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Determinant variables on the isotopic values of particulate organic matter in a neotropical floodplain

Journal of Oceanology and Limnology 2024年第4期42卷 1173-1185页

作者： Vinícius de ANDRADE URBANO Matheus MAXIMILIAN RATZ SCOARIZE Gustavo HENRIQUE ZAIA ALVES driele delanira-santos Marcela da SILVA CAETANO Evanilde BENEDITO Departamento de Biologia(DBI) Laboratório de Ecologia EnergéticaUniversidade Estadual de Maringá(UEM)Maringá87020-900Brasil Programa de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais(PEA) Universidade Estadual de Maringá(UEM)Maringá87020-900Brasil Departamento de Biologia Geral Universidade Estadual de Ponta Grossa(UEPG)Campus UvaranasPonta Grossa 84030-900Brasil Australian Rivers Institute(ARI) Griffith UniversityNathan QLD 4111Australia

Particulate organic matter(POM)is an important energy source for aquatic consumers,understanding its origin and composition is essential for understanding the energetic dynamics of aquatic *** aim of this study was to analyze the relationship between POM and phytoplankton(isotopic values and chlorophyll concentration)and abiotic variables during dry and rainy *** was conducted in rivers and lagoons in the floodplain of the Upper Paraná*** found a greater difference in ^(δ13)C values of POM between sampling points than between seasons,indicating that the composition of regional sources influences the composition of POM more than dry and rainy *** addition,the concentration of chlorophyll during the dry season was positively correlated with ^(δ13)C values during that rainy ***,we found a relationship between factors limiting the growth of phytoplankton and ^(δ13)C values of POM,such as phosphate ions,indicating that variables that regulate phytoplankton growth tend to influence the composition of POM in river ***,maintaining the variables that regulate the phytoplankton community is of fundamental importance for the composition of POM,an important energy source in aquatic environments.

关键词： freshwater wetland stable isotopes food web subtropical environment

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Angle-tunable intersubband photoabsorption and enhanced photobleaching in twisted bilayer graphene

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Nano Research 2021年第8期14卷 2797-2804页

作者： Eva A.A.Pogna Xianchong Miao driele von Dreifus Thonimar V.Alencar Marcus V.O.Moutinho Pedro Venezuela Cristian Manzoni Minbiao Ji Giulio Cerullo Ana Maria de Paula Istituto di Nanoscienze CNR-NANO Laboratory NESTPiazza San Silvestro 12Pisa 56127Italy State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China Departamento de Fisica Institute de Ciencias ExatasUniversidade Federal de Minas GeraisBelo Horizonte-MG 31270-901Brazil Departamento de Fisica Institute de Ciencias Exatas e BiologicasUniversidade Federal de Ouro PretoOuro Preto-MG 35400-000Brazil Ndcleo Multidisciplinar de Pesquisas em Computagao-NUMPEX-COMP Campus Duque de CaxiasUniversidade Federal do Rio de JaneiroDuque de Caxias-RJ25265-970Brazil Institute de Fisica Universidade Federal FluminenseUFFNiteroi-RJ24210-346Brazil IFN-CNR Dipartimento di FisicaPolitecnico di MilanoPiazza L.da Vinci 32Milano 20133Italy

Van der Waals heterostructures obtained by artificially stacking two-dimensional crystals represent the frontier of material engineering,demonstrating properties superior to those of the starting *** control of the interlayer twist angle has opened new possibilities for tailoring the optoelectronic properties of these *** bilayer graphene with a strong interlayer coupling is a prototype of twisted heterostructure inheriting the intriguing electronic properties of *** the effects of the twist angle on its out-of-equilibrium optical properties is crucial for devising optoelectronic *** this aim,we here combine excitation-resolved hot photoluminescence with femtosecond transient absorption *** hot charge carrier distribution induced by photo-excitation results in peaked absorption bleaching and photo-induced absorption bands,both with pronounced twist angle *** simulations of the electronic band structure and of the joint density of states enable to assign these bands to the blocking of interband transitions at the van Hove singularities and to photo-activated intersubband *** tens of picoseconds relaxation dynamics of the observed bands is attributed to the angle-dependence of electron and phonon heat capacities of twisted bilayer graphene.

关键词： twisted bilayer graphene transient absorption microscopy hot-photoluminescence van der Waals heterostructures optoelectronic properties van Hove singularities

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Metabolomics in chronic hepatitis C:Decoding fibrosis grading and underlying pathways

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World Journal of Hepatology 2023年第11期15卷 1237-1249页

作者： Adriana Camargo Ferrasi Samara Vitória Granja Lima Aline Faria Galvani Jeany Delafiori Flavia Luísa Dias-Audibert Rodrigo Ramos Catharino Giovanni Faria Silva Roberta Rodrigues Praxedes driele Bretones santos Dayane Trevisan de Macedo Almeida Estela Oliveira Lima Department of Internal Medicine Sao Paulo State UniversityBotucatu 18618-686Brazil Innovare Biomarkers Laboratory University of CampinasCampinas 13083-877Brazil

BACKGROUND Chronic Hepatitis C(CHC)affects 71 million people globally and leads to liver issues such as fibrosis,cirrhosis,cancer,and death.A better understanding and prognosis of liver involvement are vital to reduce morbidity and *** accurate identification of the fibrosis stage is crucial for making treatment decisions and predicting *** used to grade fibrosis include histological analysis and imaging but have *** markers such as molecular biomarkers can offer valuable insights into *** To identify potential biomarkers that might stratify these lesions and add information about the molecular mechanisms involved in the *** Plasma samples were collected from 46 patients with hepatitis C and classified into fibrosis grades F1(n=13),F2(n=12),F3(n=6),and F4(n=15).To ensure that the identified biomarkers were exclusive to liver lesions(CHC fibrosis),healthy volunteer participants(n=50)were also *** untargeted metabolomic technique was used to analyze the plasma metabolites using mass spectrometry and database *** analyses were performed to identify differential biomarkers among *** Six differential metabolites were identified in each grade of *** six-metabolite profile was able to establish a clustering tendency in patients with the same grade of fibrosis;thus,they showed greater efficiency in discriminating *** This study suggests that some of the observed biomarkers,once validated,have the potential to be applied as prognostic ***,it suggests that liquid biopsy analyses of plasma metabolites are a good source of molecular biomarkers capable of stratifying patients with CHC according to fibrosis grade.

关键词： Chronic Hepatitis C Fibrosis Metabolome Biomarkers Plasma Liquid biopsy

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