1. The effect of supplementing pig diet with chestnut wood extract or hops on fresh meat and dry-cured productsUrška Tomažin, Martin Škrlep, Maja Prevolnik Povše, Nina Batorek Lukač, Danijel Karolyi, Matjaž Červek, Marjeta Čandek-Potokar, 2020, izvirni znanstveni članek Opis: Oxidation is one of the major reasons for impaired quality of meat and meat products but can be prevented by the addition of antioxidants. In the present study, the effect of dietary sweet chestnut wood extract and hop cones on the quality and oxidative stability of meat and dry-cured products was investigated. Control pigs (N = 11) were fed a commercial diet (13.1 MJ metabolizable energy, 15.5% crude protein), while the other two experimental groups were supplemented with 3% of sweet chestnut wood extract (Tannin; N = 12) or 0.4% of hop cones (Hops; N = 11). The quality of meat and dry-cured products was evaluated by means of chemical composition, water holding capacity, objective color, and lipid and protein oxidation. No major effects of sweet chestnut wood extract or of hops supplementation were observed, nevertheless, some indications of improved water holding capacity could be attributed to antioxidants supplementation. The color evolution of dry-cured bellies from Tannin and Hops groups of pigs during refrigerated storage was also indicative of an improved oxidative stability.
Ključne besede: pig meat, meat quality, pig diet, tannin extract, hops, dry-cured products, oxidation, pigs
Objavljeno v DKUM: 23.12.2024; Ogledov: 0; Prenosov: 2
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2. Pravna ureditev shranjevanja električne energije : magistrsko deloNina Rebol, 2024, magistrsko delo Opis: Zaradi vse večjega prodora proizvodnje električne energije iz obnovljivih virov, bodo prihodnji elektroenergetski sistemi potrebovali več prožnosti, stabilnosti in zanesljivosti, da bodo lahko ohranjali ravnovesje med proizvodnjo in porabo. Hitro uvajanje spremenljive proizvodnje električne energije iz obnovljivih virov, ki je trenutno v teku, bo svoj polni potencial doseglo šele z uvajanjem shranjevanja električne energije. Lastnost, da lahko električno energijo shrani in jo pozneje dovede v omrežje, ko in kjer je potrebna, je ključnega pomena in lahko pripomore k razogljičenju ter k večji energetski učinkovitosti in zanesljivosti oskrbe z električno energijo. Vendar pa so uvajanje tehnologij shranjevanja električne energije, poleg dosedanjih visokih stroškov tehnologij shranjevanja in nepripravljenosti nekaterih tehnologij shranjevanja, ovirale tudi regulativne in tržne ovire. Med pomembnejše ovire se štejejo predvsem neobstoj oz. pomanjkljiva pravna opredelitev shranjevanja električne energije, dvojno obdavčevanje in zaračunavanje omrežnin, omejitve pri dostopu in sodelovanju na veleprodajnih energetskih trgih in nejasnost glede možnosti lastništva objektov za shranjevanje električne energije s strani omrežnih operaterjev. V magistrskem delu so na kratko predstavljene tehnologije shranjevanja in različne storitve, ki jih lahko nudijo elektroenergetskemu sistemu. Poudarek je na analizi ovir ter ključnih pravnih aktov Evropske unije, ki urejajo shranjevanje električne energije. Prihodnost shranjevanja električne energije bo v veliki meri odvisna od prilagajanja obstoječe zakonodaje in razvoja novih regulativnih okvirjev, ki bodo spodbujali vključitev tehnologij shranjevanja v elektroenergetski sistem.
Ključne besede: energetski prehod, razogljičenje, obnovljivi viri energije (OVE), elektroenergetski sistem (EES), shranjevanje energije, regulativne ovire, prožnost, aktivni odjemalci, lastniška ločitev
Objavljeno v DKUM: 20.12.2024; Ogledov: 0; Prenosov: 17
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3. Razkritje in izkoriščanje potenciala v gig ekonomiji: perspektiva s strani podjetja ter svobodnjaka (freelancerja)Nina Zhang, 2024, diplomsko delo Opis: V diplomskem delu obravnavamo pomen in razsežnost gig ekonomije v Evropski uniji. Za lažje razumevanje delovanja podjetij in freelancerjev v EU na digitalnih platformah obravnavamo poleg gig ekonomije tudi platformno ekonomijo, ki prispeva h globljemu razumevanju freelancinga v sodobni digitalni dobi. Kvalitativna metoda raziskovanja omogoča vpogled v perspektivo podjetij in perspektivo freelancerjev v ekonomskem modelu gig ekonomije. Globinski intervjuji razkrivajo po eni strani dejavnike najemanja freelancerjev in po drugi strani dejavnike sprejemanja specifičnih opravil, nalog, gig del ali projektov. Skozi raziskavo smo ugotovili številne vrzeli, ki jih obravnavamo kot neizkoriščene potenciale v gig ekonomiji in nudijo priložnosti za izboljšave tega ekonomskega modela.
Ključne besede: razkritje potenciala, izkoriščanje potenciala, gig ekonomija, perspektiva podjetja, perspektiva svobodnjaka, freelancing.
Objavljeno v DKUM: 18.12.2024; Ogledov: 0; Prenosov: 15
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4. Effect of immunocastration and housing conditions on pig carcass and meat quality traitsMartin Škrlep, Klavdija Poklukar Žnidaršič, Kevin Kress, Milka Vrecl, Gregor Fazarinc, Nina Batorek Lukač, Ulrike Weiler, Volker Stefanski, Marjeta Čandek-Potokar, 2020, izvirni znanstveni članek Opis: The present study investigated the effects of immunocastration and housing conditions on carcass, meat, and fat quality traits. Immunocastrates (IC, n = 48), entire (EM, n = 48), and surgical castrates (SC, n = 48) male pigs were reared under three different housing conditions. The conditions were standard (n = 36), enriched (n = 36, twice as much space as standard and additional outdoor access), or standard with repeated social mixing (n = 72). Pigs of the IC group were vaccinated at the age of 12 and 22 wk. The animals were slaughtered in four batches, balanced for sex category and housing, at the age of 27 wk reaching 124.7 ± 1.0 kg. Immunocastration led to increased fat deposition (i.e., thicker subcutaneous fat at different anatomical locations, more leaf fat, fatter belly in IC than EM, P < 0.05) but did not affect muscularity traits. As a result, EM exhibited higher and SC lower (P < 0.05) carcass leanness than IC. Fatty acids composition of either subcutaneous or intramuscular fat (IMF) agreed with general adiposity, that is, IC were intermediate between EM and SC exhibiting the lowest and highest fat saturation (P < 0.05), respectively. Compared to SC, EM exhibited higher (P < 0.05) levels of muscle oxidation and collagen content than SC, with IC taking an intermediate position in the case of the level of peroxidation and collagen content, or closer to SC as regards to oxidation of muscle proteins (i.e., carbonyl groups). Meat quality (including marbling score, cooking loss, subjective color redness, and chroma) of IC was similar to EM, and both differed (P < 0.05) from SC. However, IC and SC had less (P < 0.05) tough meat than EM, consistent with protein oxidation. The effect of housing was less evident. Mixing of pigs resulted in lower (P < 0.05) carcass weight and fatness in all sex categories with lower (P < 0.05) oleic and higher (P < 0.05) arachidonic acid in IMF of EM.
Ključne besede: carcass traits, entire males, housing, immunocastrates, meat quality, surgical castrates
Objavljeno v DKUM: 18.12.2024; Ogledov: 0; Prenosov: 2
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5. A method for the immobilization of chitosan onto urinary cathetersAlenka Vesel, Nina Recek, Rok Zaplotnik, Albert Kurinčič, Katja Kuzmič, Lidija Fras Zemljič, 2022, izvirni znanstveni članek Opis: A method for the immobilization of an antibacterial chitosan coating to polymeric urinary medical catheters is presented. The method comprises a two-step plasma-treatment procedure, followed by the deposition of chitosan from the water solution. In the first plasma step, the urinary catheter is treated with vacuum-ultraviolet radiation to break bonds in the polymer surface film and create dangling bonds, which are occupied by hydrogen atoms. In the second plasma step, polymeric catheters are treated with atomic oxygen to form oxygen-containing surface functional groups acting as binding sites for chitosan. The presence of oxygen functional groups also causes a transformation of the hydrophobic polymer surface to hydrophilic, thus enabling uniform wetting and improved adsorption of the chitosan coating. The wettability was measured by the sessile-drop method, while the surface composition and structure were measured by X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy. Non-treated samples did not exhibit successful chitosan immobilization. The effect of plasma treatment on immobilization was explained by noncovalent interactions such as electrostatic interactions and hydrogen bonds.
Ključne besede: polymer, chitosan immobilization, adhesion, plasma-surface modification, biopolymers
Objavljeno v DKUM: 05.12.2024; Ogledov: 0; Prenosov: 2
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6. Urban hedges facilitate spontaneous woody plantsEva Horvat, Mirjana Šipek, Nina Šajna, 2024, izvirni znanstveni članek Opis: Most trees and other woody plants growing within urban areas are deliberately cultivated native or non-native plants. Opportunities for spontaneous establishment and spread of woody species are scarce in an urban environment, especially if the establishment begins from seeds. We hypothesized that urban hedges might offer safe sites for the spontaneous establishment of woody plants, which reach the hedges through propagule dispersal. We recorded the species composition of urban hedges in Maribor (NE Slovenia) in a gradient from the city centre outwards and evaluated the species' invasive potential and ecological requirements, along with hedge characteristics. Results show that hedges facilitated the survival and growth of 69 woody plants from 28 families. Among these, 62% were non-native and 10% were locally invasive. Most of recorded non-native woody plants were ornamentals. Moreover, for native species, we show that the stressful, warmer urban environment mostly facilitates the establishment of species in the genera Hedera and Acer. Comparison of non-native and native plants showed the former are more drought and heat tolerant than the latter. We further show that with distance from the city centre, the number of bird-dispersed species increases, in contrast to the wind-dispersed species. Additionally, our results suggest evergreen hedges may be less permeable to wind-dispersed propagules than deciduous hedges. Next, we stress the importance of paved surfaces and urbanization, selecting for the thermophile, drought tolerant, wind-dispersed woody plants that find refuge in urban hedges. Our results suggest urban hedges can facilitate the establishment of a wide range of woody plant species.
Ključne besede: biodiversity, green infrastructure, ornamental plants, species richness, urban ecosystem, vegetation
Objavljeno v DKUM: 03.12.2024; Ogledov: 0; Prenosov: 0
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7. Lowland forest fragment characteristics and anthropogenic disturbances determine alien plant species richness and compositionMirjana Šipek, Nina Šajna, 2024, izvirni znanstveni članek Opis: Loss of habitat and biological invasion are the main threats to biodiversity. In intensive agricultural or urban landscapes, forest fragments, even if they are small and isolated represent biodiversity refugia. Environmental variables such as landscape structure, abiotic conditions and anthropogenic disturbance affect the biodiversity of the fragments. In this study, we explored plant species richness in 48 forest fragments embedded in predominantly agricultural landscapes on the alluvial plains of the Mura and Drava rivers in NE Slovenia. We determined several forest fragment characteristics such as perimeter, area, shape complexity, length and proportion of edge shared with adjacent land-cover types and anthropogenic disturbance indicated by the presence of footpaths and waste disposed in fragments. The abiotic condition of these fragments was assessed by Ellenberg indicator values. We built generalized linear models and ordination analyses to assess the importance of environmental variables for the richness and composition of alien plant species and other ecologically meaningful plant groups. Shape complexity had a consistent positive effect on the richness of native and alien plants species. Major drivers of alien plant composition in forest fragments included adjacent land-cover and urbanization level. An increasing proportion of arable land along the forest fragment perimeter negatively affected the richness of alien plants, while the effect of urban areas was positive. Our results confirmed that forest fragments in the rural-urban matrix represent biodiversity refugia and support native plant species; however, they are not resistant to invasions; instead invasion depends on the land-cover type in the surroundings of a given forest fragment.
Ključne besede: agricultural land, urban area, settlements, fragment size, fragment shape complexity, ornamental plants
Objavljeno v DKUM: 29.11.2024; Ogledov: 0; Prenosov: 1
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8. Učinkovitost osnovnošolskega geografskega izobraževanja pri blaženju podnebnih sprememb in prilagajanju nanje : študija primeraNina Sekirnik, 2024, magistrsko delo Opis: Namen magistrskega dela je ugotoviti, kako izbrana skupina osnovnošolcev (študija primera) pozna podnebne spremembe, kako se nanje odziva na nivoju svojih vrednot in konkretnega delovanja ter kakšen vpliv ima na to geografsko izobraževanje. V teoretičnem delu smo s pomočjo analize izbranih strokovnih virov in literature opredelili vzroke za podnebne spremembe in njihove posledice ter pojasnili, kako jih lahko blažimo in se nanje prilagajamo. Zanimal nas je tudi pomen izobraževanja o podnebnih spremembah. Z vidika vključenosti navedenih vsebin v pouk geografije smo analizirali učni načrt za geografijo v osnovni šoli in izbrane učbenike. V empiričnem delu smo izvedli študijo primera, kjer smo preverili obstoječe stanje znanja, vrednot in ravnanja, povezanega s problematiko podnebnih sprememb. Zatem smo realizirali pedagoški eksperiment, v katerem smo glede na analizo rezultatov prvega anketiranja oblikovali učno pripravo ter učni proces izvedli z izbrano skupino učencev. Ponovno smo preverili iste kazalnike stanja. Identificirali smo, kako izbrane metode, oblike in vsebine izobraževanja, izvedenega v primeru pedagoškega eksperimenta, vplivajo na znanje, vrednote in ravnanje učencev. Glede na ugotovljeno zaključujemo, da je ciljno pripravljeno osnovnošolsko geografsko izobraževanje o podnebnih spremembah izrednega pomena ter učinkovito vpliva na znanje in vrednote učencev glede podnebnih sprememb, hkrati pa veča zavedanje o pomenu delovanja v smeri blaženja podnebnih sprememb in prilagajanja nanje.
Ključne besede: podnebne spremembe, segrevanje ozračja, izobraževanje, pouk geografije
Objavljeno v DKUM: 27.11.2024; Ogledov: 0; Prenosov: 10
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9. Starejše rokopisne pesmarice vzhodnoslovenskega prostora : Razstava v knjižnem razstavišču Univerzitetne knjižnice Maribor2024, katalog Opis: Današnji vzhodnoslovenski prostor zaje-ma geografsko območje vzhodne Štajerske med Dravo in Muro, kjer prebivalci govori-jo prleško in slovenskogoriško narečje, ter območje Prekmurja vse do današnje meje z Madžarsko. Ta prostor je bil v preteklosti del širšega jezikovnega in literarnega sistema, ki se je pričel oblikovati že v srednjem veku z ustanovitvijo vzhodnofrankovske mejne gro-fije Spodnje Panonije, ki je obsegala območje med rekama Donavo in porečjem Save. Prek-mursko ozemlje je že konec 11. stoletja preš-lo pod pravno oblast Ogrske, cerkvenouprav-no pa je bilo pridruženo zagrebški in györski škofiji (od 1777 sombotelski). Današnjemu slovenskemu prostoru se je priključilo šele po razpadu Avstro-Ogrske, leta 1919, z izjemo ozemlja ob zgornji Rabi in okolici Monoštra. Prekmurci so gojili svojo lastno književnost vse od 16. stoletja, nanjo pa so imele precej-šen vpliv kajkavska, gradiščanska in madžar-ska literarna tradicija. Knjižni jezik se je uve-ljavil v Küzmičevem prevodu Nove zaveze (1771), od polovice 19. stoletja pa so ga pre-kmurski pisci uveljavljali v vseh funkcijskih zvrsteh jezika. Prvi danes znani tiskani knji-gi prekmurskih Slovencev sta katekizem in abecednik (1715, 1725). Kljub temu pa obstoj številnih rokopisov, predvsem pesmaric, do-kazuje kontinuirano literarno ustvarjanje Prekmurcev vsaj od 16. stoletja pa do prve svetovne vojne, ko so tudi protestantski pisci sprejeli skupno slovensko knjižno normo.
Objavljeno v DKUM: 22.11.2024; Ogledov: 0; Prenosov: 8
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10. Kakovost življenja žensk po vulvektomijiNina Gajser, 2024, diplomsko delo Opis: Uvod: Vulvektomija je operativna odstranitev zunanjega ženskega spolovila, ki se pogosto uporablja pri zdravljenju raka zunanjega spolovila. Katera koli vrsta vulvektomije spremeni telesno podobo, izgled in funkcijo, kar za žensko predstavlja psihološki stres. Namen zaključnega dela je raziskati kakovost življenja žensk po vulvektomiji.
Metode: Izvedli smo pregled znanstvene literature. Iskanje literature je potekalo v tujih podatkovnih bazah: CHINAL, PubMed, Cochrane Library in ScienceDirect. Potek pregleda literature smo prikazali s pomočjo diagrama PRISMA, moč dokazov pa smo presojali s pomočjo hierarhije dokazov. Uporabili smo vsebinsko analizo podatkov in opisno metodo dela.
Rezultati: Skupno smo identificirali 160 rezultatov. V končno analizo pa smo vključili osem raziskav. Rezultati kažejo, da ima vulvektomija v večini negativen vpliv na kakovost življenja žensk.
Razprava in zaključek: Kakovost življenja žensk po vulvektomiji je večplastna ter zahteva celotni pristop k oskrbi. S pravilno podporo in vrsto posega je mogoče izboljšati nekatere vidike kakovosti življenja. Pomembno je, da se opravijo nadaljnje raziskave na to temo.
Ključne besede: vulvektomija, kakovost življenja
Objavljeno v DKUM: 23.10.2024; Ogledov: 0; Prenosov: 25
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