Iskanje po repozitoriju

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Povzetek: With their unique physicochemical properties, such as metallic-like conductivity, favorable (electro)catalytic properties, electrochemical stability, and ease of functionalization, pyrochlores have found applications in various fields such as solid oxide fuel cells, batteries, thick film resistors, and temperature sensors; however, there are no reports on their application in electrochemical immunosensing. In this study, we exploited the (electro)catalytic nature and stability of the pyrochlore Bi2Ru2O7 clusters silanized with (3-aminopropyl)triethoxysilane (APTES) to demonstrate their potential for the effective stacking of functional proteins. Characterization of the clusters by XPS disclosed a dual environment of Bi, also indicating the presence of Bi2O3 alongside APTES-Bi2Ru2O7 clusters and, importantly, the predominant involvement of pyrochlore moieties in subsequent protein stacking. After stacking protein A and antibodies, the immunosensor revealed a nearly interference-free operation, high sensitivity, a detection limit of 118 fM SARS-CoV-2 spike protein, and operation in a wide examined concentration range of 10−5−10−1 μg mL−1 with an r2 of 0.98. In combination with a short incubation time of 30 min, the pyrochlore-based immunosensor provides a solid platform for future point-of-need applications.
Ključne besede: Bi2Ru2O7 pyrochlore, APTES, SARS-CoV-2, spike protein, immunosensors, electrochemical
Objavljeno v DiRROS: 24.03.2025; Ogledov: 193; Prenosov: 103
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Ključne besede: varstvo gozdov, morfološke analize
Objavljeno v DiRROS: 21.03.2025; Ogledov: 148; Prenosov: 0
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Povzetek: For an arbitrary normed space ${\mathcal X}$ over a field ${\mathbb F} \in \{ {\mathbb R}, {\mathbb C} \}$, we define the directed graph $\Gamma({\mathcal X})$ induced by Birkhoff-James orthogonality on the projective space ${\mathbb P}({\mathcal X})$, and also its nonprojective counterpart $\Gamma_0({\mathcal X})$. We show that, in finite-dimensional normed spaces, $\Gamma({\mathcal X})$ carries all the information about the dimension, smooth points, and norm's maximal faces. It also allows to determine whether the norm is a supremum norm or not, and thus classifies finite-dimensional abelian $C^\ast$-algebras among other normed spaces. We further establish the necessary and sufficient conditions under which the graph $\Gamma_0(\mathcal{R})$ of a (real or complex) Radon plane ${\mathcal R}$ is isomorphic to the graph $\Gamma_0({\mathbb F}^2, \|\cdot\|_2)$ of the two-dimensional Hilbert space and construct examples of such nonsmooth Radon planes.
Ključne besede: normed spaces, Birkhoff-James orthogonality, orthodigraph, dimension, smoothness, rotundness, Radon plane
Objavljeno v DiRROS: 20.03.2025; Ogledov: 195; Prenosov: 230
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Objavljeno v DiRROS: 20.03.2025; Ogledov: 182; Prenosov: 202
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Povzetek: Peer victimization and anxiety are consistently positively correlated, though the longitudinal relationship remains inconsistent. Previous research often failed to ac count for the reciprocal relationship between traditional and cyber victimization, with limited evidence of the influence of broader societal factors. Thus, the present study aimed to longitudinally examine the relationship between victimization, cyber victimization, and anxiety within the specific context of the COVID-19 pandemic during one school year (2021/22), employing both the cross-lagged panel model and the random-intercept cross-lagged panel model. The study included 1766 stu dents (58.5% females; Mage= 15.33; SD = 1.20) from lower- and upper-secondary schools in Slovenia who participated in three time-points with approximately 8 weeks apart, with T1 occurring before school closures, T2 during school closures (which lasted 17–21 weeks), and T3 after school closures. Findings revealed that the relationship between anxiety and victimization changed across the school year. The results of the cross-lagged panel model indicated that traditional victimization in T1 positively predicted anxiety in T2, and anxiety in T2 positively predicted traditional victimization in T3. Cyber victimization at T2 predicted lower anxiety at T3. The results of the random-intercept cross-lagged panel model showed that t the within-person level, students experiencing more cyber victimization than ex pected reported greater subsequent victimization, especially after school closures. The study provides insights into the dynamics of the relationship between peer victimization and anxiety during a specific period of school closure. The findings do not fully align with any single theoretical model, highlighting the complexity of these interactions in the pandemic context. This study underscores the need to con sider broader socio-environmental factors in understanding the relationship between peer relationships and psychosocial outcomes.
Ključne besede: victimization, cyber victimization, enxiety, middle adolescents, longitudinal studies, school closure
Objavljeno v DiRROS: 20.03.2025; Ogledov: 181; Prenosov: 55
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