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Mostrando 25-36 de 2773 artigos, teses e dissertações.
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25. Development of a Simple and Fast Procedure Based on Acid Dilution for Determination of Macro and Microelements in Guarana-Based Beverages by ICP OES
A simple analytical procedure is proposed for the direct analysis of guarana-based beverages in order to determine nutrient elements by inductively coupled plasma optical emission spectrometry (ICP OES). A Box-Behnken design, combined with Derringer’s desirability function, was applied to the simultaneous optimization of the ICP OES radiofrequency (RF), sa
J. Braz. Chem. Soc.. Publicado em: 2021-07
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26. Ferrimagnetic to paramagnetic transition and dielectric relaxation in Ni1-xZnxFe2O4 ferrites
Abstract The spinel ferrite system Ni1-xZnxFe2O4 (x=0-0.7, Δx=0.1) was prepared by wet chemical co-precipitation method using sulfates of respective metal ions. The electrical resistivity and dielectric properties of the prepared samples have been studied as a function of temperature, frequency, and Zn content (x). The DC resistivity (ϱ) was measured in th
Cerâmica. Publicado em: 2021-06
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27. Nutrient content in ora-pro-nóbis (Pereskia aculeata Mill.): unconventional vegetable of the Brazilian Atlantic Forest
Abstract Ora-pro-nóbis (Pereskia aculeata Mill.) is an unconventional vegetable found in the Brazilian Atlantic Forest and consumed, mainly by the rural population who lives in this biome. The present study investigated the nutritional value and contribution potential this species to the recommendations of daily nutrient intake for adults. Moisture and ash
Food Sci. Technol. Publicado em: 2021-06
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28. Physicochemical, bioactive properties and antioxidant of Apis mellifera L. honey from western Paraná, Southern Brazil
Abstract The Southern region of Brazil is known for its floral diversity, presenting great potential for bee products such as honey, pollen, propolis and royal jelly. In this study, 67 honey samples provided by beekeepers from 14 municipalities of western Paraná were evaluated. Physicochemical parameters, bioactive compounds and antioxidant activity were an
Food Sci. Technol. Publicado em: 2021-06
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29. DOSES DE GESSO E POTÁSSIO NO ESTADO NUTRICIONAL E PRODUÇÃO DE COUVE-FLOR
RESUMO O gesso é utilizado na agricultura para o fornecimento de nutrientes ao sistema solo-planta, aumento da profundidade do sistema radicular das culturas e, também, para mitigar os efeitos do estresse hídrico nas plantas. No entanto, seu uso indiscriminado pode levar à redução do conteúdo de nutrientes catiônicos da superfície do solo, principal
Rev. Caatinga. Publicado em: 2021-06
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30. Thallium Associated with Manganese Ore Tailings in a Deactivated Mine in the Western Region of Bahia, Brazil
Thallium (Tl) is a rare metal with toxic effects notably harmful to human health and the environment. In this article, the natural occurrence of Tl was evaluated in a deactivated manganese mine located in the western region of Bahia, Brazil. The extraction procedure with aqua regia was used to dissolve the soil, sediment, and tailings samples. The Tl content
J. Braz. Chem. Soc.. Publicado em: 2021-05
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31. EFEITO DO HG2+ E DOS ÍONS CU2+, FE2+, NI2+, SN2+ E ZN2+ NA ESTABILIDADE DE NANOPARTÍCULAS DE PRATA: UMA PRÁTICA INTERDISCIPLINAR DE NANOTECNOLOGIA EXPERIMENTAL
The growing predominance of nanoscience and nanotechnology makes it increasingly important that these topics become an integral part of all scientific education. For this reason, in the present work, an interdisciplinary experiment of nanotechnology is introduced. As silver nanoparticles (AgNPs) are the most applied nanomaterial in consumer products, the cur
Quím. Nova. Publicado em: 2021-04
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32. Adubação com esterco ovino em Mimosa caesalpiniifolia em um Planossolo
RESUMO O uso de adubos orgânicos pode incrementar a produção de espécies florestais, as quais podem ser usadas para extração de madeira em monocultivos ou em sistemas integrados. Objetivou-se neste estudo, avaliar a aplicação de doses de esterco de ovino na implantação de Mimosa caesalpiniifolia (sabiá) em sistema silviagrícola, de uma área ante
Rev. bras. eng. agríc. ambient.. Publicado em: 2021-04
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33. Metal Distribution in the Environmental Compartments of Manguaba Lagoon (Alagoas State, Brazil)
The metal concentrations in water, sediments and mollusks (Tagelus plebeius) of the Manguaba Lagoon and the influence of humic substances from water and sediments in the distribution of these metals were investigated in this work. The mean metal concentrations in water were: Mg (89.0 ± 0.11), Ca (32.0 ± 0.10), Fe (0.97 ± 0.02), Mn (0.52 ± 0.01), Zn (0.33
J. Braz. Chem. Soc.. Publicado em: 2021-03
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34. Modelos baseados em variáveis meteorológicas para estimar o progresso epidêmico do bacteriose de noz em variedades de comportamento diferente
RESUMO A bacteriose da nogueira é causada por Xanthomonas arboricola pv. juglandis. Em Zavalla (Santa Fe), o cultivo da nogueira concentra-se na produção de plantas enxertadas em viveiro. O objetivo deste trabalho foi quantificar o efeito do ambiente no desenvolvimento epidêmico da bacteriose da nogueira em variedades susceptíveis e de melhor comportame
Summa phytopathol.. Publicado em: 2021-03
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35. Occurrence of leaf blast on white oats, Italian ryegrass and wheat in Southern Brazil
RESUMO A bacteriose da nogueira é causada por Xanthomonas arboricola pv. juglandis. Em Zavalla (Santa Fe), o cultivo da nogueira concentra-se na produção de plantas enxertadas em viveiro. O objetivo deste trabalho foi quantificar o efeito do ambiente no desenvolvimento epidêmico da bacteriose da nogueira em variedades susceptíveis e de melhor comportame
Summa phytopathol.. Publicado em: 2021-03
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36. Spatial Distribution and Pollution Assessment of Trace Elements Pb, Cu, Ni, Fe and As in the Surficial Water of Staring Bay, Indonesia
Staring Bay has long been used by the local community for fisheries and fishing activities; however, the rapid population growth and industrial activities around the bay in recent years are predicted to contribute significantly to the increase of waste entering the bay. This particular study was aimed to provide baseline levels of trace elements Pb, Cu, Ni,
J. Braz. Chem. Soc.. Publicado em: 2021-02