Dissertations / Theses on the topic 'Food sciences, n.e.c'
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Qian, Xin. "Cobalt-Catalyzed C-C and C-N Coupling reactions." Phd thesis, Ecole Polytechnique X, 2013. http://pastel.archives-ouvertes.fr/pastel-00943479.
Full textEriksson, Anders. "Cathodic Arc Synthesis of Ti-Si-C-N Thin Films from Ternary Cathodes." Licentiate thesis, Linköpings universitet, Tunnfilmsfysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-61994.
Full textSnell, Robert Henry. "Development and application of asymmetric C-N bond formation." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:512e617a-2b01-45f3-86ae-c0cf4b874149.
Full textNordin, Emma, and Johnsson Emma Erlandsson. "Comparison of P, N and C in catchments sediments around Lake Victoria." Thesis, Linköpings universitet, Tema Miljöförändring, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-142742.
Full textHronskiy, Oleksiy. "Grazing Legacy Influence Nutrient Content and Dry Matter Digestibility of Five Reindeer Food Plants." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-174776.
Full textVabre, Roxane. "Fonctionnalisation directe de liaisons C-H et couplages croisés pour la formation de liaisons C-C et C-N : synthèse de purines 6,8,9-trisubstituées." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00923198.
Full textMcGowan, Andrew R. "Biofuel cropping system impacts on soil C, microbial communities and N₂O emissions." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/20510.
Full textAgronomy
Charles W. Rice
Substitution of cellulosic biofuel in place of gasoline or diesel could reduce greenhouse gas (GHG) emissions from transportation. However, emissions of nitrous oxide (N₂O) and changes in soil organic carbon (SOC) could have a large impact on the GHG balance of cellulosic biofuel, thus there is a need to quantify these responses in cellulosic biofuel crops. The objectives of this study were to: (i) measure changes in yield, SOC and microbial communities in potential cellulosic biofuel cropping systems (ii) measure and characterize the temporal variation in N₂O emissions from these systems (iii) characterize the yield and N₂O response of switchgrass to N fertilizer and to estimate the costs of production. Sweet sorghum, photoperiod-sensitive sorghum, and miscanthus yielded the highest aboveground biomass (20-32 Mg ha⁻¹). The perennial grasses sequestered SOC over 4 yrs, while SOC stocks did not change in the annual crops. Root stocks were 4-8 times higher in the perennial crops, suggesting greater belowground C inputs. Arbuscular mycorrhizal fungi (AMF) abundance and aggregate mean weight diameter were higher in the perennials. No consistent significant differences were found in N₂O emissions between crops, though miscanthus tended to have the lowest emissions. Most N₂O was emitted during large events of short duration (1-3 days) that occurred after high rainfall events with high soil NO₃₋. There was a weak relationship between IPCC Tier 1 N₂O estimates and measured emissions, and the IPCC method tended to underestimate emissions. The response of N₂O to N rate was nonlinear in 2 of 3 years. Fertilizer induced emission factor (EF) increased from 0.7% at 50 kg N ha⁻¹ to 2.6% at 150 kg N ha⁻¹. Switchgrass yields increased with N inputs up to 100-150 kg N ha⁻¹, but the critical N level for maximum yields decreased each year, suggesting N was being applied in excess at higher N rates. Yield-scaled costs of production were minimized at 100 kg N ha-1 ($70.91 Mg⁻¹). Together, these results show that crop selection and fertilizer management can have large impacts on the productivity and soil GHG emissions biofuel cropping systems.
Piccin, Jeferson Steffanello. "Produção de quitosana a partir de resíduo de camarão e aplicação como adsorvente do corante alimentício FD&C vermelho n° 40." reponame:Repositório Institucional da FURG, 2009. http://repositorio.furg.br/handle/1/2569.
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Uma preocupação das indústrias de alimentos atualmente, diz respeito à geração de resíduos provenientes do processamento das matérias-primas. Estudos têm sido realizados no sentido de encontrar um destino adequado para os resíduos gerados pelas indústrias, de modo que as agressões ao meio ambiente sejam cada vez mais reduzidas. Neste contexto, a utilização de quitina, substância encontrada nos exoesqueletos de insetos, carapaças de crustáceos e parede celular de fungos, para a produção de quitosana vem sendo estudada há vários anos. O objetivo do presente trabalho consistiu no estudo do processo de obtenção da quitosana a partir de resíduos de camarão e sua aplicação como adsorvente do corante alimentício FD&C Vermelho n° 40, através da construção das isotermas de equilíbrio, cinética de adsorção, determinação dos parâmetros termodinâmicos, verificação da natureza e dos mecanismos do processo de adsorção. As análises de erro demonstraram que o modelo de isoterma de Langmuir foi mais apropriado para descrever os dados experimentais, sendo que a máxima adsorção na monocamada observada quando o pH de equilíbrio foi de 6,6, temperatura 35°C, tamanho de partícula de 0,10±0,02 mm, e grau de desacetilação 84±3% foi de 529 mg g-1. Valores negativos da entalpia (-112,7 kJ mol-1), entropia (-0,338 kJ mol-1 K-1) e Energia livre de Gibbs (-15,6 a 1,0 kJ mol-1) demonstraram que o processo de adsorção é exotérmico, espontâneo, favorável, e que a desordem do sistema diminui durante o processo de adsorção. O modelo cinético de Elovich e modelo de pseudo-segunda ordem foram os mais adequados para descrever as cinéticas de adsorção, sendo que a difusão no interior da partícula, na maioria dos casos, é o mecanismo que controla o processo de adsorção. Em condições ácidas (pH = 5,7) mais de 90% da capacidade de adsorção foi atingida em menos de 20 min. Nestas condições foi observado que a natureza do processo de adsorção é química, devido às interações entre os grupamentos aminas protonados da quitosana e o grupo sulfonado do corante. Estes resultados demonstraram que a quitosana é um promissor adsorvente de corantes alimentícios, em especial o corante alimentício FD&C Vermelho n° 40.
A current foods industries concern says respect at wastes generation of the raw materials processing. Studies are being accomplished in the sense of finding an appropriate destiny for the industrial wastes, for the environments aggressions reduction. Therefore, the use of chitin, substance found in the exoskeletons of insects, shells of crustaceans, and fungal cell walls, for chitosan production has been studied at various years. The aim of the present work was the study of production process of chitosan from shrimp wastes and your application in the adsorption of food dye FD&C Red n° 40, through the techniques of equilibrium isotherm and adsorption kinetic, determination of the thermodynamic parameters, verification of the nature and mechanisms of the adsorption process. Error analysis demonstrated that the Langmuir isotherm model was most appropriate for describing the experimental data, and the maximum monolayer adsorption value has been found to be 529 mg g-1, at pH 6.6, temperature 35°C, particle size range 0.10±0.02 mm, and deacetylation degree 84±3%. Negative enthalpy (-112.7 kJ mol-1), entropy (-0.338 kJ mol-1 K-1) and Gibbs free energy (-15.6 to 1.0 kJ mol-1) values demonstrated that the adsorption process is exothermic, spontaneous, favorable, and that randomness of the system decreases during the adsorption process. The Elovich and pseudo-second order kinetics models were most appropriate to describe the adsorption kinetics, and the intraparticle diffusion, in most of the cases, was adsorption mechanism that control the process. In acid conditions (pH = 5.7) more than 90% of the adsorption capacity were reached in less than 20 min. In these conditions was observed that the chemical adsorption process nature, due the interactions between the chitosan protonated amino group and the dye sulphonic group. These results demonstrated that the chitosan is a promising adsorbent of food dyes, especially the food dye FD&C Red n° 40.
Fahlgren, Viktoria. "Utveckling av en C-vitaminberikad tofuprodukt : Studie av C-vitaminhalt under process och förvaring." Thesis, Linnéuniversitetet, Institutionen för kemi och biomedicin (KOB), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-67747.
Full textBailey, Jennifer Meghan. "Western Spruce Budworm Effects on Throughfall C, N, and P Fluxes in a Central Washington Forest." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc955099/.
Full textMcLagan, Toni Lisa. "Re[growth] : a development of social capital through food network accessibility." Diss., University of Pretoria, 2016. http://hdl.handle.net/2263/60188.
Full textDie verhandeling is gerig op die toenemende globale kwessie van ons land se voedselonsekerheid en die faktore wat daartoe bydra. Dit ondersoek die rol wat argitektuur kan speel as 'n sistemiese instrument (in die vorm van 'n gastronomiese kwartaal) vir die her[groei] van 'n hoogs omstrede kwessie. Deur die identifisering van globale en plaaslike omstandighede word voedselsekerheid bemagtiging ontwikkel deur die integrasie van sosio-ekonomiese stelsels wat optree as punte van akupunktuur om kontekstuele omstandighede te verbeter. Deur 'n nuut gevormde argitektoniese benadering waardeur kos en die toeganklikheid daarvan die basis vorm van sosiale inklusiwiteit, word verskeie mense in die samelewing bemagtig deur van plaaslike ondersteuning gebruik te maak. Plaaslike ondersteuning is van kardinale belang vir die groei en bemagtiging van 'n gemeenskap, wat 'n positiewe impak op die algehele stedelike moraliteit of weefsel het deur die voorsiening van 'n meer inklusiewe omgewing vir die bemagtiging van daardie V. gemeenskap.
Mini Dissertation (MArch (Prof))--University of Pretoria, 2016.
Architecture
MArch (Prof)
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Tolley, Rebecca. "Review of Sweet Treats Around the World: An Encyclopedia of Food and Culture." Digital Commons @ East Tennessee State University, 2015. https://dc.etsu.edu/etsu-works/5621.
Full textZiyadeh, Azza. "Nouveaux mécanismes contribuant à la variabilité phénotypique de mutations N- et C-terminales du canal sodique cardiaque." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2014. http://tel.archives-ouvertes.fr/tel-01037923.
Full textMattesini, Maurizio. "Proposition et modélisation ab initio de nouveaux matériaux ultra-durs dans le ternaire B C N." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2001. http://tel.archives-ouvertes.fr/tel-00003143.
Full textBelkouch, Said. "Etude électronique et physicochimique de la structure Pt/a-Si:H/c-Si(n)." Grenoble 1, 1989. http://www.theses.fr/1989GRE10086.
Full textPlaton, Mélanie. "Propriétés et performances de phosphines ferrocéniques dans le couplage C-O, C-S et C-N : nouvelles méthodologies de synthèse au palladium." Phd thesis, Université de Bourgogne, 2012. http://tel.archives-ouvertes.fr/tel-00818998.
Full textAziz, Robeena M. "Utilization of a preclinical model for chemoprevention of esophageal cancer employing a food-based and single- agent approach." Columbus, Ohio : Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1086122566.
Full textTitle from first page of PDF file. Document formatted into pages; contains xvi, 154 p.; also includes graphics (some col.). Includes abstract and vita. Advisor: Gary D. Stoner, School of Public Health. Includes bibliographical references (p. 143-154).
Bunn, Janice Yanushka. "Reliability of a food-frequency questionnaire used to estimate dietary exposure to n-nitroso and related compounds in a case-control study of childhood brain tumors /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487779914824219.
Full textRahil, Issam. "Elaboration et caractérisation de revêtements à base de nitrure de chrome, carbonitrure et carbure de titane élaborés par pulvérisation magnétron." Phd thesis, Ecole nationale supérieure d'arts et métiers - ENSAM, 2013. http://pastel.archives-ouvertes.fr/pastel-00967251.
Full textGicquel, Aurélien. "Impact des changements globaux sur le fonctionnement des tourbières : couplage C-N-S et interactions biotiques." Phd thesis, Université Rennes 1, 2012. http://tel.archives-ouvertes.fr/tel-00734604.
Full textEim, Iznardo Valeria Soledad. "Optimizaci��n del proceso de secado en base a criterios de calidad. Aplicaci��n al dise��o de un alimento c��rnico enriquecido en fibra alimentaria." Doctoral thesis, Universitat de les Illes Balears, 2012. http://hdl.handle.net/10803/84133.
Full textTo design dry fermented sausages enriched in dietary fibre, it is essential to obtain high quality functional ingredients, which can be incorporated into sausage formulation with minor modifications of the physico-chemical and sensory properties of food. The main objective of this study was to optimize the formulation of a dry fermented sausage enriched with a dietary fibre concentrate from carrot. The optimal formulation should provide maximum dietary fibre content and produce minimal quality changes from the traditional product. A methodology has been proposed to optimize both the acquisition of a high quality fibre concentrate and also for the formulation of a dry fermented sausage (sobrassada) enriched in dietary fibre. First, a procedure comprised of mathematical modelling, simulation and optimization of the convective carrot drying process was developed. The optimization procedure was not only concerned with mass transfer but also included criteria related to quality attributes of the final product. Once the high quality functional ingredient was obtained, it was incorporated into the sobrassada formulation. The optimal amount of carrot dietary fibre concentrate necessary to obtain a high quality enriched sausage was estimated by analysing the effects of carrot dietary fibre addition to the ripening-drying process of sobrassada.
En el disseny d'embotits crus curats enriquits en fibra aliment��ria, ��s essencial l'obtenci�� d'ingredients funcionals d'elevada qualitat que puguin ser incorporats en la formulaci�� de l'embotit generant les menors modificacions de les caracter��stiques fisicoqu��miques i sensorials de l'aliment. El principal objectiu d'aquest treball va consistir a optimitzar la formulaci�� d'un embotit cru curat enriquit en un concentrat de fibra aliment��ria de pastanaga. La formulaci�� ��ptima ha de proporcionar el contingut m��xim de fibra aliment��ria i produir la menor quantitat possible de canvis qualitatius respecte al producte tradicional. S'ha proposat una metodologia per optimitzar ambd��s aspectes esmentats, l'obtenci�� d'un concentrat de fibra aliment��ria d'alta qualitat i tamb�� la formulaci�� d'un embotit cru curat (sobrassada) enriquit en fibra aliment��ria. En primer lloc, s'ha desenvolupat un procediment que consisteix en la modelitzaci��, simulaci�� i optimitzaci�� del proc��s d'assecatge convectiu de pastanaga. El procediment d'optimitzaci�� no nom��s fa refer��ncia a la transfer��ncia de mat��ria, sin�� que tamb�� inclou els criteris relacionats amb els atributs de qualitat del producte final. Una vegada obtingut l'ingredient funcional de qualitat, va ser incorporat en la formulaci�� de la sobrassada. La quantitat ��ptima de concentrat de fibra aliment��ria de pastanaga necess��ria per obtenir un embotit enriquit de qualitat es va estimar mitjan��ant l'an��lisi dels efectes de l'addici�� de fibra aliment��ria de pastanaga en el proc��s de maduraci��/assecat de sobrassada.
Campos, Sergio Gaspar de. "Monitoramento de aflatoxinas, fungos toxig?nicos e n?veis de contamina??o em mat?rias primas e alimentos balanceados. Aflatoxicose natural em c?es no estado do Rio de Janeiro." Universidade Federal Rural do Rio de Janeiro, 2007. https://tede.ufrrj.br/jspui/handle/tede/809.
Full textThe commercial feed constitutes an important element in the pet industry in Brazil. Its composition includes cereal mixtures produced in farms such as sorghum, maize and some oily seeds. All feed destined to pets are supplemented with fats, vitamins, minerals, antirust and flours of diverse origins incorporated in some cases as pellets. When conditions of nutrients and moisture are adequate, fungal contamination could be present during pre and post harvest, storage, manufacture and processing of these ingredients. The filamentous stored grain fungi more commonly found include the species belonging to Aspergillus, Penicillium and Fusarium genera. They are able to produce different mycotoxins. Species of Aspergillus such as Aspergillus flavus, Aspergillus parasiticus and Aspergillus nomius are able to produce aflatoxins, considered as carcinogen type 1A. The pet foods have important amounts of cereals and therefore, they can concentrate important amounts of toxins. In dogs and cats the effects of mycotoxins are severe and can produce death, besides the loss of nutrients, to alter the organoleptic properties and to diminish the average life of the product in the market. On the other hand, the presence of toxicogenic species could indicate the contamination with several mycotoxins and this situation represents a potential risk for the animal health. On the basis of these antecedents the objectives of this work were 1) to characterize the mycoflora, 2) to detect the natural incidence of mycotoxins from raw materials and compound feed for dogs and 3) to establish parameters to prevent and/or to control micotoxicoses. A total of 230 samples (117 suspected foods to produce natural poisoning (AIN), 43 commercial foods (AC) of 3 different qualities, 70 ingredients of the production line (ALP)) of ingredients and rations destined to the feeding of dogs were analyzed. The fungal isolation was made by the surface spread method. The culture media were dicloran-rose-bengal-chloranphenicol agar (DRBC), dicloran-chloranphenicol 18% glicerol agar (DG18) and Nash-Snyder agar. The average of the number of colonies by triplicate was determined and it was expressed as colony forming units/gram of feed (UFC/g). AIN and some ALP (maize, ground maize, flour of sorghum, maize flour and gluten) obtained fungal counts over than 104 UFC/g. The AC samples were not over this value. Each strain was isolated and identified at the species level. The species belonging to the Aspergillus genera were predominant in all of the analyzed samples, having aflatoxicogenic species A. flavus/A. parasiticus those of greater frequency. These strains were evaluated in their ability to produce aflatoxins by the TLC method. The 100% of isolated strains of AIN, 80% of AC and 70% of ALP were able to produce aflatoxins at levels that varied from 2 and 66.25 ng/g. The natural incidence of aflatoxins in all feed samples was determined by high performance liquid chromatography (HPLC). AIN and some samples of ALP ingredients, mainly those containing maize, obtained aflatoxins levels over than 20 ppb. The hystopatological and biochemical studies of the affected animals organs demonstrated the death cause (aflatoxicosis), and were confirmed by the mycological studies: the fungal counts and aflatoxins levels were over the allowed ones by national and international regulations in use. The commercial feed of different qualities are feeds in conditions to be consumed, but have a potential risk if they are in inadequate storage conditions due to the aflatoxicogenic ability of the studied strains. As far as the ingredients and finished feed of the production line, those made up of maize did not fulfill the values of fungi and aflatoxins allowed by the legislation. Although the finished ration adjusts to the required regulation, probably by the processing, it presents a potential risk since more of 80% of the species of A. flavus, were able to produce aflatoxins B1 and B2. It is important then to emphasize the need to a suitable control of the used ingredients in the compound feed elaboration and the adequate environmental conditions to preserve the pet food of undesired fungal contamination and the consequent production of their mycotoxinas.
Os alimentos balanceados comerciais constituem um elemento importante na ind?stria de c?es no Brasil. Sua composi??o inclui misturas de cereais produzidos nas granjas, tais como sorgo, milho e algumas oleaginosas. Todos os alimentos destinados a c?es est?o suplementados com gorduras, vitaminas, minerais, antioxidantes e farinhas de diversas origens incorporados, em alguns casos como pellets. Ao possuir suficientes nutrientes e condi??es de umidade adequadas s?o suscet?veis a contamina??o por fungos durante a pr? e p?s-colheita, no armazenamento, na manufatura e no processamento destes ingredientes. Os fungos filamentosos mais comumente encontrados em gr?os armazenados incluem as esp?cies dos g?neros Aspergillus, Penicillium e Fusarium, capazes de produzir deteriora e diferentes micotoxinas. Esp?cies de Aspergillus como Aspergillus flavus, Aspergillus parasiticus e Aspergillus nomius s?o as mais toxic?genas podendo produzir aflatoxinas, consideradas como carcin?genos tipo 1A. Os alimentos destinados a c?es possuem quantidades importantes de cereais e, portanto podem concentrar quantidades importantes de toxinas. Em c?es e gatos os efeitos das micotoxinas s?o severos e podem produzir a morte, al?m de levar a perda de nutrientes, alterar as propriedades organol?pticas e diminuir a vida m?dia do produto no mercado. Por outro lado a presen?a de esp?cies toxicog?nicas poderia indicar a contamina??o com v?rias micotoxinas e, esta situa??o representa um risco potencial para a sa?de dos animais. Baseado no exposto anteriormente, os objetivos deste trabalho foram caracterizar morfologicamente a micobiota, detectar a incid?ncia natural de micotoxinas em ingredientes e alimentos balanceados para c?es, isolar microrganismos com potencialidades toxicog?nicas e estabelecer par?metros para prevenir e/ou controlar as micotoxicoses em c?es. Um total de 230 amostras (117 alimentos suspeitos de produzir intoxica??o natural (AIN), 43 de alimentos comerciais (AC) de tr?s qualidades diferentes, 70 ingredientes da linha de produ??o (ALP) de ingredientes e ra??es destinadas ? alimenta??o de c?es) foram analisadas. O isolamento de fungos se realizou pelo m?todo de dissemina??o em superf?cie. Os meios de cultivo utilizados foram ?gar Diclor?n-Rosa de Bengala Cloramfenicol (DRBC), ?gar Diclor?n Cloramfenicol 18% Glicerol (DG18) e ?gar Nash-Snyder. Se determinou a m?dia do n?mero de col?nias por triplicata e se expressou como unidades formadoras de col?nias por grama de alimento (UFC/g). Os AIN e alguns ALP (milho, milho mo?do, farinha de sorgo, farinha de milho e gl?ten) apresentaram contagens f?ngicas superiores a 104 UFC/g. As amostras de AC n?o superaram este valor. Cada cepa foi isolada e identificada a n?vel de g?nero. As esp?cies pertencentes ao g?nero Aspergillus prevaleceram em todas as amostras analisadas, sendo as esp?cies aflatoxicog?nicas, A. flavus/A. parasiticus, as de maior freq??ncia. Estas cepas foram avaliadas em sua habilidade de produzir aflatoxinas. Dos 100% das cepas isoladas de AIN, 80% de AC e 70% de ALP, foram capazes de produzir aflatoxinas em n?veis que variaram entre 2 e 66,25 ng/g. Se determinou a incid?ncia natural de aflatoxinas em todas as amostras de alimentos por cromatografia l?quida de alta efici?ncia. Os AIN e algumas amostras de ingredientes de ALP, principalmente aquelas compostas por milho, apresentaram n?veis de aflatoxinas superiores a 20 ppb. Os estudos histopatol?gicos e bioqu?micos dos ?rg?os dos animais afetados evidenciaram a causa morte (aflatoxicose), assim como tamb?m os estudos micotoxicol?gicos realizados: a carga f?ngica e os n?veis de aflatoxinas encontrados, foram superiores aos permitidos pelas regulamenta??es nacionais e internacionais em vig?ncia. Os alimentos comerciais pertencentes a distintas qualidades s?o alimentos aptos para o consumo mas, potencialmente perigosos em condi??es de armazenamento inadequado devido ? capacidade aflatoxicog?ncia das cepas estudadas. Quanto aos ingredientes e alimentos terminados da linha de produ??o, aqueles compostos por milho n?o cumpriram com os valores de fungos e aflatoxinas permitidos pela legisla??o. Embora a ra??o terminada se ajuste ao requerido pela regulamenta??o, provavelmente pelo processamento recebido, apresenta um risco potencial j? que mais de 80% das esp?cies de A. flavus foram capazes de produzir aflatoxinas B1 e B2. ? importante ent?o destacar a necessidade de realizar um controle adequado dos ingredientes utilizados na elabora??o de alimentos compostos, como tamb?m as condi??es ambientais onde se armazenam as ra??es destinadas aos c?es, para preserv?- los da indesejada contamina??o f?ngica e a conseq?ente produ??o de micotoxinas.
Souyri-Caporale, Michèle. "Etude du pouvoir tumorigene de l'oncogene n-ras." Paris 7, 1987. http://www.theses.fr/1987PA077083.
Full textGallagher, Julie Marie. "The synthesis of 1-acetamido-2,6-anhydro-1,7-deoxy-L-glycero-L-galactitol (N-[β-L-fucopyranosylomethyl]-acetamide) and related derivatives." Scholarly Commons, 1989. https://scholarlycommons.pacific.edu/uop_etds/2182.
Full textRocabois, Philippe. "Stabilité thermochimique des composites céramiques base SiC : approche thermodynamique et expérimentale du système Si-O-C-N." Grenoble INPG, 1993. http://www.theses.fr/1993INPG0085.
Full textYu, Haiqiang. "Determination of disulfide linkages in SEL 24K from salmon eggs and N-terminal and C-terminal sequencing of gp41 and gp37 from Xenopus laevis eggs with mass spectrometry." Scholarly Commons, 2006. https://scholarlycommons.pacific.edu/uop_etds/2718.
Full textVan, Der Stede Véronique. "Les pratiques de stockage au Proche-Orient du Natoufien au Dynastique Archaïque I (12.500 - 2700 av. J.-C.)." Doctoral thesis, Universite Libre de Bruxelles, 2002. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211379.
Full textDoho, Néhowé. "LA CONFERENCE DES NATIONS UNIES SUR LA SCIENCE ET LA TECHNIQUE AU SERVICE DU DEVELOPPEMENT ( C. N. U. S. T. D. ) (Vienne, Autriche, 20-31 août 1979)." Paris 5, 1988. http://www.theses.fr/1988PA05D007.
Full textOrganized in vienna, august 1979, the u. N. C. S. T. D. Is intended for adding to scientific and technical potential of developing countries and supply them with tools of cooperation to use science and technology to solve, according to national priorities, social and economic problems which cannot been resolved with insulated action of each country. To achieve one's ends, it adopted "vienne programme of action for science and technology for development" oriented in three principal directions : - to strengthen scientific and technical capacities in developing countries ; - to reorganize the structure of international scientific and technical relations; - to intensify united nations role in scientific and technical cooperation and to give much money. The last direction came to create new structures within the framework of the united nations. The more important of these structures is the financing system for science and technics for development. Faced with the difficulties to collect much money, it been suppressed and replaced with united nations found for science and technology for development
Oorts, Katrien. "Effet de travail du sol sur les stocks et flux de C et N dans un sol limoneux de grandes cultures du bassin Parisien." Phd thesis, Institut national agronomique paris-grignon - INA P-G, 2006. http://tel.archives-ouvertes.fr/tel-00011985.
Full textDELAGEBEAUDEUF, CLAIRE. "La phospholipase b digestive du cobaye. Implication des n-glycosylations dans les proprietes physiologiques de la proteine. Clonage de l'adn#c, etude de l'expression tissulaire et lors de la differenciation intestinale." Paris 11, 1996. http://www.theses.fr/1996PA112424.
Full textGypens, Nathalie. "Modélisation des efflorescences algales et des cycles du C, N, P et Si dans l'écosystème eutrophisé de la mer du Nord." Doctoral thesis, Universite Libre de Bruxelles, 2006. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210778.
Full textLe modèle validé a ensuite été utilisé pour étudier le fonctionnement de l’écosystème et les cycles biogéochimiques associés. Plus précisément, les bilans de carbone et de nutriments réalisés sur base des flux biologiques modélisés ont montré que l’écosystème de la BCZ, dominé par les efflorescences de Phaeocystis, se caractérise par une faible efficience trophique, une faible capacité de rétention/élimination des apports de nutriments d’origine anthropique et une faible capacité d’absorption du CO2 atmosphérique. Des scénarios annulant tour à tour l’activité biologique et les apports de carbone par les rivières ont permis de déterminer les rôles respectifs de la température, des processus biologiques et des apports de nutriments et de carbone par les rivières dans l’évolution saisonnière de la pCO2 des eaux de surface.
L’effet combiné des apports anthropiques de nutriments et des conditions météorologiques locales (débit, vent, température) a été étudié sur base d’une simulation effectuée pour la période contemporaine (1989-2003) en utilisant les forçages réels mesurés. La comparaison visuelle des simulations et des observations montre que, si le modèle est parfaitement capable de reproduire les successions phytoplanctoniques, il est par contre moins performant en ce qui concerne la reproduction des signaux extrêmes. Il apparaît donc que l’échelle de temps (mensuelle) utilisée pour décrire la variabilité des forçages est trop longue et ne permet pas de capter les variations hydrologiques à court terme résultant du vent et de la marée.
De manière à mieux comprendre le lien entre les activités humaines sur le bassin versant et l’eutrophisation des zones côtières, le modèle MIRO a été couplé aux sorties du modèle de rivière RIVERSTRAHLER appliqué à la Seine et à l’Escaut sur une période de 50 ans (1950-1998). Les résultats obtenus montrent que l’importance des efflorescences de diatomées est conditionnée par les apports de PO4, alors que l’importance des Phaeocystis est directement liée à l’importance des apports de NO3. Un bilan établi pour la BCZ montre que plus de 50% des apports annuels de N et 60% des apports annuels de P proviennent des eaux Atlantiques et pointe l‘importance des apports de la Seine pour l’enrichissement de la BCZ.
Différents scénarios de réduction des apports de nutriments provenant des rivières ont été réalisés afin de cibler le ou les nutriments à diminuer prioritairement pour réduire les efflorescences de Phaeocystis. Les résultats montrent que, dans les conditions actuelles, seule une réduction des apports de NO3 prédit une diminution des efflorescences de Phaeocystis. De plus, pour avoir un abattement significatif de ces efflorescences, il est nécessaire d’agir de manière conjointe sur les apports de la Seine et de l’Escaut.
En vue de l’implémentation du code MIRO dans un modèle 3D hydrodynamique et pour tenir compte de la variabilité spatiale des sédiments dans la zone étudiée, une paramétrisation des flux de nutriments à l’interface eau-sédiment a été recherchée sur base des résultats obtenus avec un modèle diagénétique analytique décrivant la dégradation de la matière organique et les cycles de l’azote et du phosphore dans les sédiments.
Doctorat en sciences, Spécialisation biologie animale
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Koptekin, Derya. "Experiencing Class Differences: The Case Of Food Retail Store Workers In Ankara Sinifsal Farkliliklarin Deneyimlenmesi: Ankara Market Iscileri Ornegi." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611967/index.pdf.
Full textPeyrat, Sandrine. "Vers la synthèse de C-glycosyl aminoxy peptides et d'oligomères de nucléosides aminoxy acides." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2011. http://tel.archives-ouvertes.fr/tel-00675657.
Full textNoël, Amandine. "Etude comparative de la réactivité des β-lactones et β-thiolactones. Synthèse stéréosélective d'α-C- et S-glycosides à partir de dérivés de l'acide N-acétylneuraminique." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00912334.
Full textPucci, Marinella Coutinho Jacinto. "Interações tróficas dos peixes e lulas da Baía do Araçá, município de São Sebastião (São Paulo, Brasil): uma abordagem pelo uso de isótopos estáveis." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/21/21134/tde-13122016-170637/.
Full textThe trophic interactions of 31 fish species and 2 squid species of the Araçá Bay, São Sebastião (São Paulo, Brazil), were investigated through carbon (δ13C) and nitrogen (δ15N) stable isotopes. The δ13C of the species ranged from -17.2‰ to -12.1‰, and the δ15N, from 10.0‰ to 14.5‰. The δ13C data of the producers and consumers indicated that the species analysed are part of the pelagic and benthic trophic webs, and have phytoplankton, microphytobenthos and organic matter from the sediment as the base of the food web. Higher values of δ13C were registered in the summer, linked to the higher values at the base. The trophic positions of the species varied between 3.18 e 4.72, an indication that they act as secondary and tertiary-quaternary consumers. The diet composition of fish, evaluated trough the isotope mixing model, showed high contribution of prey, such as Polychaeta, Tanaidacea and Ophiuroidea, groups highly abundant in the Bay and the adjacent São Sebastião Channel. The intake of available prey in the intertidal region and in the Channel revealed the importance of the fish and squid as nutrient pathway links, coupling the pelagic-benthic systems and the sublittoral and intertidal regions of the Araçá Bay.
Bieganski, Nicolas. "Recherches sur l'administration de la Thébaïde à l'époque ptolémaïque, 323-30 av. n. è." Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209845.
Full textDoctorat en Langues et lettres
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Massicot, France. "Etudes pharmacologiques et toxicologiques d'un régulateur métabolique : le chlorhydrate de chloro-4 phénoxyacétate d'hydroxyméthyl-3 N-méthyl pipéridine (PM 170)." Paris 7, 1986. http://www.theses.fr/1986PA077090.
Full textComont, Laure. "Étude des processus de stockage de la matière organique et de régénération des tourbières dégradées après exploitation : sites du Russey (Jura français), de la Chaux d'Abel (Jura suisse) et de Baupte (Cotentin, France)." Phd thesis, Université d'Orléans, 2006. http://tel.archives-ouvertes.fr/tel-00136118.
Full textabandonnées après exploitation est d'y permettre la réinstallation d'une production végétale
susceptible d'y réassurer la pérennité de la séquestration du carbone à long terme. Dans cette
perspective, les objectifs de cette étude étaient d'identifier des indicateurs de la reprise des
processus d'accumulation de la matière organique (MO) dans des tourbières anciennement
exploitées, actuellement à des stades de régénération spontanée différents. Dans le but d'identifier
l'origine de la MO et d'appréhender les modalités de sa dégradation, une combinaison d'approches
micromorphologiques, géochimiques globales et moléculaires a été appliquée à des échantillons de
tourbe brute et de fractions fines (< 200μm), ainsi qu'à des végétaux-sources typiques. La MO
accumulée dans les niveaux superficiels montre une composition très contrastée (forts C/N,
prédominance des tissus hérités bien préservés, fortes teneurs en sucres...) par rapport à celle,
beaucoup plus humifiée, des compartiments sous-jacents. Ceci a permis de délimiter précisément la
tourbe régénérée de la tourbe du catotelm. Contrairement aux stades de régénération précoces (5-10
ans), la composition de la MO des stades plus avancés (30-40 ans) est comparable à celle de la zone
non exploitée (MO homogène, dominance des marqueurs de sphaignes, forts C/N). Une analyse en
composante principale (ACP) a permis de proposer des trajectoires de régénération distinctes pour
chacun des sites d'étude, en fonction de leur végétation et de leur mode d'exploitation.
Globalement, la bonne préservation des polysaccharides dans la tourbe, clairement mise en lumière
dans cette étude, en fait de bons indicateurs de régénération.
Uglov, Alexey. "Synthèse de ligands macrocycliques comportant des fragments aromatiques et leur application pour la détection des cations métalliques." Phd thesis, Université de Bourgogne, 2011. http://tel.archives-ouvertes.fr/tel-00915467.
Full textBuzy, Armelle. "Développement de la spectrométrie de masse appliquée au séquençage protéique en association avec la dégradation d'Edman : détermination des structures primaires de la sous-unité Aa6 de l'hémocyanine du scorpion Androctonus australis et de la catalase bactérienne de Proteus mirabilis." Grenoble 1, 1993. http://www.theses.fr/1993GRE10019.
Full textBerlinet, Cécilia. "Etude de l'influence de l'emballage et de la matrice sur la qualité du jus d'orange." Phd thesis, ENSIA (AgroParisTech), 2006. http://pastel.archives-ouvertes.fr/pastel-00003516.
Full textBelaud-Rotureau, Mickaël. "Substitution nucléophile aromatique des acides benzoïques et naphtoïques ortho fluorés/méthoxylés non protégés (SNArAB) par les bases fortes (RLi, RMgX et R2NLi) en l'absence de catalyseur métallique." Phd thesis, Université du Maine, 2010. http://tel.archives-ouvertes.fr/tel-00510819.
Full textGonzalez-Maldonado, Noelymar. "Evaluating the Effects of Long-Term No-Till and Crop Rotations in Soil Health and Corn Productivity." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1557142156675221.
Full textGavériaux, Claire. "Etude de l'interaction entre l'immunoglobuline e et son recepteur de forte affinite : mise au point d'un nouvel essai immunoenzymatique sur cellules, le celisa, importance de la n-glycosylation et de l'activation de la proteine kinase c dans l'expresion fonctionnelle de ce recepteur." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13014.
Full textMedeiros, Simone de Fatima. "Obtenção de nanopartículas magnéticas sensíveis a estímulos para aplicações biomédicas." Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00836703.
Full textFoy, Denis. "Sur l'élaboration de nouveaux carbonitrures : des variétés graphitiques aux structures peu compressibles." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2007. http://tel.archives-ouvertes.fr/tel-00374077.
Full textGeorgiou, Andriani. "The cult of Flavia Iulia Helena in Byzantium : an analysis of authority and perception through the study of textual and visual sources from the fourth to the fifteenth century." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4175/.
Full textCorral, Marisol. "Caracterisation de genes cellulaires dont l'expression est associee a la cancerisation hepatique." Paris 6, 1987. http://www.theses.fr/1987PA066124.
Full textVian, Jean-François. "Comparaison de différentes techniques de travail du sol en agriculture biologique : effet de la structure et de la localisation des résidus sur les microorganismes du sol et leurs activités de minéralisation du carbone et de l'azote." Phd thesis, AgroParisTech, 2009. http://pastel.archives-ouvertes.fr/pastel-00005158.
Full textDalmet, Christophe. "La notion de denrées alimentaires." Phd thesis, Université d'Avignon, 2009. http://tel.archives-ouvertes.fr/tel-00629627.
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