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| Registros recuperados: 39 | |
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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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| 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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| 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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| 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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| Singh,Diwakar; Radhakrishnan,T.; Kumar,Vinod; Bagwan,N.B.; Basu,M.S.; Dobaria,J.R.; Mishra,Gyan P.; Chanda,S.V.. |
| Aflatoxin contamination of peanut, due to infection by Aspergillus flavus, is a major problem of rain-fed agriculture in India. In the present study, molecular characterisation of 187 Aspergillus flavus isolates, which were sampled from the peanut fields of Gujarat state in India, was performed using AFLP markers. On a pooled cluster analysis, the markers could successfully discriminate among the ‘A’, ‘B’ and ‘G’ group A. flavus isolates. PCoA analysis also showed equivalent results to the cluster analysis. Most of the isolates from one district could be clustered together, which indicated genetic similarity among the isolates. Further, a lot of genetic variability was observed within a district and within a group. The results of AMOVA test revealed that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aflatoxin; AMOVA; ELISA; Genetic diversity; Groundnut; PCA. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000300673 |
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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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| 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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| Jaster,Henrique; Campos,Anna Carolina Leonelli Pires de; Auer,Luciellen Bach; Los,Francine Gomes Basso; Salem,Renata Dinnies Santos; Esmerino,Luís Antônio; Nogueira,Alessandro; Demiate,Ivo Mottin. |
| Parmesan-type cheeses are the most consumed special cheeses in Brazil. It is generally sold in retail shops, either grated or in wedge-shaped pieces, and its quality varies considerably, which is reflected directly in its price. There is lack of processing standardization and, since the ripening period is fundamental for the quality of this hard, semi-fat cooked cheese, this stage seems to be the thin line between low and high quality products. It is important to note that the Italian Parmegiano Reggiano is matured for a period of twelve months, as well as its rival Grana Padano, and this long ripening period causes changes making them gourmet, highly-valued cheeses. In the present study, twelve different Parmesan-type cheeses were purchased from the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cheese; Microbiology; Chemical composition; Texture; PCA; HCA. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612014000100026 |
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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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| 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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| Reyes Sánchez, Carlos Augusto. |
| Para tipificar miel existen diferentes alternativas metodológicas, en donde los procedimientos utilizados para resolver la mayoría de los problemas implican obtener información sobre los compuestos individuales de la mezcla. Cuando el problema no es qué contiene la muestra sino determinar su identidad la solución puede ser mediante señales de perfil (huellas espectrales) de un grupo de compuestos. La información contenida en las huellas espectrales se extrae mediante técnicas quimiométricas. Los métodos instrumentales modernos (espectroscopia de infrarrojo cercano, cromatografía de gases, espectrometría de masas acoplada a un generador de espacio de cabeza, espectroscopia UV-Vis, etc.), presentan gran interés principalmente por su elevada velocidad de... |
| Tipo: Tesis |
Palavras-chave: Miel mexicana; Tipificación; Quimiometría; HCA; PCA; Maestría; Producción Agroalimentaria en el Trópico.; Mexican honey; Typifying; Chemometric treatment. |
| Ano: 2009 |
URL: http://hdl.handle.net/10521/1669 |
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| Vázquez Hernández, Lorena. |
| El control de calidad de los productos agroalimentarios está basado en su caracterización bioquímica, como una de las partes esenciales. Para el caso del café, la composición química está fuertemente relacionada con las condiciones agroecológicas (suelo, clima, altura, etc.) de cada una de las regiones productoras. El café es la segunda materia prima en importancia en el mercado nacional, por lo cual, la calidad es importante para este producto. Para asegurarnos de la calidad del café tanto para los consumidores como productores existe la necesidad de establecer métodos analíticos, rápidos, objetivos y sensitivos. Para realizar la caracterización del café comercial existen métodos convencionales establecidos en la Norma Mexicana (NMX-F-013-SCFI-2000),... |
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Palavras-chave: Café; Quimiometría; NIRS; Homogeneidad; PCA; SIMCA; Coffee; Chemometrics; Homogeneity; Maestría; Producción Agroalimentaria en el Trópico. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/561 |
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| Registros recuperados: 39 | |
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