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Rigidity of terminal simplices in persistent homology
Aleksandra Franc, Žiga Virk, 2023, original scientific article

Abstract: Given a filtration function on a finite simplicial complex, stability theorem of persistent homology states that the corresponding barcode is continuous with respect to changes in the filtration function. However, due to the discrete setting of simplicial complexes, the simplices terminating matched bars cannot change continuously for arbitrary perturbations of filtration functions. In this paper we provide a sufficient condition for rigidity of a terminal simplex, i.e., a condition on $\varepsilon > 0$ implying that the terminal simplex of a homology class or a bar in persistent homology remains constant through $\varepsilon$-perturbations of filtration function. The condition for a homology class or a bar in dimension $n$ depends only on the barcodes in dimensions $n$ and $n+1$.
Keywords: persistent homology, stability theorem, terminal simplex, rigidity
Published in DiRROS: 15.03.2024; Views: 55; Downloads: 36
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7.
Development of the recycling procedure for rapid antigen tests
Rebeka Rudolf, Darja Feizpour, Žiga Jelen, Peter Majerič, Tilen Švarc, Matej Zadravec, Timi Gomboc, Aleksandra Kocijan, 2024, original scientific article

Keywords: rapid antigen tests, recycling, characterization, nanogold, plastic
Published in DiRROS: 28.02.2024; Views: 108; Downloads: 42
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8.
Subchronic exposure of rats to sublethal dose of microcystin-YR induces DNA damage in multiple organs
Metka Filipič, Bojana Žegura, Bojan Sedmak, Irena Horvat-Žnidaršič, Aleksandra Milutinović Živin, Dušan Šuput, 2007, original scientific article

Abstract: Background. Microcystins (MCs) are cyclic heptapeptides that are considered tobe liver specific toxins. They are potent tumour promoters and recent studies indicate that they are also genotoxic. In this study we measured DNA damage in lymphocytes, liver, kidney (cortex and medulla), lung, spleen and brain cells of male Fisher F344 rats that were exposed to sublethal dose (every second day 10 Ugžkg b.w.č i.p) of microeysrin-YR (MCYR) for one month. Methods. At the end of exposure the animals were sacrificed, the lymphocytes were isolated from blood taken from jugular vein, liver cells were obtained byperfusion with collagenase A and the cells from other organs were isolated by incubating small tissue pieces with eollagenase A. The DNA damage in isolated cells was measured with the single cells gel electrophoresis (SCGE) also called the comet assay. Results. A significant increase of the % tail DNAin MCYR-exposed animals compared to the nonexposed control ones was observed in brain (2.5 fold), liver (2.1 fold), kidney medulla (1.9 fold), kidney cortex (1.8 fold) and lung (1.7 fold) cells, while the DNA from lymphocytes and spleen cells was not affected. Conclusion. This study demonstrated that subehronic exposure to sublethal doses of MCs can induce systemicgenotoxicity in mammals, and it affects not only the liver but also other vital organs.
Keywords: DNA damage, comet assay, cyanobacteria, bacterial toxins, rats, inbred F344
Published in DiRROS: 20.02.2024; Views: 105; Downloads: 28
.pdf Full text (142,90 KB)

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An outline of the history of radiotherapy at the Institute of oncology in Ljubljana from its beginning till 1980s
Aleksandra Oklješa Lukič, Karmen Hübscher, 2003, professional article

Abstract: Background. The article presents the milestone events in the history of radiotherapy at the lnstitute of Oncology since its establishment till 1980s. It reviews the facts deduced from various jubilee publications, seminar reports and staff interviews of the Institute of Oncology. The aim of the article is to present the chronological history of radiotherapy at the Institute of Oncology, and to supplement the fragmented and incomplete recordswritten in the past. Conclusions. Available records are occasionally discrepant, but the most significant events in the history of the Institute ofOncology and its Radiotherapy Ward can nevertheless be ascertained.
Published in DiRROS: 06.02.2024; Views: 99; Downloads: 23
.pdf Full text (212,78 KB)

10.
Material properties of high-strength high chromium TWIP steel with increased corrosion resistance
Pavel Podaný, Tomáš Studecký, Aleksandra Kocijan, 2023, original scientific article

Keywords: TWIP, steels, microstructure, mechanical properties, corrosion
Published in DiRROS: 02.02.2024; Views: 163; Downloads: 70
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