Repozitorij Univerze v Novi Gorici

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1.
Vprašanje o koronavirusu
Tina Škorjanc, radijski ali tv dogodek

Ključne besede: PCR test, koronavirus, Covid-19
Objavljeno: 20.10.2020; Ogledov: 17; Prenosov: 0
.pdf Polno besedilo (76,47 KB)

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Temporal and spatial patterns of zinc and iron accumulation during barley (Hordeum vulgare L.) grain development. Journal of agricultural and food chemistry.
Amelie Detterbeck, Paula Pongrac, Daniel Persson, Iztok Arčon, Primož Pelicon, Primož Vaupetič, Mitja Kelemen, Søren Husted, Katarina Vogel-Mikuš, Stephan Clemens, Jan Kofod Shjoerring, 2020, izvirni znanstveni članek

Opis: Breeding and engineering of biofortified crops will benefit from a better understanding of bottlenecks controlling micronutrient loading within the seeds. However, few studies have addressed the changes in micronutrient concentrations, localization, and speciation occurring over time. Therefore, we studied spatial patterns of zinc and iron accumulation during grain development in two barley lines with contrasting grain zinc concentrations. Microparticle-induced-X-ray emission and laser ablationinductively coupled plasma mass spectrometry were used to determine tissue-specific accumulation of zinc, iron, phosphorus, and sulfur. Differences in zinc accumulation between the lines were most evident in the endosperm and aleurone. A gradual decrease in zinc concentrations from the aleurone to the underlying endosperm was observed, while iron and phosphorus concentrations decreased sharply. Iron co-localized with phosphorus in the aleurone, whereas zinc co-localized with sulfur in the sub-aleurone. We hypothesize that differences in grain zinc are largely explained by the endosperm storage capacity. Engineering attempts should be targeted accordingly.
Ključne besede: barley (Hordeum vulgare L.), biofortification, grain development, grain loading, LA-ICP-MS, μ-PIXE
Objavljeno: 20.10.2020; Ogledov: 19; Prenosov: 0
.pdf Polno besedilo (4,76 MB)

4.
MAST, master modul in art, science and technology
Peter Purg, Lange Teena

Opis: podMAST is a series of open conversations among relevant voices from the crossings of Art, Science and Technology. Springing from an apparent need for (archiving and reflecting) in-depth knowledge about this timely crossover, it shall remain publicaly accessible to incite dialog with other interested practitioners and thinkers. Also it is to serve as study material for the newly developed international Master Module in Art, Science and Technology (MAST) of the project www.mastmodule.eu.
Ključne besede: Art, Science, Technology, discussion, conversation, podcast, practitioner, theory, practie, critical
Objavljeno: 20.10.2020; Ogledov: 26; Prenosov: 0
.pdf Polno besedilo (113,85 KB)

5.
Podobe znanja
Nina Slaček, Iztok Arčon, radijska ali televizijska oddaja

Opis: Razvoj novih materialov, nanotehnologije, molekularne biologije in še številnih drugih področij sodobnih znanosti je tesno povezan s podrobnim razumevanjem tega, kaj se dejansko dogaja na molekularnem oziroma atomskem nivoju. Za razvoj denimo novih nanostrukturnih materialov za baterije prihodnosti je nujno videti, kaj se v njih dejansko dogaja med samim delovanjem. To omogoča rentgenska absorpcijska spektroskopija s sinhrotronsko svetlobo. »Ko z rentgenskim žarkom posvetimo na snov, iz atoma izbijemo elektron in ta odleti v okolico, se od nje odbija in nam na ta način sporoči, kaj se v njegovi okolici nahaja,« razlaga osnovni princip te metode prof. dr. Iztok Arčon. Na ta način je mogoče pridobiti številne ključne podatke, ki pogosto na glavo postavijo predhodne domneve raziskovalcev. A za takšne raziskave je nujen sinhrotron. Tovrstnih pospeševalnikov ni veliko in merilni čas na sinhrotronu je potrebno pridobiti z vrhunsko zastavljenimi raziskavami. A tokratni gost Podob znanja, dr. Iztok Arčon, redni profesor na Univerzi v Novi Gorici, ima po zaslugi svojega znanstvenega dela na tem področju na široko odprta vrata, sodeluje pa raziskovalnimi skupinami z zelo različnih področij. Letos je za svoje dosežke prejel tudi Preglovo nagrado. Foto: iz osebnega arhiva Iztoka Arčona
Ključne besede: rentgenska absorpcijska spektroskopija, sinhrotronsko sevanje, raziskave nanomaterialov, Preglova nagrada 2020
Objavljeno: 19.10.2020; Ogledov: 24; Prenosov: 0
.pdf Polno besedilo (160,86 KB)

6.
Ko šteje vsaka beseda
Andreja Gomboc, 2020, poljudni članek

Ključne besede: astronomija, Nobelova nagrada, črne luknje, Venera
Objavljeno: 17.10.2020; Ogledov: 30; Prenosov: 0
.pdf Polno besedilo (2,76 MB)

7.
X-ray absorption spectroscopy analysis: in situ, operando, in vivo
Iztok Arčon, 2020, objavljeni povzetek znanstvenega prispevka na konferenci (vabljeno predavanje)

Opis: X-ray absorption spectroscopy (XAS) is a powerful tool for characterisation of local structure and chemical state of selected elements in different new functional materials and biological or environmental samples. The XAS spectroscopy is based on extremely bright synchrotron radiation X-rays sources, which allow precise characterisation of bulk, nanostructured or highly diluted samples. With its two methods (XANES and EXAFS) it enables monitoring changes in valence states and local structures of constituent elements during chemical reactions under controlled reaction conditions, and it offers a possibility of a combination of X-ray spectroscopy and microscopy with sub-micron lateral resolution, crucial for analysis of biological samples on sub-cellular level. In this talk some typical examples of advanced XAS analysis will be presented.
Ključne besede: X-ray absorption spectroscopy, EXAFS, XANES, in-situ, operando
Objavljeno: 17.10.2020; Ogledov: 30; Prenosov: 0
.pdf Polno besedilo (68,21 KB)

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Spectroscopic insights into the electrochemical mechanism of rechargeable calcium/sulfur batteries
Giuliana Aquilanti, Jan Bitenc, Romain Berthelot, Antonio Scafuri, Alen Vižintin, Klemen Pirnat, Lorenzo Stievano, Robert Dominko, Iztok Arčon, Rémi Dedryvère, Dominique Foix, 13, izvirni znanstveni članek

Opis: Calcium batteries represent a promising alternative to lithium metal systems. The combination of the low redox potential and low cost and the energy-dense calcium anode (2073 mAh/cm3, similar to 2044 mAh/cm3 for Li) with appropriate low-cost cathode materials such as sulfur could produce a game-changing technology in several fields of applications. In this work, we present the reversible activity of a proof-of-concept Ca/S battery at room temperature, characterized by a surprising medium-term cycling stability with low polarization, promoted by the use of a simple positive electrode made of sulfur supported on an activated carbon cloth scaffold, and a state-of-the-art fluorinated alkoxyborate-based electrolyte. Insights into the electrochemical mechanism governing the chemistry of the Ca/S system were obtained for the first time by combining X-ray photoelectron spectroscopy and X-ray absorption spectroscopy. The mechanism implies the formation of different types of soluble polysulfide species during both charge and discharge at room temperature, and the formation of solid CaS at the end of discharge. The reversible electrochemical activity is proven by the reformation of elemental sulfur at the end of the following charge. These promising results open the way to the comprehension of emerging Ca/S systems, which may represent a valid alternative to Mg/S and Li/S batteries.
Ključne besede: Calcium/Sulfur Batteries EXAFS, XANES
Objavljeno: 17.10.2020; Ogledov: 39; Prenosov: 0
.pdf Polno besedilo (3,74 MB)

10.
Can we explain strict ordering restrictions with extralinguistic properties?
Franc Marušič, Petra Mišmaš, Rok Žaucer, Luka Komidar, Gregor Sočan, prispevek na konferenci brez natisa

Opis: Cartographic approach to syntax models strict universal word orders with a universal hierarchy of functional projections. For example, universal order of adjectives [Adjs] (cf. Hetzron 1978, Sproat & Shih 1991, etc.), supposedly comes from a universal hierarchy of FPs which host specific types of Adjs (Scott 2002). Adopting this as a premise, we explore the origin of this hierarchy, i.e., the origin of the specific ordering of individual FPs in the functional hierarchy and thus the origin in which Adjs end up being linearized.
Ključne besede: adjectives, cartography, universal hierarchy of functional projections, general cognition, experimental syntax, cognitive foundations of syntax
Objavljeno: 16.10.2020; Ogledov: 36; Prenosov: 0
.pdf Polno besedilo (131,64 KB)

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