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A new species of Bryconamericus (Characidae: Stevardiinae: Diapomini) from the upper rio Paraná basin, Brazil Neotropical Ichthyology
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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Análise exploratória de adoçantes de mesa via espectroscopia no infravermelho (FTIR) e análise por componentes principais (ACP) Ciênc. Tecnol. Aliment.
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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Analytical characteristics and discrimination of Brazilian commercial grape juice, nectar, and beverage Ciênc. Tecnol. Aliment.
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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Aroma characteristics and volatile compounds of distilled Crystal grape spirits of different alcohol concentrations: wine sprits in the Shangri-La region of China Ciênc. Tecnol. Aliment.
WEI,Xiao-Feng; MA,Xue-Lei; CAO,Jian-Hong; SUN,Xiang-Yu; FANG,Yu-Lin.
Abstract Aroma composition is critical to the quality of distilled spirits while the alcohol concentration could have a great effect on the variety and content of aromatic substances. In order to clarify the effect of alcohol concentration on the formation of the aroma composition, volatile compounds in Crystal distilled grape spirits with different alcohol concentrations were analyzed using the Stir bar sorptive extraction (SBSE) technique combined with GC-MS. Characteristic aromas, principal components and odor profiles were also explored. Eighty-six compounds were identified in Crystal distilled grape spirits and 19 compounds were the same for the 4 samples with different alcohol concentrations. The species and contents of esters increased...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alcohol; Aroma; Crystal distilled grape spirits; Odor; PCA.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612018000500050
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Assessment of heavy metals in soils of a vineyard region with the use of principal component analysis Scientia Agricola
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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Avaliação da qualidade microbiológica de bebida láctea e creme de leite UAT por ATP-Bioluminescência Arq. Bras. Med. Vet. Zootec.
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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Characterization of commercial cooked hams according to physicochemical, sensory, and textural parameters using chemometrics Ciênc. Tecnol. Aliment.
Los,Francine Gomes Basso; Granato,Daniel; Prestes,Rosa Cristina; Demiate,Ivo Mottin.
Cooked ham is considered a high-value product due to the quality of its raw material. Although its consumption is still low in Brazil, it is increasing due to the rising purchasing power of sectors of the population. This study aimed to assess the microbiological, physicochemical, rheological, and sensory quality of cooked hams (n=11) marketed in Brazil. All samples showed microbiological results within the standards established by Brazilian legislation. Eight of the eleven samples studied met all the legal requirements; two samples violated the standards due to the addition of starch; one sample had lower protein content than the minimum required, and another one had sodium content higher than that stated on the label. The use of Hierarchical Cluster...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Microbiology; Quality; HCA; PCA.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612014000300021
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Classification of Banana Fruit Maturity using zNose CIGR Journal
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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Discrimination of Brazilian red wines according to the viticultural region, varietal, and winery origin Ciênc. Tecnol. Aliment.
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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Effect of fruit ripening on bioactive compounds and antioxidant capacity of apple beverages Ciênc. Tecnol. Aliment.
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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Effects of CO2 pretreatment on the volatile compounds of dried Chinese jujube (Zizyphus jujuba Miller) Ciênc. Tecnol. Aliment.
CHEN,Kai; GAO,Lei; LI,Qiong; LI,Huan-Rong; ZHANG,Yanyan.
Abstract The aim of this study was to investigate whether anaerobic metabolites could induce volatile compounds and improve aroma of dried jujube (Ziziphus jujuba Miller). Jujube fruits were incubated in a polyvinyl chloride bag containing 5% CO2 and 95% N2 for up to 168 h at 25 °C and 3 samples were randomly removed every 6 h and oven dried to a moisture content of ≅ 20%. The volatile compounds of control and 5% CO2-pretreated Chinese jujube fruits were extracted by simultaneous distillation extraction and identified by gas chromatography-mass spectrometry(GC-MS). The acetaldehyde and ethanol contents were determined by gas chromatography (GC). The results indicated that a large accumulation of acetaldehyde and ethanol caused changes in aroma composition...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Simultaneous distillation extraction; Anaerobic metabolites; Volatile compounds; Dried jujube; PCA.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612017000400578
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Estudio de la degradación de hidrocarburos en suelos mediante la técnica de infrarrojo cercano. Colegio de Postgraduados
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...
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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Estudio de la degradación de hidrocarburos en suelos mediante la técnica de infrarrojo cercano. Colegio de Postgraduados
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...
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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Estudo de metais pesados (Co, Cu, Fe, Cr, Ni, Mn, Pb e Zn) na Bacia do Tarumã-Açu Manaus (AM) Acta Amazonica
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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Fast assessment of mineral constituents in grass by inductively coupled plasma optical emission spectrometry BABT
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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Genetic characterization of Japanese plum cultivars (Prunus salicina) using SSR and ISSR molecular markers Ciencia e Investigación Agraria
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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Long bone histology and microanatomy of Placodontia (Diapsida: Sauropterygia) Naturalis
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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Middle infrared spectroscopy characterization of ripening stages of Camembert-type cheeses. Inra
Martin-del-Campo, S.T.; Picque, D.; Cosio-Ramirez, R.; Corrieu, G..
Mould-ripened soft cheeses like Camembert produced at pilot scale were analyzed in order to evaluate the potential of mid-infrared spectroscopy to follow the ripening phenomena. Two cheese zones (core and under-rind) were analyzed directly and were then fractionated by selective precipitation to obtain more specific parts. Cheese slices and their fractions were analyzed by attenuated total reflectance. Analysis of variance showed the significant absorbance changes on spectra sets, mainly in the regions assigned to the vibrations of alcohol and amide groups. By principal component analysis of spectral data, two different steps of ripening can be described. The spectral studies of other fractions than whole cheese provided no additional information. Using...
Tipo: Journal Article Palavras-chave: MID-INFRARED SPECTROSCOPY; CHEESE RIPENING; CAMEMBERT; SPECTRAL EVOLUTION; PCA; PLS.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008b6cbc9ca&uri=/notices/prodinra1/2008/05/
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Mineralización de nitrógeno de diferentes abonos orgánicos Colegio de Postgraduados
Córdova Ballona, Georgina.
El uso de fertilizantes orgánicos es una buena alternativa en todos los sistemas de producción agrícola, sobre todo si el fin principal es proveer N, mejorar la fertilidad de los suelos y el mantener o incrementar los rendimientos de los cultivo. El nitrógeno es uno de los nutrimentos que en mayor cantidad demandan los cultivos, una vez aplicado tiene gran dinámica, lo cual, aunado a propiedades indeseables del suelo favorecen su pérdida. El uso de materiales orgánicos en la agricultura tiene múltiples propósitos, van desde el aprovechamiento de subproductos hasta el incremento de la sustentabilidad de los agroecosistemas. No obstante la importancia que tienen los materiales orgánicos, para la zona de estudio existen pocos trabajos que consideren aspectos...
Palavras-chave: Manure; Mineralization; NIRS; Quimiometría; PCA; Producción Agroalimentaria en el Trópico; Maestría.
Ano: 2010 URL: http://hdl.handle.net/10521/100
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Mineralización de nitrógeno de diferentes abonos orgánicos Colegio de Postgraduados
Córdova Ballona, Georgina.
El uso de fertilizantes orgánicos es una buena alternativa en todos los sistemas de producción agrícola, sobre todo si el fin principal es proveer N, mejorar la fertilidad de los suelos y el mantener o incrementar los rendimientos de los cultivo. El nitrógeno es uno de los nutrimentos que en mayor cantidad demandan los cultivos, una vez aplicado tiene gran dinámica, lo cual, aunado a propiedades indeseables del suelo favorecen su pérdida. El uso de materiales orgánicos en la agricultura tiene múltiples propósitos, van desde el aprovechamiento de subproductos hasta el incremento de la sustentabilidad de los agroecosistemas. No obstante la importancia que tienen los materiales orgánicos, para la zona de estudio existen pocos trabajos que consideren aspectos...
Palavras-chave: Manure; Mineralization; NIRS; Quimiometría; PCA; Producción Agroalimentaria en el Trópico; Maestría.
Ano: 2010 URL: http://hdl.handle.net/10521/100
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