31. VPLIV KOVINSKIH IONOV NA IZGUBO SADNE AROMATIKE MLADIH BELIH VINMatic Ferjančič, 2020, diplomsko delo Opis: Zaradi dejstva, da se kar nekaj slovenskih svežih belih vin že v kratkem obdobju po trgatvi sooča s posledicami netipičnega staranja (ATA), ki se kaže predvsem v hitri izgubi intenzivne sadne aromatike, smo se odločili, da bomo v diplomskem delu raziskali vzroke, ki pripeljejo do tega vedno bolj perečega problema. Ob preučevanju literature, povezane s to tematiko, smo naleteli na podatke, da bi lahko bila izguba intenzivne sadne aromatike (hidroliza estrov) povezana s povečanimi vsebnostmi kovinskih ionov v vinih. Poleg tega smo zasledili tudi raziskave, v katerih raziskovalci dokazujejo, da večja vsebnost antioksidantov v vinih pomaga zaščititi sadne estre. Da bi te informacije preverili, smo se odločili narediti poskus, v katerem smo v različnih obravnavanjih v vino sorte Sauvignon dodali realne količine kovinskih ionov in antioksidantov. Tako pripravljene vzorce smo nato pospešeno starali 50 dni pri 30 °C. Po koncu staranja smo estre iz vzorcev ekstrahirali z dietil etrom in te ekstrakte analizirali z uporabo plinskega kromatografa s plamenskim ionizacijskim detektorjem (GC-FID). Ugotovili smo, da kovinski ioni vplivajo na zmanjšanje količine estrov v izbranem vinu. Ravno tako smo ugotovili, da večja vsebnost antioksidantov v vinu, ki vsebuje več kovinskih ionov, pomaga zmanjšati hidrolizo estrov. Tekom izvedbe poskusa smo se soočili s kar nekaj ovirami in tako spoznali, da za pospešeno staranje vzorcev za analizo estrov ni primeren vsak material posodic. Pri stekleničkah smo opazili, da je med uporabo novega in opranega rabljenega stekla po 50-dnevnem staranju velika razlika v vsebnosti estrov v vzorcih. Možno je, da se med staranjem iz natrijevega borosilikatnega stekla v vino ekstrahirajo kovinski ioni, ki na tak način kontaminirajo vzorce. Pri polipropilenski (PP) embalaži pa smo opazili, da se med staranjem količina estrov v vzorcih zmanjša bolj kot v opranem rabljenem steklu. Vzrok za to je najverjetneje v adsorpciji estrov na stene PP posode.
Ključne besede: vino, estri, kovinski ioni, antioksidanti, ATA, plinski kromatograf s plamenskim ionizacijskim detektorjem, GC-FID, izguba sadne aromatike, vpliv materiala embalaže na hidrolizo estrov
Objavljeno v RUNG: 29.07.2020; Ogledov: 4201; Prenosov: 128
 Celotno besedilo (1,43 MB) |
32. Arabidopsis halleri shows hyperbioindicator behaviour for Pb and leaf Pb accumulation spatially separated from ZnStephan Höreth, Paula Pongrac, Marta Debeljak, Katarina Vogel-Mikuš, Matic Pečovnik, Primož Vavpetič, Iztok Arčon, izvirni znanstveni članek Opis: Lead (Pb) ranks among the most problematic environmental pollutants. Background contamination of soils is nearly ubiquitous, yet plant Pb accumulation is barely understood. In a survey covering 165 European populations of the metallophyte Arabidopsis halleri, several field samples had indicated Pb hyperaccumulation, offering a chance to dissect plant Pb accumulation.
Accumulation of Pb was analysed in A. halleri individuals from contrasting habitats under controlled conditions to rule out aerial deposition as a source of apparent Pb accumulation. Several elemental imaging techniques were employed to study the spatial distribution and ligand environment of Pb.
Regardless of genetic background, A. halleri individuals showed higher shoot Pb accumulation than A. thaliana. However, dose–response curves revealed indicator rather than hyperaccumulator behaviour. Xylem sap data and elemental imaging unequivocally demonstrated the in planta mobility of Pb. Highest Pb concentrations were found in epidermal and vascular tissues. Distribution of Pb was distinct from that of the hyperaccumulated metal zinc. Most Pb was bound by oxygen ligands in bidentate coordination.
A. halleri accumulates Pb whenever soil conditions render Pb phytoavailable. Considerable Pb accumulation under such circumstances, even in leaves of A. thaliana, strongly suggests that Pb can enter food webs and may pose a food safety risk.
Ključne besede: Pb accumulation, XANES, EXAFS, Arabidopsis halleri
Objavljeno v RUNG: 16.01.2020; Ogledov: 3068; Prenosov: 0
Gradivo ima več datotek! Več... |
33. |
34. |
35. |
36. The non-dominant hand perseveration and movement in SZJ locative constructionsMatic Pavlič, 2018, objavljeni znanstveni prispevek na konferenci Opis: In sign languages, signers habitually encode the relations between locative arguments with a complex predicate consisting of several independent morphemes, as shown by Pfau and Aboh (2012) for Sign Language of the Netherlands. In this study, I examine perseverations and movements of the non-dominant hand (H2) in Slovenian Sign Language (SZJ) locative constructions. In SZJ, the H2may be persevered after producing the two-handed Ground in locative constructions. This is shown by the data collected from seven first language SZJ informants, using a Picture Description Task. The referential location as well as the orientation and the handshape of this perseveration may change at the sign-boundary when the one-handed Figure has just been articulated and the one-handed predicate is about to be signed. Before this sign-boundary, the handshape of the persevered H2 refers to the Ground – and is therefore a Ground classifier. After that boundary, the handshape of the persevered H2 refers to the part of the Ground that is relevant for localizing the Figure – and is therefore an axial part classifier that projects aMeasure Phrase.
Ključne besede: locative construction, non-dominant hand perseveration, measure phrase, Slovenian Sign Language
Objavljeno v RUNG: 20.03.2018; Ogledov: 3952; Prenosov: 171
Celotno besedilo (1,37 MB) |
37. Children's early bilingualism and musical training influence prosodic discrimination of sentences in an unknown languageArthur Stepanov, Matic Pavlič, Penka Stateva, Anne Reboul, 2018, izvirni znanstveni članek Opis: This study investigated whether early bilingualism and early musical training positively influence the ability to discriminate between prosodic patterns corresponding to different syntactic structures in otherwise phonetically identical sentences in an unknown language. In a same-different discrimination task, participants (N = 108) divided into four groups (monolingual non-musicians, monolingual musicians, bilingual non-musicians, and bilingual musicians) listened to pairs of short sentences in a language unknown to them (French). In discriminating phonetically identical but prosodically different sentences, musicians, bilinguals, and bilingual musicians outperformed the controls. However, there was no interaction between bilingualism and musical training to suggest an additive effect. These results underscore the significant role of both types of experience in enhancing the listeners' sensitivity to prosodic information.
Ključne besede: prosody, bilingualism, same-different task, French, musical training, acoustics, brain
Objavljeno v RUNG: 10.01.2018; Ogledov: 4011; Prenosov: 0
Gradivo ima več datotek! Več... |
38. |
39. Classifier predicate as a small clause in Slovenian Sign LanguageMatic Pavlič, 2017, objavljeni povzetek znanstvenega prispevka na konferenci Opis: In Slovenian Sign Language (SZJ), classifier predicate cannot be negated and thus it does not qualify as the head of a verb phrase. Such a conclusion does not rule out the possibility that SZJ classifier predicate projects a reduced clausal structure. I analyze these SZJ classifier predicates as non-verbal predicates that form a small-clause structure assuming that classifier small clause is selected by an overt (HAVE) or a covert verbal head. This proposal explains the complexity of classifier predicates. Being a non-verbal projection, classifier predicate fails to move with a verbal V-to-T movement and stays in situ. For SVO languages such as SZJ, this analysis correctly predicts the change from the basic SVO to the non-basic SOV for transitive classifier predicates and from the basic SVOdOi to the non-basic SOdVOi for ditransitive classifier predicates.
Ključne besede: Slovenian Sign Language, classifier predicate, small clause, word order
Objavljeno v RUNG: 10.11.2017; Ogledov: 4448; Prenosov: 0
Gradivo ima več datotek! Več... |
40. |
