Search Results - "Barbeira, Paulo S."

Determination of residual oil in diesel oil by spectrofluorimetric and chemometric analysis by Corgozinho, Camila N.C., Pasa, Vânya M.D., Barbeira, Paulo J.S.

“…Multivariate calibration (PLS), principal components analysis (PCA) and linear discriminant analysis (LDA), associated to synchronous spectrofluorimetry, were…”
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Determination of flash point and cetane index in diesel using distillation curves and multivariate calibration by Aleme, Helga G., Barbeira, Paulo J.S.

“…► PLS regression and distillation curves were effective to predict diesel flash point. ► PLS regression and distillation curves were effective to predict…”
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Norfloxacin Zn(II)-based complexes: acid base ionization constant determination, DNA and albumin binding properties and the biological effect against Trypanosoma cruzi by Gouvea, Ligiane R., Martins, Darliane A., da Gama Jean Batista, Denise, de Nazaré C. Soeiro, Maria, Louro, Sonia R. W., Barbeira, Paulo J. S., Teixeira, Letícia R.

“…Zn(II) complexes with norfloxacin (NOR) in the absence or in the presence of 1,10-phenanthroline (phen) were obtained and characterized. In both complexes, the…”
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Detection and quantification of adulterants in gasoline using distillation curves and multivariate methods by Mendes, Gisele, Barbeira, Paulo J.S.

“…•PCA applied to distillation curves enables the detection of gasoline adulterations.•The most important fractions for the discrimination were the 4–40%(v/v)…”
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Determination of octane numbers in gasoline by distillation curves and partial least squares regression by Mendes, Gisele, Aleme, Helga G., Barbeira, Paulo J.S.

“…► PLS applied to distillation curves enables the prediction of octane numbers. ► For MON and RON, the fractions lower than 60%v/v were the most important…”
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Short-term cadmium exposure induces gas exchanges, morphological and ultrastructural disturbances in mangrove Avicennia schaueriana young plants by Garcia, Janaina S., Dalmolin, Ândrea C., Cortez, Priscila A., Barbeira, Paulo S., Mangabeira, Pedro A.O., França, Marcel G.C.

“…Mangroves have been subject to more metal contamination, including cadmium (Cd). This study evaluated if a relatively short Cd exposure may induce metabolic,…”
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Different Chemometric Methods for the Discrimination of Commercial Aged Cachaças by Bernardes, Cristina D, Barbeira, Paulo J. S

“…Cachaça, like other distilled beverages, often passes through an aging process and a peculiar fact is that Brazilian native woods are used for producing the…”
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Spectroscopic and electrochemical characterization of gold(I) and gold(III) complexes with glyoxaldehyde bis(thiosemicarbazones): cytotoxicity against human tumor cell lines and inhibition of thioredoxin reductase activity by Lessa, Josane A., Ferraz, Karina S. O., Guerra, Juliana C., de Miranda, Luana F., Romeiro, Carla F. D., Souza-Fagundes, Elaine M., Barbeira, Paulo Jorge S., Beraldo, Heloisa

“…Complexes [Au 2 (H 2 Gy3DH) 2 ]Cl 2 ( 1 ), [Au(H 2 Gy3Me)]Cl 3 ( 2 ) and [Au(H 2 Gy3Et)]Cl 3 ( 3 ) were obtained with glyoxaldehyde bis (thiosemicarbazone) (H…”
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Differentiation of Gasoline Samples Using Flame Emission Spectroscopy and Partial Least Squares Discriminate Analysis by de Paulo, Jaqueline M, Barros, José E. M, Barbeira, Paulo J. S

“…In this work, flame emission spectroscopy (FES) was combined with the partial least squares discriminant analysis (PLS-DA) method aimed at classifying…”
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Determination of specific gravity and kinematic viscosity of diesel using distillation curves and multivariate calibration by Aleme, Helga G., Assunção, Rosely A., Carvalho, Mariana M.O., Barbeira, Paulo J.S.

“…In order to predict specific gravity and kinematic viscosity, distillation curves (used in the quality control of diesel) were associated with the partial…”
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Determination of gasoline origin by distillation curves and multivariate analysis by Aleme, Helga G., Costa, Letícia M., Barbeira, Paulo J.S.

“…Pattern recognition (PCA – principal component analysis) and classification (LDA – linear discriminant analysis) were employed to determine the origin of…”
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3D printing of electrochemical cell for voltammetric detection and photodegradation monitoring of folic acid in juice samples by Silva-Neto, Habdias A., Barbeira, Paulo J.S., Coltro, Wendell K.T., Piccin, Evandro

“…[Display omitted] •Fully 3D-printed electrodes was created using a multi-material additive printer.•The voltammetric method was utilized for monitoring the…”
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Determination of ethanol and specific gravity in gasoline by distillation curves and multivariate analysis by Aleme, Helga G., Costa, Letícia M., Barbeira, Paulo J.S.

“…The partial least-squares regression method (PLS) was employed to predict the amount of ethanol and specific gravity in automotive gasoline using distillation…”
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Quantification of fullerene nanoparticles suspensions in water based on optical scattering by Sene, Juliana A., Pinheiro, Maurício V.B., Krambrock, Klaus, Barbeira, Paulo J.S.

“…Fullerenes, and in particular the C 60, have been intensively investigated in the last decades mainly because of their vast range of potential applications in…”
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Effects of two 6-quinolinyl chalcones on the integrity of plasma membrane of Paracoccidioides brasiliensis by de Sá, Nívea P, Cisalpino, Patrícia S, Tavares, Luciana C, Espíndola, Leandro, Borelli, Beatriz M, Barbeira, Paulo JS, Cardoso Perdigão, Gabriele de Matos, Souza-Fagundes, Elaine M, Rosa, Carlos A, Pizzolatti, Moacir G, Johann, Susana

“…Paracoccidioidomycosis is the most prevalent systemic mycosis in Latin America, yet few therapeutic options exist. Our aim was to search for new compounds with…”
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Atypical fluoroquinolone gold(III) chelates as potential anticancer agents: Relevance of DNA and protein interactions for their mechanism of action by Gouvea, Ligiane R., Garcia, Luciene S., Lachter, Daniela R., Nunes, Paula Roberta, de Castro Pereira, Flávia, Silveira-Lacerda, Elisângela P., Louro, Sônia R.W., Barbeira, Paulo Jorge S., Teixeira, Letícia R.

“…Quinolones are known for their antimicrobial and antitumor activities. Gold(III) compounds constitute an emerging class of biologically active substances, of…”
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Development of a multivariate calibration model for the determination of dry extract content in Brazilian commercial bee propolis extracts through UV–Vis spectroscopy by Barbeira, Paulo J.S., Paganotti, Rosilene S.N., Ássimos, Ariane A.

“…[Display omitted] •Step of centrifugation is required to determine the dry extract content.•Residue obtained after centrifugation is composed mainly of…”
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Identification of Gasoline Origin by Physical and Chemical Properties and Multivariate Analysis by Barbeira, Paulo J. S, Pereira, Rita C. C, Corgozinho, Camila N. C

“…Hierarchical cluster and linear discriminant analysis, associated with physicochemical assays, were used to identify the origin of gasoline commercialized in…”
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Diesel oil discrimination by origin and type using physicochemical properties and multivariate analysis by Aleme, Helga G., Corgozinho, Camila N.C., Barbeira, Paulo J.S.

“…The objective of this work is to provide models for the prediction and classification of B4 (volume fraction of 4% in conventional diesel) and diesel samples…”
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A PLS regression model using flame spectroscopy emission for determination of octane numbers in gasoline by de Paulo, Jaqueline M., Barros, José E.M., Barbeira, Paulo J.S.

“…This paper presents a method for the prediction of MON (Motor Octane Number) and RON (Research Octane Number) of automotive gasoline using flame emission…”
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