Emission line taxonomy and the nature of AGN-looking galaxies in the SDSS

Massive spectroscopic surveys like the SDSS have revolutionized the way we study AGN and their relations to the galaxies they live in. A first step in any such study is to define samples of different types of AGN on the basis of emission line ratios. This deceivingly simple step involves decisions on which classification scheme to use and data quality censorship. Galaxies with weak emission lines are often left aside or dealt with separately because one cannot fully classify them onto the standard Star-Forming, Seyfert of LINER categories. This contribution summarizes alternative classification schemes which include this very numerous population. We then study how star-formation histories and physical properties of the hosts vary from class to class, and present compelling evidence that the emission lines in the majority of LINER-like systems in the SDSS are not powered by black-hole accretion. The data are fully consistent with them being galaxies whose old stars provide all the ionizing power needed to explain their line ratios and luminosities. Such retired galaxies deserve a place in the emission line taxonomy.Comment: 8 pages, 4 figures, Proceedings of IAU Symposium 267, Co-Evolution of Central Black Holes and Galaxie

Impact of ocean warming on sustainable fisheries management informs the Ecosystem Approach to Fisheries

Acknowledgements Serpetti N., Heymans J.J., and Burrows M.T. were funded by the Natural Environment Research Council and Department for Environment, Food and Rural Affairs under the Marine Ecosystems Research Programme (MERP) (grant No. NE/L003279/1). Baudron A. and Fernandes, P.G. were founded by Horizon 2020 European research projects MareFrame (grant No. 613571) and ClimeFish (grant No. 677039). Payne, B.L. was founded by the Natural Environment Research Council and Department for Environment under the ‘Velocity of Climate Change’ (grant No. NE/J024082/1).Peer reviewedPublisher PD

A lightweight group-key management protocol for secure ad-hoc-network routing

AbstractSecure routing protocols for ad hoc networks use group keys for authenticating control messages without high energy consumption. A distributed and robust group-key management is, thus, essential. This paper proposes and specifies a protocol for distributing and managing group keys in ad hoc environments based on the Secure Optimized Link State Routing protocol (SOLSR). The proposed protocol manages group keys taking into consideration frequent network partitions/mergers and also reduces the impact of non-authorized users that try to illegitimately obtain the group key to use network resources. The analysis shows that our proposal provides high availability and presents low energy consumption for the two most important group events in ad hoc network: joining-node events and network-partition-merging events. Our protocol reduces both the number of control messages and the energy spent with cryptographic operations by up to three orders of magnitude when compared to contributory group-key agreement algorithms. The proposed protocol provides an efficient key management in a timely manner

Uncária tomentosa e a lesão renal aguda isquêmica em ratos

O objetivo deste estudo foi avaliar o efeito renoprotetor do fitoterápico Uncaria tomentosa sobre a lesão renal aguda isquêmica induzida pelo clampeamento dos pedículos renais de ratos. A hipóxia e a hipoperfusão geradas com a isquemia intensificam a produção de espécies reativas já presentes no processo inflamatório. Os resultados mostraram que a função renal avaliada pelo clearance de creatinina, a excreção de peróxidos urinários (FOX) e a excreção urinária de malondealdeído (TBARS) desses animais apresentou renoproteção induzida pela UT, provavelmente relacionada às suas atividades antioxidantes.The objective of this study was to evaluate the renoprotective effects of Uncaria Tomentosa (cat's claw) on ischemic acute kidney injury induced by renal clamping in rats. The hypoxia and hypoperfusion increase the production of reactive species already present in the inflammatory process. Results showed that the renal function evaluated by creatinine clearance, the urinary excretion of peroxides and malondealdehyde indexes demonstrated that UT induced renoprotection, probably related to its antioxidant activities.El objetivo de este estudio fue evaluar el efecto rinoprotector del fitoterápico Uncaria tormentosa sobre la lesión renal aguda isquémica inducida por el clampeo de los pedículos renales de ratones. La hipoxia y la hipoperfusión generadas con la isquemia intensifican la producción de especies reactivas ya presentes en el proceso inflamatorio. Los resultados mostraron que la función renal evaluada por el clearance de creatinina, la excreción de peróxidos urinarios (FOX) y la excreción urinaria de malondialdehido (TBARS) de esos animales demostró rinoprotección inducida por la UT, probablemente relacionada con sus propiedades antioxidantes

Parques nacionais no Brasil e Canadá: comparação da gestão de resíduos sólidos gerados pelo turismo

This research shows that the effects of tourism in National Parks have positive and negative points, therefore, it aims to compare the management of solid waste generated by tourism between Brazil and Canada and, as specific objectives: a) Identify Public Policies Solid Waste in Protected Areas of each country studied; b) Identify in the studied Parks the factors that influence the generation of Solid Waste from tourism and c) Raise the potential and threats in the management of Solid Waste generated by tourism in National Parks with a focus on two Brazilian parks and two Canadian parks. Using SWOT, the waste management of the four National Parks was compared, based on documental research and a defined semi-structured interview. Qualitatively, the differences by location, structure and resources originated from exploratory and descriptive research. To create special standards, we work with the proportionalities between Parks and the influencing factors of waste generation. The results also revealed that despite the difference in laws between Brazil and Canada, there are problems in both countries, as well as solutions in both that can be structured and implemented between National Parks to improve solid waste management.Esta pesquisa mostra que os efeitos do turismo em Parques Nacionais têm pontos positivos e negativos, diante disso, tem como objetivo comparar entre o Brasil e o Canadá a gestão de resíduos sólidos gerados pelo turismo e, como objetivos específicos: a) Identificar as Políticas Públicas de Resíduos Sólidos em Áreas Protegidas de cada país estudado; b) Identificar nos Parques estudados os fatores que influenciam na geração de Resíduos Sólidos do turismo e c) Levantar as potencialidades e ameaças na gestão de Resíduos Sólidos gerados pelo turismo em Parques Nacionais com foco em dois parques brasileiros e dois parques canadenses. Usando a SWOT, comparou-se as gestões de resíduos dos quatro Parques Nacionais, com base em pesquisa documental e entrevista semiestruturada definida. Qualitativamente, as diferenças por localização, estrutura e recursos, originaram-se de pesquisas exploratórias e descritivas. Para criar padrões especiais, trabalhamos com as proporcionalidades entre os Parques e os fatores influenciadores da geração de resíduos. Os resultados revelaram também que apesar da diferença nas Leis entre Brasil e Canadá, existem problemas nos dois países, bem como soluções em ambos que podem ser estruturadas e implementadas entre os Parques Nacionais para melhorar a gestão dos resíduos sólidos

Da exclusão dos direitos políticos à conquista da cidadania - Brasil 1964 - 1987

Durante o regime militar, o poder Legislativo, especialmente o Congresso Nacional, sofreu mudanças significativas em suas funções. Sendo suprimida sua prerrogativa de legislar, no período de 64/68, tornase fiscalizador dos atos do Executivo, função que após a decretação do AI 5 também fica impedido de exercer. Após 1969, o Legislativo passa a existir apenas para justificar os atos do Executivo. Nesse processo de exclusão dos direitos políticos, a construção da cidadania se dá por meio dos movimentos sociais, nos quais os setores populares lutam por constituir-se como sujeito sócio-político

Biosurfactants produced by yeasts: fermentation, screening, recovery, purification, characterization, and applications

The demand for biosurfactants (BS) produced by yeast for use in industrial processes and products is increasing. Therefore, there has been an increase in the number of publications related to characterization of surfactant compounds produced by yeasts generally recognized as safe (GRAS), which has enabled their application in several industries, including the pharmaceutical and food industries. However, some of these studies use techniques that are not accurate or are no longer essential because of advancements in new technologies. Given the industrial importance of yeasts and their potential to produce BS, this study reviews the production of BS by this microorganism and the most recent industrial applications of BS. It also critically reviews a wide range of techniques used in screening of BS-producing strains, as well as those used in recovery, purification, and characterization of these surfactant compounds produced by yeasts. This review introduces diverse methodologies that are indispensable for the study of BS produced by yeast in an effort to advance BS design, synthesis, and application and introduces new perspectives in the research of these compounds to overcome the obstacles present in this field.This research was supported by Brazilian agencies Conselho Nacional de Desenvolvimento Científico e Tecnológico do Brasil (CNPq) [grant numbers 312336/2014-4, 423095/2016-1], Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) [grant number CAG-APQ-03478-16], and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) [PNPD20131289]