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{"title":"Microplastic contamination in surface water and sediments of Lake Canaçari, Central Amazon, during the dry season.","authors":"Gabriel Dos Anjos Guimarães, Rayane Vasconcelos da Fonseca, Beatriz Rocha de Moraes, Rômulo Augusto Ando, Isreele Jussara de Azevedo Rodrigues, Gustavo Frigi Perotti, Bruno Sampaio Sant'Anna, Gustavo Yomar Hattori","doi":"10.1007/s10661-026-16079-2","DOIUrl":"https://doi.org/10.1007/s10661-026-16079-2","url":null,"abstract":"<p><p>Contamination by microplastics is an emerging environmental problem that is widely distributed across continental aquatic environments and may cause ecological impacts. This study evaluated the occurrence, concentration, and chemical and morphological characteristics of microplastics in surface waters and sediments from Lake Canaçari, comparing two areas with different land-use patterns within a floodplain system in the Central Amazon. Microplastics were detected in all sampled areas. In surface water, concentrations ranged from 0 (no microplastic particles detected in one sample) to 1,000 microplastics·m⁻³ (405 ± 298 microplastics·m⁻³), while in sediments, they ranged from 7 to 307 microplastics·kg⁻¹ (77 ± 104 microplastics·kg⁻¹). No significant differences in microplastic concentrations were observed between fishing and human-settlement areas. The particles were predominantly blue fibers (< 1,000 μm). Among the spectroscopically analyzed particles, polyethylene was the most frequently identified polymer, while copper phthalocyanine pigments, including Pigment Blue 15 and Pigment Green 7, were also detected by FTIR and/or Raman spectroscopy. Overall, the results suggest that Lake Canaçari may act as a transport pathway, redistribution zone, and retention compartment for microplastics; however, seasonal sampling is needed to confirm how these processes vary throughout the hydrological cycle. These results reinforce the role of Amazonian floodplain systems in the regional dynamics of microplastics and highlight the need for monitoring and management strategies that incorporate seasonal hydrological connectivity at the basin scale.</p>","PeriodicalId":544,"journal":{"name":"Environmental Monitoring and Assessment","volume":"198 11","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149223141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Operational comparability of ecological status assessment in Iberian transboundary rivers.","authors":"António Tovar Faro, João Manuel Oliveira, Gonçalo Duarte, Paulo Branco, Pedro Segurado, Teresa Ferreira","doi":"10.1007/s10661-026-16021-6","DOIUrl":"https://doi.org/10.1007/s10661-026-16021-6","url":null,"abstract":"<p><p>The European Union Water Framework Directive (WFD) requires member states to assess the ecological status of surface waters using biological quality elements (BQEs). Although the WFD includes intercalibration procedures to harmonise class boundaries, differences between national assessment systems may affect the comparability of ecological status classifications, particularly in transboundary rivers. This study evaluated the consistency of Portuguese and Spanish ecological status assessments in 32 water bodies across Iberian transboundary rivers in the Minho, Lima, Douro, Tagus and Guadiana basins, using data collected between 2019 and 2021. Comparisons included fish, macrophytes, benthic macroinvertebrates and diatoms. Biological assemblages, ecological quality ratios (EQRs) and ecological quality classifications were analysed. Results differed markedly among BQEs. Fish showed no significant differences in assemblage composition or EQR values between countries and a moderate positive correlation in ecological quality classifications. Macroinvertebrates displayed weak compositional separation, no differences in EQR values and a weak, nonsignificant positive correlation between countries. Macrophytes showed significant compositional differences despite similar EQR distributions and a weak, nonsignificant positive correlation in ecological quality classifications. Diatoms showed the strongest divergence, with clear assemblage separation, higher EQR values in Spain and a very weak, nonsignificant negative correlation between countries. Final ecological classifications also showed a weak, nonsignificant positive correlation between countries. These findings show that formal intercalibration alone does not guarantee operational comparability in shared river systems. Cross-border assessment consistency depends strongly on the BQEs considered and on methodological differences between national monitoring systems, highlighting the need for improved harmonisation of monitoring procedures and taxonomic practices.</p>","PeriodicalId":544,"journal":{"name":"Environmental Monitoring and Assessment","volume":"198 11","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149223044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Articles You Might Have Missed.","authors":"Abigail Olinde","doi":"10.1007/s13181-026-01162-4","DOIUrl":"https://doi.org/10.1007/s13181-026-01162-4","url":null,"abstract":"","PeriodicalId":16429,"journal":{"name":"Journal of Medical Toxicology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149224313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling of Controlled Omnidirectional Motion of a Spherical Robot with Electromagnetic Drive","authors":"Dmitry V. Balandin,&nbsp;Alexander M. Tuzikov,&nbsp;Ruslan S. Biryukov","doi":"10.1134/S1560354726050060","DOIUrl":"10.1134/S1560354726050060","url":null,"abstract":"<div><p>This paper extends the modeling and control of a spherical robot with electromagnetic drive (SRED) from planar to fully three-dimensional motion on uneven surfaces. The robot consists of two concentric spherical shells: an outer shell carrying permanent magnets (PMs) and an inner shell with solenoid-type electromagnets (EMs); rolling is produced by the controlled electromagnetic interaction between the two magnet arrays. To enable omnidirectional rolling, the magnet placement is generalized to vertex-transitive polyhedra with cubic or icosahedral symmetry, which preserves the scalarity of the inertia tensors and allows the existing optimal control framework to be applied without modification. Within this class, <span>(M=60)</span> PMs on a rhombicosidodecahedron and <span>(S=24)</span> EMs on a truncated octahedron are selected; numerical evaluation over <span>(10^{4})</span> relative orientations confirms that a nonzero torque can be generated about an arbitrary axis. The drive model is reformulated as a three-dimensional torque map matrix, and coil currents and terminal voltages are recovered from a reference torque via the generalized-<span>(H_{2})</span> optimal controller, a Tikhonov-regularized pseudoinverse, and Kirchhoff’s circuit equations with back-EMF terms. Simulations of straight-line rolling, lateral-offset correction, and three-dimensional path tracking on a Gaussian bell-shaped surface confirm convergence of the tracking error to zero, with currents and voltages within the range of standard low-voltage motor drivers.</p></div>","PeriodicalId":752,"journal":{"name":"Regular and Chaotic Dynamics","volume":"31 Editors:","pages":"751 - 777"},"PeriodicalIF":0.8,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149214510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Neural Network Approach for Generating Libration Point Orbits","authors":"Lev Pyatko,&nbsp;Sergey Aksenov","doi":"10.1134/S1560354726050072","DOIUrl":"10.1134/S1560354726050072","url":null,"abstract":"<div><p>In the circular restricted three-body problem, families of periodic and quasi-periodic orbits exist in the vicinity of the libration points and are of significant interest for practical applications. This work presents a neural network-based algorithm for orbit construction and station-keeping, applicable to both periodic and quasi-periodic orbits near collinear libration points. The method employs a fully connected neural network trained on labeled trajectory data and iteratively refined using trajectories generated during previous stages of the algorithm. The proposed approach was applied to orbit generation near the Sun-Earth L1 libration point and demonstrated the ability to generalize to a broader class of trajectories than those included in the training set.</p></div>","PeriodicalId":752,"journal":{"name":"Regular and Chaotic Dynamics","volume":"31 Editors:","pages":"794 - 813"},"PeriodicalIF":0.8,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149214581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flame Spread and Group-Combustion Excitation in Randomly Distributed Droplet Clouds with Low-Volatility Fuel Near the Excitation Limit: A Percolation Approach Considering the Effect of Droplet Interaction on the Flame-Spread Limit","authors":"Yuka Hara,&nbsp;Masato Mikami","doi":"10.1007/s12217-026-10296-7","DOIUrl":"10.1007/s12217-026-10296-7","url":null,"abstract":"<div><p>Our study employs a percolation approach to describe flame spread and group-combustion excitation in randomly distributed fuel-droplet clouds based on findings obtained from space-based microgravity experiments on the flame-spread limit around interactive droplets. We developed a percolation model in which the flame spreads to droplets existing within the flame-spread-limit distance, which varies depending on the relative positions of two or three flame-spreading droplets. Using 2D- and 3D-percolation models, we investigated the effects of two-droplet and/or three-droplet interaction on the flame spread of randomly distributed droplet clouds and group-combustion excitation. The results show that the critical mean droplet spacing, around which the occurrence probability of group combustion sharply decreases as mean droplet spacing increases, increases with two-droplet interaction both in the 2D- and 3D-percolation models. However, even when three-droplet interaction is taken into account in the 2D-percolation model, the critical mean droplet spacing does not increase to the same extent as it does under two-droplet interaction. The critical mean droplet spacing in the 3D-percolation model is larger than that in the 2D-percolation model. The proportion of droplets ignited solely by droplet interaction relative to the total number of droplets is higher in the 3D-percolation model than in the 2D-percolation model because the increase in dimensionality leads to an increase in the number of droplets ignited solely by droplet interaction.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149214595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nucleon Clustering Modeling in Heavy Nuclei Fission Considering the Coulomb Interaction","authors":"Y. V. Ivanskiy,&nbsp;A. V. Unzhakova","doi":"10.1134/S1062873826702072","DOIUrl":"10.1134/S1062873826702072","url":null,"abstract":"<p>Experimental and theoretical studies have shown that it is the clustering mechanism that underlies the formation of various fission modes of heavy nuclei. A novel uniform approach to study different types of collective motion such as nucleon aggregation and adiabatic evolution of clusters is suggested. The developed algorithm is aimed at achieving distributed consensus in a homogeneous multiagent system through local interactions determined by the nearest neighbor rule. Numerical simulations were performed for several double magic nuclei considering the Coulomb interaction effect.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"90 10","pages":"1957 - 1963"},"PeriodicalIF":0.48,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149219456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction to: Engineering a Gd2(WO4)3-P@rGO heterostructure for enhanced electrochemical sensing and therapeutic drug monitoring of erdafitinib.","authors":"Rasha M K Mohamed, Rania H Taha, Ibrahim Hotan Alsohaimi, Khulaif Alshammari, Hassan M A Hassan, Hossieny Ibrahim, Mohamed M El-Wekil","doi":"10.1007/s00604-026-08455-z","DOIUrl":"https://doi.org/10.1007/s00604-026-08455-z","url":null,"abstract":"","PeriodicalId":705,"journal":{"name":"Microchimica Acta","volume":"193 11","pages":""},"PeriodicalIF":5.4,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149223006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of the EXFOR-Editor Software Package for Input of Nuclear Reaction Data into the EXFOR Library","authors":"G. N. Pikulina,&nbsp;S. M. Taova","doi":"10.1134/S1062873826702035","DOIUrl":"10.1134/S1062873826702035","url":null,"abstract":"<p>Compiling experimental data on nuclear reactions for the EXFOR International Library is a priority for the Center of Nuclear Physics Data at the All-Russian Research Institute of Experimental Physics. For this purpose, the EXFOR-Editor software package was developed. A description of the package is given. A new data processing mode—the creation of a Trans exchange file for transfer to the EXFOR library—is presented.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"90 10","pages":"1932 - 1938"},"PeriodicalIF":0.48,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149219491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physiological assessment of metal accumulation and multi-biomarker stress responses in wild and farmed Cirrhinus mrigala.","authors":"Sehrish Ijaz, Sana Ullah, Federica Impellitteri, Caterina Faggio","doi":"10.1007/s10661-026-16076-5","DOIUrl":"https://doi.org/10.1007/s10661-026-16076-5","url":null,"abstract":"<p><p>Increasing metal contamination in aquatic ecosystems threatens environmental sustainability, aquatic organisms, and public health by promoting the accumulation of toxic elements in fish tissues. This study evaluated the bioaccumulation of toxic metals and essential elements in the liver, gills, and muscles of wild and farm-reared Cirrhinus mrigala collected from the River Jhelum and local fish farms, respectively. Fish health was assessed through hematological, biochemical, and histopathological analyses. Results showed higher metal concentrations in wild fish compared with farm-reared specimens. The liver exhibited highest accumulation, followed by the gills and muscles. Among essential elements, calcium (Ca) and magnesium (Mg) were the most abundant, whereas nickel (Ni), chromium (Cr), and arsenic (As) were the predominant toxic metals. Wild fish exhibited marked hematological and biochemical alterations, while histopathological analyses revealed severe tissue damage in the gills, liver, and muscles. Human health risk assessment indicated minimal risk from farm-reared fish consumption, whereas wild fish from the River Jhelum may pose significant health concerns. Overall, the study highlights the ecological deterioration of the investigated river system and emphasizes the urgent need for effective mitigation strategies, including improved waste management practices, continuous environmental monitoring, and regular limnological assessments to safeguard aquatic ecosystems and public health.</p>","PeriodicalId":544,"journal":{"name":"Environmental Monitoring and Assessment","volume":"198 11","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149223039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}