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Summary Background and aims: Serra do Itapetinga houses one of the most important remnants of Atlantic Forest in the macrometropolis of Sao Paulo, the most populous region of Brazil. In the context of monographic works on Brazilian Nothoscordum species, a new species with current distribution restricted to Serra do Itapetinga was identified, and is described and illustrated here. M&M: Recognition of the new species is based on morphological, molecular and cytological data. Descriptions and morphological comparisons were obtained from examination of herbarium collections or living plants. Based on nuclear (ITS) and plastid (ndhF and matK) DNA markers, a molecular phylogeny including the described species is presented. Its conservation status was assessed using the IUCN Red List Categories and Criteria. Results: Nothoscordum itapetinga bears free staminal filaments, a typical morphological character of sect. Nothoscordum. Its placement in sect. Nothoscordum is also supported by molecular data and base chromosome number. We provide its chromosome count along with karyotype formula and DNA content. Comments on its distribution, habitat and conservation are furnished. Conclusions: With the data available the new species is considered Critically Endangered (CR). The localities of occurrence suffered decades of impacts resulting from intensive and uncontrolled use, in addition to human-induced fires, which modified the vegetation structure and floristic composition. Urgent measures are required to ensure the survival of the remaining populations of N. itapetinga.

Resumo Introdugao e objetivos: A Serra do Itapetinga abriga um dos mais importantes remanescentes de Floresta Atlántica da Macrometrópole Paulista, a regiáo mais populosa do Brasil. No contexto do tratamento monográfico de Nothoscordum para o país, uma nova espécie com distribuipáo atual restrita á Serra do Itapetinga foi identificada e é aqui descrita e ilustrada. M&M: O reconhecimento da nova espécie está baseado tanto em dados morfológicos como moleculares e citogenéticos. As descripóes e comparares morfológicas foram feitas a partir da análise de materiais vivos ou depositados nas colepóes dos herbários consultados. Com base em marcadores nuclear (ITS) e plastidiais (ndhF e matK) uma filogenia molecular incluindo a espécie descrita é apresentada. O seu estado de conservapáo foi avaliado de acordo com diretrizes e critérios da IUCN. Resultados: Nothoscordum itapetinga apresenta filamentos estaminais livres, uma característica típica da sepáo Nothoscordum. Seu posicionamento nesta sepáo também é suportado por dados moleculares e número cromossomico básico. Sáo fornecidos seu número cromossomico, fórmula cariotípica e conteúdo total de DNA. Comentários sobre sua distribuipáo, hábitat e conservapáo sáo apresentados. Conclusoes: Com base nos dados disponíveis, a nova espécie é considerada Criticamente em Perigo de extinpáo. As localidades de ocorréncia sofreram décadas de impactos do uso intensivo e náo ordenado, além de incendios florestais, e que alteraram parte de sua estrutura e composipáo florística. Apees urgentes sáo consideradas fundamentais para garantir a sobrevivéncia das populapóes remanescentes de N. itapetinga.

https://doi.org/10.31055/1851.2372.v58.n3.40225

Low-Temperature Partitioning: A Simple Screening Method for Determining Diethylene Glycol in Beer by Gas Chromatography
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Azevedo, Mariane M.

; Miranda, Liany D. L.

; Queiroz, Maria Eliana L. R. de

; Oliveira, André F. de

; Pereira, Alexandre F.

; Neves, Antônio A.

; Silva, Thaís L. R.

Journal of the Brazilian Chemical Society

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Mar 2023, Volumen 34 Nº 3 Paginas 452 - 460

Resumen: En | Texto: En | PDF: En

Diethylene glycol is an extremely toxic substance to humans. Recently, cases of beer contamination in Brazil have raised awareness of the need for developing simple screening methods to evaluate this type of compound. This research developed a liquid-liquid extraction with low-temperature partitioning technique to determine diethylene glycol in beer via gas chromatography. Employing a flame-ionization detector simplifies the method, lowers its cost and therefore, it can be used as screening step to assess the possibility of contamination. A gas chromatograph coupled to a mass spectrometer would be used only for a confirmatory analysis. The optimized method was validated for the main figures of merit, and it proved to be adequate, with good values of recovery rate (94-106%), limit of detection (3.0 mg L-1), and quantification (10.0 mg L-1). Accuracy, in terms of repeatability and intermediate accuracy, showed variation coefficients lower than or equal to 20%. This method was applied to 28 samples of beers marketed in Brazil, and diethylene glycol was found above the limit of detection in three of them (10.7%). These results were confirmed by a gas chromatograph coupled to a mass spectrometer, which showed the reliability of the screening method for determining diethylene glycol in beer samples.

https://doi.org/10.21577/0103-5053.20220123

Produção e efeito da germinação em sementes de jaca: caracterização química, física e físico-química
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Silva, Luís P. F. R. da

; Queiroz, Alexandre J. M.

; Figueirêdo, Rossana M. F.

; Campos, Ana Regina N.

; Matos, Joana D. P. de

; Moraes, Maria Suiane de

; Silva, Semirames do N.

; Gonçalves, Mailson G.

; Mascarenhas, Nágela M. H.

; Medeiros Neto, Moises S. de

; Rodrigues, Larissa M. S.

; Vieira, Agdylannah F.

; Costa, Zanelli R. T.

; Moura, Rodrigo L.

Revista de Ciências Agrárias

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Jun 2022, Volumen 45 Nº 1-2 Paginas 51 - 60

Resumen: En Pt | Texto: En Pt | PDF: En | PDF: Pt

Abstract Jackfruit is an exotic fruit present in the Northeast region of Brazil, presenting a great economic potential for the region because of the internal and external commercialization of its fruit. Its seed is rich in carbohydrates, protein, minerals and vitamins, and is an alternative source of starch and for food. Germination is an easily accessible, inexpensive technology for the production of sprouts, improving the bioavailability of nutrients in the seed for consumption, such as proteins and bioactive compounds. The objective of this work was to evaluate the chemical, physical and physicochemical parameters of fresh and germinated jackfruit seeds. The germination of jackfruit seeds increased the contents of water, proteins, ascorbic acid, phenolic compounds and total sugars, in addition to reducing the content of starch, lipids, tannins and the parameters of color, luminosity, red (+ a*) and yellow (+b*) intensities. In relation to the physical properties of the seed, there was an increase in the real specific mass and in the unit mass. For apparent specific mass there was a reduction. Seed germination provided an increase in the levels of magnesium, iron and sodium, consequently reducing potassium, phosphorus, calcium, zinc, copper and manganese.

Resumo A jaca é um fruto exótico presente na região Nordeste do Brasil, apresentando um grande potencial econômico para região em face da comercialização interna e externa do seu fruto. Sua semente é rica em carboidratos, proteína, minerais e vitaminas, constituindo fonte alternativa de amido para alimentação. A germinação é uma tecnologia barata de fácil acesso para produção de brotos, melhorando a biodisponibilidade de nutrientes na semente para o consumo, a exemplo das proteínas e compostos bioativos. O objetivo do trabalho foi avaliar os parâmetros químicos, físicos e físico-químicos das sementes de jaca in natura e germinadas. A germinação das sementes de jaca proporcionou o aumento nos teores de água, proteínas, ácido ascórbico, compostos fenólicos e açúcares totais, além de reduzir os conteúdo de amido, lipídios, taninos e os parâmetros de cor, a luminosidade, intensidade de vermelho (+a*) e de amarelo (+b*). Em relação às propriedades físicas da semente, ocorreu acréscimo na massa específica real e na massa unitária. Para massa específica aparente houve redução. A germinação das sementes proporcionou aumento nos teores de magnésio, ferro e sódio, consequentemente ocorrendo redução de potássio, fósforo, cálcio, zinco, cobre e manganês.

https://doi.org/10.19084/rca.25988

Mathematical modeling and thermodynamic properties in the drying of citron watermelon seeds
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Leite, Daniela D. de F.

; Queiroz, Alexandre J. de M.

; Figueirêdo, Rossana M. F. de

; Santos, Francislaine S. dos

; Silva, Semirames do N.

; Santos, Dyego da C.

Revista Brasileira de Engenharia Agrícola e Ambiental

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Ene 2022, Volumen 26 Nº 1 Paginas 67 - 74

Resumen: Pt En | Texto: Pt En | PDF: Pt | PDF: En

RESUMO A melancia africana é um produto agrícola de excelente potencial econômico. Suas sementes são muito utilizadas para extração de óleo, servindo como fonte energética, demonstrando características nutricionais que a habilitam como produto a ser estudado. Assim, objetivou-se caracterizar quanto à composição físico-química, as sementes de melancia africana, além de determinar a cinética de secagem, ajustar modelos matemáticos aos dados, determinar os coeficientes de difusividade efetiva e propriedades termodinâmicas. As sementes foram submetidas à secagem em secador convectivo, variando-se a temperatura de secagem, com velocidade do ar de 1,0 m s-1. Com o aumento da temperatura de secagem diminuiu o teor de água, atividade de água, teor de cinzas, acidez total titulável, lipídios e açúcar redutor. As sementes de melancia africana são ricas em lipídios e cinzas, tem baixos teores de açúcares e baixa acidez; as cinéticas de secagem foram muito bem descritas pelos modelos Dois Termos e Aproximação da Difusão, seguidos pelos modelos de Midilli e Page, que resultaram em ajustes aceitáveis. A difusividade efetiva acompanhou o aumento da temperatura de secagem, e este comportamento foi satisfatoriamente ajustado por equação do tipo Arrhenius. As variações de entalpia e entropia foram reduzidas com a temperatura de secagem, com aumentos da energia livre de Gibbs.

ABSTRACT Citron watermelon is an agricultural product of excellent economic potential. Its seeds are widely used for oil extraction, serving as an energy source, showing nutritional characteristics that make them a suitable product to be studied. Thus, the objective was to characterize citron watermelon seeds regarding their physicochemical composition, in addition to determining drying kinetics, fitting mathematical models to the data, and determining the effective diffusivity coefficients and thermodynamic properties. The seeds were dried in a convective dryer, varying the drying temperature, with air velocity of 1.0 m s-1. With the increase in drying temperature, there were reductions in moisture content, water activity (aw), ash concentration, total titratable acidity, lipids and reducing sugar. Citron watermelon seeds are rich in lipids and ash, have low sugar concentration and low acidity; their drying kinetics was very well described by the Two Terms and Approximation of Diffusion models, followed by the models of Midilli and Page, which resulted in acceptable fits. Effective diffusivity accompanied the increase in drying temperature, and this behavior was well fitted by an Arrhenius-type equation. Enthalpy and entropy variations were reduced with drying temperature, with increments in Gibbs free energy.

https://doi.org/10.1590/1807-1929/agriambi.v26n1p67-74 76 descargas

Antarctic environments as a source of bacterial and fungal therapeutic enzymes
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LIMA, IGOR G.O.

; BISPO, JAMES R.S.

; AGOSTINHO, ADSON Y.H.

; QUEIROZ, ALINE C. DE

; MOREIRA, MAGNA SUZANA A.

; PASSARINI, MICHEL RODRIGO Z.

; OLIVEIRA, VALÉRIA M. DE

; SETTE, LARA D.

; ROSA, LUIZ HENRIQUE

; DUARTE, ALYSSON WAGNER F.

Anais da Academia Brasileira de Ciências

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2022, Volumen 94 Supl. 1 elocation e20210452

Resumen: En | Texto: En | PDF: En

Abstract Microbial therapeutic enzymes are the protagonists in the pharmacological treatment of different human diseases. The intrinsic enzymatic characteristics, such as high affinity and specificity to the corresponding substrate, enable effective therapies, with minimal adverse effects and complete remission. However, immunogenicity, short half-life, low enzymatic yield, and low selectivity regarding available enzyme drugs are currently the main obstacles to their development and the broad adherence to therapeutic protocols. By harboring adapted and still unexplored microbial life, environments of extreme conditions, such as Antarctica, become especially important in the prospecting and development of new enzymatic compounds that present higher yields and the possibility of genetic improvement. Antarctic microorganisms have adaptation mechanisms, such as more fluid cell membranes, production of antifreeze proteins and enzymes with more malleable structures, more robust, stable, selective catalytic sites for their respective substrates, and high antioxidant capacity. In this context, this review aims to explore enzymes synthesized by bacteria and fungi from Antarctica as potential drug producers, capable of providing therapeutic efficacy, less adverse effects, and lower production costs with highlight to L-Asparaginase, collagenase, superoxide dismutase and ribonucleases. In addition, this review highlights the unique biotechnological profile of these Antarctic extremophile microorganisms.

https://doi.org/10.1590/0001-3765202220210452

Sistemas do Tipo Difusão-Reação e Preservação de Pontos Singulares
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JUDICE, S. F. P. P.

; SANTOS, Í. M. F.

; KOSCHECK, N.

; LOULA, A. D.

; GIRALDI, G. A.

; QUEIROZ, R. A. B. DE

Trends in Computational and Applied Mathematics

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Ago 2021, Volumen 22 Nº 2 Paginas 241 - 263

Resumen: Pt En | Texto: Pt En | PDF: Pt | PDF: En

RESUMO Motivados por aplicações recentes em computação gráfica, este trabalho apresenta um estudo teórico e computacional de sistemas de difusão-reação baseados no Gradient Vector Flow (GVF), com foco no comportamento do GVF em relação às singularidades do campo inicial. O estudo teórico parte de uma análise local, independente de condições de fronteira. Em seguida, supõe-se condição de fronteira no infinito e usa-se análise de Fourier para estabelecer condições suficientes para preservação do ponto singular. Finalmente, supõe-se um domínio compacto, com geometria retangular, e analisa-se a preservação de um ponto singular em relação à condição de fronteira usando um método de solução de equações diferenciais parciais (EDPs) baseado em wavelets de Haar. Desenvolvemos também uma implementação de um método direto para a equação estacionária do GVF baseado em diferenças finitas (DF) para comparar com a solução tradicional do Euler explícito, no que diz respeito a singularidade. É discutida a influência da vorticidade no problema de interesse usando a função de linhas de corrente e equação de Helmholtz. Nos experimentos computacionais, consideramos duas condições de fronteira, dois tipos de singularidades e os três métodos numéricos (Euler explícito, diferenças finitas para a equação estacionária, e wavelets) para verificar os resultados teóricos obtidos.

ABSTRACT Motivated by recent computer graphics applications, this work presents a theoretical and computational study of diffusion-reaction systems based on Gradient Vector Flow (GVF), focusing on the behavior of GVF concerning the singularities of the initial vector field. The theoretical study starts from a local analysis, regardless of boundary conditions. Then, the boundary condition at infinity is assumed, and Fourier analysis is used to establish sufficient conditions for preserving the singular point. Finally, a compact domain with rectangular geometry is assumed. The preservation of a singular point concerning the boundary condition is analyzed using a method for solving partial differential equations (PDEs) based on Haar wavelets. We have also developed an implementation of a direct method for the GVF stationary equation based on finite differences (DF) to compare with the traditional explicit Euler solution with respect to singularity. The influence of vorticity on the problem of interest is discussed using the streamlines function and the Helmholtz equation. In the computational experiments, we consider two boundary conditions, two types of singularities, and the three numerical methods (explicit Euler, finite differences for the stationary equation, and wavelets) to verify the theoretical results obtained.

https://doi.org/10.5540/tcam.2021.022.02.00241 1183 descargas

Development of a TD-NMR Method to Monitor Brazil Nuts Oil Content: A Green and Low-Cost Based Approach
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Ribeiro, Úrsula A.

; Queiroz, Leonardo C.

; Marassi, Agide G.

; Carvalho, André S.

; Barros, Gabriel A.

; Consalter, Daniel M.

; Bezerra, Jaqueline A.

; Santos, Alan D. C.

; Colnago, Luiz Alberto

; Machado, Marcos B.

Journal of the Brazilian Chemical Society

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Jul 2021, Volumen 32 Nº 7 Paginas 1405 - 1412

Resumen: En | Texto: En | PDF: En

Growth in the international popularity of Brazil nuts oil (Bertholletia excelsa, Bonpl.) has demanded a closer look at quality aspects of the nuts. In this context, time-domain 1H nuclear magnetic resonance spectroscopy (TD-NMR) can be a useful tool for assessing the lipid portion of such matrices. In this work, a TD-NMR method was developed and validated to assess the oil content directly from Brazil nuts following the ISO 10565:1998 and DOQ-CGCRE-008. Full validation was addressed covering the working range from 0.67 to 25.00 g (coefficient of determination, R2= 0.9993). Limits of detection (LOD) and quantification (LOQ) were 0.20 and 0.67 g, respectively. The repeatability and intermediate precision assays met the guide requirements. Oil contents obtained in two laboratories (different equipment) were statistically similar (66.93 ± 4.69 and 70.13 ± 4.15%), highlighting the method’s robustness. The developed approach has the potential to be adopted as an industrial reference method for in situ monitoring of Brazil nuts oil contents.

https://doi.org/10.21577/0103-5053.20210039 105 descargas

Bioprospection of ligninolytic enzymes from marine origin filamentous fungi
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DANTAS, CAMILA P.

; PINCHEMEL, JOÃO PEDRO D.

; JESUS, GISELE M. DE

; PIMENTEL, MILENA B.

; OLIVEIRA, OLÍVIA MARIA C.

; QUEIROZ, ANTÔNIO FERNANDO S.

; LIMA, DANUSIA F.

Anais da Academia Brasileira de Ciências

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2021, Volumen 93 elocation e20210296

Resumen: En | Texto: En | PDF: En

Abstract Fungi are excellent producers of extracellular enzymes. Therefore, the present study aimed to investigate the screening of marine fungi, which are laccase and manganese peroxidase potential producers, in solid fermentation for future applications in bioremediation processes of contaminated sites. For this purpose, two-level factorial planning was adopted, using time (6 and 15 days) and the absence or presence of oil (0 and 1%) as factors. The semi-quantitative evaluation was carried out by calculating radial growth, enzyme activity and enzyme index by measuring phenol red or syringaldazine oxidation halo. The results showed that all the studied strains showed a positive result for manganese peroxidase production, with an enzymatic activity in solid medium less than 0.61, indicating a strongly positive activity. Through the enzyme index, the study also showed prominence for Penicillium sp. strains, with values > 2. The enzyme index increase in oil presence and the inexpressive use of the genera studied for ligninolytic enzymes production from crude oil demonstrated these data importance for fermentative processes optimization. Considering the ability of these strains to develop into recalcitrant compounds and the potential for manganese peroxidase production, they are indicated for exploitation in various bioremediation technologies, as well as other biotechnological applications.

https://doi.org/10.1590/0001-3765202120210296 118 descargas

Poor Sleep quality and health-related quality of life impact in adolescents with and without chronic immunosuppressive conditions during COVID-19 quarantine
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Helito, Alberto C.

; Lindoso, Livia

; Sieczkowska, Sofia M.

; Astley, Camilla

; Queiroz, Ligia B.

; Rose, Natalia

; Santos, Claudia Renata P.

; Bolzan, Thalis

; Peralta, Rita María I.A.

; Franco, Ruth R.

; Cominato, Louise

; Pereira, Rosa Maria R.

; Tannuri, Uenis

; Campos, Lucia Maria A.

; Lourenço, Benito

; Toma, Ricardo K.

; Medeiros, Karina

; Watanabe, Andréia

; Grangeiro, Patricia Moreno

; Farhat, Sylvia C.

; Casella, Caio B.

; Polanczyk, Guilherme V.

; Gualano, Bruno

; Silva, Clovis A.

; Sallum, Adriana M. E.

; Iraha, Amanda Y.

; Ihara, Bianca P.

; Mazzolani, Bruna C.

; Martinez, Claudia A.

; Strabelli, Claudia A. A.

; Fonseca, Claudia B.

; Lima, Dandara C. C.

; Setoue, Debora N. D.

; Roz, Deborah F. P.

; Smaira, Fabiana I.

; Roschel, Hamilton

; Miyatani, Helena T.

; Marques, Isabela G.

; Oba, Jane

; Ferreira, Juliana C. O.

; Simon, Juliana R.

; Kozu, Katia

; Saccani, Ligia P.

; Martiniano, Lorena V. M.

; Miranda, Luana C. A.

; Silva, Luiz E. V.

; Laurentino, Moisés F.

; Aikawa, Nadia E.

; Sakita, Neusa K.

; Tanigava, Nicolas Y.

; Pereira, Paulo R. A.

; Palmeira, Patrícia

; Angelo, Simone S.

; Lavorato, Sofia S. M.

; Bernardes, Tamires M.

; Franco, Tathiane C.

; Viana, Vivianne S. L.

; Barros, Vera P. M. F. R.

; Zheng, Yingying

Clinics

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2021, Volumen 76 elocation e3501

Resumen: En | Texto: En | PDF: En

OBJECTIVE: To assess the possible factors that influence sleep quality in adolescents with and without chronic immunosuppressive conditions quarantined during the coronavirus disease 2019 (COVID-19) pandemic. METHODS: This cross-sectional study included 305 adolescents with chronic immunocompromised conditions and 82 healthy adolescents. Online surveys were completed, which included questions on socio-demographic data and self-rated healthcare routine during COVID-19 quarantine and the following validated questionnaires: the Pittsburgh Sleep Quality Index (PSQI), Pediatric Quality of Life Inventory 4.0 (PedsQL4.0), and Pediatric Outcome Data Collection Instrument (PODCI). RESULTS: The median current age [14 (10-18) vs. 15 (10-18) years, p=0.847] and frequency of female sex (62% vs. 58%, p=0.571) were similar in adolescents with chronic conditions compared with healthy adolescents. The frequency of poor sleep quality was similar in both groups (38% vs. 48%, p=0.118). Logistic regression analysis, including both healthy adolescents and adolescents with chronic conditions (n=387), demonstrated that self-reported increase in screen time (odds ratio [OR] 3.0; 95% confidence interval [CI] 1.3-6.8; p=0.008) and intrafamilial violence report (OR 2.1; 95% CI 1.2-3.5; p=0.008) were independently associated with poor sleep quality in these adolescents. However, the PODCI global function score was associated with a lower OR for poor sleep quality (OR 0.97; 95% CI 0.94-0.99; p=0.001). Further logistic regression, including only adolescents with chronic conditions (n=305), demonstrated that self-reported increase in screen time (OR 3.1; 95% CI 1.4-6.8; p=0.006) and intrafamilial violence report (OR 2.0; 95% CI 1.2-3.4; p=0.011) remained independently associated with poor quality of sleep, whereas a lower PODCI global function score was associated with a lower OR for sleep quality (OR 0.96; 95% CI 0.94-0.98; p<0.001). CONCLUSION: Self-reported increases in screen time and intrafamilial violence report impacted sleep quality in both healthy adolescents and those with chronic conditions. Decreased health-related quality of life was observed in adolescents with poor sleep quality.

https://doi.org/10.6061/clinics/2021/e3501

10.

Relative validation of a food frequency questionnaire to assess dietary fatty acid intake
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Queiroz Carvalho, Gisele

; Pereira, Marcos

; Santana, Jerusa M.

; Louro, Iuri D.

; Santos, Djanilson B.

Revista chilena de nutrición

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Jun 2020, Volumen 47 Nº 3 Paginas 396 - 405

Resumen: En Es | Texto: En Es | PDF: En | PDF: Es

ABSTRACT Objectives: This study aimed to develop and validate a Food Frequency Questionnaire (FFQ) for assessing consumption of fatty acids among pregnant women. Methods: Two lists of foods were created according to percent contribution of each nutrient estimated by three 24-hour recalls: a long and short version FFQ to estimate long-chain polyunsaturated fatty acids (LCPUFAs). Student paired t-test and Pearson correlation coefficients were used to verify the differences in mean consumption of nutrients from the FFQ and 24-hour recall. The concordance between the consumption values of the two methods was assessed using the Bland-Altman method and quartiles concordance. Results: For the FFQ - long version, correlation values ranged from 0.33 (p<0.05) to 0.62 (p<0.01) for docosahexaenoic acid (DHA) and linoleic acid (LA), respectively. Eicosapentaenoic acid (EPA) and docosapentaenoic acid (DPA) were not correlated. Exact concordance ranged from 49.0% (energy) to 22.4% (EPA), and discordance ranged from 14.3% (DPA) to 2.0% (Saturated). The FFQ - short version had high correlations for LCPUFAs. Exact concordance ranged from 36.7% (n-3 LCPUFA) to 16.3% (DHA); and discordance from 12.2% (DPA) to 2.0% (arachidonic acid). Bland-Altman analysis showed good concordance for both versions. Conclusion: This nutrient-specific FFQ is a valid instrument to be used to estimate the level of consumption of fatty acids among pregnant women.

RESUMEN Objetivo: Este estudio tuvo como objetivo desarrollar y validar un cuestionario de frecuencia de consumo de alimentos para evaluar el consumo de ácidos grasos en gestantes. Métodos: Dos listas de alimentos fueron creadas de acuerdo con la contribución porcentual de cada nutriente estimado por 3 recordatorios de 24 horas: CFC - versión larga y CFC - versión corta para estimar ácidos grasos poliinsaturados de cadena larga (AGPICL). La prueba de t pareada de Student y el coeficiente de correlación de Pearson se utilizaron para verificar las diferencias entre el consumo medio de nutrientes de del CFC y el recordatorio de 24 horas. La concordancia entre los valores de consumo de los dos métodos se evaluó mediante el método de Bland-Altman y la concordancia de cuartiles. Resultados: En CFC - versión larga, los valores de correlación oscilaron entre 0.33 (p<0.05) y 0.62 (p<0.01) para ácido docosahexaenoico (DHA) y ácido linoleico (LA), respectivamente. Ácido eicosapentaenoico (EPA) y ácido docosapentaenoico (DPA) no presentaron correlación. La concordancia exacta varió de 49,0% (energía) a 22,4% (EPA), y la discordancia varió de 14,3% (DPA) a 2,0% (saturado). CFC: la versión corta mostró los mejores valores de correlaciones para los AGPICL. La concordancia exacta varió de 36,7 (n-3 LCPUFA) a 16,3% (DHA); y discordancia de 12,2% (DPA) a 2,0% (ácido araquidónico). El análisis de Bland-Altman mostró una buena concordancia para ambas versiones. Conclusión: Este método CFC específico de nutrientes es un instrumento válido que se utiliza para estimar el nivel de consumo de ácidos grasos en mujeres gestantes.

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11.

Removal of Orange G Dye by Manganese Oxide Nanostructures
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Victor, Raquel P. D.

; Fontes, Luiza L. M.

; Neves, Antônio A.

; Queiroz, Maria E. L. R. de

; Oliveira, André F. de

; Miranda, Liany D. L.

Journal of the Brazilian Chemical Society

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Ago 2019, Volumen 30 Nº 8 Paginas 1769 - 1778

Resumen: En | Texto: En | PDF: En

Two types of manganese oxide were investigated for the removal/degradation of Orange G (OG) dye in aqueous solution. One manganese oxide (pyrolusite) was obtained commercially and the other (birnessite) was prepared according to the polyol method by means of the oxidation of MnII hydroxide by H2O2. Both materials were characterized by X-ray diffraction (XRD), infrared spectroscopy (IR), scanning electron microscopy (SEM), and nitrogen adsorption/desorption at 77 K. The effects of agitation time, pH, and MnO2 dose on the degradation of OG by the birnessite and pyrolusite were evaluated. Approximately 90 and 99% decoloration of OG (10 mg L-1) was obtained after 30 min of stirring with 0.20 g L-1 of birnessite or pyrolusite, respectively. The decoloration and increased intensity of absorbance bands in the UV-visible spectrum were indicative of a degradation process that followed pseudo-first order kinetics. The findings demonstrated the high efficiency of different types of manganese oxides for removal of this organic pollutant from waters.

https://doi.org/10.21577/0103-5053.20190083 624 descargas

12.

Development of a microwave absorbing material based on molybdenum-doped niobium pentoxide
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Gurgel, D. P.

; Queiroz Jr., I. S.

; Silva Jr., M. Q. da

; Andrade, H. D. de

; Gomes, U. U.

; Karimi, M. M.

Cerâmica

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Ene 2019, Volumen 65 Supl. 1 Paginas 7 - 11

Resumen: En | Texto: En | PDF: En

Abstract This work aimed to perform the characterization of electrical properties of niobium pentoxide, Nb2O5, pure and doped with molybdenum, prepared by powder metallurgy route and to do a comparative analysis of the influence of this material when sintered in a muffle or in a microwave oven. The results showed that the doping of the niobium pentoxide with 0.5% or 1% of molybdenum along with the process of sintering in a microwave oven make the material more applicable as a microwave absorber material for electromagnetic radiation in the UHF (ultra-high frequency) range between 0.3 to 3 GHz. The motivation of this work was associated with the fact that in Brazil are located two of the largest niobium reserves in the world. Under this view, the study of the processing of the ceramic materials is important considering possible technological applications.

https://doi.org/10.1590/0366-6913201965s12559 1401 descargas

13.

Evaluación toxicológica y de metales (Cu, Pb, Ni, Zn y Cd) en el sedimento del reservorio Paiva Castro en Mairiporã-SP, Brasil
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Silva, D. C. V. R

; Queiroz, L. G

; Sager, E. A

; Cardoso-Silva, S

; Kofuji, P. Y. M

; Paiva, T. C. B. P

; Pompêo, M. L. M

Acta toxicológica argentina

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May 2018, Volumen 26 Nº 1 Paginas 01 - 11

Resumen: En Es | Texto: En Es | PDF: En | PDF: Es

Man had changed the natural environment in an attempt trying to supply the global demand for resources. The management of the hydric bodies has to be constant, with preventive and corrective purpose, depending on the eutrophization state of each one. The objective of this article was to analyze the sediment toxicity and the metals Mn, Zn, Pb, Ni, Cd and Cu, in the Paiva Castro reservoir, that supply the Metropolitan Region of São Paulo. It was made 2 collections (May 2011, dry season and January 2012, wet season). It was analyzed 5 points next to the water captation station by the Companhia de Saneamento Básico do Estado de São Paulo. The sediment was analyzed as for acute and chronic toxicity through bioassays with the cladocerans Daphnia similis and the insect Chironomus xanthus. Data treatment was done with Fisher Exact Test (mortality). The association level between the variables in sediment and ecotoxicological tests was available in non-parametric tests, through the Spearman's correlation coefficient. Oriented on the results presented in this work, pointing low concentrations of heavy metals in the sediments presented in the collect local, and the absence of toxicity, we can say that at this reservoir, at least in the collect area, it's low impacted, not implicating in direct interferences in the quality of life of benthonic organisms.

El hombre ha cambiado el ambiente para sostener la demanda global de recursos naturales como el agua. La gestión de los cuerpos hídricos tiene que ser constante, con el propósito preventivo y correctivo, dependiendo del estado de antropización de cada sistema. El objetivo de este artículo fue analizar la toxicidad del sedimento y los metales Mn, Zn, Pb, Ni, Cd y Cu, en el reservorio Paiva Castro, que abastece la Region Metropolitana de São Paulo. Se realizaron 2 muestreos (Mayo 2011, estación seca y Enero de 2012, estación húmeda) y se analizaron 5 puntos próximos a la captación de agua por la Companhia de Saneamento Básico do Estado de São Paulo. Se realizaron ensayos de toxicidad aguda y crónica en sedimento, a través de ensayos biológicos con el cladócero Daphnia similis y el insecto Chironomus xanthus. El tratamiento de datos se realizó con el test de Fisher (mortalidad). El nivel de asociación entre las variables en sedimento y en los test ecotoxicológicos fueron evaluados por test no-paramétricos, a través del coeficiente de correlación de Spearman's. Los resultados del presente trabajo señalaron bajas concentracones de metales en el sedimento del área de estudio y ausencia de toxicidad en los organismos ensayados. Se puede concluir que área estudiada del reservorio Paiva Castro se encuentra poco impactada por los metales, sin efectos directos sobre la calidad de vida los organismos bentónicos: D. similis y C. xanthus.

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14.

DLLME-GC/ECD Method for the Residual Analysis of Parathion-Methyl and its Application in the Study of the UV-Photodegradation Process
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Pimenta, Gustavo G.

; Queiroz, Maria E. L. R. de

; Victor, Raquel P. D.

; Noronha, Luiz M.

; Neves, Antônio A.

; Oliveira, André F. de

; Heleno, Fernanda F.

Journal of the Brazilian Chemical Society

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Nov 2017, Volumen 28 Nº 11 Paginas 2045 - 2053

Resumen: En | Texto: En | PDF: En

A new method has been developed to determine trace levels of organophosphorus pesticide parathion-methyl in water samples by using dispersive liquid-liquid microextraction (DLLME), followed by gas chromatograph coupled with electron capture detector (GC/ECD) analysis. The optimized and validated method showed high extraction recovery (101.1%), high enrichment factor (57.3), low limits of detection and quantification, 0.083 and 0.250 µg L-1, respectively. The established DLLME-GC/ECD method has been successfully applied for the evaluation of the photodegradation of the parathion-methyl by UV254nm radiation in different conditions of pH and temperature. The parathion-methyl photodegradation at pH 3 and 35 °C achieved > 99.5% after 120 min of exposition. For this condition, it was observed the kinetic rate of 0.0515 min-1, the quantum yield of 1.22 × 10-5 mol Einstein-1 and a half-life time of 13.46 min. All experimental conditions tested proved to be strongly influenced by pH and temperature. The application of the optimized process in distilled and drinking water spiked with parathion-methyl provided residues of this pesticide at levels below the maximum permitted by Brazilian legislation, which is 9.0 µg L-1.

https://doi.org/10.21577/0103-5053.20170048 683 descargas

15.

First forensic records of termite activity on non-fossilized human bones in Brazil
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Queiroz, R. A.

; Soriano, E. P.

; Carvalho, M. V. D.

; Caldas-Junior, A. F.

; Souza, E. H. A.

; Coelho-Junior, L. G. T. M.

; Campello, R. I. C.

; Almeida, A. C.

; Farias, R. C. A. P.

; Vasconcellos, A.

Brazilian Journal of Biology

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Mar 2017, Volumen 77 Nº 1 Paginas 127 - 131

Resumen: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Resumo O objetivo deste estudo foi descrever os primeiros relatos de atividade de térmitas em ossos humanos não fossilizados, no Brasil. Os casos relatados neste estudo resultaram da análise pericial de seis esqueletos humanos encontrados no Nordeste do Brasil, entre os anos de 2012 e 2014. Vestígios de túneis e ninhos comumente produzidos por cupins foram encontrados em várias superfícies dos ossos humanos, bem como a presença de espécimes e característicos sinais de atividade osteofágica. Em quatro casos, foram identificadas as espécies: Amitermes amifer Silvestri, 1901, Nasutitermes corniger (Motschulsky, 1855) – em duas ossadas, e Microcerotermes indistinctus Mathews, 1977. Em dois outros casos, a atividade de cupins sobre superfícies ósseas foi evidenciada pelos restos de ninhos e túneis produzidos por esses insetos. Pelo menos nas amostras de restos humanos disponíveis para o presente estudo, o número de térmitas recolhido foi maior em ossos encontrados durante o outono, a estação chuvosa no Nordeste do Brasil. Os ossos humanos analisados apresentaram cupins como insetos com muita força na degradação óssea, com capacidade de prosseguir o processo de decomposição de restos humanos, mesmo em corpos completamente esqueletizados.

Abstract The aim of this study was to describe the first records of termite activity on non-fossilized human bones in Brazil. The cases reported in this study resulted from forensic analysis of six human skeletons found in northeastern Brazil between 2012 and 2014. Traces of tunnels and nests commonly produced by termites were found on several human bone surfaces as well as the specimens and characteristic signs of osteophagic activity. In four cases, the species were identified: Amitermes amifer Silvestri, 1901, Nasutitermes corniger (Motschulsky, 1855) (on two skeletons), and Microcerotermes indistinctus Mathews, 1977. In two other cases, the activity of termites on bone surfaces was evidenced by remains of nests and tunnels produced by these insects. At least in the samples of human remains available for this report, the number of termites collected was greater on bones found during autumn, the rainy season in the Northeast of Brazil. The human bones examined showed termites like insects with lots of strength at bone degradation, capable of continuing the process of decomposition of human remains even in completely skeletonized bodies.

https://doi.org/10.1590/1519-6984.11415 2464 descargas

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