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  1. Article ; Online: Aerosol dilution as a new sample introduction strategy for microwave-induced plasma optical emission spectrometry.

    Rocha, Anderson Araújo / da Costa, Luiz Gabriel B A / Duyck, Christiane / Barbosa, Joseane Ribeiro / Lorençatto, Rodolfo

    Analytica chimica acta

    2020  Volume 1140, Page(s) 41–49

    Abstract: A new sample introduction method using aerosol dilution for microwave-induced plasma optical emission spectrometry (MIP OES) is presented. Signal emissions from ... ...

    Abstract A new sample introduction method using aerosol dilution for microwave-induced plasma optical emission spectrometry (MIP OES) is presented. Signal emissions from N
    Language English
    Publishing date 2020-10-07
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1483436-4
    ISSN 1873-4324 ; 0003-2670
    ISSN (online) 1873-4324
    ISSN 0003-2670
    DOI 10.1016/j.aca.2020.10.008
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Carbonate system in the Cabo Frio upwelling.

    Silva, Carlos Augusto Ramos E / de Godoy Fernandes, Livia Viana / de Souza, Flavo Elano Soares / Marotta, Humberto / da Costa Fernandes, Flavio / Mello, Thaise Machado Senez / Monteiro, Nicole Silva Caliman / Rocha, Anderson Araújo / Coutinho, Ricardo / de Almeida Fernandes, Lohengrin Dias / Damasceno, Raimundo Nonato / Dos Santos, Ludmila Caetano

    Scientific reports

    2023  Volume 13, Issue 1, Page(s) 5292

    Abstract: The quantitative assessment of the carbonate system represents one of the biggest challenges toward the "Sustainable Development Goals" defined by the United Nations in 2015. In this sense, the present study investigated the Spatio-temporal dynamics of ... ...

    Abstract The quantitative assessment of the carbonate system represents one of the biggest challenges toward the "Sustainable Development Goals" defined by the United Nations in 2015. In this sense, the present study investigated the Spatio-temporal dynamics of the carbonate system and the effects of the El Niño and La Niña phenomena over the Cabo Frio upwelling area. The physical characterization of the site was carried out through data on wind speed and sea surface temperature. Water samples were also collected during the oceanographic cruise onboard the Diadorim R/V (Research Vessel). From these samples, the parameters of absolute and practical salinity, density, pH, total alkalinity, carbonate, calcite, aragonite, bicarbonate dissolved inorganic carbon, carbon dioxide, partial pressure of carbon, calcium, and total boron were obtained. The highest average concentration of bicarbonate in S1 (2018 µmol/kg) seems to contribute to the dissolved inorganic carbon values (2203 µmol/kg). The values of calcite saturation state, aragonite saturation state, and carbonate were higher on the surface of each station (calcite saturation state = 4.80-5.48; aragonite saturation state = 3.10-3.63, and carbonate = 189-216 µmol/kg). The mean values of pH were similar in the day/night samples (7.96/7.97). The whole carbonate system was calculated through thermodynamic modeling with the Marine Chemical Analysis (AQM) program loaded with the results of the following parameters: temperature, salinity, total alkalinity, and pH parameters. This manuscript presents original data on the carbonate system and the "acidification" process influenced by the Cabo Frio upwelling, which directly depends on the El Niño and La Niña phenomena oscillations in the sea surface temperature.
    Language English
    Publishing date 2023-03-31
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-023-31479-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Fabrication and characterization of remineralizing dental composites containing hydroxyapatite nanoparticles.

    Jardim, Renata Nunes / Rocha, Anderson Araújo / Rossi, Alexandre Malta / de Almeida Neves, Aline / Portela, Maristela Barbosa / Lopes, Ricardo Tadeu / Pires Dos Santos, Thais Maria / Xing, Yutao / Moreira da Silva, Eduardo

    Journal of the mechanical behavior of biomedical materials

    2020  Volume 109, Page(s) 103817

    Abstract: The aim of this study was to fabricate and characterize dental composites containing hydroxyapatite nanoparticles (HApNPs). Four dental composites were produced from the same organic matrix (70 wt% Bis-GMA and 30 wt% TEGDMA), with partial replacement of ... ...

    Abstract The aim of this study was to fabricate and characterize dental composites containing hydroxyapatite nanoparticles (HApNPs). Four dental composites were produced from the same organic matrix (70 wt% Bis-GMA and 30 wt% TEGDMA), with partial replacement of BaBSi particles (65 wt%) by HApNPs in the following concentrations (wt%): E0 (0) - control, E10 (10), E20 (20) and E30 (30). Ca
    MeSH term(s) Bisphenol A-Glycidyl Methacrylate ; Composite Resins ; Durapatite ; Materials Testing ; Nanoparticles ; Polymethacrylic Acids
    Chemical Substances Composite Resins ; Polymethacrylic Acids ; Bisphenol A-Glycidyl Methacrylate (454I75YXY0) ; Durapatite (91D9GV0Z28)
    Language English
    Publishing date 2020-04-28
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2378381-3
    ISSN 1878-0180 ; 1751-6161
    ISSN (online) 1878-0180
    ISSN 1751-6161
    DOI 10.1016/j.jmbbm.2020.103817
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Effect of dentifrice containing fTCP, CPP-ACP and fluoride in the prevention of enamel demineralization.

    Pinto de Souza, Suzana Carvalho Teixeira / Araújo, Kaline Cassiano de / Barbosa, Joseane Ribeiro / Cancio, Viviane / Rocha, Anderson Araújo / Tostes, Mônica Almeida

    Acta odontologica Scandinavica

    2017  Volume 76, Issue 3, Page(s) 188–194

    Abstract: Objective: To evaluate the effect of different fluoride- and calcium- and/or phosphate-containing products on their ability to prevent enamel demineralization under pH cycling conditions.: Material and methods: Enamel bovine specimens were assigned ... ...

    Abstract Objective: To evaluate the effect of different fluoride- and calcium- and/or phosphate-containing products on their ability to prevent enamel demineralization under pH cycling conditions.
    Material and methods: Enamel bovine specimens were assigned to the following groups: G1-MPP (MI Paste Plus, 0.2% NaF, Recaldent™, GC Corporation Tokyo, Japan); G2-FD (Crest™ Cavity Protection, 0.243% NaF, Procter & Gamble, USA); G3-CLP (Clinpro™ 5000, 1.1% NaF, 3M ESPE, USA); and G4-CO (Control without fluoride, Silica-based dentifrice; Daudt Ltda, Brazil). The specimens were soaked in demineralizing solution for 6 h and remineralizing solution for 18 h alternatively for 10 days. The toothpaste was prepared with deionized water in a 1:3 ratio (w/v) for three minutes daily. The solutions were renewed every 48 h. After cycling, enamel changes were analysed by percentage change of SMH (%SMH) and energy-dispersive X-ray spectroscopy (EDS). The %SMH value observed for G3-CLP (2.9 ± 39.2) was higher than that found in G4-CO (-13.0 ± 20.7), G1-MPP (-8.9 ± 20.9) and G2-FD (-3.9 ± 27.1). The %SMH was similar for all treatment groups (one-way ANOVA and Tukey's HSD; p < .05). The pH, Ca
    Conclusions: The Clinpro™ 5000 demonstrated having the most protective effect against demineralization; however, the % SMH was similar for all groups.
    MeSH term(s) Animals ; Caseins/administration & dosage ; Caseins/pharmacology ; Cattle ; Dental Caries/drug therapy ; Dental Enamel/drug effects ; Dentifrices/chemistry ; Fluorides/administration & dosage ; Fluorides/pharmacology ; Phosphates/administration & dosage ; Phosphates/pharmacology ; Piperidines/administration & dosage ; Piperidines/pharmacology ; Tooth Demineralization/prevention & control ; Tooth Remineralization/methods ; Toothpastes/administration & dosage ; Toothpastes/pharmacology
    Chemical Substances Caseins ; Dentifrices ; Phosphates ; Piperidines ; Toothpastes ; casein phosphopeptide-amorphous calcium phosphate nanocomplex ; fluorophosphate (15181-43-8) ; 4-fluoro-1-(1-(2-thienyl)cyclohexyl)piperidine (99486-47-2) ; Fluorides (Q80VPU408O)
    Language English
    Publishing date 2017-11-20
    Publishing country England
    Document type Journal Article
    ZDB-ID 210362-x
    ISSN 1502-3850 ; 0001-6357
    ISSN (online) 1502-3850
    ISSN 0001-6357
    DOI 10.1080/00016357.2017.1401658
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Ul III Zs.110: Show issues Location:
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  5. Article ; Online: Determinação de fósforo orgânico em águas de produção petrolífera por ICP- AES e ICP- MS após pré-concentração em coluna de sílica-C18

    Rocha Anderson Araújo / Miekeley Norbert / Silveira Carmem Lúcia Porto da / Bezerra Maria Carmem Moreira

    Química Nova, Vol 21, Iss 5, Pp 584-

    1998  Volume 589

    Abstract: Results on the optimization of analytical methods for the determination of phosphorus in phosphino-polycarboxylate (PPCA), used frequently as scale inhibitor during oil production, by ICP-AES and ICP-MS are presented. Due to the complex matrix of ... ...

    Abstract Results on the optimization of analytical methods for the determination of phosphorus in phosphino-polycarboxylate (PPCA), used frequently as scale inhibitor during oil production, by ICP-AES and ICP-MS are presented. Due to the complex matrix of production waters (brines) and their high concentration in inorganic phosphorus, the separation of organic phosphorus prior to its determination is necessary. In this work, minicolumns of silica immobilized C18 were used. Optimization of the separation step resulted in the following working conditions: (1) prewashing of the column with methanol (80% v/v); (2) use of a flow rate of 5 mL/min and 10 mL/min, respectively, for the preconditioning step and for percolation of the water sample; (3) final elution of organic phosphorus with 7 mL of buffer of H3BO3/NaOH (0.05 M, pH 9) with a flow rate of 1 mL/min. Sample detection limits (3s) for different combinations of nebulizers and spectrometric methods, based on 10 mL water aliquots, are: ICP-AES -Cross flow (47 mg/L) and Ultrasonic (18 mug/L); ICP-MS -Cross flow (1.2 mug/L), Cyclonic (0.7 mug/L) and Ultrasonic (0.5 mug/L). Typical recoveries of organic phosphorus are between 90 and 95% and the repeatability of the whole procedure is better than 10%. The developed methodology was applied successfully to samples from the oil-well NA 46, platform PNA 2, Campos basin, Brazil. Assessment of the PPCA inhibitor was possible at lower concentrations than achieved by current analytical methods, resulting in benefits such as reduced cost of chemicals, postponed oil production and lower environmental impacts.
    Keywords phosphorus in production water ; scale inhibitors ; ICP-MS ; ICP-AES ; Chemistry ; QD1-999 ; Science ; Q ; DOAJ:Chemistry (General) ; DOAJ:Chemistry
    Subject code 540
    Language English
    Publishing date 1998-01-01T00:00:00Z
    Publisher Sociedade Brasileira de Química
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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