Open Top Chambers
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Carbon dioxide-enriched atmosphere enhances biomass accumulation and meristem production in the pioneer shrub Baccharis dracunculifolia (Asteraceae)
The increase in atmospheric CO2 concentration predicted to the end of this century may cause several alterations on plant species development, which shall result in changes in the structure and function of plant communities. The present work aimed to investigate the effects of the increase in atmospheric CO2 concentration on the development of Baccharis drac
Acta Bot. Bras.. Publicado em: 2014-12
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2. Composição química dos grãos e da cera foliar de variedade Glycine max (L.) Merrill cv. MG/ BR-46 Conquista cultivada sob atmosfera enriquecida de gás carbônico e temperatura elevada
The concentration of carbon dioxide (CO2) has increased in the last decades, due mainly to the combustion of fossil fuels. A gradual increase of the global temperature is expected as a consequence. Soybean is an important crop in most countries, being consumed either as human or domestic animals food. The present work is composed of two chapters, the first d
Publicado em: 07/02/2014
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3. Impacto do aumento da concentração de CO2 atmosférico sobre a ferrugem asiática e o desenvolvimento de plantas de soja.
Resumo: A concentração de dióxido de carbono (CO2) na atmosfera tem aumentado significativamente nas últimas décadas e as previsões indicam que os valores atuais podem dobrar até o final do século. O presente estudo teve por objetivo avaliar o efeito do aumento da concentração de CO2 atmosférico na severidade da ferrugem asiática da soja, causada
Jaguariúna: Embrapa meio Ambiente. Publicado em: 2011
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4. Potencial bioindicador de cultivares de feijão (Phaseolus vulgaris L.) para o monitoramento do ozônio troposférico
O ozônio troposférico (O3) é um dos poluentes mais importantes da atualidade, sendo formado pela interação de óxidos de nitrogênio, hidrocarbonetos e radiação ultravioleta. Ele ou seus radicais livres estão associados ao aumento da incidência de doenças pulmonares em seres humanos, além de causar danos à vegetação e à produtividade agrícola
Publicado em: 2008
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5. Influence of elevated CO2 atmosphere, nitric oxida and fungai elicitors on production of phytoalexins in soyobean seedlings / Influencia de atmosfera enriquecida em CO2, do radical oxido nitrico e de eliciadores fungicos na produção de fitoalexinas em plantulas de soja
Soybean seedlings (Glycine max L. Merr) grown in open top chambers under high CO2 concentrations have shown photosynthetic increment and increase in productivity, which in turn may modify the productio n of secondary metabolites with farmacological importance. The aim of this work was to analyze the synthesis of flavones, isoflavones and pterocarpans in soyb
Publicado em: 2007
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6. Câmara de Topo Aberto, CTA: construção e uso para observação de potencial tóxico da poluição atmosférica urbana com bioensaios em plantas / Open Top Chamber : erection and use for toxicological evaluation of urban air pollution using plants bioassay
A Câmara de Topo Aberto, CTA, foi adaptada para gerar um gradiente da concentração da poluição atmosférica ambiente por material particulado fino, capaz de ser utilizado em experimentos toxicológicos. Uma vez que os aerossóis urbanos são composições quimicamente complexas, com comprovada toxicidade na saúde e mecanismos de ação sobre o homem ai
Publicado em: 2007
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7. Estudo bioquimico e da estrutura foliar de plantulas do jatoba da mata (Hymenaea courbaril L.) e do cerrado (Hymenaea stigonocarpa Mart.) expostas a concentração elevada de C O IND. 2 / Structural and biochemical study of leaves of jatobas Hymenaea coutbaril L. and H. stigonocarpa Mart. exposed to elevated concentrations of carbon dioxide atmosphere
The atmospheric concentration of carbon dioxide (CO2) increased from 280 ppm, during the Industrial Revolution period, to about 370 ppm in the nowadays. It is continuing to increase about 1.8 ppm per year. The effect of this rise in CO2, which is leading to global warming have attracted considerable attention, generating reports on how these changes can affe
Publicado em: 2007
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8. Modelagem e controle de CO2 em câmaras de topo aberto utilizadas em estudos de fisiologia vegetal. / Modelling and control of CO2 in open-top chambers used on vegetal physiology researches.
As atividades sócio-econômicas vêm provocando alterações nocivas ao meio ambiente que atualmente assumem proporções mundiais. Graças à maciça utilização de combustíveis fósseis para a geração de energia e às crescentes práticas de desmatamento e queimadas das florestas, a concentração de dióxido de carbono (CO2) na atmosfera vem aumentan
Publicado em: 2006
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9. Effects of Ozone and Sulfur Dioxide on Phyllosphere Fungi from Three Tree Species
Short-term effects of ozone (O3) on phyllosphere fungi were studied by examining fungal populations from leaves of giant sequoia (Sequoiadendron giganteum (Lindl.) Buchholz) and California black oak (Quercus kelloggii Newb.). Chronic effects of both O3 and sulfur dioxide (SO2) were studied by isolating fungi from leaves of mature Valencia orange (Citrus sine
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10. CO2 Exchange and Growth of the Crassulacean Acid Metabolism Plant Opuntia ficus-indica under Elevated CO2 in Open-Top Chambers.
CO2 uptake, water vapor conductance, and biomass production of Opuntia ficus-indica, a Crassulacean acid metabolism species, were studied at CO2 concentrations of 370, 520, and 720 [mu]L L-1 in open-top chambers during a 23-week period. Nine weeks after planting, daily net CO2 uptake for basal cladodes at 520 and 720 [mu]L L-1 of CO2 was 76 and 98% higher, r
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11. Influence of Elevated CO2 on the Fungal Community in a Coastal Scrub Oak Forest Soil Investigated with Terminal-Restriction Fragment Length Polymorphism Analysis
Sixteen open-top chambers (diameter, 3.66 m) were established in a scrub oak habitat in central Florida where vegetation was removed in a planned burn prior to chamber installation. Eight control chambers have been continuously exposed to ambient air and eight have been continuously exposed to elevated CO2 at twice-ambient concentration (∼700 ppm) for 5 ye
American Society for Microbiology.
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12. Does Long-Term Elevation of CO2 Concentration Increase Photosynthesis in Forest Floor Vegetation? (Indiana Strawberry in a Maryland Forest).
As the partial pressure of CO2 (pCO2) in the atmosphere rises, photorespiratory loss of carbon in C3 photosynthesis will diminish and the net efficiency of light-limited photosynthetic carbon uptake should rise. We tested this expectation for Indiana strawberry (Duchesnea indica) growing on a Maryland forest floor. Open-top chambers were used to elevate the