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682. A cross-sectional study of laboratory parameters 5–6 months after the first COVID-19 infectionTaja Zore, Jasna Lojk, Katarina Reberšek, Elizabeta Božnar Alič, Urška Čegovnik Primožič, Alenka France Štiglic, Aleš Jerin, Irena Prodan Žitnik, Helena Podgornik, Nada Snoj, Barbara Ostanek, Gabriele Turel, Tatjana Lejko-Zupanc, Janja Marc, Darko Černe, 2025, original scientific article Abstract: Objectives: Despite extensive study of COVID-19 disease, only a few studies also addressed the aftermath of the disease and potential long-term consequences. The aim of this study was to assess COVID-19 resolution through the cross-sectional analysis of an extensive range of haematological and biochemical laboratory parameters and to find potential markers still associated with disease severity 5-6-months post infection.
Methods: In this study, we analysed 92 routine biochemical, haematological and immunological parameters in 75 non-vaccinated patients 5–6 months after recorded first time SARS-CoV-2 infection without reinfection. Demographic and disease severity data were obtained through surveys.
Results: The majority of analysed parameters were within the normal reference intervals, however, statistically significant correlations with the disease severity were detected in 15 parameters: B lymphocytes, NK cells, interleukin (IL)-12, IL-1β, cortisol, ferritin, SARS-CoV-2 specific IgG and IgM antibodies, Na, Cl, creatinine, alkaline phosphatase, cholesterol, HbA1c and alpha 2 and beta 2 globulin fractions of the proteinogram.
Conclusions: Although most observed parameters returned to their normal reference intervals, significant correlations were still observed with disease severity, that could indicate either the pre-infection baseline state which affected disease outcome or minor remaining alterations in function of certain organs, pertaining their stress or damage during the acute phase of the disease.
Keywords: disease severity, laboratory parameters, resolution, COVID-19, SARS-CoV-2, laboratory diagnosis
Published in DiRROS: 07.11.2025; Views: 211; Downloads: 93
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683. A Sylvester equation approach for the computation of zero-group-velocity points in waveguidesBor Plestenjak, Daniel A. Kiefer, Hauke Gravenkamp, 2025, original scientific article Abstract: Eigenvalues of parameter-dependent quadratic eigenvalue problems form eigencurves. The critical points on these curves, where the derivative vanishes, are of practical interest. A particular example is found in the dispersion curves of elastic waveguides, where such points are called zero-group-velocity (ZGV) points. Recently, it was revealed that the problem of computing ZGV points can be modeled as a multiparameter eigenvalue problem (MEP), and several numerical methods were devised. Due to their complexity, these methods are feasible only for problems involving small matrices. In this paper, we improve the efficiency of these methods by exploiting the link to the Sylvester equation. This approach enables the computation of ZGV points for problems with much larger matrices, such as multi-layered plates and three-dimensional structures of complex cross-sections.
Keywords: parameter-dependent quadratic eigenvalue problem, eigencurves, zero-group-velocity point, Sylvester equation, method of fixed relative distance, two-parameter eigenvalue problem
Published in DiRROS: 07.11.2025; Views: 128; Downloads: 60
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684. The conjecture on distance-balancedness of generalized Petersen graphs holds when internal edges have jumps $3$ or $4$Gang Ma, JianFeng Wang, Sandi Klavžar, 2025, original scientific article Abstract: A connected graph $G$ with ${\rm diam}(G) \ge \ell$ is $\ell$-distance-balanced if $|W_{xy}|=|W_{yx}|$ for every $x,y\in V(G)$ with $d_{G}(x,y)=\ell$, where $W_{xy}$ is the set of vertices of $G$ that are closer to $x$ than to $y$. Miklavič and Šparl [Discrete Appl. Math. 244 (2018), 143--154] conjectured that if $n > n_k$ where where $n_k = 11$ if $k = 2$, $n_k = (k+1)^2$ if $k$ is odd, and $n_k = k(k +2)$ if $k \ge 4$ is even, then the generalized Petersen graph $GP(n,k)$ is not $\ell$-distance-balanced for any $1\le \ell<{\rm diam}(GP(n,k))$. In the seminal paper, the conjecture was verified for $k=2$. In this paper we prove that the conjecture holds for $k=3$ and for $k=4$.
Keywords: distance-balanced graph, $\ell$-distance-balanced graph, generalized Petersen graph, diameter
Published in DiRROS: 07.11.2025; Views: 172; Downloads: 91
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688. Sistem za ocenjevanje kakovosti izvedbe del v gozdovihDarja Stare, Matevž Triplat, Peter Smolnikar, Vasja Kavčič, Žiga Lukančič, Špela Ščap, Marjan Dolenšek, Jaša Saražin, Gašper Ogrin, Matjaž Dovečar, Nike Krajnc, 2025, not set Keywords: gozdarstvo, izvedba del, kakovost, merila in indikatorji, kontrolni vprašalnik
Published in DiRROS: 06.11.2025; Views: 220; Downloads: 76
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689. Odprta znanost : Mala Loža, Koper, od 29. julija do 18. avgusta 2025 in Gallusovo nabrežje, Ljubljana, od 28. avgusta do 6. oktobra 20252025, exhibition Keywords: odprta znanost, občanska znanost, raziskovalni podatki, podatkovni svetovalec, repozitoriji, projekt SPOZNAJ
Published in DiRROS: 06.11.2025; Views: 281; Downloads: 287
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