Dissertations / Theses on the topic 'S 405 UL 2007 B753'
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Boucher, Marie-Christine. "Impact des traitements physiques sur la stabilité des matrices d'encapsulation à base d'isolat de protéines de lactosérum et de pectine faiblement méthylée." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24290/24290.pdf.
Full textBouffard, Marie-Claude. "Excipients à base de protéines de maïs pour la libération contrôlée de principes actifs alimentaires." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24320/24320.pdf.
Full textGutiérrez, Alvarez Luis Felipe. "Extraction et caractéristiques des huiles de l'argousier (Hippophaë rhamnoides L.). Une étude des effets de la méthode de déshydratation des fruits sur le rendement d'extraction et la qualité des huiles." Master's thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/19648.
Full textSea buckthorn (Hippophaë rhamnoides L.) seeds and pulp oils have been recognized for their nutraceutical properties. The effects of air-drying and freeze-drying on extraction yields and quality of oils from sea buckthorn (cv. Indian-Summer) seeds and pulp were studied. Oil extractions were carried out using hexane. Air-dried (ADS) and freeze-dried (FDS) seeds, gave a similar extraction yields (∼12%w/w), whereas those of air-dried (ADP) and freeze-dried (FDP) pulps were significantly different (35.9±0.8 vs. 17.1±0.6%w/w). Fatty acid analysis revealed that α-linolenic (37.2-39.6%), linoleic (32.4-34.2%) and oleic (13.1%) acids were the main fatty acids in seed oils, while pulp oils were rich in palmitoleic (39.9%), palmitic (35.4%) and linoleic (10.6%) acids. Lipid fractionation of crude oils, obtained by solid phase extraction, yielded mainly neutral lipids (93.9-95.8%). The peroxide values of seed and pulp oils were circa 1.8 and between 3.0-5.4 meq/kg respectively. The melting behavior of oils was characterized by differential scanning calorimetry.
Mendez, Lagunas Lilia. "L'effet des conditions variables de séchage sur la cinétique de séchage et la qualité de l'ail." Doctoral thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/19090.
Full textBouchard, Sébastien. "Effets du poids d'abattage, de la vitesse de croissance et des sexes sur les caractéristiques musculaires et les relations avec la qualité de la viande." Thesis, Université Laval, 2008. http://www.theses.ulaval.ca/2008/25598/25598.pdf.
Full textBouazza, Aya. "Purification, caractérisation et étude des propriétés immunostimulantes de l'hémocyanine de crabe des neiges, Chinoecetes opilio." Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26758/26758.pdf.
Full textGoulet, Marie-Claire. "Évolution adaptative des cystatines végétales et modulation de leur activité inhibitrice par mutagenèse dirigée." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24509/24509.pdf.
Full textGagnon, Josée. "Consommation de lait et syndrome métabolique chez la femme ménopausée." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24248/24248.pdf.
Full textLeung, Sok Line Valérie. "Caractérisation d'émulsions gélifiées à froid de [béta]-lactoglobuline destinées à la protection de molécules nutraceutiques." Master's thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/18760.
Full textMcGraw, Serge. "Études de facteurs impliqués dans le remodelage de la chromatine chez les gamètes et les embryons bovins." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24894/24894.pdf.
Full textPedneault, Karine. "Étude de composés extractibles chez les champignons indigènes du Québec." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/25013/25013.pdf.
Full textDieuconserve, Joseph. "Optimisation de la régie de culture de Phalaenopsis spp. au Québec." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24579/24579.pdf.
Full textSavard, Patricia. "L'expression des gènes responsables du catabolisme de l'arabinoxylane chez Bifidobacterium longum." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24549/24549.pdf.
Full textBellemare, Mireille. "Productivité de la chicouté au Québec en fonction de diverses régies de culture." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24245/24245.pdf.
Full textBelzile, Martin. "Bilan de masse de différents systèmes de séparation des fractions solide et liquide des déjections porcines directement sous les lattes." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24942/24942.pdf.
Full textMoroni, Olivier. "Contribution à l'étude du rôle des probiotiques dans le contrôle et la prévention des infections entériques à Listeria monocytogenes : analyse in vitro et étude in vivo des mécanismes d'action antimicrobien." Doctoral thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/18622.
Full textDesroches, Sophie. "Approches nutritionnelles pour le traitement du syndrome métabolique et de ses complications." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24782/24782.pdf.
Full textSchreyer, Arnaud. "Régulation électrochimique du potentiel d'oxydoréduction du lait : impact des composantes du lait et effet sur sa résistance à l'oxydation après traitement." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24539/24539.pdf.
Full textJacquot, Arnaud. "Étude de l'activité immunomodulante de peptides issus de protéines du lactoserum bovin." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/25030/25030.pdf.
Full textAider, Mohammed. "Étude de la mobilité électrophorétique des oligomères de chitosane et leur fractionnement par électrodialyse avec membrane d'ultrafiltration (EDUF)." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24741/24741.pdf.
Full textThe aim of this project was to study the electrophoretic mobility of chitosan oligomers and to apply the results to separate them in an electrodialysis with ultrafiltration membrane (EDUF) system. The first sub-objective was to study the electrophoretic mobilities of D-glucosamine and chitosan oligomers (dimer, trimer, tetramer, pentamer and hexamer) under various conditions of pH, salts and added ionic strengths. pH values from 3 to 9 and ionic strength of 0.01, 0.05 and 0.1 M of NaCl and KCl were studied. The same measurements were carried out in deionised water as a medium without any added ionic strength. Chitosan oligomer electrophoretic mobility decreased by increasing pH and ionic strength. The highest values were recorded in water followed by those in NaCl or KCl with an ionic strength of 0.01 M. The lowest values were recorded at an ionic strength of 0.05 and 0.1 M. The dimer was the most mobile oligomer followed by the monomer. No difference was observed between the mobilities of the oligomers with degree of polymerisation (DP) of 3 and more. The second sub-objective consisted to study the electrophoretic mobility of chitosan oligomer mixture composed by dimers, trimers and tetramers at different concentrations. pH values from 2 up to 12, added ionic strength of 0.01, 0.05 and 0.1 M of NaCl were studied. Electrophoretic mobility was also carried out in water as medium with zero added ionic strength. At a concentration of 3%, the chitosan oligomer mixture showed the highest electrophoretic mobility at pH 2 and 3 with an average value of 2.009 ± 0.105 x 10-6 m2/V.s. At pH 4, 5 and 6, the electrophoretic mobility was stable with an average value of 1.225 ± 0.051 x 10-6 m2/V.s. By increasing the pH, electrophoretic mobility decreased because of the deprotonation phenomenon of the amine group. By decreasing the concentration, the electrophoretic mobility decreased. Following these fundamental studies, the separation by an electrodialysis with ultrafiltration membrane (EDUF) system of a chitosan oligomer mixture was studied. The third sub-objective was to study the effect of ultrafiltration membrane molecular weight cut-offs on chitosan oligomers electromigration rates and kinetics. Five cellulose ester ultrafiltration membranes of 500, 1000, 5000, 10000 and 20000 Da MWCO were used. The membrane molecular weight cut-off had a significant effect on the electromigration rate of each chitosan oligomer, as well as on the possibility of their separation. The dimer showed the highest electromigration rates with average values which varied from 5.71 ± 0.95% up to 14.45 ± 1.43% with 1000 and 20000 Da MWCO UF-membranes, respectively. The effect of the processing time and the oligomers chain length was interpreted. Following this objective, an UF-membrane of 10000 Da MWCO was selected for the future objectives. The fourth sub-objective was to study the effect of the pH on the electromigration rate of the studied oligomers and their kinetics. pH 4 and solution flow velocity of 0.5 cm/s (300 mL/min) were used. pH had a significant effect on the electromigration rate of the oligomers and the possibility of their separation. After 4h of treatment, the dimer showed the highest electromigration rates with mean values of 11.50 ± 4.33, 10.61 ± 0.21, 8.30 ± 0.34 and 5.52 ± 0.38% at pH values of 4, 5, 6 and 7, respectively. Trimer electromigration rates were lower than that of the dimer. Between pH 4 and 7, it migrated with mean values of 8.52 ± 1.45 and 0.83 ± 0.43%, respectively. The effect of the processing time, electrophoretic mobility and oligomers chain length were interpreted. It was possible to obtain a fraction composed by the dimer and trimer at pH 4 and 5 until 2 and 3h, respectively. At pH 6, the tetramer did not migrate during the 4h of treatment. At pH 7, it was possible to obtain dimer pure fraction until 2h of treatment. No electromigration was observed at pH 8 and 9. In the fifth sub-objective, the effect of the applied external electric field (2.5, 5 and 10 V/cm, corresponding to an applied volatage of 5, 10 and 20 V, respectively) to the electrodialysis with ultrafiltration membrane (EDUF) system and solution flow velocity (2.77, 8.33 and 13.88 cm/s corresponding to flow rates of 100, 300 and 500 mL/min, respectively) on the electromigration rate and kinetics of the oligomers were studied. The solution flow velocity did not show any effect on the electromigration rate of the oligomers whereas the applied electric field strength had a significant effect on both electromigration rate and separation of the studied oligomers. At 2.5 V/cm, it was possible to obtain a solution composed only by the dimer and trimer until 2 h of treatment. Using and electric field strength of 2.5 V/cm, the dimer migrated with an average rate of 10.20 ± 3.04% and the trimer with an average value of 8.52 ± 1.66%. By increasing the electric field strength up to 5 and 10 V/cm (voltage of 10 and 20 V, respectively), there was no separation of the studied chitosan oligomers.
Cambouris, Nancy Athyna. "Impact des zones d'aménagement des sols délimitées à l'aide de la conductivité électrique sur la gestion de l'azote dans la culture de la pomme de terre." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24912/24912.pdf.
Full textNaghmouchi, Karim. "Divergicine M35, une nouvelle bactériocine produite par Carnobacterium divergens M35 : caractérisation moléculaire du mécanisme d'action anti-microbien et du phénomène de résistance." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24296/24296.pdf.
Full textGentès, Marie-Claude. "Utilisation de complexes formés de pectine et d'isolat de protéines sériques dans la formulation de yogourts brassés." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/25036/25036.pdf.
Full textThe aim of this work was to improve the rheological properties and whey retention of stirred yoghurts by the addition of whey protein isolate (WPI) and low methoxyl pectin complexes as stabilizing agent. The developed complexes were stabilized to a pH adjustment to 7.0 by the application of heat treatment. The level of incorporation to obtain adequate finish characteristics was determined. The stabilized complexes (heat treated) were unable to enhance the rheological properties of yoghurt despite of unheated complexes did. This effect could be due to the addition of WPI and pectin without complexe formation. Using a WPI and pectin solution without complexe formation led to increase the rheological properties. Varying the casein to total protein ratios gave different results: unheated complexes permitted to obtain greater rheological properties than WPI and pectin solution without complexe formation.
Tahiri, Imane. "Isolement, caractérisation et étude du potentiel de la divergicine M35, pour la bio-conservation des produits marins prêts à consommer." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24809/24809.pdf.
Full textThéroux, Rancourt Guillaume. "Influence de l'hydrologie, du substratum et de la restauration d'une tourbière abandonnée sur la croissance de la chicouté." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24595/24595.pdf.
Full textCloudberry (Rubus chamaemorus L.) cultivation is presently receiving more and more attention. A grower’s guide is available in Norway. However, site selection is imprecise with regards to soil physical and hydrological properties. Furthermore, compatibility of peatland restoration techniques with cloudberry cultivation has not been tested, as well as the establishment of Norwegian cultivars in Canada. Water table levels did not affect cloudberry growth, although physical properties were different between the two experimental conditions. However, more rhizomes were produced in fibric peat than in mesic peat. Mulching decreased the production of leaves. The Norwegian cultivar Fjordgull had the highest survival. These results suggest that cloudberry should be planted 2 or 3 years after peatland restoration, as well as in fibric peat that has received a limited amount of machinery work, thus having better porosity and physical properties.
Lin, Teng Shee Fabrice. "Optimisation et rationalisation de la transformation du chitosane en oligomères par électrodialyse avec membranes bipolaires." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24826/24826.pdf.
Full textGoulet, Julie. "Le mode alimentaire méditerranéen chez des femmes québécoises en santé : applicabilité et effets sur la santé." Doctoral thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/19176.
Full textParadis, Marie-Ève. "Étude du rôle de la lipase endothéliale dans le métabolisme des lipoprotéines chez l'humain." Doctoral thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/19461.
Full textClark, Karen. "Transformations de l'azote dans deux sols froids après l'application d'un lisier de porc enrichi en ¹⁵N." Master's thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/19296.
Full textNaserkhaki, Mostafa. "Effet de la succion matricielle des sols non saturés sur leur compressibilité." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24160/24160.pdf.
Full textThibault, Catherine. "Le désherbage sélectif de l'amarante à racine rouge dans la culture du concombre de transformation au Québec." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24988/24988.pdf.
Full textLauzière, Julie. "Maintien de l'allaitement après le retour au travail : une exploration de ses déterminants." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24847/24847.pdf.
Full textCôté, Isabelle. "Étude de l'impact des conditions de culture in vitro sur l'expression génétique embryonnaire chez le bovin." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24920/24920.pdf.
Full textChampagne, Annie. "Potentiel antagoniste des bactéries lactiques épiphytes de plantes fourragères contre le développement des clostridies dans l'ensilage." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24347/24347.pdf.
Full textPouliot, Éric. "Impact de l'environnement d'élevage durant la période hivernale sur les performances de croissance et la qualité de la viande des agneaux lourds." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24667/24667.pdf.
Full textPoirier, Vincent. "Séquestration du carbone dans un sol agricole du Québec : influence du travail du sol et de la fertilisation des cultures." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24793/24793.pdf.
Full textLavoie, Frédéric. "Conception d'une récolteuse de saules en rotation courte." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24410/24410.pdf.
Full textRichard, Geneviève. "Développement d'un biofongicide à base d'ail et de chitosane pour lutter contre le blanc de la tomate de serre." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24686/24686.pdf.
Full textJalbert, Marie-Eve. "Habitudes de vie et composition corporelle de jeunes Québécois d'âge scolaire." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24280/24280.pdf.
Full textCorrea, Jorge Andrés. "Évaluation des impacts de la vitesse de croissance et du poids d'abattage des porcs commerciaux sur la composition de la carcasse et la qualité de la viande." Master's thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/19298.
Full textBenchabane, Meriem. "Modifications post-traductionnelles d'une serpine humaine recombinante exprimée chez les plantes." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24868/24868.pdf.
Full textMaltais, Anne-Marie. "Conditionnement nutritionnel en serre des transplants de laitues Boston et Iceberg (Lactuca sativa L.) cultivés en mottes cubiques." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24675/24675.pdf.
Full textSt-Arnaud, Claudia. "Dynamique de la végétation d'un fen pauvre face à une simulation de réchauffement climatique : réponses potentielles des tourbières boréales à sphaignes." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24414/24414.pdf.
Full textMorency, Sandra. "Une exploration du continuum sécurité-insécurité alimentaire de ménages à faible revenu de la Ville de Québec et des facteurs qui y sont associés." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24710/24710.pdf.
Full textLechasseur, Guillaume. "Étude et optimisation de la coupe des tiges de saule." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24324/24324.pdf.
Full textGagnon, Mélanie. "Rôle des probiotiques lors d'infections entériques d'origine bactérienne et virale : analyses in vitro et études in vivo chez des modèles murins." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24866/24866.pdf.
Full textFor decades, the use of certain lactic acid bacteria as so-called probiotics has been suggested in order to stabilize the intestinal microbiota and thus prevent or treat enteric infections. Consumption of these bacteria, which are normal components of human intestinal microbiota, is reputed to be beneficial to health. However, their possible role as therapeutic or prophylactic agents has been studied very little. Five probiotic bifidobacteria isolated from the feces of newborn infants were first selected and characterized. Among these, a strain of Bifidobacterium thermacidophilum (called RBL71) demonstrating strong resistance to the conditions prevailing in the digestive tract, strong adhesion to Caco-2 intestinal cells and inhibition of the adhesion of Escherichia coli O157:H7 (50%) to Caco-2 cells was administered via the oral route to BALB/c mice. Mice thus treated before challenge had reduced fecal counts of E. coli O157:H7 and less intestinal histological damage than the control group. Greater production of O157:H7-specific antibody was detected in mice receiving the probiotic. In a second study, the effectiveness of three other strains of bifidobacteria against viral enteropathogens was examined. A strain of B. thermophilum (called RBL67) demonstrating the strongest inhibition (98%) of rotavirus attachment to Caco-2 and HT-29 intestinal cells was administered via the oral route to neonatal CD-1 mice infected with rotavirus. The viral concentration of the intestinal contents 48 hours after infection was significantly lower in the probiotic-treated group than in the control group. In addition, the diarrhea was of shorter duration and rotavirus-specific antibody production was detected in the mice receiving the probiotic before infection. These results suggest that strain RBL67 has a positive impact on the evolution of infections by invasive viral pathogens such as rotavirus and that strain RBL71 could thus have a role to play in the prevention or treatment of enteric infections by non-invasive bacterial pathogens such as E. coli O157:H7. In both cases, inhibition of adhesion of the pathogen seems to be a plausible mechanism of action. This demonstration of the activities of these new bifidobacterial strains of human origin against E. coli O157:H7 and rotavirus suggests their potential for interfering with the mechanism of infection of enteropathogens and supports their use in humans as possible agents for preventing enteric infections transmitted by the oral route.
Neveu, Bertrand. "Nouveaux outils moléculaires pour l'étude des propriétés de Pseudozyma flocculosa." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24542/24542.pdf.
Full textOuédraogo, Bernadette. "L'acceptation et l'attitude des jeunes consommateurs envers les aliments fonctionnels." Master's thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/19569.
Full textFortier, Elisabeth. "Utilisation d'indicateurs des besoins en azote pour atténuer les pertes en nitrate associées à l'irrigation et à la fertilisation du brocoli." Master's thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/19572.
Full textCaisse, Gabriel. "Importance de la fertilisation lors du boisement des tourbières résiduelles." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24833/24833.pdf.
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