Iskanje po repozitoriju

Opis: We continue the study of (tw, ω)‐bounded graph classes, that is, hereditary graph classes in which large treewidth is witnessed by the presence of a large clique, and the relation of this property to boundedness of the tree‐independence number, a graph parameter introduced independently by Yolov in 2018 and by Dallard, Milanič, and Štorgel in 2024. Dallard et al. showed that bounded tree‐independence number is sufficient for (tw, ω)‐boundedness, and conjectured that the converse holds. While this conjecture has been recently disproved, it is still interesting to determine classes where the conjecture holds; for example, the conjecture is still open for graph classes excluding an induced star, as well as for finitely many forbidden induced subgraphs. In this paper, we identify further families of graph classes where (tw, ω)‐boundedness is equivalent to bounded tree‐independence number. We settle a number of cases of finitely many forbidden induced subgraphs, obtain several equivalent characterizations of (tw, ω)-boundedness in subclasses of the class of complements of line graphs, and give a short proof of a recent result of Ahn, Gollin, Huynh, and Kwon [SODA 2025] establishing bounded tree-independence number for graphs excluding a fixed induced star and a fixed number of independent cycles.
Ključne besede: clique number, hereditary graph class, line graph, tree‐independence number, treewidth
Objavljeno v RUP: 09.04.2026; Ogledov: 191; Prenosov: 9
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Opis: Wildlife monitoring is crucial for successful conservation and management of wildlife populations. To support modern wildlife monitoring approaches in Slovenia, we developed SRNA, a nationwide citizen science appli- cation that collects additional metadata on several terrestrial vertebrate species. The app is designed for two groups of citizen scientists, hunters and other nature observers. To foster learning, it features a photo-based wildlife identification quiz and species identification guides. This pilot study evaluated app use and data quality with two aims: (1) to assess users’ ability to identify wildlife species from photos, focusing on taxa expected to be challenging to identify, and to test whether identification accuracy varies across mammal groups; (2) to analyse wildlife observation data submitted through SRNA. Users were successful in identifying several distinctive species but had some difficulty distinguishing between certain mustelids, and between golden jackal and grey wolf, indicating priorities for targeted educational campaigns. Biology-related educational background facilitated identification of mustelids and, to a lesser extent, canids. In its first year, SRNA collected 1633 observations via 742 reports, predominantly of European roe deer. Hunters and nature observers contributed complementary data: differences were observed not only in the number of reported species and amount of data they provided, but also in reporting patterns across biogeo- graphic regions, reporting rates, and the average delay time between encounters and submissions. This study demonstrates that SRNA provides promising complementary data for wildlife monitoring, but also highlights data quality limitations (biases and verification issues) that must be taken into account when using SRNA data.
Ključne besede: application for wildlife monitoring, citizen science, mammals, Slovenia, SRNA app, Wildlife identification quiz
Objavljeno v RUP: 08.04.2026; Ogledov: 169; Prenosov: 11
Celotno besedilo (7,25 MB)
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Opis: This article provides a comprehensive guide for the processing and mounting of phlebotomine sand fly specimens, which is crucial for species identification and pathogen detection and isolation. It discusses a range of techniques suitable for both field and laboratory settings. The guide includes detailed instructions on sand fly collec- tion, handling, covering, and euthanasia (recommending dry freezing or CO2 over chemicals) as well as conservation strategies, such as cold storage and preservation in ethanol. The quality of preparation of certain anatomical structures (genital organs, head and wings) is essential for their proper microscopic observation and is described in this work. The article also presents detailed sample processing, including the clearing process with agents such as potassium hydrox- ide then Marc-André solution. The mounting process compares different media, emphasizing their optical properties and preservation potential. Hoyer fluid (also known as chloral gum) is recommended for quick observation, particularly for spermathecae, due to its clarity, although it is not suitable for long-term storage. Other media discussed include polyvinyl alcohol, EuparalÒ (for limited water tolerance), and Canada balsam (a hydrocarbon-soluble medium), with the latter two offering long-term preservation capabilities. Innovative molecular biology approaches such as DNA sequencing and MALDI-ToF, which require particular attention to sample processing, are also addressed. Furthermore, short video clips illustrating various mounting techniques as well as translations in many different languages are provided, allowing the guideline to reach the diverse needs and expectations of the global scientific community.
Ključne besede: mounting, Phlebotomine sand fly, Hoyer fluid, Marc-André solution, Chloral gum, Polyvinyl alcohol, Euparal®, Canada balsam, Leishmania isolation, field conditions, culture, dissection, molecular biology, MALDI-ToF, type-specimens
Objavljeno v RUP: 03.04.2026; Ogledov: 198; Prenosov: 6
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Objavljeno v RUP: 03.04.2026; Ogledov: 127; Prenosov: 6
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Ključne besede: dark events, dark tourism, social interaction, situated action, ethnomethodology, methodology
Objavljeno v RUP: 02.04.2026; Ogledov: 204; Prenosov: 3
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