Search Results - "Nóbrega, J.A."

Focused microwave-induced combustion for digestion of botanical samples and metals determination by ICP OES and ICP-MS by Barin, J.S., Pereira, J.S.F., Mello, P.A., Knorr, C.L., Moraes, D.P., Mesko, M.F., Nóbrega, J.A., Korn, M.G.A., Flores, E.M.M.

“…► A high sample mass, up to 3g was completely digested improving the limits of detection (LOD) in relation to the microwave-assisted wet digestion. ► Using…”
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Proton and metal binding capacity of the green freshwater alga Chaetophora elegans by Andrade, A.D., Rollemberg, M.C.E., Nóbrega, J.A.

“…A biomass for removing heavy metal ions from aqueous solutions has been investigated. The green alga Chaetophora elegans was characterized in terms of the…”
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Indium(I) bromide-mediated dichlorocyanomethylation of carbonyl compounds. The preparation of 2,2-dichloro-3-hydroxynitriles by Nóbrega, J.A, Gonçalves, Simone M.C, Peppe, C

“…Carbonyl compounds were efficiently transformed into their corresponding 2,2-dichloro-3-hydroxynitrile derivatives by the action of trichloroacetonitrile and…”
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Microwave-assisted digestion of organic samples: How simple can it become? by Nóbrega, J.A., Pirola, C., Fialho, L.L., Rota, G., de Campos Jordão, C.E.K.M.A., Pollo, F.

“…Advancements in sample preparation for performing trace analysis of inorganic analytes are coming from the dissemination of microwave-assisted procedures, but…”
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Equilibrium studies for the sorption of chromium and nickel from aqueous solutions using raw rice bran by Oliveira, E.A., Montanher, S.F., Andrade, A.D., Nóbrega, J.A., Rollemberg, M.C.

“…The capacity of raw rice bran for chromium and nickel removal from aqueous solutions was investigated. The Langmuir and Freundlich adsorption models, which are…”
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Double tungsten coil atomic absorption spectrometer based on an acousto-optic tunable filter by Jora, M.Z., Nóbrega, J.A., Rohwedder, J.J.R., Pasquini, C.

“…An atomic absorption spectrometer based on a quartz acousto-optic tunable filter (AOTF) monochromator operating in the 271–453nm range, is described. The…”
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Indium(I) bromide-mediated bromocyanomethylation of carbonyl compounds by Nóbrega, J.A., Gonçalves, Simone M.C., Peppe, C.

“…Bromocyanomethylation of a variety of carbonyl compounds to produce the corresponding 2-bromo-3-hydroxynitriles has been achieved in moderate to good yields by…”
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Focused microwave-assisted acid digestion of oils: an evaluation of the residual carbon content by Costa, L.M., Silva, F.V., Gouveia, S.T., Nogueira, A.R.A., Nóbrega, J.A.

“…A focused-microwave oven was applied for acid digestion of oil samples. The aim was to evaluate the efficiency of the decomposition performed on a system with…”
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Enhancement of the luminescence intensity by co-doping Mn2+ into Er3+-doped SrAl2O4 by de Herval, L.K.S., Tuncer Arslanlar, Y., Ayvacikli, M., Iikawa, F., Nobrega, J.A., Pizani, P.S., Galvão Gobato, Y., Can, N., Henini, M., de Godoy, M.P.F.

“…Structural and optical properties of erbium- and manganese-doped strontium aluminates (SrAl2O4) phosphor materials synthesized by a solid state reaction were…”
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ACUTE INTOXICATIONS IN THE DISTRICT GENERAL HOSPITAL EMERGENCY DEPARTMENT DURING A 6 YEAR PERIOD by Jardim, M, Silva, A.S, Granito, S, Freitas, J.M, Gaspar, J, Silva, S, Brazão, M.L, Chaves, A, Freitas, D, Vieira, R, Nóbrega, J.A

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Determination of cadmium and lead in mussels by tungsten coil electrothermal atomic absorption spectrometry by Bruhn, C.G., San Francisco, N.A., Neira, J.Y., Nóbrega, J.A.

“…In this work it was evaluated the determination of Cd and Pb in mussels by tungsten coil electrothermal atomic absorption spectrometry (TCA-AAS). A critical…”
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Simple and efficient elimination of copper(II) in sugar-cane spirits by Neves, Eduardo Almeida, Oliveira, Andrea, Fernandes, Andréa Pires, Nóbrega, Joaquim A.

“…Cachaça is a distilled alcoholic beverage, produced in large quantities in Brazil, from fermentation of sugar cane juice. It is normally distillated in copper…”
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Direct determination of chromium in gelatine by graphite furnace atomic absorption spectrophotometry by QUINAIA, S. P, NOBREGA, J. A

“…A fast and direct method for the determination of Cr in gelatine using graphite furnace atomic absorption spectrophotometry with Zeeman-effect background…”
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Polaronic ferromagnetism in conducting polymers by Pereira, E.C, Correa, A.A, Bulhões, L.O.S, Aleixo, P.C, Nóbrega, J.A, de Oliveira, A.J.A, Ortiz, W.A, Walmsley, L

“…Ferromagnetic behavior at room temperature is reported in metal-free-conducting polymer samples of poly(3-methylthiophene) doped with ClO 4 −. Magnetic moments…”
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Determination of selenium in nutritionally relevant foods by graphite furnace atomic absorption spectrometry using arsenic as internal standard by Oliveira, Adriana Paiva, Neto, José Anchieta Gomes, Nóbrega, Joaquim Araújo, Correia, Paulo Rogério Miranda, Oliveira, Pedro Vitoriano

“…A method has been developed for the direct determination of Se in nutritionally relevant foods by graphite furnace atomic absorption spectrometry…”
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Dilute-and-shoot procedure for the determination of mineral constituents in vinegar samples by axially viewed inductively coupled plasma optical emission spectrometry (ICP OES) by Da Silva, J C J, Cadore, S, Nobrega, J A, Baccan, N

“…Samples of commercial wine vinegar were introduced in an axially viewed inductively coupled plasma optical emission spectrometry instrument (AX-ICP OES)…”
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High-Throughput Microwave-Assisted Digestion and Extraction Procedures for Agricultural Materials by Nobrega, J.A, Nascentes, C.C, Araujo, G.C.L, Nogueira, A.R.A, Pirola, C

“…Despite the advances in microwave-assisted procedures, the sample throughput still remains a critical problem that requires the development of reactor vessels,…”
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Multi-element determination in acid-digested soy protein formulations by inductively coupled plasma-optical emission spectrometry by Morte, Elane S. Boa, Costa, Letícia M., Nóbrega, Joaquim A., Korn, Maria das Graças A.

“…The concentrations of major (Ca, K, Mg, Na and P) and trace elements (Al, Cu and Fe) in soy protein formulations sold in Bahia (Brazil) were determined by…”
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Understanding decidual vasculopathy and the link to preeclampsia: A review by Stevens, D.U., de Nobrega Teixeira, J.A., Spaanderman, M.E.A., Bulten, J., van Vugt, J.M.G., Al-Nasiry, S.

“…Preeclampsia is the archetype of a spectrum of clinical disorders related to abnormal placental development or function, characterized by placental…”
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Thrombosis of St. Jude medical cardiac valve in the mitral position by Commerford, P J, Lloyd, E A, De Nobrega, J A

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