Is scanning under rubber dam isolation a feasible approach for the execution of indirect restorations? / O escaneamento sob isolamento absoluto é uma técnica viável para execução de restaurações indiretas?

Objective: The aim of the study was to report the aplicability of intraoral scanning while rubber dam isolation is in place. Material and Methods: Female patient, 50 years old, required restorative procedures on teeth 35 and 37. An intraoral scan was initially performed on both arches. Isolation was carried out from 33 to 37, tooth preparation and immediate dentin sealing were carried out. A new scan with the rubber dam in place was performed and a CAD/CAM lithium disilicate hybrid block was digitally designed, milled, crystallized and cemented under the tooth surface with the rubber dam still in position. After completing this stage, the rubber dam was removed, the occlusion was verified, presenting excellent aesthetic and functional results. Results: The absolute isolation process used in the present study works as an excellent device for gingival retraction. Conclusion: The absolute isolation can be recommended in clinical activities of intraoral scanning favoring the quality of the final result of treatments (AU)

Objetivo: O objetivo do estudo foi relatar a aplicabilidade do escaneamento intraoral sob isolamento absoluto. Material e Métodos: Paciente do sexo feminino, 50 anos, necessitou de procedimentos restauradores nos dentes 35 e 37. Uma varredura intraoral foi inicialmente realizada em ambos os arcos. O isolamento absoluto foi feito de 33 a 37, permitindo a realização do preparo dentário e selamento imediato da dentina. Um novo escaneamento com o dique de borracha colocado foi realizado e um bloco híbrido de dissilicato de lítio CAD/CAM foi projetado digitalmente, fresado, cristalizado e cimentado sob a superfície dentária ainda com o dique de borracha em posição. Após a finalização dessa etapa, o dique de borracha foi removido, a oclusão foi verificada apresentando ótimos resultados estéticos e funcionais. Resultados: O isolamento absoluto utilizado no presente estudo funciona como um excelente dispositivo para retração gengival. Conclusão: O isolamento absoluto pode ser recomendado em atividades clínicas de escaneamento intraoral favorecendo a qualidade do resultado final dos tratamentos (AU)

The use of rubber dam in the survival of RMGIC restorations in primary molars: a 30-month randomized controlled clinical trial

Abstract This study was a randomized controlled clinical trial with two parallel arms and the objective was to compare the survival of resin modified glass ionomer (RMGIC) restorations in primary teeth using rubber dam or cotton roll isolation after a 30-month follow-up period. Ninety-two children (mean age 6.8 ± 1.37) and 200 primary molars with occlusal or occluso-proximal cavitated dentin caries lesions were randomly assigned into two groups: cotton rolls and rubber dam. All lesions were restored using RMGIC (RIVA Light Cure) after selective caries removal. Restorative failure and lesion arrestment were evaluated by two independent, trained, and calibrated examiners through clinical and radiographic examinations. The Kaplan-Meier test was used to assess the survival of restorations and Cox regression was used to assess the association of risk factors with restorative failure. There was no significant difference in survival rates between groups (p = 0.17). Older age (HR = 2.81 [95%CI: 1.47-5.44]) and higher rate of gingival bleeding (HR = 0.47 [95%CI: 0.23-0.99]) were associated with restorative failure. No patient had painful symptoms, pulp outcomes, or radiographic changes compatible with lesion progression. The use of rubber dam isolation did not increase the survival rate of occlusal and occluso-proximal restorations using RMGIC in primary molars after 30 months of follow-up. Since the survival is not influenced by the type of isolation, the professional can safely choose the appropriate technique for each case, considering his experience and preferences, as well as those of the patient.

Effect of Selenium-yeast on Cognitive Performance on Pregnant Dams Exposed to Noise Stress

A total of twelve pregnant Wistar rats were used, and randomly divided into three groups (n=4). Group A (negative control), not exposed to noise stress), group B (1mL/kg of distilled water + 4h /15 days noise stress), group C (0.04 mg/kg) of selenium-yeast + 4 h/15 days noise stress). On day 18 and 19 of gestation cognitive tests were conducted using Y-maze and Novel Object Recognition Test. A significant increase (P ? 0.05) was observed in the percentage alternation and discrimination index in group A compared with group B. However, the percentage alternation and DI were significantly (P ? 0.05) decreased in group C compared with group B. In conclusion, noise stress induces cognitive deficit, this deficit can be mitigated with the administration of selenium-yeast.

Factors associated with paid work after the dam failure: Brumadinho Health Project / Fatores associados ao trabalho remunerado após o rompimento da barragem: Projeto Saúde Brumadinho

ABSTRACT: Objective: To analyze the factors associated with paid work, after the dam failure, based on geographic strata, among men and women residing in Brumadinho, Minas Gerais. Methods: Baseline data from participants of the Brumadinho Health Project, aged 18 years or older, obtained through a questionnaire, between July and November 2021 (n=2,783) were used. The dependent variable was paid work after the dam failure and the explanatory variables were geographic stratum, age, education, race/skin color, self-perception of health and employment relationship before the event. The adjusted analysis was estimated by logistic regression. All analyses were performed separately for men and women. Results: Paid work after the dam failure was reported by 58.3% (95%CI 55.0-61.6) of the participants, with the highest prevalence among men (71.4%; 95%CI 67.1-75.3) compared to women (48.6%; 95%CI 44.3-52.8) (p<0.001). After adjustments, the results showed that the population who was directly exposed to the disaster was less likely to have a paid work after it, both for women (OR=0.68; 95%CI 0.48-0.95) and for men (OR=0.48; 95%CI 0.30-0.78). In addition, women directly exposed to the disaster and who reported being self-employed before it were less likely to have a paid work, compared to women who reported being employed with or without a formal contract. Conclusion: Participation in the labor market is determined by several factors. Thus, intersectoral policies are necessary the population's demands of life and work are met in disaster situations.

RESUMO: Objetivo: Analisar os fatores associados ao trabalho remunerado, após o rompimento da barragem, com ênfase no estrato geográfico, entre homens e mulheres residentes em Brumadinho, Minas Gerais. Métodos: Foram utilizados dados dos participantes da linha de base do Projeto Saúde Brumadinho, com 18 anos ou mais de idade, obtidos por aplicação de questionário, entre julho e novembro de 2021 (n=2.783). A variável dependente foi trabalho remunerado após o rompimento da barragem, e as variáveis explicativas foram estrato geográfico, idade, escolaridade, raça/cor, autopercepção de saúde e vínculo de trabalho antes do rompimento da barragem. A análise ajustada foi estimada pela regressão logística. Todas as análises foram realizadas separadamente para homens e mulheres. Resultados: O trabalho remunerado após o rompimento da barragem foi relatado por 58,3% (IC95% 55,0-61,6) dos participantes, sendo a maior prevalência entre os homens (71,4%; IC95% 67,1-75,3) em comparação às mulheres (48,6%; IC95% 44,3-52,8) (p<0,001). Após ajustes, os resultados mostraram que a população diretamente exposta apresentou menor chance de ter trabalho remunerado após o rompimento da barragem, tanto para as mulheres (OR=0,68; IC95% 0,48-0,95) quanto para os homens (OR=0,48; IC95% 0,30-0,78). Além disso, mulheres diretamente expostas ao rompimento da barragem e que relataram trabalho autônomo antes do rompimento apresentaram menor probabilidade de ter trabalho remunerado, em comparação àquelas que informaram trabalhar com ou sem carteira assinada. Conclusão: A participação no mercado de trabalho é determinada por vários fatores. Dessa forma, políticas intersetoriais são necessárias para atender às demandas de vida e trabalho da população em situações de desastre.

Proposta metodológica para previsão de impactos decorrentes de acidentes com barragens de rejeito / Methodological proposal to predict impacts arising from accidents with tailings dams

RESUMO O rompimento de barragens de rejeitos é alvo de preocupação em função do alto dano potencial associado, sendo necessária uma avaliação de previsão de impactos que permita melhor caracterização da área a jusante, e que a coleta de dados seja realizada pelos órgãos fiscalizadores, e não por parte dos empreendedores. Este trabalho teve por objetivo propor uma classificação dos impactos decorrentes de rompimentos desses barramentos, tendo como referência as avaliações de danos adotadas pelas legislações de segurança de barragens no Brasil. Para isso, foi elaborada uma tabela de critérios e subcritérios com os parâmetros que influenciam na determinação dos impactos causados, os quais foram hierarquizados por meio da aplicação do Analytic Hierarchy Process (AHP), proposto por Saaty (1991). Para determinação dos valores de importância de cada impacto, utilizou-se a técnica Ad-Hoc por meio da dinâmica do brainstorming, com profissionais que realizaram julgamentos a partir de comparações paritárias dos critérios adotados. A ocupação humana na área a jusante, como observado nas legislações, apresentou o maior peso. O volume do reservatório e os impactos no meio socioeconômico apresentaram pesos inferiores aos impactos nos meios físico e biótico, contrastando com as legislações. A aplicação da metodologia em barragem do Quadrilátero Ferrífero comprovou a coerência do índice de impactos ambientais (IA) proposto, indicando as fragilidades da área atingida. O detalhamento da área a jusante permitiu identificar aspectos que podem potencializar ou amortizar os impactos, como periculosidade do rejeito, volume do reservatório e proximidade de centros urbanos.

ABSTRACT The tailings dam failures is a matter of concern due to the high damage potential associated, requiring an assessment of forecast impacts that allows better characterization of downstream area, and that data collection is performed by regulatory agencies and not by the entrepreneurs. This work aimed to propose a classification of impacts resulting from hypothetical tailings dams failure, based on the damage assessment adopted by dam safety legislation in Brazil. For that, a table of criteria and subcriteria was elaborated with the parameters that influence the determination of the resulting impacts, which were hierarchized through the application of the Analytic Hierarchy Process (AHP), proposed by Saaty (1991). To determine the weights of each impact, the Ad-Hoc technique was used through the dynamics of brainstorming, with professionals who made judgments from parity comparisons of the determined criteria. Human occupation in the downstream area, as noted in the legislation, presented the greatest weight. The volume of the reservoir and the impacts on the socioeconomic environment presented lower weights to the impacts in the physical and biotic environments, in contrast with the legislation. The application of the methodology in the Quadrilatero Ferrifero dam proved the consistency of the proposed impact index (IA), indicating the fragilities of the affected area. The detailing of the downstream area allowed to identify aspects that could potentiate or amortize the impacts, such as hazardous waste, reservoir volume, and proximity to urban centers.

Impactos físicos e psicológicos na população de Brumadinho após rompimento da barragem de rejeitos / Physical and psychological impacts on the population of Brumadinho after rupture of the tailings dam

Objetivo: Esta revisão sistemática busca identificar os fatores que podem impactar na saúde das vítimas do rompimento da barragem, em especial aqueles riscos surgidos ou incrementados com a ruptura da barragem de rejeitos em Brumadinho. Fontes de Dados: Bases de dados informatizadas, Pubmed, Scopus e Web of Science nos idiomas Português e Inglês, restringindo-se a publicações nos últimos cinco anos. Critérios de inclusão: estudos que abordem aspectos relacionados à saúde dos envolvidos na ruptura da barragem de Brumadinho. Foram excluídos estudos que abordassem qualquer tema que escapasse desse escopo. Síntese dos Dados: Foram identificadas um total de 157 publicações. Excluíram-se 127 pelo título, por serem duplicatas e pelos critérios de exclusão. Analisou-se 30 integralmente, restando 19(63,3%). Resultados: Por meio dos critérios de elegibilidade dessa revisão foram encontrados artigos sobre as consequências do achado de metais pesados nas águas dos rios, como o favorecimento de genes multirresistentes e o comprometimento de fonte de água potável. Também foram descritos os impactos na saúde mental em Brumadinho, pois nota-se que a população está sujeita a efeitos psicológicos traumáticos secundários a desastres ambientais. Por meio dessa busca foi identificado que ainda há a necessidade de novos estudos sobre os impactos da mudança da morfologia hídrica e social para a saúde desses indivíduos. Conclusão:Alguns poucos impactos diretos e indiretos já estão descritos na literatura de forma incipiente, de forma que ações de mitigação são necessárias para dirimir os impactos já observados.

Abstract: This systematic review seeks to identify the factors that may impact on the health of the victims of the dam rupture, especially those risks arising or increased with the rupture of the tailings dam in Brumadinho. Data Sources: Computerized databases, Pubmed, Scopus and Web of Science in Portuguese and English, restricted to publications from the last five years. Inclusion criteria: studies that address aspects related to the health of those involved in the Brumadinho dam rupture. Studies that addressed any topic that fell outside this scope were excluded. Summary of Data: A total of 157 publications were identified. 127 were excluded by title, because they are duplicates and by exclusion criteria. 30 were analyzed in full and, of these, only 19 (63,3%) were eligible. Results: Through the eligibility criteria of this review, articles were found on the consequences of the finding of heavy metals in river waters, such as the favoring of multidrug-resistant genes and the impairment of drinking water sources. The impacts on mental health in Brumadinho were also described, it is noted that the population is subject to traumatic psychological effects secondary to environmental disasters. Through this search, it was identified that there is still a need for further studies on the impacts of changing water and social morphology on the health of these individuals. Conclusion: Direct and indirect impacts are shown and that actions are fundamental for their mitigation.

Influence of Isolation Technique on the Survival of Resin-Modified Glass-Ionomer Restorations in Primary Molars: A 9-Months Randomized Controlled Trial

ABSTRACT Objective: To compare the survival of occlusal and occlusal-proximal restorations performed with resin-modified glass-ionomer cement (RMGIC) in deciduous molars using rubber dam and cotton rolls isolation. Material and Methods: Ninety-two patients were included and 200 deciduous molars with cavitated occlusal or occlusoproximal dentin caries lesions were randomized into two groups: cotton rolls (n = 100) and rubber dam (n = 100) and RMGIC restorations were placed. At baseline and in the follow-up visit, presence, severity and activity of caries lesions were registered. Two independent, blinded examiners evaluated the treated teeth clinically using the USPHS criteria and radiographically after 9 months. Descriptive analysis, survival curve (log-rank test) and Cox regression were performed to assess risk factors related to failure. Results: Out of the 179 teeth (92 cotton rolls group and 87 rubber dam group) evaluated at 9-month follow-up period. No lesion progression was observed radiographically. The overall treatment success rate was 85.47% (83.47% for cotton rolls and 87.35 rubber dam group). No significant difference between isolation methods was observed in the log-rank test (p = 0.16). Cox regression showed no risk factors related to failure. Conclusion: No difference was found in the survival of occlusal and occlusal-proximal restorations performed with RMGIC in deciduous molars using a rubber dam and cotton rolls isolation after a 9-month follow-up period.

Long-term trends of fishery landings and target fish populations in the lower La Plata basin

The La Plata basin is the second largest basin of South America and has supported important river fisheries for more than a century. In this paper, we evaluate for the first time the historical trends of landings of 21 fish taxa and the recent population trends of 27 species of commercial fishes in the lower La Plata basin (Argentina). We compiled three kinds of data sets: Total fishery landings (between 1934 and 1986) and exports (1994‒2019), fisheries monitoring programs of Chaco and Santa Fe provinces in the Paraná River (2009‒2019), and surveys of fish populations in the Upper (Corrientes, 1993‒2020) and Middle (EBIPES, 2005‒2020) Paraná River. The analysis of the historical landings showed more species declining in the lower portion of the basin than in the upper basin. Regarding recent population trends, Pimelodus spp., Hoplias spp., Salminus brasiliensis, Luciopimelodus pati, and Ageneiosus spp. declined in more than one region, while Megaleporinus spp., Pterodoras granulosus, and Oxydoras kneri showed stable to positive trends, with the other species varying in their trends between regions. These tendencies could be associated to a combination of factors such as overfishing and environmental changes that would require an ecosystem approach for their adequate management.(AU)

La Cuenca del Plata es la segunda más grande de Sudamérica y ha soportado importantes pesquerías fluviales desde hace más de un siglo. En este trabajo, evaluamos por primera vez las tendencias históricas en los desembarques pesqueros de 21 taxones de peces y las tendencias poblacionales recientes de 27 especies de peces comerciales de la baja Cuenca del Plata (Argentina). Compilamos tres tipos de datos: desembarques pesqueros totales (1934‒1986) y exportaciones (1994‒2019), programas de monitoreo de pesca comercial de las provincias de Chaco y Santa Fe en el río Paraná (2009‒2019), y relevamientos de peces en el río Paraná Alto (Corrientes, 1993‒2020) y Medio (EBIPES, 2005‒2020). El análisis de los desembarques históricos mostró más disminuciones en la porción baja de la cuenca que en la porción alta. En cuanto a las tendencias poblacionales recientes, Pimelodus spp., Hoplias spp., Salminus brasiliensis, Luciopimelodus pati y Ageneiosus spp. declinaron en más de un sector, mientras que Megaleporinus spp., Pterodoras granulosus y Oxydoras kneri mostraron tendencias estables a positivas, con las otras especies variando en sus tendencias entre regiones. Estas tendencias podrían asociarse a una combinación de factores como la sobrepesca y los cambios ambientales que requerirían una aproximación ecosistémica para su adecuado manejo.(AU)

O rejeito e suas diversas marcas: saúde dos trabalhadores da Defesa Civil no rompimento da barragem de Fundão / The reject and its various brands: health of Civil Defense workers in the rupture of the Fundão dam

RESUMO A partir do desastre socioambiental ocorrido em Mariana (MG), em 5 de novembro de 2015, o estudo buscou compreender a atividade dos técnicos da Defesa Civil que atuaram no desastre. A reflexão que aqui se desenvolve parte do esforço de dar visibilidade à atividade desses profissionais que atuam em condições permeadas de imprevisibilidades e pressões. O estudo tem como referenciais os aportes do campo da Saúde do Trabalhador e da ergologia. Trata-se de uma pesquisa empírica, de abordagem qualitativa, realizada por meio de observação direta e entrevistas individuais semiestruturadas com trabalhadores da Defesa Civil. A análise dos resultados foi organizada em duas grandes seções com os seus respectivos desdobramentos: a primeira traz uma contextualização do desastre narrada pelos diversificados profissionais que atuaram; a segunda evidencia desafios e perspectivas que os agentes de defesa civil puderam tirar da catástrofe. Diante da complexidade das situações e da dimensão imprevisível do risco, os agentes de defesa civil são constantemente convocados a 'renormatizar' e a operar escolhas a partir de sua história e de seus valores para lidar com as infidelidades do meio.

ABSTRACT From the socio-environmental disaster that took place on November 5th, 2015 in Mariana (MG), the study sought to understand the activity of Civil Defense technicians who acted in the disaster, aiming to collaborate for actions of worker's health surveillance. The reflection that develops here is part of the effort to give visibility to the activity of those professionals who work in conditions permeated with unpredictability and pressure. The study has as references the contributions from the field of Occupational Health and ergology. This is an empirical research with a qualitative approach, conducted through direct observation and semi-structured individual interviews with Civil Defense professionals. The analysis of the results was organized in two large sections with their respective consequences: the first brings a contextualization of the disaster narrated by the several professionals who worked during it; the second focuses on the challenges and perspectives that civil defense agents have been able to draw from the disaster. Faced with the complexity of situations and the unpredictable dimension of risk, civil defense agents are constantly called upon to 'renormatize' and operate choices based on their history and their values to deal with environmental infidelities.

Do hydroelectric dams affect the abundance and population structure of freshwater shrimps?

Freshwater shrimps play an important role in many ecological processes since they are epibenthic detritivores but also prey on other invertebrates and are predated by fishes. The knowledge about their biology allow the development of management strategies to improve the use of natural resources by avoiding overfishing and enhancing productivity. Here we evaluated the population structure of the shrimp Macrobrachium amazonicum in the river Rio Grande, upstream of the Água Vermelha hydroelectric dam. They were captured monthly from October 2017 until March 2018, in six sites along the river. The first site was ∿1000 m distant from the dam and the sixth was ∿4000 m distant. A sac-like sieve and traps were used to capture the shrimps. The sieve was dragged three times for 180o. The traps were left by the river margins for six hours. In the laboratory, the shrimps were sexed and measured (carapace length; CL). In total, 6455 individuals were captured: 4499 females (294 breeding), 1445 males, and 217 juveniles. Female mean size was 7.50 ± 3.47 mm, male mean size was 7.44 ± 2.40 mm, and juvenile mean size was 3.24 ± 1.10 mm. The smallest individual was found in site III and it was a juvenile of 1.08 mm. The largest had 20 mm and was found in site II. The smallest breeding female had 3.8 mm CL. The largest individuals were more abundant in the sites near the dam, whereas the smallest were more abundant in the farthest sites. The highest abundance was seen in sites III and IV, and the lowest, in site VI. Unlike males and juveniles, females (both breeding and non-breeding) were more abundant (Anova, p < 0.01) near the dam. By knowing the population structure of M. amazonicum it is possible to understand how they are being affected by the environmental changes caused by the hydroelectric dam

"isso é tirar a vida das pessoas": barragens e violação de direitos / "eso es quitarle la vida a las personas": represas y violación de derechos / "this is taking people's lives": dams and violation of rights

Resumo Este estudo possui o objetivo de analisar as interfaces entre a implantação da hidrelétrica de Itá em Santa Catarina e a violação dos Direitos Humanos de agricultores atingidos pela obra que permaneceram residindo no entorno reservatório após a finalização do empreendimento. O estudo, de cunho qualitativo, fundamentou-se na pesquisa participante. A coleta de dados iniciou em fevereiro de 2016 e foi concluída em dezembro do mesmo ano. Foram entrevistadas 12 pessoas atingidas pela construção da barragem de Itá, além de observações participantes periódicas em toda região rural do entorno do reservatório. Os dados obtidos foram submetidos à análise de conteúdo. Os resultados da pesquisa apontam que, os participantes do estudo tiveram violados os direitos à saúde, educação, emprego e infraestrutura, perdendo também projetos de vidas. Portanto, é necessário atentar para o atual formato de implantação de barragens construindo políticas públicas que garantam os direitos das populações atingidas por estes empreendimentos.

Resumen El objetivo del estudio es analizar las relaciones entre la implantación de la hidroeléctrica de Itá, en Santa Catarina, y la violación de derechos humanos de agricultores que permanecieron viviendo en el entorno del embalse tras su finalización y que fueron afectados por él. El estudio, de tipo cualitativo, se fundamentó en la investigación participativa. La recolección de datos empezó en febrero de 2016 y concluyó en diciembre del mismo año. Se entrevistaron a 12 personas afectadas por la construcción de dicha represa, además de la realización de periódicas observaciones participantes en su entorno rural. Los datos obtenidos fueron sometidos al análisis de contenido. Los resultados demostraron que los entrevistados sufrieron violación de derechos a salud, educación, empleo e infraestructura, perdiendo, incluso, proyectos de vida. Así, es necesario examinar las actuales formas de implantación de represas a través de políticas públicas que garanticen los derechos de las poblaciones afectadas.

Abstract This study aims to analyze the interfaces between the implementation of Itá hydroelectric power plant in the Brazilian state of Santa Catarina and the violation of human rights of the farmers who remained living in the reservoir's surrounding area after the project was finished and who were affected by it. The qualitative study was based on participant research. Data collection began in February 2016 and was completed in December of the same year. Twelve people affected by the construction of Itá dam were interviewed, and there were periodic participant observations in all rural areas surrounding the reservoir. Data were submitted to content analysis. Research results indicated that the research participants had their rights to health, education, employment and infrastructure violated, losing also their life projects. Therefore, it is necessary to focus on the current model for dam implantation by developing public policies that ensure the rights of populations affected by these enterprises.

Upstream dam impacts on gilded catfish Brachyplatystoma rousseauxii (Siluriformes: Pimelodidae) in the Bolivian Amazon

This paper explores the effects of two run-of-river dams (Jirau and Santo Antônio) built in cascade in the middle Madeira River (Brazil) on the interruption of long-distance migration routes of the gilded catfish (Brachyplatystoma rousseauxii). A participative monitoring system was set up to compare capture by commercial fishers approximately 1500 km upstream of the dams in Bolivia, before (1998-2007) and after (2015-2017) dam closure. A significant decrease in gilded catfish catches and in catch per unit effort was observed after dam closure, whereas no significant difference in mean weight was found. Back-estimation of age suggests that the few individuals remaining after dam closure in 2009 are a mixture of old homers that returned upstream before dam closure, and residents hatched after dam closure and trapped in the upper Madeira. Unless fishways in the Madeira River dams improve their efficiency, the gilded catfish might become rare and in danger of regional extinction in the upper Madeira basin in the next few years, negatively affecting river fisheries.(AU)

Este estudio explora el impacto de las represas en cascada Jirau y Santo Antônio en el curso medio del río Madeira (Brasil) sobre la interrupción de la ruta de migración del bagre dorado (Brachyplatystoma rousseauxii). Se estableció un sistema de monitoreo participativo para comparar la captura de dorado por pescadores comerciales en Bolivia, aproximadamente 1 500 km río arriba de las represas, antes (1998-2007) y después (2015-2017) de su cierre. Se observó una disminución significativa en las capturas y en la captura por unidad de esfuerzo de dorado después del cierre de ambas represas. No hubo diferencias significativas en el peso promedio antes y después del cierre. La estimación de la edad de los pocos individuos capturados arriba de las represas sugiere que se trata de una mezcla de individuos adultos que han podido pasar las represas antes de su cierre en 2009, y residentes nacidos después del cierre de las represas, atrapados en el alto Madeira. Si los sistemas de traspaso de peces implementados en las represas del rio Madeira no mejoran su eficiencia, el dorado podría volverse escaso y en peligro de extinción regional en la cuenca alta del Madeira en los próximos años, afectando negativamente la pesca de esta especie.(AU)

A legitimação da injustiça social e ambiental: análise da legislação no campo da construção de hidrelétricas no Brasil / The legitimation of social and environmental injustice: analysis of legislation on the construction of hydroelectric power plants in Brazil

Este artigo pretende apresentar, a partir da análise da legislação vigente no campo da construção de hidrelétricas no Brasil, os diferentes ângulos da banalização do sofrimento das populações atingidas por estas obras. A pesquisa qualitativa teve um delineamento exploratório-descritivo e se apoiou na técnica da análise documental. O estudo dos materiais foi orientado pelas seguintes questões: a) como o documento aborda o sofrimento das populações atingidas pela construção de hidrelétricas; b) quais são os elementos do documento que contribuem para a invisibilidade da injustiça e do sofrimento das populações atingidas pela construção de hidrelétricas? Destaca-se a invisibilidade das populações atingidas pelos grandes empreendimentos no contexto da legislação vigente, excluindo aspectos que vão do sofrimento até questões atreladas à saúde, trabalho, relações sociais e culturais. Em contrapartida, privilegiam-se normativas que garantem a comercialização dos recursos naturais e o direito dos consumidores.

This paper intends to show, based on analysis of current legislation regarding the construction of hydroelectric power plants in Brazil, the different perspectives of suffering trivialization of populations affected by these enterprises. The qualitative research had an exploratory-descriptive design of qualitative based on document analysis technique. The following questions guided the material analysis: a) how does the document address the suffering of populations affected by the construction of hydroelectric power plants; b) which document components increase the invisibility of injustice and suffering of populations affected by the construction of hydroelectric power plants? The invisibility of the populations affected by the big enterprises in current legislation is evidenced, since it excludes aspects ranging from suffering to health, working, social and cultural relation issues. On the other hand, it favors regulations that guarantee commercialization of natural resources and consumers rights.

Life-long Maternal Cafeteria Diet Promotes Tissue-Specific Morphological Changes in Male Offspring Adult Rats

ABSTRACT Here, we evaluated whether the exposure of rats to a cafeteria diet pre- and/or post-weaning, alters histological characteristics in the White Adipose Tissue (WAT), Brown Adipose Tissue (BAT), and liver of adult male offspring. Female Wistar rats were divided into Control (CTL; fed on standard rodent chow) and Cafeteria (CAF; fed with the cafeteria diet throughout life, including pregnancy and lactation). After birth, only male offspring (F1) were maintained and received the CTL or CAF diets; originating four experimental groups: CTL-CTLF1; CTL-CAFF1; CAF-CTLF1; CAF-CAFF1. Data of biometrics, metabolic parameters, liver, BAT and WAT histology were assessed and integrated using the Principal Component Analysis (PCA). According to PCA analysis worse metabolic and biometric characteristics in adulthood are associated with the post-weaning CAF diet compared to pre and post weaning CAF diet. Thus, the CTL-CAFF1 group showed obesity, higher deposition of fat in the liver and BAT and high fasting plasma levels of glucose, triglycerides and cholesterol. Interestingly, the association between pre and post-weaning CAF diet attenuated the obesity and improved the plasma levels of glucose and triglycerides compared to CTL-CAFF1 without avoiding the higher lipid accumulation in BAT and in liver, suggesting that the impact of maternal CAF diet is tissue-specific.

Desenvolvimento, saúde e meio ambiente: contradições na construção de hidrelétricas / Development, health and environment: contradictions in the construction of dams

Resumo:O contexto atual de construção de hidrelétricas no Brasil apresenta diversas controvérsias, pautadas especialmente na contradição existente entre o discurso oficial focado nos benefícios gerados por esses empreendimentos e os importantes impactos socioambientais, sérios e irreversíveis, provocados pela construção das usinas e evidenciados pelas experiências daqueles que vivenciam essas transformações. Neste sentido, este artigo se propõe a analisar e discutir as interfaces entre desenvolvimento econômico, meio ambiente e saúde no contexto da construção de hidrelétricas no Brasil.

Abstract:The current context of the construction of dams in Brazil shows several controversies, mainly lined up with the existing contradiction between the official speech focused on the benefits resulting from such enterprises and the important, serious and irreversible socio environmental impacts caused by the construction of dams, which are attested by the experience of those people who pass through such transformations. In this sense, the present article proposes to analyze and discuss the interfaces between economic development, environment and health in the context of the construction of dams in Brazil.

Effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle Xingu River in the eastern Amazon basin

Abstract The structure of fish assemblages in Neotropical rivers is influenced by a series of environmental, spatial and/or temporal factors, given that different species will occupy the habitats that present the most favourable conditions to their survival. The present study aims to identify the principal factors responsible for the structuring of the fish assemblages found in the middle Xingu River, examining the influence of environmental, spatial, and temporal factors, in addition to the presence of natural barriers (waterfalls). For this, data were collected every three months between July 2012 and April 2013, using gillnets of different sizes and meshes. In addition to biotic data, 17 environmental variables were measured. A total of 8,485 fish specimens were collected during the study, representing 188 species. Total dissolved solids, conductivity, total suspended matter, and dissolved oxygen concentrations were the variables that had the greatest influence on the characteristics of the fish fauna of the middle Xingu. Only the barriers and hydrological periods played a significant deterministic role, resulting in both longitudinal and lateral gradients. This emphasizes the role of the connectivity of the different habitats found within the study area in the structuring of its fish assemblages.

Resumo A estrutura da ictiofauna em rios neotropicais é constantemente influenciada por fatores ambientais, espaciais e/ou temporais, uma vez que as espécies tendem a ocupar ambientes com condições favoráveis à sua sobrevivência. Dessa forma, esta pesquisa tem como objetivo responder qual o principal fator responsável pela estruturação das assembleias de peixes no Médio Rio Xingu, testando a influência dos fatores ambientais, espaciais e temporais, além da presença de barreiras naturais (cachoeiras). Os dados foram coletados, trimestralmente, entre os meses de julho de 2012 e abril de 2013, utilizando redes de emalhe de tamanhos de malha variados. Foram mensuradas 17 variáveis ambientais. Foram coletados 8.485 indivíduos distribuídos em 188 espécies. Observou-se que sólidos dissolvidos totais, condutividade, material em suspensão total e oxigênio dissolvido foram as variáveis que mais influenciaram a ictiofauna do médio Rio Xingu. Observou-se que apenas as barreiras naturais e os períodos hidrológicos foram determinantes, ocorrendo tanto variação longitudinal quanto lateral, ficando claro que a conectividade entre os diferentes trechos do médio rio Xingu é de suma importância na estruturação das assembleias de peixes.

Effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle Xingu River in the eastern Amazon basin / Efeito das cachoeiras e do pulso de inundação na estrutura das assembleias de peixes do Médio Rio Xingu, Amazônia oriental

The structure of fish assemblages in Neotropical rivers is influenced by a series of environmental, spatial and/or temporal factors, given that different species will occupy the habitats that present the most favourable conditions to their survival. The present study aims to identify the principal factors responsible for the structuring of the fish assemblages found in the middle Xingu River, examining the influence of environmental, spatial, and temporal factors, in addition to the presence of natural barriers (waterfalls). For this, data were collected every three months between July 2012 and April 2013, using gillnets of different sizes and meshes. In addition to biotic data, 17 environmental variables were measured. A total of 8,485 fish specimens were collected during the study, representing 188 species. Total dissolved solids, conductivity, total suspended matter, and dissolved oxygen concentrations were the variables that had the greatest influence on the characteristics of the fish fauna of the middle Xingu. Only the barriers and hydrological periods played a significant deterministic role, resulting in both longitudinal and lateral gradients. This emphasizes the role of the connectivity of the different habitats found within the study area in the structuring of its fish assemblages.

A estrutura da ictiofauna em rios neotropicais é constantemente influenciada por fatores ambientais, espaciais e/ou temporais, uma vez que as espécies tendem a ocupar ambientes com condições favoráveis à sua sobrevivência. Dessa forma, esta pesquisa tem como objetivo responder qual o principal fator responsável pela estruturação das assembleias de peixes no Médio Rio Xingu, testando a influência dos fatores ambientais, espaciais e temporais, além da presença de barreiras naturais (cachoeiras). Os dados foram coletados, trimestralmente, entre os meses de julho de 2012 e abril de 2013, utilizando redes de emalhe de tamanhos de malha variados. Foram mensuradas 17 variáveis ambientais. Foram coletados 8.485 indivíduos distribuídos em 188 espécies. Observou-se que sólidos dissolvidos totais, condutividade, material em suspensão total e oxigênio dissolvido foram as variáveis que mais influenciaram a ictiofauna do médio Rio Xingu. Observou-se que apenas as barreiras naturais e os períodos hidrológicos foram determinantes, ocorrendo tanto variação longitudinal quanto lateral, ficando claro que a conectividade entre os diferentes trechos do médio rio Xingu é de suma importância na estruturação das assembleias de peixes.

Effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle Xingu River in the eastern Amazon basin / Efeito das cachoeiras e do pulso de inundação na estrutura das assembleias de peixes do Médio Rio Xingu, Amazônia oriental

Abstract The structure of fish assemblages in Neotropical rivers is influenced by a series of environmental, spatial and/or temporal factors, given that different species will occupy the habitats that present the most favourable conditions to their survival. The present study aims to identify the principal factors responsible for the structuring of the fish assemblages found in the middle Xingu River, examining the influence of environmental, spatial, and temporal factors, in addition to the presence of natural barriers (waterfalls). For this, data were collected every three months between July 2012 and April 2013, using gillnets of different sizes and meshes. In addition to biotic data, 17 environmental variables were measured. A total of 8,485 fish specimens were collected during the study, representing 188 species. Total dissolved solids, conductivity, total suspended matter, and dissolved oxygen concentrations were the variables that had the greatest influence on the characteristics of the fish fauna of the middle Xingu. Only the barriers and hydrological periods played a significant deterministic role, resulting in both longitudinal and lateral gradients. This emphasizes the role of the connectivity of the different habitats found within the study area in the structuring of its fish assemblages.

Resumo A estrutura da ictiofauna em rios neotropicais é constantemente influenciada por fatores ambientais, espaciais e/ou temporais, uma vez que as espécies tendem a ocupar ambientes com condições favoráveis à sua sobrevivência. Dessa forma, esta pesquisa tem como objetivo responder qual o principal fator responsável pela estruturação das assembleias de peixes no Médio Rio Xingu, testando a influência dos fatores ambientais, espaciais e temporais, além da presença de barreiras naturais (cachoeiras). Os dados foram coletados, trimestralmente, entre os meses de julho de 2012 e abril de 2013, utilizando redes de emalhe de tamanhos de malha variados. Foram mensuradas 17 variáveis ambientais. Foram coletados 8.485 indivíduos distribuídos em 188 espécies. Observou-se que sólidos dissolvidos totais, condutividade, material em suspensão total e oxigênio dissolvido foram as variáveis que mais influenciaram a ictiofauna do médio Rio Xingu. Observou-se que apenas as barreiras naturais e os períodos hidrológicos foram determinantes, ocorrendo tanto variação longitudinal quanto lateral, ficando claro que a conectividade entre os diferentes trechos do médio rio Xingu é de suma importância na estruturação das assembleias de peixes.

Non-marine ostracodes from highland lakes in East-central Mexico / Ostrácodos no-marinos de lagos en el altiplano este-centro de México

The ostracode fauna of the neartic-neotropical transitional zone has remained poorly known until this study. Ten ostracode species inhabit ten highland lakes (five maar lakes (phreatic/phreato-magmatic explosion origin), one volcanic-tectonic lake, three natural dams and one man-made dam) in East-central Mexico. Surface sediments from the deepest part and the littoral zone from all studied lakes were collected. Environmental variables (pH, temperature, dissolved oxygen, conductivity, TDS) were measured in situ and parallel water samples for chemical analysis were collected for habitat description. Widely distributed species in the study area (≥5 lakes) include Cypridopsis vidua, Darwinula stevensoni and Eucandona cf. patzcuaro. Limnocytherina axalapasco is an endemic species and was collected in three maar lakes and in one man-made dam. Rare species included: Chlamydotheca arcuata?, Fabaeformiscandona acuminata?, Ilyocypris gibba?, Limnocythere friabilis?, Potamocypris smaragdina? and Potamocypris unicaudata?. Highest species richness (6 spp.) was found in the large and shallow Lake Metztitlán (2.6km², 5.5m deep), with the lake water type HCO3->>SO4²->Cl--- Ca2+>Na+>Mg2+. The rest of studied lakes (<63m, <27km²) had not more than three species. For instance, only two ostracode species were collected in Lake Alchichica, which is the largest, deepest and most saline studied maar lake. Rev. Biol. Trop. 63 (2): 401-425. Epub 2015 June 01.

La fauna de ostrácodos de la zona de transición néartica-neotropical ha sido poco estudiada hasta este estudio. En el este-centro de México, habitan diez especies de ostrácodos en diez lagos: cinco lagos maar (originados por explosiones freáticas/freato-magmáticas), un lago volcánico-tectónico, tres embalses naturales y un embalse artificial. De la parte más profunda y de las zonas litorales de todos los lagos estudiados se recolectaron sedimentos superficiales para el análisis de ostrácodos. También se midieron in situ las variables ambientales: pH, temperatura, oxígeno disuelto, conductividad, SDT, además se recolectaron muestras de agua paralelas para análisis químico con el objetivo de describir el hábitat. Especies con una amplia distribución en el área de estudio (≥5 lagos) incluyen: Cypridopsis vidua, Darwinula stevensoni y Eucandona cf. patzcuaro. Limnocytherina axalapasco es una especie endémica y fue recolectada en tres lagos maar y en el embalse artificial. Especies raras incluyeron: Chlamydotheca arcuata?, Fabaeformiscandona acuminata?, Ilyocypris gibba?, Limnocythere friabilis?, Potamocypris smaragdina? y Potamocypris unicaudata? La riqueza de especies más alta (6 spp.) se encontró en el lago más extenso y somero, lago Metztitlán (2.6km², 5.5m de profundidad), con el tipo de agua HCO3->>SO4²->Cl--- Ca2+>Na+>Mg2+. El resto de lagos estudiados (<63m, <27km²) presentaron no más de tres especies. Por ejemplo, solamente dos especies de ostrácodos fueron recolectadas en el lago Alchichica, el cual es el más extenso, profundo y salino entre los lagos maar estudiados.

ABUNDANCIA, ESTRUCTURA POBLACIONAL Y CONSERVACIÓN DE Podocnemis lewyana (PODOCNEMIDIDAE) EN EL RÍO PRADO, COLOMBIA / Abundance, Population Structure and Conservation of Podocnemis lewyana (Podocnemididae) at the Prado River, Colombia

En el río Prado, localizado en el sur oriente de Colombia existe una población de Podocnemis lewyana, una tortuga endémica y en peligro de extinción. Para esta población se determinó la abundancia relativa, la estructura poblacional y las amenazas a la conservación a partir de información de campo obtenida en los años 2007 y 2009. La abundancia relativa se estimó por medio de captura de tortugas por unidad de tiempo. Adicionalmente, solo en el 2009, se realizó un conteo de individuos por kilómetro recorrido para contrastarlo con poblaciones del norte del país. La estructura poblacional se determinó por la frecuencia de individuos en varias clases de tamaño y con la proporción de sexos de los animales capturados. Se examinó el dimorfismo sexual en animales adultos con base en su morfometría. En total se capturaron 110 tortugas el año 2007 y 72 tortugas en el 2009. Se tuvo un promedio de 54,46 avistamientos/km (2009), siendo hasta el momento la población más abundante del país. La estructura de la población se caracterizó por una mayor frecuencia de individuos de 21-30 cm de largo recto máximo del caparazón (LRC) y ningún individuo de menos de 10 cm LRC ni mayor a 40 cm LRC. La proporción de sexos fue de 2,52:1 en el 2007 y de 2,75:1 en el 2009, siendo mayor para hembras. Las principales amenazas identificadas para la población del río Prado fueron (i) las alteraciones de su hábitat, (ii) cambios en el caudal natural del río, (iii) uso de artes de pesca inadecuados, y (iv) la probable interrupción de sus migraciones. Se propone el río Prado como lugar prioritario para la investigación y conservación de Podocnemis lewyana en la cuenca alta del río Magdalena.

Along the Prado River, at southeast of Colombia, there is a population of Podocnemis lewyana, an endemic and endangered river turtle. Relative abundance, population structure and conservation threats were determined using field data obtained in 2007 and 2009. Relative abundance was estimated by turtle catch per unit of time, which was used to compare between the two sampling years. Additionally, turtles per kilometer were counted in 2009 alone, to compare with other populations distributed in the north of the country. The population structure was determined by the frequency of individuals of several size classes and sex ratio of captured animals. Sexual dimorphism was examined in adult animals by morphometry. One hundred and ten turtles were captured in 2007 and 72 in 2009. The relative abundance of individuals observed was an averaged of 54.46 sightings/ km representing the most abundant population of the country so far. The population's structure was characterized by a higher frequency of individuals of 21-30 cm maximum straight carapace length SCL and absence of individuals of less than 10 cm SCL or greater than 40 cm SCL. Sex ratio was 2.52:1 for 2007 and 2.75:1 for 2009, being higher for females. The main identified threats to the population of P. lewyana at Prado River were (i) alterations of habitat, (ii) changes in the natural flow of the river, (iii) the use of inappropriate fishing arts and (iv) probable interruption of migrations. Prado River is hereby proposed as priority area for further research and conservation of Podocnemis lewyana in the upper Magdalena river basin.