Selenate
Mostrando 1-12 de 64 artigos, teses e dissertações.
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1. Biological Synthesis of Selenium Nanoparticles and Evaluation of their Bioavailability
ABSTRACT Nanoparticles due to their unique properties have attracted more attention and their bacterial biosynthesis is more favorable because is environmental friendly and the size and yield of nanoparticles can be optimized. The aim of the present study was biosynthesis of Selenium nanoparticles using Bacillus cereus. For this purpose, bacterial culture wa
Braz. arch. biol. technol.. Publicado em: 14/06/2018
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2. Effect of Selenite and Selenate Application on Mineral Composition of Lettuce Plants Cultivated Under Hydroponic Conditions: Nutritional Balance Overview Using a Multifaceted Study
The effect of selenate and selenite enrichment on mineral composition of a red type of lettuce cv. “Veneza roxa” was evaluated using inductively coupled plasma-optical emission spectroscopy (ICP OES), molecular modeling and principal component analysis (PCA). Both Se species did not show toxicity, while selenate promoted the greatest Se accumulation by t
J. Braz. Chem. Soc.. Publicado em: 2018-02
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3. EFECTOS DEL ENRIQUECIMIENTO CON SELENIO EN SPAD, CALIDAD DE LA FRUTA Y PARÁMETROS DE CRECIMIENTO DE PLANTAS DE FRESA EN UN SISTEMA DE CULTIVO SIN SUELO
ABSTRACT Selenium (Se) is an essential trace element for animals, plants, microorganisms and human health. Thus, it appears that increasing amounts of Se in plants could have positive implications. The aim of our study was to evaluate the influence of foliar and substrate application of selenite (Se IV) and selenate (Se VI) on weight, fruit quality, growth
Rev. Bras. Frutic.. Publicado em: 2016-02
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4. Bioforticação agronômica com selênio em arroz / Agronomic biofortification with selenium in rice
O selênio (Se) é considerado essencial para humanos e animais por fazer parte de uma série de reações químicas e possuir propriedades antioxidantes. Dietas deficientes em Se estão associadas com problemas de saúde. Sendo assim, espera-se com a biofortificação com Se, minimizar os problemas relacionados a essas deficiências, e a escolha de culturas
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/09/2011
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5. Selenium quantity in brasilian soils and plants, and selenium application in different forages / Levantamento sobre selênio em solos e plantas do Brasil e sua aplicação em plantas forrageiras
High Selenium (Se) concentrations in soil are reported in some places around the world. Deficiencies in grasses were observed in São Paulo´s state areas, probably associated with soil´s quantity of Selenium. Some countries correct this deficiency through of fertilization. Se is essential to animals and its deficiency causes diseases. Se essentiality in pl
Publicado em: 2009
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6. Reduction of Selenate to Selenide by Sulfate-Respiring Bacteria: Experiments with Cell Suspensions and Estuarine Sediments
Washed cell suspensions of Desulfovibrio desulfuricans subsp. aestuarii were capable of reducing nanomolar levels of selenate to selenide as well as sulfate to sulfide. Reduction of these species was inhibited by 1 mM selenate or tungstate. The addition of 1 mM sulfate decreased the reduction of selenate and enhanced the reduction of sulfate. Increasing conc
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7. Nitrate Is a Preferred Electron Acceptor for Growth of Freshwater Selenate-Respiring Bacteria
An anaerobic, freshwater enrichment grew with either nitrate or selenate as an electron acceptor. With both ions present, nitrate reduction preceded selenate reduction. An isolate from the enrichment grew on either ion, but the presence of nitrate precluded the reduction of selenate. Stock cultures of denitrifiers grew anaerobically on nitrate but not on sel
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8. Overexpression of ATP Sulfurylase in Indian Mustard Leads to Increased Selenate Uptake, Reduction, and Tolerance1
In earlier studies, the assimilation of selenate by plants appeared to be limited by its reduction, a step that is thought to be mediated by ATP sulfurylase. Here, the Arabidopsis APS1 gene, encoding a plastidic ATP sulfurylase, was constitutively overexpressed in Indian mustard (Brassica juncea). Compared with that in untransformed plants, the ATP sul
American Society of Plant Physiologists.
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9. Rate-Limiting Steps in Selenium Assimilation and Volatilization by Indian Mustard1
Se can be accumulated by plants and volatilized to dimethylselenide, providing an attractive technology for Se phytoremediation. To determine the rate-limiting steps in Se volatilization from selenate and selenite, time- and concentration-dependent kinetics of Se accumulation and volatilization were studied in Indian mustard (Brassica juncea). Time-dep
American Society of Plant Physiologists.
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10. Selenate reduction by bacteria from a selenium-rich environment.
Samples collected from Kesterson Reservoir were screened for bacterial presence and selenate reduction capability. Selenate concentrations of 100 mg/liter were not toxic to indigenous bacteria. Of the 44 samples collected, 20 possessed microbial populations capable of reducing selenate. Reduction was observed in 4% of the water samples, 92% of the sediment s
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11. Derepression of ATP sulfurylase by the sulfate analogs molybdate and selenate in cultured tobacco cells.
Molybdate and selenate are structural analogs of sulfate that inhibit synthesis of adenosine 5'-phosphosulfate by ATP sulfurylase (sulfate adenylyltransferase, ATP:sulfate adenylyltransferase, EC 2.7.7.4) in crude extracts of tobacco XD cells. Both of these anions derepress ATP sulfurylase in cells growing on sulfate, but not in cells growing on L-cysteine.
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12. Isolation, Growth, and Metabolism of an Obligately Anaerobic, Selenate-Respiring Bacterium, Strain SES-3
A gram-negative, strictly anaerobic, motile vibrio was isolated from a selenate-respiring enrichment culture. The isolate, designated strain SES-3, grew by coupling the oxidation of lactate to acetate plus CO2 with the concomitant reduction of selenate to selenite or of nitrate to ammonium. No growth was observed on sulfate or selenite, but cell suspensions