ligands. Hg and Se both target the -SH functional groups in the plant tissues, so toxic effects of Hg are rather enhanced than alleviated by addition of Se. Nevertheless, the addition of Se to the plants is beneficial for higher trophic levels and lowers Hg toxicity for the primary consumers, the slugs.
Keywords: mercury, toxicity, ligand environment, XANES, EXAFS, food chain, plant, slug, fungi
Published in RUNG: 05.12.2022; Views: 1266; Downloads: 0
This document has many files! More...

2.
L'uso della tradizione : linee guida per la manutenzione degli edifici tradizionali tra Italia e Slovenia
2016, dictionary, encyclopaedia, lexicon, manual, atlas, map

Abstract: The publication is thinking about the importance of carrying out proper manintenance in traditional built heritage, with a focus on the border area between Italy and Slovenia
Keywords: traditional heritage, built environment, cultural landscape, preservation, maintenance, conservation
Published in RUNG: 22.06.2021; Views: 2169; Downloads: 0

3.
URBiNAT, Heritage and Circular Economy
Acri Marco, Dobričić Saša, unpublished conference contribution

Abstract: The presentation is showing the origin of the concept of the cultural corridor in Rijeka in the CLIC project as originated from the URBiNAT project
Keywords: Cultural Corridor, Healthy Corridor, Circular Eocnomy, Adaptive Reuse, Cultural Heritage, Historic Urban Landscape, Built Environment, urban regeneraiton, heritage conservation, heritage valorisaiton, Common Goods, Sustainable Heritage
Published in RUNG: 22.06.2021; Views: 2087; Downloads: 0
This document has many files! More...

4.
5.
6.
DISTRIBUTION OF ENTERIC VIRUSES IN THE GULF OF TRIESTE AND THEIR INTERACTIONS WITH ENVIRONMENTAL AND BIOLOGICAL PARAMETERS
José Manuel Carita Gonçalves, 2018, doctoral dissertation

Abstract: The available classical diagnostic methods, due to many disadvantages, do not allow effective detection of pathogenic enteric viruses in environmental samples. Due to low concentrations of pathogenic viruses in the sea, it is important to develop an effective concentration procedure for their successful detection. In the first part of the doctoral thesis, we focused primarily on the development of a protocol for an effective concentration of pathogenic enteric viruses in coastal water samples. Monolithic chromatographic columns (BIAseparations) were used for the concentration of rotaviruses and noroviruses, prior to the detection with reverse transcription quantitative PCR in real time (RT-qPCR). We tested the efficiency of concentration using columns of various chemical properties and selected pathogenic enteric viruses (rotavirus and norovirus). Among them, hydrophobic interaction monolithic column (CIM® C4) was the most effective. CIM C4 was used to optimize the concentration step and tested in waters with different salinities. The presence of concentrated viruses was confirmed by RT-qPCR and transmission electron microscope. We have developed a protocol that enables rapid concentration of viruses in coastal waters of various salinities and can be used on-site. The presence of RoV and NoV was surveyed, using the developed concentration protocol, prior to one-step RT-qPCR molecular detection, in the inner part of the Bay of Koper, in mussel farming areas and a swimming area. Rotaviruses, noroviruses and fecal indicator bacteria were frequently detected in the inner part of the Bay of Koper. Rotaviruses and noroviruses were detected in the studied area, with higher rates close to the outfall of the wastewater treatment plant in the estuary of river Rižana and were also detected in the middle of the Bay of Koper and in areas used for recreation and mussel farming. The results show that water bodies, which are otherwise defined as suitable for bathing or mussel farming, based on the results of fecal indicator bacteria, still contain low concentrations of pathogenic enteric viruses. In addition to human pathogenic enteric viruses and faecal coliforms, changes in abundance of bacteria and virus particles were studied in relation to temperature, salinity, inorganic and organic nutrient concentrations in the organically polluted Rižana estuary. Preliminary results showed spatially and seasonally changes in bacterial and viral particles abundance, and bacterial composition spatially and seasonally. However, seasonality plays a greater role in bacterial dynamics.
Keywords: Concentration of viruses, Enteric viruses, Rotavirus, Norovirus, Feacal coliforms, Feacal contamination, qPCR, RT-qPCR, Monolithic columns, Sewage, Seasonal dynamics, Concentration, Coastal environment, Gulf of Trieste
Published in RUNG: 02.07.2018; Views: 4768; Downloads: 211
.pdf Full text (1,95 MB)

7.
W OMEN W RITERS D ATABASE AND VIRTUAL RESEARCH ENVIRONMENT BEYOND THE CURRICULA OF LITERARY SCHOLARSHIP
Aleš Vaupotič, Narvika Bovcon, 2017, published scientific conference contribution abstract

Abstract: The study of informatics typically includes information visualization and the rhetoric of user interface. Such courses are expanding the core computer science curricula towards multimedia communication design. However, to practice visualization on datasets in a non-focused way may diminish the quality of educational effect as well as the quality of the results of students' projects. A collaboration with domain experts has proven to be very beneficial by involving students in various research projects and platforms. The students of informatics at the Faculty of Computer and Information Science, University of Ljubljana, have touched upon humanities projects in different special domains: the datasets provided by Institute of Contemporary History (INZ, Ljubljana), interface design for electronic scholarly editions based on TEI XML files, documentation of new media art exhibitions, and others. As noted by some contributors in A New Companion to Digital Humanities (2016) with relevance to the latter aspect of interdisciplinary contact, the domain of new media art constitutes an essential inspiration for the study of digital humanities methods and approaches. In the second part of the paper, the multi-year collaboration between the University of Nova Gorica and University of Ljubljana computer-science curricula will be presented. The WomenWriters database, as well as subsequently the NEWW VRE, has been used in different models of interdisciplinary collaboration.
Keywords: virtual research environment, WomenWriters database, interdisciplinary collaboration, digital humanities, information visualization
Published in RUNG: 05.03.2018; Views: 4053; Downloads: 0
This document has many files! More...

8.
Heavy metal analysis with in-situ prepared copper film electrode as a tool for environmental monitoring
Nana Ivana Hrastnik, 2017, master's thesis

Abstract: Monitoring and measuring heavy metals in the environment is of great importance and requires sensitive and reliable analytical techniques capable of detecting trace level concentrations. Nowadays, measurements of heavy metals are usually performed using sophisticated and expensive instrumental techniques, such as atomic absorption spectroscopy (AAS), atomic fluorescence spectroscopy (AFS), inductively coupled plasma mass spectrometry (ICP-MS), inductively coupled plasma optical emission spectroscopy (ICP-OES) etc. In this aspect, advanced electroanalytical (stripping) techniques represent a favourable alternative, facilitating sensitive and selective measurements of various analytes using relatively simple, portable and non-expensive instrumentation. This work is an investigation of novel copper-based electrodes for measuring trace levels of selected heavy metal ions, i.e. mercury(II), lead(II), tin(IV) and nickel(II). The methods of choice were anodic stripping voltammetry (ASV) in combination with the in-situ prepared copper film electrode (CuFE) for measuring low concentrations of mercury(II) and lead(II) (simultaneously) and tin(IV) in the test solutions and adsorptive cathodic stripping voltammetry (AdCSV) for determination of nickel(II). Metal-film electrodes are regularly employed in electrochemical stripping analysis due to their simple fabrication and surface regeneration. The newly developed CuFE appears to be a cheaper alternative to gold-based electrodes with several attractive electroanalytical characteristics, i.e. with low limits of detection (LOD), good repeatability and favourable linear response.
Keywords: Copper film electrode, anodic stripping voltammetry, adsorptive cathodic stripping voltammetry, heavy metals, environment.
Published in RUNG: 12.09.2017; Views: 4817; Downloads: 266
.pdf Full text (1,78 MB)

9.
Arbuscular mycorrhizal fungi alter Hg root uptake and ligand environment as studied by X-ray absorption fine structure
Alojz Kodre, Iztok Arčon, Marta Debeljak, Mateja Potisek, Matevž Likar, Katarina Vogel-Mikuš, 2017, original scientific article

Abstract: Mercury (Hg) – plant – fungal interactions are only poorly studied. Hg speciation and ligand environment in maize roots inoculated with arbuscular mycorrhizal (AM) fungi were investigated in order to better understand the role of AM in Hg soil to root transfer. The maize plants were grown in Hg polluted substrate (50 mg g1 as dissolved HgCl2) and inoculated with AM fungi originating from: a) highly Hg polluted environment of a former Hg smelting site in Idrija, Slovenia, (Glomus sp. – sample AmI), and b) non-polluted environment (commercial AM inoculum Symbivit1 – sample AmC). Hg speciation and ligand environment in maize roots was studied by Hg-L3 XANES and EXAFS with emphasis on XAS methodology – modelling and fitting the XAFS spectra to extract in a reliable way as much information on Hg coordination as possible. The AmI plants developed more arbuscules and less vesicles than the AmC plants, and also accumulated more Hg in the roots. A clear difference in Hg coordination between the AM (AmC & AmI) and the control (ConC & ConI) plants is recognized in Hg L3-edge EXAFS analysis: in the ConC & ConI maize roots 73–80% of Hg is attached between two sulphur atoms at the distance of 2.34 Å. The remaining ligand is nitrogen at 2.04 Å. In AmI & AmC roots another Hg-S attachment encompassing four thiol groups at the S-distance of 2.50 Å are identified, accounting for 21–26%. AM fungi can modify Hg ligand environment in plant roots, thus playing an important role in biogeochemical cycling of Hg in terrestrial ecosystems.
Keywords: EXAFS XANES Arbuscular mycorrhiza Phytoremediation Toxicity Hg coordination Ligand environment
Published in RUNG: 27.09.2016; Views: 6104; Downloads: 0
This document has many files! More...

Search done in 0.05 sec.
Back to top