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| Registros recuperados: 52 | |
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| Konn, Cecile; Charlou, Jean-luc; Donval, Jean-pierre; Holm, Nils G.. |
| The analysis of the dissolved organic fraction of hydrothermal fluids has been considered a real challenge due to sampling difficulties, complexity of the matrix, numerous interferences and the assumed ppb concentration levels. The present study shows, in a qualitative approach, that Stir Bar Sorptive Extraction (SBSE) followed by Thermal Desorption - Gas Chromatography - Mass Spectrometry (TD-GC-MS) is suitable for extraction of small sample volumes and detection of a wide range of volatile and semivolatile organic compounds dissolved in hydrothermal fluids. In a case study, the technique was successfully applied to fluids from the Rainbow ultramafic-hosted hydrothermal field located at 36 degrees 14'N on the Mid-Atlantic Ridge (MAR). We show that... |
| Tipo: Text |
Palavras-chave: Sample preparation; Extraction; Organic compounds; Hydrothermal fluids; Ultramafic rocks. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00114/22514/20196.pdf |
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| Mosbah, Amor; Delavenne, Emilie; Souissi, Yasmine; Mahjoubi, Mouna; Jehan, Philippe; Le Yondre, Nicolas; Cherif, Ameur; Bondon, Arnaud; Mounier, Jerome; Baudy-floc'H, Michele; Le Blay, Gwenaelle. |
| Lactobacillus harbinensis K.V9.3.1Np was described as endowed with high antifungal activity. Most of the studies associated this activity to the produced organic acids, i.e., lactic acid, acetic acid, and hexanoic acid. The aim of this study was to purify and identify, other not yet described, antifungal molecules produced by L. harbinensis K.V9.3.1 Np when used in yogurt fermentation. Active compounds were extracted through several extraction processes using organic solvents and protein precipitation. The fractions of interest were purified using flash chromatography and preparative HPLC for specific characterization. The bioactive compounds identification was performed using Nuclear Magnetic Resonance and Mass Spectrometry. Activity tests against... |
| Tipo: Text |
Palavras-chave: Spermine; Polylactates; Lactobacillus; Extraction; Purification; Ms; Nmr. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00616/72773/72221.pdf |
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| Maurel, Laurence; Bocande, Stephane; Duval, Magali; Gauthier, Emilie; Huguet, Antoine. |
| Ces fiches ont été rédigées pour accompagner la mise en service de l'outil "BD Récif" et constitue la notice d'utilisation simplifiée. BD Récif est une application destinée à faciliter la bancarisation des données relatives aux écosystèmes récifaux (suivis des aires marines protégées, suivis de la Directive Cadre sur l'eau, programmes de recherche, …). Cet outil a été financé par l'Etat / DEAL Réunion (inscrit dans le TIT Resobs de l'IFRECOR), le MNHN et IFREMER. Il a été mis en production en 2016 et livré avec des données historiques qui ont fait l'objet pour partie de reprises depuis l'outil CoReMo. Cet outil s'appuie sur le Système d'Information Quadrige² (constituant le système central, car désigné par le Ministère en charge de l'Environnement comme... |
| Tipo: Text |
Palavras-chave: BD Récif; Données; Métadonnées; Résultats; Saisie; Extraction; Administration; Base de données; Benthos de substrats durs; Récifs coralliens. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00386/49776/50321.pdf |
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| Ortega, A.; Borges, P.; Roncal, E.; Rogert, E.; Pino, J. A.. |
| Las mejores condiciones de extracción por percolación fueron empleando un tamaño de partícula promedio de 1,7 mm y una velocidad de extracción de 102 mL/h. El rendimiento del mejor extracto fue 79,2 % presentando 3,1 % de sólidos totales y una calificación del sabor a café de 5,1 que corresponde a una intensidad moderada. La variable acidez está determinada por la velocidad de extracción y en menor medida el tamaño de partícula; a medida que ambos factores disminuyen, la acidez se incrementa. En el contenido de sólidos totales se aprecia que al disminuir el tamaño de partícula, fue mayor el contenido de sólidos y el sabor a café está determinado fundamentalmente por el tamaño de partícula. A medida que este factor disminuyó, aumentó la intensidad del sabor... |
| Tipo: Journal Contribution |
Palavras-chave: Food processing; Size; Coffee pulp; Flavour; Extraction. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5016 |
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| Sedjo, Roger A.. |
| Unlike other resources such as petroleum, coal, and copper, forests are renewable. Yet, in many respects forests historically have been treated as a nonrenewable resource in that forest stocks were depleted or "mined" and loggers moved on to exploit other "deposits." The lands were often put to other uses, typically agricultural, or allowed to regenerate naturally. This paper looks at technical change in forest extraction, i.e., logging under a number of different conditions. It finds that, on average, labor productivity has been increasing in recent decades. However, total factor productivity in the US has declined in recent years. In addition, the study examines the tree-growing potential of plantation forestry. It finds that there is underway a... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Productivity; Resources; Forests; Timber; Technology; Innovations; Plantations; Logging; Genetics; Extraction; Resource /Energy Economics and Policy; O31; O32; O50; O51; Q23. |
| Ano: 1997 |
URL: http://purl.umn.edu/10667 |
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| Sartori, Marco Antonio; Perez, Ronaldo; da Silva Junior, Aziz Galvao; Machado, Silvia Regina Sartori; Santos, Manoela Maciel de Souza; Miranda, Carlos Alberto de Castro. |
| This study aimed at the technical-economical evaluation of implanting some vegetal-oil extraction units in order to insert the family agriculture into bio-diesel production chain. Three project models (arrangements) for vegetal-oil extraction units at different sizes were proposed, using extraction by pressing and mixed extraction (extracting by either pressing or solvent) and different raw materials (castor-oil and soybean). For the size analysis, the oil production scales between 50/60 tons/day were used with real market data concerning investments, inputs prices of the process, raw materials and vegetal oil. For the economic analyses, the software BioSoft was used. The BioSoft is a program for supporting the decision-making process, which was developed... |
| Tipo: Journal Article |
Palavras-chave: Vegetal oil; Extraction; Viability; Crop Production/Industries; L25; D81; L69.. |
| Ano: 2009 |
URL: http://purl.umn.edu/60807 |
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| Aquino,Rosiane Filomena Batista Almeida; Assunção,Natália Silva; Aquino,Leonardo Angelo; Aquino,Priscila Maria de; Oliveira,Guilherme Anthony de; Carvalho,André Mundstock Xavier de. |
| Farmers must carefully choose the cultivar to be grown for a successful carrot crop. The yield potential of the cultivar may influence nutrient demand and should be known to plan for fertilization application. The aim of this study was to evaluate the cultivar effect on carrot yield and on the nutrient content and quantities allocated to leaves and roots. Three experiments were set up in two crop seasons in Rio Paranaíba, MG, Brazil. In the first season, typical summer, 10 summer cultivars were sown. In the second season, summer-winter (transition), two experiments were set up, one with summer cultivars and the other with winter cultivars. The treatments consisted of the carrot cultivars distributed in randomized blocks with four replications. Fresh and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Daucus carota L.; Nutritional balance; Extraction; Nutrient export. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000200541 |
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| BAKO, TANKO; VICTOR, UMOGBAI I; J, AWULU O. |
| The effect of pre-treatment of mackery (Scomber scombrus) on oil recovery and quality was investigated. Fish oil was extracted using the screw expeller press after heat pre-treatment of the fish sample. The effect of cooking temperatures and cooking times was evaluated. It was observed that the oil yield has a positive relationship with cooking temperature. The oil yield increased with increasing cooking temperature at all the cooking times investigated and also increased with increasing cooking time from 5-15 minutes and then decreased for 20 minutes cooking time at all the cooking temperatures investigated. The results revealed that a highest yield of 22.8 % was obtained when the fish was treated at 90 0C cooking temperature for 15 minutes. The lowest... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Criteria; Fish Oil; Pre-treatment; Extraction; Oil yield. |
| Ano: 2017 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4021 |
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| BAKO, TANKO; ENYI, OBETTA SAMUEL; IMOLEMHE, UMOGBAI VICTOR. |
| A theory using mechanical expression was proposed from the physics of oil expression in a screw press to characterize a mathematical model. The general oil expression equation was solved for three machine parameters (choke clearances, screw shaft clearances and screw shaft speeds) which simulate the machine parameters effects in the overall screw expeller process. The mathematical model was validated by the experimental data obtained from pressing fish oil with a screw press, using regression analysis. The experimental oil extraction data was fitted to the model and the quality of fit evaluated. A good fit was indicated by correlation coefficient of 0.9983, coefficient of determination of 0.9967, absolute average percentage deviation of 4.8 %, coefficient... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mathematical; Model; Extraction; Parameters. |
| Ano: 2020 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5521 |
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| ADEKANYE, TIMOTHY ADESOYE; Adelakun, Joseph Oluwasegun. |
| A small-scale machine for extracting watermelon juice was developed with locally available materials and evaluated to determine its best extracting operating factors. The machine slices a whole watermelon and extracts its juice content. This machine operates on the principle of compressive and shearing force exerted through an auger. Component parts includes feeding hopper, conveyor shaft, auger conveyor housed in a cylindrical chamber, juice sieve, juice collector, seed - pulp outlet, gear and main frame. It was powered by a 1hp electric motor, coupled to a gear reduction speed to operate at 46.67 rm-1. In operation, watermelon fruits introduced via the hopper is squeezed and transferred to the auger conveyor. The auger presses and squeezes the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultural Engineering Watermelon; Juice; Extraction; Small scale; Evaluation. |
| Ano: 2018 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4109 |
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| BAKO, TANKO; UMOGBAI, VICTOR I.; OBETTA, SAMUEL E.. |
| An investigation was carried out on the effect of expeller press parameters such as choke clearances (1, 2 and 3 mm), screw clearances (1, 2 and 3 mm) and screw (worm) shaft speeds (50, 60 and 70 rpm) on fish oil extraction. The oil extraction rate and extraction efficiency had a negative relationship with choke clearances and screw clearances but had a positive relationship with screw (worm) shaft speeds. The oil extraction rate and extraction efficiency were found to decrease with increase in choke clearances and also decreased with increase in screw clearances. Increase in screw (worm) shaft speeds from 50 to 70 rpm was observed to increase oil extraction rate and extraction efficiency. The extraction loss had a positive relationship with choke... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish oil; Extraction; Expeller; Parameters; Optimize. |
| Ano: 2018 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4869 |
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| Registros recuperados: 52 | |
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