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Povzetek: The present study represents the first research of morphological asymmetry in the eye lens diameter and three otolith features (otolith length, width, and weight) examined in the mullet species Chelon auratus collected from the Mediterranean coast and the Ain Ziana Lagoon, Libya. The asymmetry value for the eye lens diameter was the highest among the four morphological characters studied, and higher for the Ain Ziana Lagoon than for the Mediterranean coast of Libya. The study also showed that the asymmetry value increased with the fish’s total length. Plausible reasons for asymmetry in the four morphological traits examined are discussed in relation to the inconstancy in growth induced by ecological factors, including differences in water temperature, salinity, depth, and contaminants present in the marine waters of Libya and the Ain Ziana Lagoon.
Ključne besede: Chelon auratus, ecological factors, Mugilidae, pollution, otolith, morphology
Objavljeno v DiRROS: 06.07.2026; Ogledov: 155; Prenosov: 112
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Povzetek: Bodanella lauterborni W.M. Zimmermann and Heribaudiella fluviatilis (Areschoug) Svedelius are members of brown algae (Phaeophyceae) that exclusively inhabit freshwater habitats. Heribaudiella fluviatilis is the most frequently reported freshwater brown alga, widely distributed in the Northern Hemisphere. In contrast, B. lauterborni, one of the rarest algae globally, has been reported in only four glacial Alpine lakes and has not been observed in nature for nearly 50 years. Since 2019, the species has been considered locally extinct at its type locality, and its presence in the other three lakes is also questionable. Here, we report the occurrence of B. lauterborni in three springs on the Vlasina Plateau (Southeast Serbia), being the first finding of the species in Southeast Europe and the fifth discovery globally in environmental conditions not previously described for the species. We also provide detailed data on the morphology, ecology, and biogeography of B. lauterborni and H. fluviatilis. Additionally, we report the non-obligate association Hildenbrandio rivularis-Heribaudielletum fluviatilis discovered in two rivers. Our findings significantly expand the known ecological and geographical range of phaeophytes, highlighting Southeast Europe as a refugium for freshwater Phaeophyceae biodiversity.
Ključne besede: Phaeophyceae, spring, river, lake, crystalline shales, distribution, ecology, morphology, Hildenbrandio rivularis-Heribaudielletum fluviatilis
Objavljeno v DiRROS: 06.05.2026; Ogledov: 281; Prenosov: 228
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Povzetek: Multiphase flows are of great relevance to a wide range of industries, and their simulation using Computational Fluid Dynamics (CFD) is an important pillar for conducting design studies and gaining physical insight. However, a particular challenge in the simulation of multiphase flows is the occurrence of different morphologies or flow regimes, i.e. dispersed vs. segregated. The established simulation frameworks that have been developed over the years are usually only applicable to a specific morphology and level of detail. The simulation of a combination of morphologies is particularly challenging, and adaptive approaches are sought where the trade-off between level of detail and time to solution is mainly a matter of spatial resolution, rather than the fundamental choice of a method. In this respect, the Euler-Euler model has crucial properties that make it a good basis. This paper gives an overview of existing morphology-adaptive Eulerian methods, also often referred to as hybrid Eulerian methods. It is the result of a joint effort of the Dresden6 initiative, a loose association of research groups already active in this field. It gives an honest picture of current shortcomings and future development prospects. The aim of the work is to start a homogenization process by establishing a common terminology and listing suitable test cases that can be used for benchmarking, i.e. verification and validation.
Ključne besede: numerical simulations, multiphase flows, morphology-adaptive method, separated effect tests, integral tests
Objavljeno v DiRROS: 29.04.2026; Ogledov: 376; Prenosov: 299
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Ključne besede: review, classification, morphology, physiological characteristics, stability, genomic features, practical applications
Objavljeno v DiRROS: 09.03.2026; Ogledov: 402; Prenosov: 394
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Povzetek: Loparite is a natural perovskite (ABO3) with a complex composition, essentially a solid solution between loparite(-Ce) (Na0.5Ce0.5TiO3), lueshite (NaNbO3), and perovskite (CaTiO3), with small amounts of many other elements. The majority of reported loparite crystals are spinel-type interpenetration twins with compositional zoning. Associated with the high variability of compositions, different crystal structures of loparite were described, and the origin of twinning has not been addressed so far. In this work, we studied a loparite twin composed of two symmetrically intergrown cuboctahedra. Microprobe analyses revealed that the cubic and octahedral growth sectors have slightly different compositions. According to atomic-scale analyses, the cubic sectors with a lower Na:LREE ratio have a disordered orthorhombic structure, while the octahedral sectors with a higher Na:LREE ratio show partial ordering of Na and light rare-earth elements along A-type lattice planes in the [001] direction. The degree of ordering was evaluated by quantitative high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Atomic-scale analyses of (111) and {112} twin boundary (TB) contacts have shown that all TBs contain a 1–2 nm thin layer of an Si-rich amorphous phase. Our observations suggest that the loparite twin was established in the nucleation stage of crystallisation, followed by independent crystallisation of both twin domains from the melt. The initial crystal form was cubic; octahedral sectors evolved when the crystal size was still in the nanometre range, as a result of slow crystal growth. Differences in structural ordering between adjacent growth sectors developed during slow cooling due to the compositional variations. Our results imply that compositionally zoned crystals might show different structural ordering within single domains, which should be considered when interpreting bulk diffraction data of compositionally zoned perovskites.
Ključne besede: loparite, loparite twin, growth sectors, morphology
Objavljeno v DiRROS: 02.03.2026; Ogledov: 416; Prenosov: 325
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