1. Response of two different wheat varieties to glow and afterglow oxygen plasmaPia Starič, Silva Grobelnik Mlakar, Ita Junkar, 2021, izvirni znanstveni članek Opis: Cold plasma technology has received significant attention in agriculture due to its effect on the seeds and plants of important cultivars, such as wheat. Due to climate change, wherein increasing temperatures and droughts are frequent, it is important to consider novel approaches to agricultural production. As increased dormancy levels in wheat are correlated with high temperatures and drought, improving the germination and root growth of wheat seeds could offer new possibilities for seed sowing. The main objective of this study was to evaluate the influence of direct (glow) and indirect (afterglow) radio-frequency (RF) oxygen plasma treatments on the germination of two winter wheat varieties: Apache and Bezostaya 1. The influence of plasma treatment on seed surface morphology was studied using scanning electron microscopy, and it was observed that direct plasma treatment resulted in a high etching and nanostructuring of the seed surface. The effect of plasma treatment on germination was evaluated by measuring the germination rate, counting the number of roots and the length of the root system, and the fresh weight of seedlings. The results of this study indicate that the response of seeds to direct and indirect plasma treatment may be variety-dependent, as differences between the two wheat varieties were observed.
Ključne besede: cold plasma, nonthermal plasma, wheat, plants, afterglow plasma, glow plasma, SEM, roots, vigor, germination
Objavljeno v DKUM: 10.12.2024; Ogledov: 0; Prenosov: 2
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2. Cold agglutinins and cryoglobulins associate with clinical and laboratory parameters of cold urticariaMojca Bizjak, Mitja Košnik, Dorothea Terhorst, Dejan Dinevski, Marcus Maurer, 2021, izvirni znanstveni članek Opis: Mast cell-activating signals in cold urticaria are not yet well defined and are likely to be heterogeneous. Cold agglutinins and cryoglobulins have been described as factors possibly associated with cold urticaria, but their relevance has not been explained. We performed a single-center prospective cohort study of 35 cold urticaria patients. Cold agglutinin and cryoglobulin test results, demographics, detailed history data, cold stimulation test results, complete blood count values, C-reactive protein, total immunoglobulin E levels, and basal serum tryptase levels were analyzed. Forty six percent (n = 16) of 35 tested patients had a positive cold agglutinin test and 27% (n = 9) of 33 tested patients had a positive cryoglobulin test. Cold agglutinin positive patients, when compared to cold agglutinin negative ones, were mainly female (P = 0.030). No gender-association was found for cryoglobulins. A positive cold agglutinin test, but not a positive cryoglobulin test, was associated with a higher rate of reactions triggered by cold ambient air (P = 0.009) or immersion in cold water (P = 0.041), and aggravated by increased summer humidity (P = 0.007). Additionally, patients with a positive cold agglutinin test had a higher frequency of angioedema triggered by ingestion of cold foods or drinks (P = 0.043), and lower disease control based on Urticaria Control Test (P = 0.023). Cold agglutinin levels correlated with erythrocyte counts (r = -0.372, P = 0.028) and monocyte counts (r = -0.425, P = 0.011). Cryoglobulin concentrations correlated with basal serum tryptase levels (r = 0.733, P = 0.025) and cold urticaria duration (r = 0.683, P = 0.042). Results of our study suggest that cold agglutinins and cryoglobulins, in a subpopulation of cold urticaria patients, are linked to the course and possibly the pathogenesis of their disease.
Ključne besede: cold-induced urticaria, cold urticaria, cryoglobulins, cold agglutinin, degranulation, clinical parameters, laboratory parameters, mast cells, cold triggers
Objavljeno v DKUM: 07.08.2024; Ogledov: 104; Prenosov: 8
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3. Risk factors for systemic reactions in typical cold urticaria : results from the COLD-CE studyMitja Košnik, Dejan Dinevski, Simon Francis Thomsen, Daria Fomina, Elena Borzova, Kanokvalai Kulthanan, Raisa Meshkova, Dalia Melina Ahsan, Mona Al-Ahmad, Jovan Miljković, Dorothea Terhorst, 2022, izvirni znanstveni članek Opis: Background: Cold urticaria (ColdU), i.e. the occurrence of wheals or angioedema in response to cold exposure, is classified into typical and atypical forms. The diagnosis of typical ColdU relies on whealing in response to local cold stimulation testing (CST). It can also manifest with cold-induced anaphylaxis (ColdA). We aimed to determine risk factors for ColdA in typical ColdU.
Methods: An international, cross-sectional study COLD-CE was carried out at 32 urticaria centers of reference and excellence (UCAREs). Detailed history was taken and CST with an ice cube and/or TempTest® performed. ColdA was defined as an acute cold-induced involvement of the skin and/or visible mucosal tissue and at least one of: cardiovascular manifestations, difficulty breathing, or gastrointestinal symptoms.
Results: Of 551 ColdU patients, 75% (n=412) had a positive CST and ColdA occurred in 37% (n=151) of the latter. Cold-induced generalized wheals, angioedema, acral swelling, oropharyngeal/laryngeal symptoms, and itch of earlobes were identified as signs/symptoms of severe disease. ColdA was most commonly provoked by complete cold water immersion and ColdA caused by cold air was more common in countries with a warmer climate. Ten percent (n=40) of typical ColdU patients had a concomitant chronic spontaneous urticaria (CSU). They had a lower frequency of ColdA than those without CSU (4% vs 39%, p=0.003). We identified the following risk factors for cardiovascular manifestations: previous systemic reaction to a Hymenoptera sting, angioedema, oropharyngeal/laryngeal symptoms, and itchy earlobes.
Conclusion: ColdA is common in typical ColdU. High-risk patients require education about their condition and how to use an adrenaline autoinjector.
Ključne besede: adrenaline autoinjector, cold urticaria, COLD-CE, risk factors, systemic reactions, epinephrine, therapeutic use, self administration, injections, intramuscular, methods
Objavljeno v DKUM: 06.08.2024; Ogledov: 139; Prenosov: 8
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4. Methodology improvements to simulate performance and emissions of engine transient cycles from stationary operating modes: A case study applied to biofuelsFernando Cruz-Peragón, Eloisa Torres Jiménez, Luka Lešnik, Octavio Armas, 2022, izvirni znanstveni članek Opis: In the present study engine/vehicle responses from a standardized transient test cycle are estimated using 13 stationary operating regimes following a previously developed methodology. The main advantage of the methodology tested is that allows obtaining an estimation of transient parameters in a stationary test bench, which requirements are much less demanding than those of the transient test bench. The objectives are: in one hand, to demonstrate that the methodology correctly estimates engine responses regardless of the fuel tested, as it is proposed in a previous paper and, on the other hand, to improve the methodology and the accuracy of the estimated parameters. The fuels tested are renewable fuels from different raw materials (biodiesel from rapeseed, sunflower, and soybean), and diesel fuel as the reference. Biodiesels were tested neat and blended (30% v/v) with diesel fuel. The engine is a common-rail light-duty one, and the standardized testing procedure used to illustrate the implementation of the methodology is the New European Driving Cycle (NEDC). Two design of experiments (DoE) of 13 runs each were analyzed. One of the DoE tested was proposed for characterizing the NEDC, referred as to CTDoE design, while the other one is a five-level fractional factorial design (FFDoE) that adequately matches the optimality criteria of orthogonality, D-optimal criterion, rotatability, and space-filling. The original methodology was improved by the implementation of a new fitting function that simulates the cold start effect over the engine parameters and by an new definition of the boundary in the [n,M] domain. These improvements showed significantly higher accuracy of the estimated engine parameters obtained, both instantaneous and accumulated, respect to the original methodology. The results obtained based on the application of the FFDoE design support the feasibility of the methodology tested. Engine performance and regulated emissions responses, such as intake air and fuel mass flow rate, thermomechanical exergy rate, exhaust gas residual heat rate, total hydrocarbons (THC), nitrogen oxides (NOx), carbon monoxide (CO) and particulate matter (PM) emissions from a transient test were instantaneously and cumulatively predicted with high accuracy using the engine responses from 13 steady-state operating modes.
Ključne besede: simulation, light duty diesel engine, transient cycle, biodiesel, design of experiments, cold start correction function
Objavljeno v DKUM: 21.09.2023; Ogledov: 350; Prenosov: 30
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5. Adrenaline autoinjector is underprescribed in typical cold urticaria patientsMojca Bizjak, Mitja Košnik, Dejan Dinevski, Simon Francis Thomsen, Daria Fomina, Elena Borzova, Kanokvalai Kulthanan, Raisa Meshkova, Fernando Monteiro Aarestrup, Dalia Melina Ahsan, Dorothea Terhorst, Marcus Maurer, 2022, drugi znanstveni članki Ključne besede: cold urticaria, systemic reactions, adrenaline autoinjector, cold-induced anaphylaxis
Objavljeno v DKUM: 17.08.2023; Ogledov: 348; Prenosov: 35
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6. Urtikarija zaradi hlada - dejavniki tveganja za prizadetost dihal ali kardiovaskularnega sistemaMojca Bizjak, 2022, doktorska disertacija Opis: Urtikarijo zaradi hlada (UH), pri kateri se pojavijo s hladom izzvane urtike, angioedem ali oboje hkrati, delimo na tipično in atipično obliko. Diagnoza tipične UH temelji na pozitivnih lokalnih stimulacijskih testih (LST). Pri UH se lahko razvijejo tudi sistemske reakcije. Namen raziskave je bil določiti dejavnike tveganja za sistemske reakcije pri tipični UH. Mednarodna raziskava imenovana COLD-CE (tj. Urtikarija zaradi hlada in druge s hladom izzvane reakcije – celostno ovrednotenje) je potekala v 32 UCARE centrih (angl. Urticaria Center(s) of Reference and Excellence). Pridobili smo natančne anamnestične podatke in opravili LST s kocko ledu in/ali napravo TempTest®. Prizadetost dihal smo definirali kot dispnejo, piskanje ali stridor. Prizadetost kardiovaskularnega sistema smo definirali kot hipotenzijo ali izgubo zavesti in/ali druge simptome povezane s hipotenzijo (tj. omotica, občutek omedlevice ali nemoči). V raziskavo smo vključili 551 bolnikov z UH in 75 % od njih je imelo pozitivne LST (tj. tipično UH). Pri 40 bolnikih s tipično UH smo diagnosticirali tudi kronično spontano urtikarijo (KSU). Prizadetost dihal je nastopila pri 22 % in prizadetost kardiovaskularnega sistema pri 31 % bolnikov s tipično UH brez KSU. Ugotovili smo tri neodvisne dejavnike tveganja za prizadetost dihal: pričetek UH v otroštvu, orofaringealni in/ali laringealni simptomi ter srbež uhljev. Neodvisni dejavniki tveganja za prizadetost kardiovaskularnega sistema pa so: angioedem, orofaringealni in/ali laringealni simptomi, srbež uhljev ter predhodna sistemska reakcija na pik kožekrilca.
Ključne besede: COLD-CE, dejavniki tveganja, urtikarija zaradi hlada, sistemske reakcije
Objavljeno v DKUM: 29.11.2022; Ogledov: 564; Prenosov: 79
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7. Dependence of warm or cold feeling and heat retention ability of knitwear from digital print parametersMladen Stančić, Dragana Grujić, Dragoljub Novaković, Nemanja Kašiković, Branka Ružičić, Jelka Geršak, 2014, izvirni znanstveni članek Opis: Textile materials are increasingly being subjected to the process of printing. The printing process with its parameters significantly affects the properties of textile materials and clothes made from these materials. This paper examines the effect of the parameters of digital printing on thermo-physiological characteristics of printed textile materials. As the essential print parameters were selected tone value and a different number of passes. In this research were used knitted fabric materials of 100% cotton fibers (100% CO), 100% polyester fibers (100% PES) and their mixture (50%CO/50% PES). The influence of print parameters to thermo-physiological properties of the material is evaluated through a warm or cold feeling and heat retention ability. Results of the research demonstrated that, in addition to material composition, the printing process with its parameters have a significant influence on the thermo-physiological characteristics of textile materials.
Ključne besede: digital printing, textile materials, thermo-physiological comfort, warm of cold feeling, heat retention ability
Objavljeno v DKUM: 09.08.2017; Ogledov: 1412; Prenosov: 105
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9. Dependence of material characteristics on lubrication in bulk forming processLeo Gusel, 2009, objavljeni znanstveni prispevek na konferenci Opis: In the paper the influence of coefficient of friction (lubricant) on different properties of cold formed material has been examined. Tensile tests, hardness measurements and electrical conductivity measurements were performed.In the frame of the experimental work the process of cold forward extrusion of a cylinder made from copper alloy was investigated. The specimens were extruded at four different lubricants coefficients of friction. The results have shown that use of different lubricators with different coefficients of friction can have effects on the material properties during and after cold forming process.
Ključne besede: lubrication, cold forming, copper alloy, mechanical properties
Objavljeno v DKUM: 31.05.2012; Ogledov: 1706; Prenosov: 23
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