ESTUDO DE INDICADORES DE RISCOS AMBIENTAIS DA SUB- BACIA HIDROGRÁFICA DO RIBEIRÃO DO CARMO – PORTO NACIONAL(TO)

A pesquisa trata do estudo de indicadores de riscos ambientais da sub-bacia hidrográfica do ribeirão do Carmo, no município de Porto Nacional, estado do Tocantins/Brasil, visa caracterizar os aspectos físicos, através de parâmetros morfométricos (comprimento dos rios, índice de circularidade da bacia, hierarquização da drenagem, densidade de rios, densidade de drenagem, coeficiente de manutenção), e contribui para novos estudos que venham ao encontro de propostas de conservação dessa sub-bacia. Para sua concretização, obedeceu-se a uma metodologia de execução baseada em levantamento bibliográfico e cartográfico, seguido de trabalho de campo para reconhecimento da área e entrevista com os moradores de Porto Nacional, com vista à percepção dos mesmos sobre a instalação da UHE do Lajeado. O material cartográfico foi digitalizado e vetorizado para obtenção dos dados morfométricos, através de softwares específicos de geoprocessamento. Os resultados indicam que naturalmente, a sub-bacia do ribeirão do Carmo não apresenta riscos ambientais significativos. Entretanto, as atividades implementadas exercem expressivas modificações na mesma, que implicam em perdas no que se refere ao capital natural e moral(ético) e cultural. Palavras-chave: Bacia Hidrográfica. Risco Ambiental. Morfometria. Study of indicators of environmental risks of the hydrographic sub-basin of the Carmo Stream – Porto Nacional (TO) The research deals with the study of indicators of environmental risks of sub-basin of the stream of Carmo, in the city of Porto Nacional, Tocantins State / Brazil, to characterize the physical aspects, through morphometric parameters (the length of the rivers, the index of the basin circularity, hierarchy of drainage, the density of rivers, the coefficient of maintenance), and it contributes to new studies that meet the proposed conservation goals of this sub-basin. For its realization, it obeys an implementation methodology based on literature and mapping survey, followed by field work for recognition of the area and interviewing the residents of Porto Nacional, overlooking the perception about the installation of paved UHE. The map material was scanned and vectorized to obtain the morphometric data, using specific software of geoprocessing. The results indicate that, naturally, the sub-basin of the stream of Carmo does not present significant environmental risks. However, the activities implemented exert significant modifications to it, involving losses in relation to natural capital and moral (ethical) and cultural. Key words: Watershed. Environmental Risk. Morphometry

SARS-CoV-2 introductions and early dynamics of the epidemic in Portugal

Genomic surveillance of SARS-CoV-2 in Portugal was rapidly implemented by the National Institute of Health in the early stages of the COVID-19 epidemic, in collaboration with more than 50 laboratories distributed nationwide. Methods By applying recent phylodynamic models that allow integration of individual-based travel history, we reconstructed and characterized the spatio-temporal dynamics of SARSCoV-2 introductions and early dissemination in Portugal. Results We detected at least 277 independent SARS-CoV-2 introductions, mostly from European countries (namely the United Kingdom, Spain, France, Italy, and Switzerland), which were consistent with the countries with the highest connectivity with Portugal. Although most introductions were estimated to have occurred during early March 2020, it is likely that SARS-CoV-2 was silently circulating in Portugal throughout February, before the first cases were confirmed. Conclusions Here we conclude that the earlier implementation of measures could have minimized the number of introductions and subsequent virus expansion in Portugal. This study lays the foundation for genomic epidemiology of SARS-CoV-2 in Portugal, and highlights the need for systematic and geographically-representative genomic surveillance.We gratefully acknowledge to Sara Hill and Nuno Faria (University of Oxford) and Joshua Quick and Nick Loman (University of Birmingham) for kindly providing us with the initial sets of Artic Network primers for NGS; Rafael Mamede (MRamirez team, IMM, Lisbon) for developing and sharing a bioinformatics script for sequence curation (https://github.com/rfm-targa/BioinfUtils); Philippe Lemey (KU Leuven) for providing guidance on the implementation of the phylodynamic models; Joshua L. Cherry (National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health) for providing guidance with the subsampling strategies; and all authors, originating and submitting laboratories who have contributed genome data on GISAID (https://www.gisaid.org/) on which part of this research is based. The opinions expressed in this article are those of the authors and do not reflect the view of the National Institutes of Health, the Department of Health and Human Services, or the United States government. This study is co-funded by Fundação para a Ciência e Tecnologia and Agência de Investigação Clínica e Inovação Biomédica (234_596874175) on behalf of the Research 4 COVID-19 call. Some infrastructural resources used in this study come from the GenomePT project (POCI-01-0145-FEDER-022184), supported by COMPETE 2020 - Operational Programme for Competitiveness and Internationalisation (POCI), Lisboa Portugal Regional Operational Programme (Lisboa2020), Algarve Portugal Regional Operational Programme (CRESC Algarve2020), under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF), and by Fundação para a Ciência e a Tecnologia (FCT).info:eu-repo/semantics/publishedVersio

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements