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Registros recuperados: 39 | |
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Jerep,Fernando C.; Shibatta,Oscar A.. |
ABSTRACT Bryconamericus is the most diverse genus within Stevardiinae, comprising 61 valid species distributed in Cis- and Trans-Andean basins from Panama in Central America to northern Argentina in South America. Three species are known from the upper rio Paraná basin: B. exodon, B. iheringii, and B. turiuba. Herein we describe a new species of Bryconamericus from the upper rio Paraná basin inhabiting tributaries of Ivaí, Piquiri, and Tibagi basins, Paraná State, Brazil. The new species differs from its congeners by the presence of unaligned teeth in the outer tooth row of the premaxilla; a single, vertical, dorsally expanded and rounded humeral spot; 36-39 pored scales in the longitudinal series; body depth 31.6-37.9% SL; anal-fin base length 24.8-30.1%... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Actinopterygii; Characiformes; Geometric Morphometrics; PCA; Taxonomy. |
Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000300207 |
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HIGA, R. H.; GIACHETTO, P. F.; YAMAGISHI, M. E. B.; IBELLI, A. M. G.; REGITANO, L. C. de A.; CARDOSO, F. F.. |
O objetivo deste trabalho é apresentar a análise de agrupamento de dados de expressão gênica, conforme realizada no escopo da ?Rede Genômica Animal?. Na seção 2, são apresentados conceitos básicos sobre análises de agrupamento. Em particular, os algoritmos de agrupamento utilizados nessas análises compreendem aqueles mais conhecidos, como k-means, SOM e agrupamento hierárquico. A plataforma de análise escolhida para realização das análises de agrupamento na ?Rede Genômica Animal? é o ambiente de análise estatística R (R DEVELOPMENT CORE TEAM, 2010) e o projeto Bioconductor (GENTLEMAN et al., 2004). Assim, na seção 3 é apresentado um exemplo completo de análise de agrupamento e seu respectivo script R. |
Tipo: Folhetos |
Palavras-chave: Agrupamento de dados; Expressão gênica; Rede Genômica Animal; Análise de componentes principais; PCA; Análise Estatística; Gene expression; Algorithms; Statistical analysis; Principal component analysis. |
Ano: 2010 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/883623 |
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Tozetto,Adriana; Demiate,Ivo Mottin; Nagata,Noemi. |
Nos últimos vinte anos, o consumo de alimentos diet e light tem aumentado sistematicamente, o que tem propiciado o constante desenvolvimento de produtos desse gênero. Grande ênfase tem sido dada àqueles produtos que substituem sacarose por edulcorantes de baixos conteúdos calóricos ou não calóricos. Seguindo esta tendência, adoçantes de mesa têm sido desenvolvidos variando-se amplamente o veículo e o tipo de edulcorante empregado. Neste trabalho, a análise de componentes principais associada à espectroscopia na região do infravermelho médio foi utilizada com sucesso para diferenciar os veículos empregados na produção destes adoçantes, sendo que esta metodologia quimiométrica reduziu o espaço dimensional para dois fatores, explicando cerca de 82-% da... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adoçantes; Quimiometria; PCA; FTIR. |
Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612007000400008 |
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Rizzon,Luiz Antenor; Miele,Alberto. |
The production and commercialization of Brazilian grape juice is increasing annually, mainly due to its typicality, quality, and nutritional value. The present research was carried out in view of the great significance of Brazilian grape juice for the grape and wine industry. The purpose of this study, therefore, was to assess its composition as well as the discrimination between grape juice and other beverages. Twenty four samples of whole, sweetened, and reprocessed grape juices, grape nectar, and grape beverage were evaluated. Classical variables were analyzed by means of physicochemical methods; tartaric and malic acids, by HPLC; methanol, by gas chromatography; minerals, by atomic absorption spectrophotometry. These products were discriminated by the... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Grape juice; Grape nectar; Grape beverage; Composition; PCA. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612012000100014 |
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Valladares,Gustavo Souza; Camargo,Otávio Antônio de; Carvalho,José Ruy Porto de; Silva,Alessandra Maria Cia. |
Agricultural management with chemicals may contaminate the soil with heavy metals. The objective of this study was to apply Principal Component Analysis and geoprocessing techniques to identify the origin of the metals Cu, Fe, Mn, Zn, Ni, Pb, Cr and Cd as potential contaminants of agricultural soils. The study was developed in an area of vineyard cultivation in the State of São Paulo, Brazil. Soil samples were collected and GPS located under different uses and coverings. The metal concentrations in the soils were determined using the DTPA method. The Cu and Zn content was considered high in most of the samples, and was larger in the areas cultivated with vineyards that had been under the application of fungicides for several decades. The concentrations of... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: PCA; GIS; Soil pollution; Copper; Zinc. |
Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300011 |
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Cunha,A.F.; Lage,A.D.; Pereira e Araújo,M.M.; Santos,R.D.P.; Resende,G.M.; Cerqueira,M.M.O.P.. |
Embora métodos tradicionais sejam utilizados na avaliação microbiológica de produtos UAT, metodologias rápidas, baseadas em ATP-Bioluminescência, têm sido desenvolvidas. Os resultados da aplicação dessa técnica em 54 amostras de bebida láctea UAT achocolatada e 12 de creme de leite UAT foram comparados com os resultados de métodos microbiológicos, utilizando-se diferentes meios de cultura e tempos de incubação das referidas amostras. A técnica de ATP-Bioluminescência foi aplicada por meio do sistema MLS, e os resultados foram expressos em unidades relativas de luz (RLU). Em todos os tempos de incubação - 48, 72 e 168 horas - , as amostras apresentaram contagens baixas de microrganismos mesófilos e psicrotróficos aeróbios quando analisadas em meio PCA, BHI,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: UAT; ATP-Bioluminescência; PetrifilmTM AC; PCA; BHI. |
Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352013000200041 |
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P, Rajkumar; C, Dr. Indu Rani; N, Dr.Wang; G.S.V, Dr. Raghavan. |
A study was undertaken to classify the banana fruits based on their ripening/maturity by using zNose flavour detection technique. The quality parameters of banana fruits viz., respiratory quotient (RQ), total soluble solids (TSS), moisture content and firmness at each ripening/maturity stage were determined and the results were correlated with zNose flavour data. The principal component analysis (PCA) was used to identify the ripening/maturity stages of banana fruits and also to test the variability of the observed data. By using multiple linear regression (MLR), models were established to predict the fruit quality parameters. The coefficient of determination (r2) corresponding to the predicted respiratory quotient, total soluble solids, moisture content... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: E-Nose/Z-Nose; Banana fruits; Maturity; Ripening; PCA; MLR. |
Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3359 |
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LAK, MohammadBagher. |
Timely detection of water stress in agricultural crops is important. In this paper, a smart classification algorithm was developed to detect water stress in tomato plants that were grown in the greenhouse. During the growth period, thermal and visible light images were acquired from the canopy tops in two states: (1) plants in normal conditions; and (2) plants under water stress. Images were obtained using a camera that recorded simultaneous frames of thermal and visible (red, green, and blue (RGB)) features. Based on these features, 22 parameters were defined and applied to classify the image frames. In order to develop an efficient algorithm, principal component analysis (PCA) was applied to optimize the classifying of parameters. For normalizing the... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Image classification; MLPNN; Normalization; PCA; Precision farming. |
Ano: 2021 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6343 |
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Miele,Alberto; Rizzon,Luiz Antenor; Zanus,Mauro Celso. |
This work evaluated the physicochemical composition of 171 red Brazilian wines from the 2006 vintage, which were represented by 21 varietals. These wines were produced by 58 Brazilian wineries in different regions of the country, with latitudes varying from 9º to 31º South. Physicochemical wine analysis was performed in the same year and discrimination in the viticultural regions, varietal wines, and wineries was performed by means of the principal component analysis (PCA). The main results show that wines from São Joaquim had higher values of A420, A520, A620, color intensity, total phenolic compounds, anthocyanins, and dry extracts, while those from Toledo had lower values of these variables; those from Vale do São Francisco had higher values of... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Physicochemical composition; Geographical origin; Grape cultivar; Wine company; PCA. |
Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612010000100039 |
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SILVA,Karolline Marques da; ZIELINSKI,Acácio Antonio Ferreira; BENVENUTTI,Laís; BORTOLINI,Débora Gonçalves; ZARDO,Danianni Marinho; BELTRAME,Flávio Luís; NOGUEIRA,Alessandro; ALBERTI,Aline. |
Abstract The effect of the variety (Gala, Lis Gala and Fuji Suprema) and the ripening stage (unripe, ripe and senescent) of apples on the phenolic compounds (HPLC) and antioxidant capacity (FRAP and DPPH) of apple juices and ciders were evaluated. The phenolic content of the Gala and Lis Gala apple juices decreased from the unripe to ripe stages and increased from the ripe to the senescent stages, while in the case of Fuji Suprema these values decreased with senescence. Fermentation caused a reduction (17 to 50%) of phenolics and the most affected were hydroxycinnamic acids and flavanols. Principal component analysis confirmed the influence of variety, and the use of multivariate regression (PLS) made it possible to create significant models (p < 0.05)... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phenolic classes; HPLC; PCA; Multivariate regression PLS; FRAP; DPPH. |
Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612019000200294 |
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Villegas Cornelio, Víctor Manuel. |
Para el análisis de hidrocarburos en muestras de suelos contaminados existen diversos métodos, entre ellos, el más común es el Soxhlet, pero este implica etapas de pretratamiento, extracción, purificación-concentración y análisis. Sin embargo, estos procesos conllevan a la destrucción de las muestras, uso de reactivos y alto costo del análisis. No obstante, con el desarrollo de métodos instrumentales estas etapas se reducen, con la ventaja de disminuir al mínimo la manipulación de las muestras, el tiempo de análisis, el uso de reactivos químicos y las muestras no se destruyen en el análisis. La Espectroscopía de Infrarrojo Cercano (NIRS) como tecnología moderna proporciona datos sobre la naturaleza física y química de la muestra, con la generación de... |
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Palavras-chave: Gleysol Contaminación Petróleo crudo Quimiometría Degradación de TPH; PCA; LDA; SIMCA; PLS. Pollution Crude oil Chemometrics Degradation of TPH; PCA; LDA; SIMCA; PLS. Maestría Producción Agroalimentaria en el Trópico. |
Ano: 2010 |
URL: http://hdl.handle.net/10521/239 |
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Villegas Cornelio, Víctor Manuel. |
Para el análisis de hidrocarburos en muestras de suelos contaminados existen diversos métodos, entre ellos, el más común es el Soxhlet, pero este implica etapas de pretratamiento, extracción, purificación-concentración y análisis. Sin embargo, estos procesos conllevan a la destrucción de las muestras, uso de reactivos y alto costo del análisis. No obstante, con el desarrollo de métodos instrumentales estas etapas se reducen, con la ventaja de disminuir al mínimo la manipulación de las muestras, el tiempo de análisis, el uso de reactivos químicos y las muestras no se destruyen en el análisis. La Espectroscopía de Infrarrojo Cercano (NIRS) como tecnología moderna proporciona datos sobre la naturaleza física y química de la muestra, con la generación de... |
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Palavras-chave: Gleysol Contaminación Petróleo crudo Quimiometría Degradación de TPH; PCA; LDA; SIMCA; PLS. Pollution Crude oil Chemometrics Degradation of TPH; PCA; LDA; SIMCA; PLS. Maestría Producción Agroalimentaria en el Trópico. |
Ano: 2010 |
URL: http://hdl.handle.net/10521/239 |
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Santana,Genilson Pereira; Barroncas,Priscila de Souza Rosa. |
Os resíduos gerados em domicílios incluem diversos produtos, como pesticidas, produtos farmacêuticos, detergentes, óleos de cozinha, metais pesados contidos em baterias e outros utensílios. Esses resíduos são lançados continuamente em aterro sanitário ou lixões em cidades como Manaus. O chorume produzido nesses aterros, quando não tratados, contamina recursos hídricos superficiais e subterrâneos. Neste estudo foi feita uma avaliação das conseqüências da liberação do chorume no sistema hídrico da bacia do Tarumã-Açu. Amostras de água e sedimento foram coletadas nos igarapés Matrinxã, Acará, Bolívia, bacia do Tarumã-Açu e dentro do aterro sanitário (Manaus - Amazonas - Brasil) em março 2001. As amostras de água foram filtradas em filtro Milipore (0,45 mm de... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Metais pesados; Aterro sanitário; AAS; PCA; HCA. |
Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672007000100013 |
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Santos,Éder José dos; Baika,Loana Mara; Herrmann,Amanda Beatriz; Kulik,Suzete; Sato,Charyane Satie; Santos,Arlene Bispo dos; Curtius,Adilson José. |
A method for evaluating inorganic constituents in the grass by ICP OES is proposed. The samples were digested with nitric acid plus hydrogen peroxide in a microwave system. Seventeen samples were collected in the metropolitan area of Curitiba and Castro in the Paraná State, Brazil. The following elements were studied: Al, As, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Mo, Na, Ni, P, Pb, Sb, Se and Zn. The linear coefficients of the curves were higher than 0.999 and the precision, expressed as the relative standard deviation, which was below 10%, being considered adequate. The accuracy was validated by using the recovery test (recoveries from 80 to 107%) and by the analysis of botanical certified materials. For one sample, two other digestion procedures, using... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: ICP OES; Inorganic constituents; Acid digestion; PCA. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000300017 |
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Carrasco,Basilio; Díaz,Carole; Moya,Mario; Gebauer,Marlene; García-González,Rolando. |
The genetic characterization of 29 elite Japanese plum cultivars (Prunus salicina) and 4 Prunus cultivars was carried out by analyzing 97 Simple Sequence Repeat (SSR) alleles and 232 binary Inter Simple Sequence Repeat (ISSR) loci. A high level of genetic variability was found for these two molecular markers among the Japanese plum cultivars compared to other Prunus species. On average, the variability found by analyzing the SSR alleles were Na = 12.1, Ne = 5.2, Ho = 0.9, He = 0.8 and F= -0.127, whereas ISSR yielded values of h = 0.15 and I = 0.27. The genetic relationship among cultivars was estimated with Principal Coordinate Analysis (PCA) and a Bayesian clustering approach using the software program Structure. This program identified two subgroups... |
Tipo: Journal article |
Palavras-chave: AMOVA; Bayesian analysis; Genetic distance; PCA; Plum; Structure. |
Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300012 |
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Klein, N.; Houssaye, A.; Neenan, J.M.; Scheyer, T.M.. |
Placodontia, an enigmatic group of durophagous and in part heavily armoured animals, were members of Sauropterygia, the most diverse and successful group of Mesozoic marine reptiles. Microanatomy and histology of long bones of several armoured and non-armoured Placodontia were studied, covering most of their taxonomic breadth, to elucidate the paleoecology, physiology, and lifestyle of its members. Results reveal an unexpected and not phylogenetically or stratigraphically related disparity of microanatomical and histological features for the group. The non-armoured Paraplacodus and the heavily armoured Psephoderma grew with lamellar-zonal bone tissue type, which is typical for modern sauropsids. In the former, the tissue is nearly avascular surrounding a... |
Tipo: Article / Letter to the editor |
Palavras-chave: Bone mass increase; Bone tissue types; Extinct marine reptiles; High growth rates; PCA; Swimming capabilities; Triassic; 38.22. |
Ano: 2015 |
URL: http://www.repository.naturalis.nl/record/521679 |
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Registros recuperados: 39 | |
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