4,571 research outputs found
The biology and ecology of the Antarctic limpet Nacella concinna
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Previous issue date: 2015Instituto Nacional de Ciência e Tecnologia Antártico de Pesquisas Ambientais (INCT-APA)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)Physiological studies suggest that Antarctic marine organisms are adversely affected by rising global temperatures and ocean acidification and have poor prospects for survival. However, according to ecological studies, their vulnerability might be less severe than initially thought. Thus, a realistic forecast of species survival and Antarctic biodiversity should be based on studies from a variety of species under consideration of ecological factors. The limpet Nacella concinna is often found in the rocky intertidal and sublittoral zones of the Antarctic Peninsula and adjacent subantarctic islands. This review summarizes most of the available information on the biology of this limpet, one of the most conspicuous invertebrates of the intertidal zone. There is some evidence that adult N. concinna are physiologically flexible and can acclimate to 3 A degrees C. However, the requirements of the larval stage are poorly known, thus precluding realistic predictions of how elevated temperatures will affect N. concinna populations. Data on physiological performance (righting ability, tenacity and radula rasping rate) under different temperatures could provide a useful baseline for further field investigations on the effects of warming. The species could be used as model organism for investigating the biological effects of ongoing global warming on slow-growing Antarctic ectotherms. Nacella concinna might also be a better biomonitor for polycyclic aromatic hydrocarbons than other Antarctic mollusks.[Suda, Cecilia N. K.; Vani, Gannabathula S.; de Oliveira, Mariana Feijo; Rodrigues, Edson, Jr.; Rodrigues, Edson; Lavrado, Helena P.] Univ Fed Rio de Janeiro, Natl Inst Sci & Technol Antarctic Environm Res IN, Headquarters, BR-21941902 Rio De Janeiro, RJ, Brazil[Suda, Cecilia N. K.; Vani, Gannabathula S.; de Oliveira, Mariana Feijo; Rodrigues, Edson] Universidade de Taubaté (Unitau), Basic Biosci Inst, BR-12030180 Taubate, SP, Brazil[de Oliveira, Mariana Feijo; Rodrigues, Edson, Jr.] Univ Fed Parana, Dept Cell Biol, BR-81990970 Curitiba, Parana, Brazil[Lavrado, Helena P.] Univ Fed Rio de Janeiro, Dept Marine Biol, BR-21941902 Rio De Janeiro, RJ, Brazi
Arginine metabolism of the Antarctic Bivalve Laternula elliptica (King & Broderip, 1831): an ecophysiological approach
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Previous issue date: 2009Universidade Federal do Rio de Janeiro (UFRJ)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Ministério do Meio Ambiente (MMA)Secretariat of the Inter-Ministry Commission for Marine Resources (SeCIRM)The potential aerobic ATP-generating pathway and the argininolytic capacity of the Antarctic bivalve Laternula elliptica in its main tissues were measured by the specific activity of the enzymes malate dehydrogenase (MDH), citrate synthase (CS) and arginase. The kidney showed the major potential for aerobic ATP-generating pathway and argininolytic capacity. High levels of CS and MDH activities indicated that renal tissue can be involved in activities that require a lot of energy such as excretion of metabolic end products, amino acids catabolism or even gluconeogenic activities related to inter-tissue metabolism. The fact that kidneys are the main site for arginase activity is very unusual for mollusks and could be related to the living habits of L. elliptica. Genetic expression of the L. elliptica renal arginase could be controlling the levels of l-arginine and forming urea in the excretory organ, which may not have its physiological functions directly affected by the seasonal retraction of its siphons. Compared to the bivalve Dreissena polymorpha, renal arginase of L. elliptica is more resistant to inhibition by copper and cadmium. This could be related to naturally high levels of these metals in the Antarctic marine environment and its bioaccumulation in the renal tissue of L. elliptica, as a probable advantage to its environmental adaptation. Different from other Antarctic animals that feed on Krill, the arginase of L. elliptica is much more sensitive to fluoride inhibition. However, diet composition of L. elliptica would be expected to be variable site to site and its high sensitivity to fluoride inhibition may be a matter of concern in areas near ornithogenic soils subjected to ice-melting processes.[Rodrigues, Edson; da Silva Santos, Marcela Rosana; Rodrigues Junior, Edson; Gannabathula, Vani] Universidade de Taubaté (Unitau), Biochem Lab, Basic Inst Biosci, BR-12030180 Taubate, SP, Brazil[Lavrado, Helena Passeri] Univ Fed Rio de Janeiro, UFRJ, CCS, BR-21949900 Rio De Janeiro, Brazi
Interactions of temperature, salinity and diesel oil on antioxidant defense enzymes of the limpet Nacella concinna
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Previous issue date: 2015Ministério do Meio Ambiente (MMA)Ministério da Ciência, Tecnologia e Inovação (MCTI)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Secretariat of the Inter-ministerial Commission for the Resources of the Sea (SeCIRM)Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)Instituto Nacional de Ciência e Tecnologia Antártico de Pesquisas Ambientais (INCT-APA)The intertidal and subtidal environments in the Antarctic Peninsula are vulnerable to pollutants, such as diesel oil, a commonly used fuel. Nacelle concinna is capable of accumulating polycyclic aromatic hydrocarbons and is a potential biomonitor of diesel oil contamination. This work investigates the interaction of diesel oil, temperature and salinity on the activity of antioxidants enzymes defense of the gills, foot muscle and digestive glands. Upregulation of superoxide dismutase occurred in the three tissues by warming. The foot muscle catalase and the gill glutathione reductase were upregulated only by diesel. The inability to upregulate catalase and glutathione S-transferase in the digestive gland, as well as the increase of lipoperoxidation, suggested that this gland is more susceptible to the deleterious effects from oxidative stress. (C) 2015 Elsevier Ltd. All rights reserved.[de Oliveira, Mariana Feijo; Rodrigues Junior, Edson; Donatti, Lucelia] Univ Fed Parana, Dept Cell Biol, BR-81530130 Curitiba, Parana, Brazil[de Oliveira, Mariana Feijo; Rodrigues Junior, Edson; Suda, Cecilia N. K.; Vani, Gannabathula S.; Rodrigues, Edson] Universidade de Taubaté (Unitau), Basic Biosci Inst, BR-12030180 Taubate, SP, Brazil[Lavrado, Helena P.] Univ Fed Rio de Janeiro, Dept Marine Biol, BR-21941902 Rio De Janeiro, RJ, Brazi
Temas atuais de direito das famílias
No full text- Divulgação dos SUMÁRIOS das obras recentemente incorporadas ao acervo da Biblioteca Ministro Oscar Saraiva do STJ. Em respeito à Lei de Direitos Autorais, não disponibilizamos a obra na íntegra.- Localização na estante: 347.6(81) T278d- Walsir Edson Rodrigues Júnior é coordenador da obra
Metabolic responses of the Antarctic fishes Notothenia rossii and Notothenia coriiceps to sewage pollution
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Previous issue date: 2015Ministério do Meio Ambiente (MMA)Ministério da Ciência, Tecnologia e Inovação (MCTI)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Secretariat of the Inter-ministerial Commission for the Resources of the Sea (SeCIRM)Instituto Nacional de Ciência e Tecnologia Antártico de Pesquisas Ambientais (INCT-APA)Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)The present study aimed to assess the sewage effects of the Brazilian Antarctic Station Comandante Ferraz, Admiralty Bay, King George Island, on the hepatic metabolism (energetic, antioxidant, and arginase levels) and levels of plasma constituents of two Antarctic fish species Notothenia rossii and N. coriiceps. The bioassays were conducted under controlled temperature (0 degrees C) and salinity (35 psu), exposing the fish for 96 h, to sewage effluent diluted in seawater to 0.5 % (v/v). Liver homogenates were tested for the specific activities of the enzymes glucose-6-phosphatase (G6Pase), glycogen phosphorylase (GPase), hexokinase, citrate synthase, lactate dehydrogenase, malate dehydrogenase, glucose-6-phosphate dehydrogenase, superoxide dismutase, glutathione reductase, catalase, and arginase. Plasma levels of glucose, triacylglycerides, cholesterol, total protein, albumin, chloride, magnesium, calcium, and inorganic phosphate were also determined. In N. rossii, the decrease in citrate synthase and the increase in G6Pase and GPase suggested that the sewage effluent activated glycogenolysis and hepatic gluconeogenesis, whereas is N. coriiceps, only G6Pase levels were increased. In N. rossii, sewage effluent induced hypertriglyceridemia without modulating glucose plasma levels, in contrast to N. coriiceps, which developed hypoglycemia without elevating plasma triglyceride levels. The decrease in glutathione reductase levels in N. coriiceps and in superoxide dismutase and catalase in N. rossii suggest that these two species are susceptible to oxidative stress stemming from the production of reactive oxygen species. An increase in magnesium in N. rossii and a decrease in N. coriiceps showed that sewage effluent compromised the control of plasma levels of this cation. Although phylogenetically close, both species of Antarctic fish exhibited different metabolic responses to the sewage effluent, with N. coriiceps showing greater susceptibility to the toxic effects of the pollutants. The present study suggests that the biochemical responses of these two species are potential indicators of metabolic changes caused by sewage effluents.[Rodrigues, Edson, Jr.; Feijo-Oliveira, Mariana; Kawagoe Suda, Cecilia Nohome; Vani, Gannabathula Sree; Rodrigues, Edson] Universidade de Taubaté (Unitau), Inst Basic Biosci, BR-12030180 Taubate, SP, Brazil[Donatti, Lucelia] Univ Fed Parana, Dept Cell Biol, BR-81530130 Curitiba, PR, Brazil[Lavrado, Helena Passeri] Univ Fed Rio de Janeiro, Dept Marine Biol, BR-21941902 Rio De Janeiro, RJ, Brazi
Evidence of metabolic microevolution of the limpet Nacella concinna to naturally high heavy metal levels in Antarctica
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Previous issue date: 2017Ministério do Meio Ambiente (MMA)Ministério da Ciência, Tecnologia e Inovação (MCTI)Secretaria da Comissão Interministerial para os Recursos do Mar (SECIRM)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)The gastropod Nacella concinna is the most conspicuous macroinvertebrate of the intertidal zone of the Antarctic Peninsula and adjacent islands. Naturally high levels of copper and cadmium in coastal marine ecosystems are accumulated in N. concinna tissues. We aimed to study the effects of metal cations on N. concinna arginase in the context of possible adaptive microevolution. Gills and muscle had the highest argininolytic activity, which was concentrated in the cytosol in both tissues. Gills had the highest levels of arginase and may be involved in the systemic control of L-arginine levels. The relatively high argininolytic activity of the N. concinna muscular foot, with K-M = 25.3 +/- 3.4 mmol L-1, may be involved in the control of L-arginine levels during phosphagen breakdown. N. concinna arginases showed the following preferences for metal cations: Ni2+ > Mn2+ > Co2+ > Cu2+ in muscle and Mn2+ > Cu2+ in gills. Cu2+ activation is a unique characteristic of N. concinna arginases, as copper is a potent arginase inhibitor. Cu2+ partly neutralized N. concinna arginase inhibition by Cd2+, worked synergistically in muscle arginase activation by Co2+ and neutralized muscle arginase activation by Ni2+. Mn2+ was able to activate muscle arginase in the presence of Fe3+ and Pb2+. The selection of arginases that are activated by Cu2+ and resistant to inhibition by Cd2+ in the presence of Cu2+ over evolutionary timescales may have favored N. concinna occupation of copper- and cadmium-rich niches. (C) 2016 Elsevier Inc. All rights reserved.[de Oliveira, Mariana Feijo; Rodrigues Junior, Edson; Kawagoe Suda, Cecilia Nahomi; Vani, Gannabathula Sree; Rodrigues, Edson] Universidade de Taubaté (Unitau), Basic Biosci Inst[Donatti, Lucelia] Univ Fed Parana, Dept Cell Biol, Curitiba, Parana, Brazil[Lavrado, Helena Passeri] Univ Fed Rio de Janeiro, Dept Marine Biol, Rio De Janeiro, Brazi
Apresentação: 35 anos de Teoria da Metáfora Conceptual Fundamentos, problemas e novos rumos
No full textTexto de apresentação da edição temática “35 anos de Teoria da Metáfora Conceptual. Fundamentos, problemas e novos rumos.” Texto produzido pelos organizadores, os professores doutores Augusto Soares da Silva, da Universidade de Braga, e Jan Edson Rodrigues Leite, da Universidade Federal da Paraíba
O efeito da salinidade sobre a osmoregulação e o desenvolvimento do juvenil de robalo-peva, Centropomus parallelus (POEY)
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Previous issue date: 2013Peixes eurihalinos suportam águas com diferentes concentrações de sal. Contudo, muitos estudos têm mostrado que a salinidade pode afetar o desenvolvimento do peixe. Portanto, o efeito da mudança de salinidade de 20 para 5 e 35 na taxa de sobrevivência, peso, comprimento, morfologia das células de cloreto branquiais e atividade da Na+, K+ ATPase foram avaliadas no Centropomus parallelus após curto (6, 24 e 96 horas) e longo tempo de exposição (30 e 60 dias). A salinidade não afetou a sobrevivência, o peso e comprimento final do robalo-peva. A quantidade de células de cloreto aumentou visivelmente nas salinidades 5 e 35, exibindo morfologias típicas de células que absorvem e secretam sal, respectivamente. A atividade da Na+, K+ ATPase nas brânquias do C. parallelus foi significativamente maior na salinidade 5 do que nas salinidades 20 ou 35 após 96 horas, mas não após 30 e 60 dias. Esses resultados indicam que a mudança de alta para baixa salinidade provoca adaptações nas células de cloreto e na atividade da Na+, K+ ATPase branquial em curto prazo. Contudo, após longa exposição na salinidade 5, a alta atividade da Na+, K+ ATPase branquial não é mais necessária. O aumento de salinidade para 35 não induz mudanças significativas nas brânquias. Portanto, juvenis de C. parallelus possuem a capacidade de aclimatação nas salinidades de 5 a 35 semefeitos significativos no desenvolvimento após 60 dias.Eurihaline fish support waters with different salt concentration. However, numerous studies have shown that salinity can affect fish development. Thus, the effect of salinity change from 20 to 5 and 35 on survival, weight, length, gill chloride cell ultrastructure and gill Na+, K+ ATPase activity was evaluated in Centropomus parallelus following short-term (6, 24 and 96 hours) and long-term exposure (30 and 60 days). Salinity did not affect C. parallelus survival, final weight and length. The quantity of chloride cells increased visibly at salinities of 5 and 35, with the cells exhibiting the typical features of uptake and secretory cells, respectively. Na+, K+ ATPase activity in the gill of the C. parallelus was significantly greater at a salinity of 5 than at a salinity of 20 or 35 after 96 hours, but not after 30 or 60 days. These results indicate that salinity change from high to low salt water induces gill chloride cell and Na+, K+ ATPase activity adaptations after short-term exposure. However, after long-term exposure at salinity 5, gill Na+, K+ ATPase activity is no more necessary at high levels. The increase in salinity to 35 does not induce significant change in gills. Juveniles of C. parallelus may thus be capable of acclimating to salinities of 5 to 35 for 60 days without significant effects on development.[Rodrigues, E.] Universidade de Taubaté, BrazilSterzelecki, FC.; Fanta, E.; Ribeiro, CAO.] Universidade Federal do Paraná, Brazi
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The general exception clauses of the TRIPS agreement ::promoting sustainable development /
No full textThe general exception clauses of the TRIPS Agreement of the World Trade Organization permit exceptions to copyrights and to the rights conferred by trademarks, industrial designs and patents. These clauses are intended to facilitate access to diverse forms of proprietary knowledge and therefore foster the interdependent pillars of sustainable development: economic progress, realization of human rights and the conservation of the environment. In this book, Edson Beas Rodrigues, Jr argues that the TRIPS Agreement, in its current configuration, does not hinder the establishment of exceptions to intellectual property rights, devised to promote vital socioeconomic interests such as the freedom to carry out creative and inventive activities, freedom of expression, the strengthening of free competition, and increased access to educational materials by underprivileged students and to technical knowledge for humanitarian purposes
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No full textAula-teatro terr@. Pesquisa: Acácio Augusto, Aline Passos, Anamaria Salles, Beatriz Scigliano Carneiro, Cecília Oliveira, Edson Passetti, Eliane Knorr, Gustavo Ramus, Gustavo Simões, Leandro Siqueira, Luíza Uehara, Mauricio Freitas, Salete Oliveira, Sofia Osório e Thiago Rodrigues. Apresentação em 25 e 26 de outubro de 2010, reapresentação na programação de recepção aos novos calouros da Faculdade de Ciências Sociais da PUC-SP, no dia 24 de fevereiro de 2011. O texto aqui publicado se refere à apresentação de 26 de outubro de 2010. Com: Acácio Augusto, Aline Passos, Anamaria de Aguiar e Salles (Ana), Andre Degenszajn, Beatriz Scigliano Carneiro (Bia),Cecília Oliveira, Eliane Knorr (Lili), Gustavo Ramus (Cabelo), GustavoSimões (Gus), Joana Egypto (convidada), Salete Oliveira, Sofia Osório, TalitaVinagre (convidada) e Thiago Rodrigues. Produção gráfica: Andre Degenszajn.Operadora de luz: Anamaria de Aguiar e Salles. Operadora de som: LuízaUehara. Assistências: Leandro Siqueira. Sonofonia: Vitor Osório (convidado).Preparação corporal: Joana Egypto e Talita Vinagre (convidadas). Textoe trilha musical: Acácio Augusto e Edson Passetti. Coordenação e ambientação:Edson Passetti
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