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Registros recuperados: 63
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A method to determine volatile contaminants in polyethylene terephthalate (PET) packages by HDC-GC-FID and its application to post-consumer materials Ciênc. Tecnol. Aliment.
Fabris,Samanta; Freire,Maria Teresa de Alvarenga; Wagner,Roger; Reyes,Felix Guillermo.
A simple and low cost method to determine volatile contaminants in post-consumer recycled PET flakes was developed and validated by Headspace Dynamic Concentration and Gas Chromatography-Flame Ionization Detection (HDC-GC-FID). The analytical parameters evaluated by using surrogates include: correlation coefficient, detection limit, quantification limit, accuracy, intra-assay precision, and inter-assay precision. In order to compare the efficiency of the proposed method to recognized automated techniques, post-consumer PET packaging samples collected in Brazil were used. GC-MS was used to confirm the identity of the substances identified in the PET packaging. Some of the identified contaminants were estimated in the post-consumer material at concentrations...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Extraction; Validation; Gas chromatography; PET packaging.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612010000400033
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A Multivariate Regression Approach to Adjust AATSR Sea Surface Temperature to In Situ Measurements ArchiMer
Tandeo, Pierre; Autret, Emmanuelle; Piolle, Jean-francois; Tournadre, Jean; Ailliot, Pierre.
The Advanced Along-Track Scanning Radiometer (AATSR) onboard Envisat is designed to provide very accurate measurements of sea surface temperature (SST). Using colocated in situ drifting buoys, a dynamical matchup database (MDB) is used to assess the AATSR-derived SST products more precisely. SST biases are then computed. Currently, Medspiration AATSR SST biases are discrete values and can introduce artificial discontinuities in AATSR level-2 SST fields. The new AATSR SST biases presented in this letter are continuous. They are computed, for nighttime and best proximity confidence data, by linear regression with different MDB covariables (wind speed, latitude, aerosol optical depth, etc.). As found, the difference between dual-view and nadir-only SST...
Tipo: Text Palavras-chave: Validation; Sea surface temperature (SST); Remote sensing; Advanced Along Track Scanning Radiometer (AATSR).
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6135.pdf
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Age estimation in common sole Solea solea larvae: validation of daily increments and evaluation of a pattern recognition technique ArchiMer
Lagardere, Françoise; Troadec, Herve.
Close similarities have been found between the otoliths of sea-caught and laboratory-reared larvae of the common sole Solea solea (L.), given appropriate temperatures and nourishment of the latter. But from hatching to mouth formation. and during metamorphosis, sole otoliths have proven difficult to read because the increments may be less regular and low contrast. In this study, the growth increments in otoliths of larvae reared at 12 degrees C were counted by light microscopy to test the hypothesis of daily deposition, with some results verified using scanning electron microscopy (SEM), and by image analysis in order to compare the reliability of the 2 methods in age estimation. Age was first estimated (in days posthatch) from light micrographs of whole...
Tipo: Text Palavras-chave: Larval sole; Solea solea; Otolith; Daily increment; Validation; Image analysis.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00337/44785/44488.pdf
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AN INTERACTIVE SOFTWARE PACKAGE FOR VALIDATING SATELLITE DATA Gayana
Muraleedharan,P.M.; Pankajakshan,T..
Earth observation satellite launched in the last three decades have made vital contributions to the understanding of the planet. The earth system consisting of land, oceans and atmosphere is linked together by a number of complicated processes. Potential of microwave sensors in studying the boundary layer dynamics of the ocean-atmosphere system is well documented. Technology has revolutionized the application of such sensors and several missions are planned to take off in near future for meeting specific objectives. Launching of such sensors need to be followed by an extensive validation campaign for providing accurate and reliable information to the users. A PC-based interactive system has been developed and presented here for validating satellite mounted...
Tipo: Journal article Palavras-chave: Validation; Microwave sensor; Autocorrelation; Sea surface temperature; Wind speed; Columnar water vapor.
Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300018
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An Unstructured Numerical Model to Study Wind-Driven Circulation Patterns in a Managed Coastal Mediterranean Wetland: The Vaccares Lagoon System ArchiMer
Boutron, Olivier; Bertrand, Olivier; Fiandrino, Annie; Hoehener, Patrick; Sandoz, Alain; Cherain, Yves; Coulet, Eric; Chauvelon, Philippe.
The spatiotemporal structure of wind-driven circulation patterns and associated water exchanges can drive important bio-hydrodynamic interactions in shallow lagoons. The Vaccares lagoon system is a complex shallow hydrosystem located in the central part of the Rhone Delta (France). It is internationally recognized as part of a biosphere reserve within the framework of UNESCO's Man and Biosphere Programme, and as a RAMSAR site. Due to its frequent occurrence in this area, and considering the shallowness of the Vaccares lagoon system, wind is assumed to play a major role in the hydrodynamic and biological processes. In this study, a hydrodynamic model was developed to investigate the structure of wind-driven circulations in the Vaccares lagoon system, to...
Tipo: Text Palavras-chave: Coastal lagoon; Mathematical model; Hydrodynamics; Calibration; Validation; Wind-driven circulation.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00303/41382/40558.pdf
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Analytical validation of LAL kinetic assay for detection and quantification of endotoxins in measles's vaccine diluents BABT
Guimarães,Rosane Cuber; Leal,Alaide Aline Xavier.
Method validation is the process used to confirm that the analytical procedures employed for a specific test is able to produce reliable and replicable results. An analytical method should be conducted in order to demonstrate that it is suitable for its intended use [1]. The aim of this present work is to demonstrate and evaluate the suitability of method validation. The analytical validation discussed herein was conducted by prescribed protocol, using 3 different batches of measles's vaccine diluents. All of the stipulated validation parameters: linearity, repeatability, reproducibility (intermediate precision) and accuracy were met. Additionally, this study demonstrated the method's capability for the determining endotoxin levels in measles's vaccine...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bioanalytical method; Endotoxin; Validation.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000200010
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Application du modèle MARS-3D à la rade de Toulon. Comparaison à des données historiques ArchiMer
Tessier, Caroline.
Développé par le laboratoire DEL/AO à Brest et appliqué à la rade de Toulon, le modèle MARS-3D a été installé au laboratoire de Toulon. L'objectif est de mettre en route son application à Toulon et de contribuer à l'analyse en cours des résultats du modèle, en les· comparant aux mesures historiques. Dans ce rapport sont présentés les travaux faits pour réaliser ce double objectif: l'apprentissage du modèle dans sa conception et son utilisation, l'analyse des résultats et la comparaison avec des mesures ainsi qu'une simulation de traceurs. La comparaison du modèle avec les données a été réalisée sur la base des enregistrements faits en 1986-1987 en un point de mesure au centre de la grande rade. Or, l'emboîtement des modèles crée une contrainte sur le...
Tipo: Text Palavras-chave: Modèle; Tridimensionnel; Méditerranée; Hydrodynamique; Validation; Toulon.
Ano: 2001 URL: https://archimer.ifremer.fr/doc/00431/54248/59141.pdf
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Assessment of molecular recognition element for the quantification of human epidermal growth factor using surface plasmon resonance Electron. J. Biotechnol.
Rosti,Ira Amira; Ramanan,Ramakrishnan Nagasundara; Ling,Tau Chuan; Ariff,Arbakariya B.
Background: A method for the selection of suitable molecular recognition element (MRE) for the quantification of human epidermal growth factor (hEGF) using surface plasmon resonance (SPR) is presented. Two types of hEGF antibody, monoclonal and polyclonal, were immobilized on the surface of chip and validated for its characteristics and performance in the quantification of hEGF. Validation of this analytical procedure was to demonstrate the stability and suitability of antibody for the quantification of target protein. Results: Specificity, accuracy and precision for all samples were within acceptable limit for both antibodies. The affinity and kinetic constant of antibodies-hEGF binding were evaluated using a 1:1 Langmuir interaction model. The model...
Tipo: Journal article Palavras-chave: Antibody; BIAcore; Biosensors; Epidermal growth factor; Validation.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600015
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Assessment of SARAL/AltiKa Wave Height Measurements Relative to Buoy, Jason-2, and Cryosat-2 Data ArchiMer
Hito Sepulveda, Hector; Queffeulou, Pierre; Ardhuin, Fabrice.
SARAL/AltiKa GDR-T are analyzed to assess the quality of the significant wave height (SWH) measurements. SARAL along-track SWH plots reveal cases of erroneous data, more or less isolated, not detected by the quality flags. The anomalies are often correlated with strong attenuation of the Ka-band backscatter coefficient, sensitive to clouds and rain. A quality test based on the 1Hz standard deviation is proposed to detect such anomalies. From buoy comparison, it is shown that SARAL SWH is more accurate than Jason-2, particularly at low SWH, and globally does not require any correction. Results are better with open ocean than with coastal buoys. The scatter and the number of outliers are much larger for coastal buoys. SARAL is then compared with Jason-2 and...
Tipo: Text Palavras-chave: Radar altimeter; Significant wave height; Satellite; SARAL; AltiKa; Validation.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00286/39675/38199.pdf
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Cadmium voltametric quantification in table chocolate produced in Chiquinquira-Boyaca, Colombia Acta Agron. (Palmira)
Chaparro-Acuña,Sandra Patricia; Vargas-Moreno,Paola Andrea; Silva-Gómez,Leonardo Andrés; Cárdenas,Oswaldo Eliécer.
Abstract: Bioaccumulation of heavy metals such as cadmium has been a major concern in scientific communities and international food organizations, given the great toxicological risk to the consumer, and in many places there is no detailed record of its actual content. In this way, the need arises to carry out a study and registration of the concentration of this metal in products such as table chocolate, of great consumption at regional and national level. Likewise, we seek to have effective quantification tools and a reliable and affordable method to achieve the aim of this research. In this research, Cadmium content in powdered and granulated table chocolate was determined, elaborated and commercialized in the municipality of Chiquinquira,...
Tipo: Journal article Palavras-chave: Food; Cocoa; Electrochemistry; Heavy metals; Validation.
Ano: 2017 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000200172
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Calibration and Validation of SWAT for the Upper Maquoketa River Watershed AgEcon
Kanwar, Ramesh S.; Reungsang, Pipat; Jha, Manoj K.; Gassman, Philip W.; Ahmad, Khalil; Saleh, Ali.
A validation study has been performed using the Soil and Water Assessment Tool (SWAT) model with data collected for the Upper Maquoketa River Watershed (UMRW), which drains over 16,000 ha in northeast Iowa. This validation assessment builds on a previous study with nested modeling for the UMRW that required both the Agricultural Policy EXtender (APEX) model and SWAT. In the nested modeling approach, edge-of-field flows and pollutant load estimates were generated for manure application fields with APEX and were then subsequently routed to the watershed outlet in SWAT, along with flows and pollutant loadings estimated for the rest of the watershed routed to the watershed outlet. In the current study, the entire UMRW cropland area was simulated in SWAT, which...
Tipo: Working or Discussion Paper Palavras-chave: Calibration; Modeling; Nitrate; SWAT; Validation; Water quality; Resource /Energy Economics and Policy.
Ano: 2005 URL: http://purl.umn.edu/18440
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Compuestos volátiles que median la interacción entre Anthonomus eugenii Cano y Capsicum annuum L. Colegio de Postgraduados
Velázquez González, Julio César.
Dado que el picudo del chile es el principal problema fitosanitario en el cultivo de Capsicum spp., y las medidas de control no han logrado mitigar de forma eficiente las poblaciones de este insecto, se estudiaron los siguientes objetivos con el fin de conocer las interacciones planta insecto. Primero se valido un método de recolecta de volátiles, el cual demostró ser eficiente bajo las diferentes variables analíticas estudiadas, con % de recobro de 90-100 y DER menores a 10%. En segundo lugar se evaluó el potencial atrayente de estructuras de la planta como flores, yemas, frutos en desarrollo y frutos comerciales, encontrando que machos prefieren en primer lugar flores y después yemas, y las hembras en su primera opción eligieron yemas y después flores....
Palavras-chave: Validación; Feromona; Capsicum; Sensilla; Cromatografía; Validation; Pheromone; Chromatography; Entomología y Acarología; Doctorado.
Ano: 2011 URL: http://hdl.handle.net/10521/557
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Compuestos volátiles que median la interacción entre Anthonomus eugenii Cano y Capsicum annuum L. Colegio de Postgraduados
Velázquez González, Julio César.
Dado que el picudo del chile es el principal problema fitosanitario en el cultivo de Capsicum spp., y las medidas de control no han logrado mitigar de forma eficiente las poblaciones de este insecto, se estudiaron los siguientes objetivos con el fin de conocer las interacciones planta insecto. Primero se valido un método de recolecta de volátiles, el cual demostró ser eficiente bajo las diferentes variables analíticas estudiadas, con % de recobro de 90-100 y DER menores a 10%. En segundo lugar se evaluó el potencial atrayente de estructuras de la planta como flores, yemas, frutos en desarrollo y frutos comerciales, encontrando que machos prefieren en primer lugar flores y después yemas, y las hembras en su primera opción eligieron yemas y después flores....
Palavras-chave: Validación; Feromona; Capsicum; Sensilla; Cromatografía; Validation; Pheromone; Chromatography; Entomología y Acarología; Doctorado.
Ano: 2011 URL: http://hdl.handle.net/10521/557
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Contribution à la validation de la technique de PCR pour la détection du parasite Bonamia ostreae chez l'huître plate, Ostrea edulis ArchiMer
Dubois, Rodolphe.
Bonamia ostreae, l'agent de la bonamiose, est un parasite intracellulaire ayant pour cible les hémocytes (cellules du système de défense) de l'huître plate ostrea edulis. Il induit chez son hôte des lésions branchiales, telles que des perforations ou des indentations pouvant aller jusqu'à la mort du mollusque. Le travail réalisé au cours de ce stage s'inscrivait dans une démarche de validation de méthode de PCR (Polymerase Chain Reaction) pour la détection de ce parasite. Les analyses ont porté sur un lot de trois cent onze huîtres plates ostrea edulis adultes (2-3 ans), issus de captage naturel et provenant de Quiberon (Bretagne). Pour chaque individu, une extraction d'ADN a été réalisée sur un échantillon de coeur et de branchies. Afin de déterminer si...
Tipo: Text Palavras-chave: Bonamia Ostreae; Agent pathogène; Bonamiose; Hémocytes; Huître plate; Ostrea edulis; PCR; Validation.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00369/47989/48017.pdf
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Determining the site index of Teak (Tectona grandis L.) plantations in Tabasco, Mexico Ciencia e Investigación Agraria
Minoche,Djhon; Herrero,Celia; Dominguez-Dominguez,Marivel; Martinez-Zurimendi,Pablo.
Abstract Forest stand productivity is defined as the quantitative estimation of a specific area's potential to produce biomass over a determined period of time. The site index has been the predominant method used to evaluate forest stand productivity. Teak is one of the most accepted species within the international timber market due to the physical and aesthetic qualities of this wood. The aim of this study was to determine the site index of teak plantations. The study was conducted in teak plantations of Tabasco. Data were obtained from a network of 10 plantations consisting of 35 plots measured over four successive inventories (2003 to 2006). The data were fitted to five models, of which four were based on proposed finite difference equations and a...
Tipo: Journal article Palavras-chave: Finite difference equations; Forest productivity; Inventory; Non-integrated function; Validation.
Ano: 2017 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000200154
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Development and optimization of a HPLC-RI method for the determination of major sugars in apple juice and evaluation of the effect of the ripening stage Ciênc. Tecnol. Aliment.
Zielinski,Acácio Antonio Ferreira; Braga,Cíntia Maia; Demiate,Ivo Mottin; Beltrame,Flávio Luís; Nogueira,Alessandro; Wosiacki,Gilvan.
The sugars in apple juice prove its authenticity and its sensory and nutritional properties. The aim of this study was to develop and validate a simple analytical method using high performance liquid chromatography with refractive index detection (HPLC-RI) to determinate and quantify the sugars sucrose, D-glucose, D-fructose, and D-sorbitol polyol in apple juices, as well as to analyze the juices from the Fuji suprema and Lis Gala cultivars at three ripening stages. The analytical performance parameters evaluated indicated that the method was specific for the compounds analyzed, and the linearity of the calibration curves of sugars showed high correlation coefficients (close to 1.0). The limits of detection and quantification are consistent with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Malus domestica; Soluble carbohydrates; Liquid chromatography; Validation.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612014000100005
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Development and validation of a method for detection and quantification of ochratoxin A in green coffee using liquid chromatography coupled to mass spectrometry Ciênc. Tecnol. Aliment.
Bandeira,Raquel Duarte da Costa Cunha; Uekane,Thaís Matsue; Cunha,Carolina Passos da; Cunha,Valnei Smarçaro da; Rodrigues,Janaína Marques; Godoy,Ronoel Luiz de Oliveira; la Cruz,Marcus Henrique Campino de.
A method using Liquid Chromatography Tanden Mass Spectrometry (LC-MS/MS) with matrix-matched calibration curve was developed and validated for determining ochratoxin A (OTA) in green coffee. Linearity was found between 3.0 and 23.0 ng.g-1. Mean recoveries ranged between 90.45% and 108.81%; the relative standard deviation under repeatability and intermediate precision conditions ranged from 5.39% to 9.94% and from 2.20% to 14.34%, respectively. The limits of detection and quantification were 1.2 ng.g-1 and 3.0 ng.g-¹, respectively. The method developed was suitable and contributed to the field of mycotoxin analysis, and it will be used for future production of the Certified Reference Material (CRM) for OTA in coffee.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coffee; Mycotoxin; Validation; HPLC; MS/MS.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612012000400021
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Development and validation of a microbiological assay for determination of chlorhexidine digluconate in aqueous solution BJPS
Fiorentino,Flávia Angélica Másquio; Corrêa,Marcos Antonio; Salgado,Hérida Regina Nunes.
Chlorhexidine (CHX) is a broad-spectrum antiseptic that is used in many topical pharmaceutical formulations. Because there is no official microbiological assay reported in the literature that is used to quantify CHX, this paper reports the development and validation of a simple, sensitive, accurate and reproducible agar diffusion method for the dosage of chlorhexidine digluconate (CHX-D) in an aqueous solution. The assay is based on the inhibitory effect of CHX-D upon the strain of Staphylococcus aureus ATCC 25923, which is used as the test microorganism. The design 3x3 parallel-line model was used. The results were treated statistically by analysis of variance (ANOVA), and they were excellent in terms of linearity (r = 0.9999), presenting a significant...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agar diffusion; Antiseptic; Chlorhexidine; Microbiological assay; Quality control; Validation.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502013000200017
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Development and validation of an analytical method using High Performance Liquid Chromatography (HPLC) to determine ethyl butylacetylaminopropionate in topical repellent formulations BJPS
Pinto,Isadora Cabral; Cerqueira-Coutinho,Cristal; Freitas,Zaida Maria Faria de; Santos,Elisabete Pereira dos; Carmo,Flávia Almada do; Ricci Junior,Eduardo.
ABSTRACT Diseases caused by insects are frequent in poor countries, leading to epidemic scenarios in urban areas; e.g., Dengue, Zika and Chikungunya. For this reason, the development of a safe and efficient topical formulation is essential. Ethyl butylacetylaminopropionate (EB) is a mosquito repellent developed by Merck, which is used in products for adults, children and especially babies, due to its low allergenic potential. The aim of this work was to validate an analytical methodology to quantify EB in a new poloxamer-based formulation by high-performance liquid chromatography (HPLC). The quantification methodology was performed at 40 ºC using a Kromasil reverse-phase column (C18), with the dimensions of 250 x 4.6 mm. The mobile phase was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ethyl butylacetylaminopropionate (EB)/quantification; Ethyl butylacetylaminopropionate (EB)/topical formulations; Analytical method; Validation; Repellents; Prophylaxis; High Performance Liquid Chromatography..
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502017000200613
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Development and validation of empirical models for the prediction of selected antioxidants in stored oranges CIGR Journal
OLUSHOLA, SUNMONU MUSLIU; ADESOJI, OLANIYAN MATHEW; JUNIOR, ADUBA JOSEPH.
Abstract: Empirical models were developed to predict some selected antioxidants present in stored oranges under a modified atmosphere.  Three sets of four different types of passive evaporative cooling structures made of two different materials; clay and aluminium were designed and constructed as part of the study.  One set consisted of four separate cooling chambers.  Two cooling chambers were made with aluminium container (cylindrical and rectangular shapes) and the other two were made of clay container (cylindrical and rectangular).  These four containers were separately inserted inside a bigger clay pot inter-spaced with clay soil of 5 cm (to form tin-in-pot, pot-in-pot, tin-in-wall and wall-in wall) with the outside structure wrapped with jute sack....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural Engineering/ Food Engineering model; Validation; Predicted; Structures; Oranges.
Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2757
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