1. Degradation of microplastics in the environment : dissertationVaibhav Budhiraja, 2024, doktorska disertacija Opis: Plastics are based on organic polymers that are sensitive to the environment in which they find themselves and will gradually decay through a variety of chemical reactions. This process is of great importance for the transformation and persistence of microplastics (MPs) that pollute the environment. The rate of degradation depends on two major factors: Firstly, the intrinsic properties of the polymers, such as chemical structure, molecular weight, crystallinity and the presence of additives, fillers or reinforcement and secondly, the environment to which they are exposed. The degradation rate of plastic will vary in different environmental matrices like soil, freshwater, seawater, wastewater, land etc., as well as in diverse environmental conditions like UV radiation, temperature, humidity, the effect of pollutants etc. Plastic mainly undergoes two fundamental reactions: oxidation and hydrolysis and the chemical structure of the polymer and its additives plays a key role in the degradation mechanism of plastic. Polyolefins having a carbon-only main chain are resistant to hydrolysis but susceptible to oxidation, whereas polyesters and polyamides containing heteroatoms are sensitive to hydrolysis and much more resistant to oxidation.
In the context of the present work, five different studies were done involving both naturally degraded plastic and accelerated weathering of plastics in the form of small particles, MPs. In the first study, natural degraded polyethylene (PE) and polypropylene (PP) samples with a life span of more than forty years were collected from the environment and their physiochemical properties were analysed. The results show that red coloured PE samples were more degraded as compared to blue coloured samples, indicating that pigment plays a key role in the degradation. The PP sample shows extreme surface degradation, leading to fragmentation and the generation of MPs. In the second study, the effect of hydrodynamic cavitation on MPs in waste water treatment plant sludge was evaluated. PE, PP, polyethylene terephthalate and polyamide were extracted from the sludge. It was found that hydrodynamic cavitation does not disintegrate the MPs, although it removes some toxic metals and shows cell disruption mechanisms.
Other studies were done with accelerated weathered MPs, which include PE, PP and tire wear particles (TWP), that were treated in accordance with an ISO 4892 standard weathering procedure that mimics natural weathered conditions. In the third study, we used weathered PE films to evaluate the synergistic adsorption behaviour of two pollutants, namely triclosan (TCS) and methylparaben (MeP). It was found that weathered MPs adsorb more pollutants and the adsorption behaviour of TCS is enhanced in the presence of MeP. In the fourth study, the magnetic extraction of pristine and weathered PE and TWP particles was performed. The results confirmed that the magnetic
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extraction of weathered MPs is difficult as compared to pristine MPs as their surface becomes more hydrophilic with weathering. In the fifth study, the effect of weathering on the density of PE and PP was evaluated. We found that weathering enhances the density of polyolefins, which is one of the main reasons for the observed sinking of polyolefin MPs in water. Ključne besede: accelerated weathering, aging, density, magnetic separation, pigment, plastic degradation, pollutants, polyethylene, polyolefin, polypropylene, sinking, tire wear particles, dissertations Objavljeno v RUNG: 04.06.2024; Ogledov: 1306; Prenosov: 0 Celotno besedilo (7,35 MB) |
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3. Pragmatic skills in aging : the case of ironyGreta Mazzaggio, Hortense De Bettignies, Diana Mazzarella, 2021, objavljeni povzetek znanstvenega prispevka na konferenci Opis: The use of non-literal language, like verbal irony, is deeply embedded in everyday communication and the ability to comprehend it changes across life. According to the echoic mention theory (Wilson & Sperber, 2012), understanding irony amounts to recognize a dissociative attitude. In the ‘Contextual echo’ example (Figure 1), Cynthia’s utterance “Tonight we gave a superb performance” is an example of irony. Cynthia is expressing a dissociative, mocking attitude towards the blatantly false proposition “Tonight we gave a superb performance”, that echoes the unfulfilled expectation that the concert would go well. The thought that is echoed can be “uttered”, like in the ‘Explicit echo’ example where the ironic utterance echoes the content explicitly expressed by Lea’s preceding statement; but the dissociative attitude can also target some implicitly communicated meaning, like in the ‘Implicated echo’ example, where the ironic utterance echoes the implicature of Lea’s statement, that is that they will sing well. Our first aim is to assess whether the echo’s degree of explicitness influence the processing of irony. Second, since research indicates that older adults sometimes struggle in understanding non-literal statements, like presupposition (Domaneschi & Di Paola 2019) or humor (Bischetti et al. 2019), we want to address the question of whether the processing of irony is more effortful in late adulthood and, if so, which underlying cognitive capacities might be responsible. Data collection is ongoing and the study is pre-registered on OSF (https://osf.io/94mys/?view_only=51fecb7acd694eca9b6b4d08cca02a26).
Methods: The experiment requires the participation of 25 young adults (18-29-year-old) and 25 older adults (65-74-year-old). Participants will be administered a series of standardized tests to assess a) ToM (Faux Pas test) b) WM (Alpha span test) c) Autistic Quotient. The experimental study is a self-paced reading task. Each participant will be presented with stories adapted from the material of Spotorno & Noveck (2014): 15 ironic stories (5 with contextual echo, 5 with implicated echo and 5 with explicit echo), 5 literal stories, 10 decoys and 20 fillers (in a randomized order). Participants answer a yes/no comprehension question at the end of each story. An example of stories is given in Figure 1.
Predictions: We expect overall slower reading time for ironic statements compared to literal ones and greater difficulties in the older adults group for ironic statements. We predict that our manipulation of the echo will have an effect on the processing of irony, and that reading times will be faster when the echo is explicit compared to when the echo is implicated (a stronger effect for older adults). We also expect that performance in our ToM task will predict reading times for ironic statements, with lower performance resulting in slower reading times. The presence of an implicated echo will exacerbate the difficulties. Moreover, we expect a positive correlation between the Autistic Quotient score and the difference between the reading times in the ironic and literal conditions. Finally, we expect that WM score will predict longer reading times for ironic statements when the implicitness of the echo poses higher cognitive demands.
Analysis plan: First, we plan an evaluation of the group differences for neuropsychological data using a Wilcoxon signed- rank test. Then, we will proceed with a Pearson correlation coefficient test and analysis of variance to understand the relationship between the different measures (Clark, et al. 2010). The principal component analysis will be used to further assess their relationship. To understand the effect of the predictors on the reading time we will run a (Generalized) Linear Mixed-Effects Model with reading time as response variable, (Age Group x Type x Echo) as categorical predictors, test scores of neuropsychological data as continuous (or ordinal) predictors, and subject ID and items as random effects. All relevant interactions (both fixed and random) will also be assessed. The models will be fitted in R using the ‘lme4’ package (Bates et al. 2015). The (G)LMM will be simplified by removing one non-significant interaction at a time (and then, possibly non-significant main effects) on the basis of the Analysis of Deviance (LR Tests), until the optimal model is reached. Ključne besede: irony, processing, aging Objavljeno v RUNG: 22.09.2021; Ogledov: 2879; Prenosov: 88 Povezava na celotno besedilo Gradivo ima več datotek! Več... |
4. Does irony understanding decline with age?Greta Mazzaggio, Hortense De Bettignies, Diana Mazzarella, 2021, objavljeni povzetek znanstvenega prispevka na konferenci Opis: The use of non-literal language is deeply embedded in everyday communication and the ability to comprehend it changes across life. Research indicates that older adults sometimes struggle in understanding pragmatic aspects of language, such as presupposition (Domaneschi & Di Paola 2019), humor (Bischetti et al. 2019) or sarcasm (Phillips et al. 2015). The present study aims at broadening our understanding of these age-related changes by focusing on irony understanding. To understand irony (e.g., ‘The weather is great!’ uttered under a pouring rain), one needs to recognize that the speaker is expressing a dissociative attitude towards a proposition that is blatantly irrelevant or false, which echoes an attributed thought or statement (e.g., the proposition ‘The weather is great’ attributed to the mistaken weather forecaster). Previous research shows that the ability to process irony is closely related to Theory-of-Mind (ToM) and working memory (WM). As there is evidence of an age-related decline in both cognitive abilities, this decline may impact irony understanding in late adulthood. In our ongoing study, we test the effect of age on irony-processing by comparing self-paced reading times of ironic and literal statements across two age groups (young adults: 19-25 yo and older adults: 65-74 yo). Crucially, we manipulate the degree of explicitness of the statement echoed by the ironic speaker. We predict that the difference between the reading times for ironic and literal statements will be modulated by age. Moreover, we predict that reading times will be faster when the echo is explicit compared to when the echo is implicated and that this effect will be stronger for older adults. Finally, we expect that ToM and WM will both be significant predictors and that WM will play a crucial role when the implicitness of the echo poses higher cognitive demands Ključne besede: irony, aging, cognitive decline, experimental pragmatics, processing Objavljeno v RUNG: 22.09.2021; Ogledov: 2525; Prenosov: 52 Povezava na celotno besedilo Gradivo ima več datotek! Več... |
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6. Cardiac stem cell aging and heart failureDaniela Cesselli, Aneta Aleksova, Elisa Mazzega, Angela Caragnano, Antonio Paolo Beltrami, 2017, pregledni znanstveni članek Opis: A side effect of the medical improvements of the last centuries is the progressive aging of the world population, which is estimated to reach the impressive number of 2 billion people with more than 65 years by 2050. As a consequence, age-related diseases, such as heart failure, will affect more and more patients in the next years. To understand the biological bases of these diseases will be a crucial task in order to find better treatments, and possibly slow age-related morbidity and mortality.
Cardiac stem cells have been at the center of a heated debate and their potential involvement in cardiac homeostasis has been questioned. In this review, we summarize evidence obtained by independent groups, on different animal models and humans, that strongly support the important role played by immature, cardiac resident cells in the cardioprotection against heart failure. Ključne besede: Aging, Heart failure, Cardiomyocyte turnover, Stem cells, Cell senescence, cKit, Sca1, PDGFRα, Cardiospheres Objavljeno v RUNG: 28.03.2017; Ogledov: 5541; Prenosov: 0 Gradivo ima več datotek! Več... |
7. Age-related effects on language production : A combined psycholinguistic and neurolinguistic perspectiveAndrea Marini, Sara Andreetta, 2016, samostojni znanstveni sestavek ali poglavje v monografski publikaciji Opis: This chapter focuses on the effects of aging on the process of language production from a psycholinguistic, and neurolinguistic perspective. The first section provides a detailed description of the language production system by outlining the notions of micro- and macrolinguistic processing and introducing to some of the most influential psycholinguistic models of message production. The second part focuses on psycholinguistic investigations assessing age-related variations in the ability to produce a verbal message. A conclusive section outlines the complex interplay between the neural changes induced by aging and the reorganization of the language production system. Ključne besede: aging, language, neurolinguistics, psycholinguistics Objavljeno v RUNG: 09.05.2016; Ogledov: 6044; Prenosov: 0 |