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Dissertations / Theses on the topic 'Metaboliti volatili'

Author: Grafiati

Published: 11 March 2023

Last updated: 31 July 2025

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1

Andreola, Diego <1991&gt. "Elaborazione di un metodo di analisi per la determinazione di metaboliti volatili che consentono l'individuazione in fase precoce della presenza di muffe in ambienti chiusi mediante GC-MS e desorbimento termico." Master's Degree Thesis, Università Ca' Foscari Venezia, 2018. http://hdl.handle.net/10579/12137.

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La presente tesi conduce alla realizzazione di un metodo analitico efficace prendendo lo spunto iniziale nel lavoro di ricerca svolto da Stephane Moularat, brevettato nel 2012, che ha messo a punto uno schema algoritmico a risposta binaria considerando 16 diversi metaboliti prodotti dalle muffe ed altri 4 composti di natura sesquiterpenica. La risposta positiva o negativa, dovuta alla presenza o meno dei composti indagati nell’aria dell’ambiente campionato, porta ad un risultato definito come Indice di Contaminazione Fungina (ICF). Tale risultato viene dunque tradotto nella presenza (ICF > 0)

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2

Hess, Joerg. "Modelling the transport of volatile metabolites in the mouth." Thesis, University of the West of England, Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490457.

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The knowledge of the mechanisms giving rise to halitosis in the mouth is quite limited despite the social constraints the condition imposes and the attendant commercial interest that results. In part, this understanding is limited by the difficulties inherent in undertaking in vivo studies which are further exacerbated by the complexity of the systems under investigation, in particular, the influence of transport mechanisms such as salivary flow, pH, temperature and others had not been investigated. The research described here is based on a new approach to investigate the transport mechanisms

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3

El-Kader, M. S. A. M. A. "Production of Volatile Secondry Metabolites in Plant Tissue Cultures." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503643.

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4

Turon, Violette. "Coupling dark fermentation with microalgal heterotrophy : influence of fermentation metabolites mixtures, light, temperature and fermentation bacteria on microalgae growth." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS201/document.

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La production de microalgues en hétérotrophie présente plusieurs avantages pour la production de biocarburants par rapport à la production autotrophe, comme une productivité plus importante en termes de biomasse et de lipides. Cependant, le développement industriel de ce procédé est limité par les coûts de productions associés au substrat organique (i.e. glucose) et à ceux liés à la stérilisation des fermenteurs. Les effluents de fermentation sombre, composés principalement d’acétate et de butyrate, pourraient être utilisés comme milieux de culture peu onéreux pour la culture hétérotrophe ou m

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5

Cheung, William Hon Kit. "Metabolic profiling of volatile organic compounds and enhanced vibrational spectroscopy." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/metabolic-profiling-of-volatile-organic-compounds-and-enhanced-vibrational-spectroscopy(adcff7c7-96e3-4b5a-8d77-4a943b75f211).html.

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Metabolomics is a post genomic field of research concerned with the study of low molecular weight compounds within a biological system permitting the investigation of the metabolite differences between natural and perturbed systems (such as cells, organs and tissues). Rapid identification and discrimination of biological samples based upon metabolic differences and physiological status in microbiology, mammalian systems (particularly for disease diagnosis), plants and food science is highly desirable. Volatile organic compound (VOC) profiling is a novel area of research where the composition o

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6

Berrou, Kevin. "Développement d’outils innovants pour l'étude de l’infection chronique." Thesis, Nîmes, 2019. http://www.theses.fr/2019NIME0001.

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Un des enjeux majeurs dans la gestion de la plaie de pied diabétique est l’obtention d’informations permettant d’anticiper l’évolution de ces infections. Actuellement, il n’existe pas d’outils suffisamment efficaces qui permettent de distinguer une plaie colonisée d’une plaie infectée. L’approche proposée est basée sur discrimination de plusieurs bactéries fréquemment retrouvées dans les plaies chroniques de pied diabétique à partir de leur profil métabolique, et plus particulièrement des métabolites volatils qu’elles produisent. En effet, le dynamisme du métabolisme bactérien serait à même de

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7

Sohrabi, Mohsen. "Oral Microbiota and their Volatile Metabolites in Oral Squamous Cell Carcinoma." Thesis, Griffith University, 2016. http://hdl.handle.net/10072/366691.

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The majority of the oral neoplasms are oral squamous cell carcinoma (OSCC) which have been traditionally linked to consumption of tobacco and alcohol. The human papillomavirus (HPV) infection is also significantly associated with OSCC progression. However, the prevalence of this cancer in people with no record of those traditional factors emphasized the possibility of another significant factor that potentially contributes to OSCC. Bacteria have been strongly associated with some cancers especially in gastric cancer. Several microbial metabolites are categorised as carcinogens that suggest the

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8

Moalemiyan, Mitra. "Volatile metabolic profiling to detect and discriminate diseases of mango fruit." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97971.

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Volatile metabolites from headspace gas of mango cultivars Tommy Atkins and Keitt, wounded and inoculated with two pathogens, Colletotrichum gloeosporioides and Lasiodiplodia theobromae or non-inoculated controls were profiled using a GC/MS to develop a technology to discriminate diseases. Several disease discriminatory compounds were identified and classified into three groups: (i) compounds unique to only one treatment; (ii) compounds common to two or more treatments but not to all; and (iii) compounds common to all treatments but with varying in their abundance. 1-pentanol and boronic acid

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9

Robert-Hazotte, Aline. "Impact du métabolisme des molécules odorantes sur la perception olfactive chez l'Homme." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCK073.

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L’odorat est le sens qui permet de percevoir des substances volatiles appelées communément odeurs. Il joue un rôle important dans la subsistance et le bien être des individus car il intervient dans la communication avec leur environnement (recherche de nourriture, de partenaire, détection des prédateurs ...). L’efficacité du système olfactif repose en grande partie sur sa sensibilité, qui dépend de l’affinité des molécules odorantes pour leurs récepteurs olfactifs mais aussi d’un mécanisme de clairance enzymatique des molécules odorantes qui évite à ces récepteurs d’être saturés et qui impliqu

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10

Bahroun, Najat. "Detection of Salmonella in food samples using exogenous volatile organic compound metabolites." Thesis, Northumbria University, 2017. http://nrl.northumbria.ac.uk/32550/.

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Rapid, sensitive and selective detection and identification of pathogens is required in the prevention and recognition of problems related to food security. Salmonella is one of the dangerous foodborne pathogens. The identification of specific volatile organic compounds (VOCs) produced by Salmonella may contribute in providing a fast and accurate detection method for Salmonella in food samples. In this study, VOCs liberated by Salmonella strains have been identified and quantified via head space-solid phase microextraction coupled to gas chromatography/mass spectrometry (HS-SPME GC/MS). The do

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11

Maafi, Nasim. "Assessment of Volatile Metabolites for In Situ Detection of Fungal Decay of Wood." Thesis, Mississippi State University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10607671.

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<p> Although incipient fungal decay of wood may be difficult to detect early, it causes a significant decrease in wood strength. Developing a reliable method of decay identification to overcome wood replacement costs by non-destructive methods is necessary. This study investigates a possibility of identifying fungal volatile organic compounds (VOCs) as means of fungal detection using solid phase micro-extraction (SPME) coupled with gas chromatography–mass spectrometry (GC-MS). </p><p> Volatile emissions from two brown rot (<i>Gloeophyllum trabeum</i> and <i>Postia placenta</i>) and two

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12

Mayeux, Bruno. "Ecologie microbienne et métabolisme associé : étude de l'eau interstitielle et de la roche argileuse du Callovo-Oxfordien dans le Laboratoire de Recherche Souterrain de l’Andra (Meuse/Haute-Marne)." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4783/document.

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Dans le cadre des recherches de l'ANDRA sur le confinement en couche géologique profonde de déchets radioactifs, une étude microbiologique a été menée sur l'eau interstitielle et l'argile du Callovo-Oxfordien (–490m, 165 millions d'années). Deux types d'études ont été menés, culturale et moléculaire.Malgré différentes tentatives d'extractions, et comme pour les études antérieures effectuées, aucun ADN n'a pu être extrait au cours de ce travail. Par contre, une approche culturale a permis de mettre en évidence la présence d'une microflore peu dense mais viable et métaboliquement assez variée :

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13

Westling, Magnus. "Microbial Processes and Volatile Metabolites in Cheese Detection of Bacteria Using an Electronic Nose." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-42412.

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Cheese is a fermented product in which bacteria contribute to different flavours and textures. In order to understand the microbial processes in cheese, it is necessary to not only look at the genomic information in bacteria. The metabolome consists of a complete collection of metabolites in a biological sample. These metabolites are small molecules with a Mr >1.5 kDa, including flavour compounds. During the ripening process of cheese, many microbiological and biochemical changes occur that give cheese a diversity of textures and flavours. Proteins that go through proteolysis and amino acid

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14

Iamanaka, Beatriz Thie. "Avaliação da micobiota de grãos de café e dos metabolitos fungicos na qualidade da bebida." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/255262.

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Orientador: Neura Bragagnolo<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-08-15T03:05:45Z (GMT). No. of bitstreams: 1 Iamanaka_BeatrizThie_D.pdf: 2489716 bytes, checksum: f28d257a6355ac8f3f2829d99d83a8be (MD5) Previous issue date: 2010<br>Resumo: O café passa por vários processos até chegar a ser consumido como bebida e vários fatores contribuem para a sua qualidade final, dentre eles a população microbiana presente. A contaminação dos grãos pelos microrgranismos é diversificada, envolvendo a participação d

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15

Smith, Neil A. "Metabolism of dimethyl disulphide, carbon disulphide and other volatile sulphur compounds by chemolithoautotrophic sulphur bacteria." Thesis, University of Warwick, 1988. http://wrap.warwick.ac.uk/106592/.

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The isolation of a number of strains of bacteria able to grow on dimethyl disulphide (DMDS) and dimethyl sulphide (DNS) as sole sources of energy is described. The isolates came from diverse habitats including soil, peat, marine mud and a freshwater pond, and were morphologically and physiologically best described as thlobacilli capable of growth as Calvin cycle autotrophs on inorganic sulphur compounds, methylated sulphides or thiocyanate. One Isolate (E6) was examined in detail and analysis of its DNA showed a mean mol% G - C content of 60.5 ± 1.0 which is In the normal range of f. thioparua

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16

Manzato, Lorenzo. "Marker di degradazione in semilavorati dell'industria dolciaria." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16827/.

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L’industria dolciaria è in continua evoluzione e negli ultimi anni, accanto alle linee di produzione di dolci tradizionali, sono state introdotte linee di prodotti innovativi, confezionati in monoporzioni, definiti “merendine”. Questi alimenti sono estremamente complessi, solitamente costituiti da un impasto e da una farcitura (crema a base di cacao o nocciola, confetture di frutta). Entrambe le componenti possono subire alterazioni chimico-fisiche (raffermamento dell’impasto e ossidazione dei lipidi) e microbiologiche (sviluppo di batteri, lieviti e muffe). Nonostante alcune caratteristiche (

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17

Sharopov, Farukh [Verfasser], and Michael [Akademischer Betreuer] Wink. "Phytochemistry and bioactivities of selected plant species with volatile secondary metabolites / Farukh Sharopov ; Betreuer: Michael Wink." Heidelberg : Universitätsbibliothek Heidelberg, 2015. http://d-nb.info/1180502167/34.

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18

De, Jesʹus Victor Raʹul. "The role of fungal metabolic by-products in indoor air chemistry : analytical considerations for the evaluation of poor indoor environments." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/30704.

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19

Huh, Jung-Hyun. "Biochemical, Molecular and Functional Analysis of Volatile Terpene Formation in Arabidopsis Roots." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77151.

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Plants produce secondary (or specialized) metabolites to respond to a variety of environmental changes and threats. Especially, volatile compounds released by plants facilitate short and long distance interaction with both beneficial and harmful organisms. Comparatively little is known about the organization and role of specialized metabolism in root tissues. In this study, we have investigated the root-specific formation and function of volatile terpenes in the model plant Arabidopsis. As one objective, we have characterized the two root-specific terpene synthases, TPS22 and TPS25. Both en

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20

Young, Michael J. "Characterization of Volatile and Metabolite Compounds Produced by Lactococcus lactis in Low-Fat and Full-Fat Cheddar Cheese Extract." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/1029.

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This study was conducted to compare and contrast potential aroma compounds in the headspace and small molecule metabolites produced as a result of starter culture metabolism in a full-fat and low-fat cheddar cheese model system. Past studies have indicated differences in the headspace flavor compound profiles between full-fat and low-fat Cheddar cheeses with no indication as to what compounds were produced as a result of starter culture metabolism. Starter cultures were incubated in a Cheddar cheese extract environment that was made up of the water-soluble portion of Cheddar cheese with enviro

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21

Malcom, Annie, Kaitlyn Webb, and W. Andrew Clark. "Profile of Volatile Fatty Acids in The Feces Of Normal And Overweight College Students." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/2512.

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22

Rodríguez, Baixauli Ana María. "Genetic engineering of plant volatiles in fleshy fruits: pest repellency and disease resistance through D-limonene downregulation in transgenic orange plants." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/31655.

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Los terpenos constituyen el mayor grupo de metabolitos secundarios, siendo componentes de las glándulas de aceites esenciales, de las flores y de las resinas defensivas de plantas aromáticas, a los que proporcionan sus aromas y sabores característicos. Los terpenos volátiles se asocian a la defensa de muchas especies de plantas, animales y microorganismos contra depredadores, patógenos y competidores. Por otra parte, estos compuestos parecen servir como señales para atraer a los polinizadores y agentes dispersores de semillas, así como a depredadores de plagas. El estudio de compues

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23

Taylor, Tyeen Colligan, and Tyeen Colligan Taylor. "Leaf Volatile Emissions Structure Tree Community Assembly and Mediate Climate Feedbacks in Tropical Forests." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/623061.

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The biochemistry of leaves merges the fates of trees and the atmosphere. Leaf primary metabolism cycles carbon and indirectly drives atmospheric circulation via the latent heat of transpiration. Tropical forests contain half of global forest carbon, and actively cycle carbon and energy year round, making them critical components of the coupled biosphere-climate system. Climate change threatens tropical forests with rising temperatures and increasing variability of precipitation. Their response will influence future biodiversity as well as the fate of the climate. Understanding the physiologica

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Kotani, Tetsuya. "Novel metabolic pathways for microbial oxidation of propane and ethyl t-butyl ether as volatile organic compounds." Kyoto University, 2006. http://hdl.handle.net/2433/136493.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第12559号<br>農博第1578号<br>新制||農||931(附属図書館)<br>学位論文||H18||N4175(農学部図書室)<br>UT51-2006-P19<br>京都大学大学院農学研究科応用生命科学専攻<br>(主査)教授阪井康能, 教授清水昌, 教授喜多恵子<br>学位規則第4条第1項該当

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25

Beckett, Linda Marie. "Effects of ruminal nutrient degradability on volatile fatty acid dynamics, ruminal epithelial gene expression, and post-absorptive system." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/87471.

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This study evaluated degradable nutrient supply effects on VFA concentrations, fluid flux and pool sizes, rumen epithelial metabolic and absorptive genes, and post-absorptive muscle and blood responses. Six ruminally cannulated Holstein heifers (BW=330 ± 11.3 kg) were used in a partially replicated Latin Square experiment with four treatments consisting of beet pulp or timothy hay and barley or corn grain. Periods were18 d with 3 d diet adaptation and 15 d of treatment. During each period, d 10 to 14 was used for in situ nutrient degradation assessment, d 16 to 18 was used for rumen fluid samp

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Kuppusami, Sharmilah. "Metabolite profiling of biological specimens using small molecular weight volatile organic compounds by proton transfer reaction time-of-flight mass spectrometry." Thesis, University of Leicester, 2017. http://hdl.handle.net/2381/39892.

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Metabolite profiling is an analytical study of metabolites that are of low molecular weight which results from normal and pathological cellular processes, using high throughput analytical technologies. This thesis documents the development of the analytical technique of proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS) for the analysis of small molecular weight volatile organic compounds (VOCs) in different biological specimens. The work explored the challenges associated with sampling, analysis, and metabolite profiling and identification in microbiology and clinical stud

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Costa, Carina Filipa Pedrosa da. "Volatile exometabolone analysis of Aspergillus niger and search for molecular biomarkers pattern." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14864.

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Mestrado em Biologia Aplicada - Microbiologia Clínica e Ambiental<br>Fungal infections have greatly increased in risk populations, namely in immunocompromised patients, probabily because the diagnosis of fungal infections is delayed. Microbial metabolomics arises as a powerful feature screening the metabolites produced by microorganisms. It provides information regarding the state of biological organisms which can be used as a diagnostic tool for diseases through fungal metabolites pattern. Thus, this research aimed to in-depth study of the Aspergillus niger exometabolome, in order to es

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Jimenez, lorenzo Rafael. "Comprendre la production des composés volatils soufrés par Saccharomyces cerevisiae pendant la fermentation oenologique." Electronic Thesis or Diss., Montpellier, SupAgro, 2021. http://www.theses.fr/2021NSAM0057.

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La consommation de vin est une pratique culturelle, qui, depuis ses origines historiques caucasiennes et moyen-orientales, s'est largement répandue dans presque tous les pays du monde, notamment autour du bassin méditerranéen où la vigne est cultivée depuis environ 1000 ans avant Jésus-Christ. Ainsi, depuis l'Antiquité, le vin est essentiel dans les traditions européennes. Ces habitudes de consommation, développées sur une longue période, se sont donc profondément enracinées dans la culture de notre société et sont l'expression d'une convergence culturelle (Knibee et al., 1996). Aujourd'hui, 3

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Grousseau, Estelle. "Potentialités de production de Poly-Hydroxy-Alcanoates (PHA) chez Cupriavidus necator sur substrats de type acides gras volatifs : études cinétiques et métaboliques." Thesis, Toulouse, INSA, 2012. http://www.theses.fr/2012ISAT0002/document.

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L’accumulation de biopolymère de réserve (PolyHydroxyAlcanoates ou PHA) par la souche Cupriavidus necator, à partir de substrats de type acides gras volatils (acide butyrique, acide propionique et acide acétique) a été étudiée. Elle est induite par une limitation phosphore. Les performances atteintes lors des cultures se situent parmi les meilleures de la littérature pour ce type de substrat : jusqu’à 66 g.L-1 de biomasse totale avec un pourcentage d’accumulation massique de 88% en PHB –PolyHydroxyButyrate- ou en PHB-co-HV -PolyHydroxyButyrate-co-HydroxyValerate- comportant jusqu’à 52% de moti

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Sohrabi, Reza. "Biochemical and Functional Characterization of Induced Terpene Formation in Arabidopsis Roots." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/74938.

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Plants have evolved a variety of constitutive and induced chemical defense mechanisms against biotic stress. Emission of volatile compounds from plants facilitates interactions with both beneficial and pathogenic organisms. However, knowledge of the chemical defense in roots is still limited. In this study, we have examined the root-specific biosynthesis and function of volatile terpenes in the model plant Arabidopsis. When infected with the root rot pathogen Pythium irregulare, Arabidopsis roots release the acyclic C11-homoterpene (E)-4,8-dimethylnona-1,3,7-triene (DMNT), which is a common co

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Valdetara, F. "STUDY OF THE VOLATILE PHENOL METABOLISM AND ROLE OF SO2 AS STRESS AGENT IN BRETTANOMYCES/DEKKERA BRUXELLENSIS UNDER WINE CONDITIONS." Doctoral thesis, Università degli Studi di Milano, 2017. http://hdl.handle.net/2434/541053.

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Biological spoilage of wine arises from yeasts and bacteria metabolic activity. Brettanomyces/Dekkera bruxellensis, one of the main contaminating yeast, is able to produce unpleasant compounds, such as vinyl and ethyl phenols (VPs). These off-flavors define the so called “Brett” character. Two enzymes, the cinnamate decarboxylase (CD) and the vinylphenol reductase (VPR), are involved in the spoilage activity. Sulphur dioxide (SO2) is the most common additive used to prevent and/or control microbial contamination in many foods, but decreasing its use is advisable both for limiting the detriment

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Quadri, Syeda. "Metabolomics Investigation of Glyceollins by On-Line Liquid Chromatography-Electrospray Ionization Tandem Mass Spectrometry and Fungal Metabolite Identification by Thermal Desorption Analysis Coupled with Gas Chromatography-Mass Spectrometry." ScholarWorks@UNO, 2013. http://scholarworks.uno.edu/td/1701.

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Metabolomics is an emerging field that entails the detailed characterization of the ensemble of metabolites produced by living organisms; subfields include drug metabolism and natural environmental toxin production. The first part of the dissertation pursued metabolism of glyceollins, i.e., isoflavones produced by soybeans, that are potential cancer therapy agents. In vivo glyceollin metabolites produced in rats were investigated by on-line Liquid Chromatography-Electrospray Ionization Tandem Mass Spectrometry. An odd-electron fragment ion at m/z 148, formed in violation of the even-electron r

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Nieminen, T. (Timo). "Detection of harmful microbes and their metabolites with novel methods in the agri-food production chain." Doctoral thesis, University of Oulu, 2009. http://urn.fi/urn:isbn:9789514290039.

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Abstract This thesis aimed at developing methods for tracking the environmental origins of microbial contaminants of the food chain. We worked on three targets: i) environmental mycobacteria ii) toxinogenic Bacillus species iii) post-harvest fungi in strawberry jam. Our aim was to develop methods for early detection of the above contaminants, which have the potential to endanger consumer health. We developed a novel method based on 16S rRNA hybridization for tracking the reservoirs of potentially pathogenic environmental mycobacteria in piggeries and soil. From 1010 to 1012 16S rRNA molecules

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Koley, Somnath [Verfasser], Björn Gutachter] Junker, Jörg [Gutachter] [Degenhardt, and Lars Mathias [Gutachter] Blank. "Metabolic flux analysis for biosynthesis of volatile terpenoids in model Lamiaceae plants / Somnath Koley ; Gutachter: Björn Junker, Jörg Degenhardt, Lars Mathias Blank." Halle (Saale) : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2020. http://d-nb.info/1226764223/34.

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Saptalena, Lena Ganda [Verfasser], Ursula [Akademischer Betreuer] Telgheder, and Karl [Akademischer Betreuer] Molt. "Determination of volatile metabolites of fecal contaminants in water samples by differential mobility spectrometry / Lena Ganda Saptalena. Gutachter: Karl Molt. Betreuer: Ursula Telgheder." Duisburg, 2014. http://d-nb.info/1050933362/34.

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Reis, Leticia. "Role of ethylene in non-volatile compounds during strawberry maturation and changes in sugar metabolism during melon maturation – new studies about non-climacteric fruit ripening." Universidade Estadual de Ponta Grossa, 2018. http://tede2.uepg.br/jspui/handle/prefix/2757.

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Submitted by Angela Maria de Oliveira (amolivei@uepg.br) on 2019-03-13T20:32:40Z No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Leticia Reis.pdf: 1857887 bytes, checksum: c5958c1e2ba4b807200b9f42a266b1d9 (MD5)<br>Made available in DSpace on 2019-03-13T20:32:40Z (GMT). No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Leticia Reis.pdf: 1857887 bytes, checksum: c5958c1e2ba4b807200b9f42a266b1d9 (MD5) Previous issue date: 2018-10-24<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Em virtu

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Silva, Simone Vieira da. "Prospecção de compostos orgânicos voláteis e seus efeitos na auto-regulação fisiológica em cianobactérias." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/9/9141/tde-12122017-124445/.

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Apesar dos diversos estudos sobre a presença de cianobactérias e a correlação entre fatores ambientais que influenciam ou desencadeiam florações, é ainda incipiente a informação sobre o controle fisiológico e bioquímico da produção de metabólitos secundários, cianotoxinas e compostos orgânicos voláteis (COVs) nestes organismos. Os COVs mais comumente encontrados em cianobactérias são a geosmina e o 2- metil-isoborneol, compostos que resistem ao tratamento convencional da água, causam mau cheiro e alteram seu gosto, além de bioacumular em peixes e moluscos. Estudos sobre possíveis sistemas de c

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Lawrence, Nina. "Volatile metabolic profiling of SA Chenin blanc fresh and fruity and rich and ripe wine styles : development of analytical methods for flavour compounds (aroma and flavour) and application of chemometrics for resolution of complex analytical measurements." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20331.

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Thesis (MSc)--Stellenbosch University, 2012<br>ENGLISH ABSTRACT: The aroma and flavour of wine are important aspects that form the basis for consumers’ organoleptic experience of wine. Therefore, an understanding of the chemical composition of wine aroma is of major importance, to establish possible links between wine chemistry, sensory attributes and consumer preference for a product. For this purpose analytical chemistry and multivariate techniques are indispensable tools for the metabolic profiling of wine. Chenin blanc is one of the most important South African export white wine var

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Sánchez, Gerardo. "Cartografiado de QTL y genes candidatos asociados a metabolitos determinantes de la calidad de fruto en melocotón." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/34511.

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Tradicionalmente los programas de mejora del melocotón (Prunus persica (L.) Batsch) se centraron fundamentalmente en la obtención de genotipos elite de alta productividad, resistentes a plagas y patógenos, adaptados a diferentes zonas agroecológicas y que produzcan frutos de gran tamaño y buen aspecto. Como resultado, muchos de estos programas han obtenido cultivares de excelentes características agronómicas. No obstante, el mejoramiento selectivo hacia caracteres agronómicos puede ir en detrimento de la calidad organoléptica del fruto como fue demostrado en el caso de fresa y tomate donde alg

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Di, Santo Ludmilla Geraldo [UNESP]. "Processamento do alimento e sua influência sobre o consumo, digestibilidade e parâmetros bioquímicos de papagaios-verdadeiro (Amazona aestiva)." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/149784.

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Submitted by Ludmilla Geraldo Di Santo (ludmilladisanto@gmail.com) on 2017-01-17T12:03:54Z No. of bitstreams: 1 Dissertação - Ludmilla G. Di Santo.pdf: 3078536 bytes, checksum: 616541b6ae12fdbebca39fc3495b629c (MD5)<br>Rejected by LUIZA DE MENEZES ROMANETTO (luizamenezes@reitoria.unesp.br), reason: Solicitamos que realize uma nova submissão seguindo as orientações abaixo: O arquivo submetido não contém o certificado de aprovação (obrigatório). No campo “Versão a ser disponibilizada online imediatamente” foi informado que seria disponibilizado o texto completo porém no campo “Data para

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Nascimento, Carolina Fernanda Moysés do. "Emissão de metano por bovinos Nelore ingerindo Brachiaria brizantha em diferentes estádios de maturação." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/10/10135/tde-19102007-134319/.

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Objetivou-se avaliar a taxa de emissão de metano (CH4) pela técnica do gás traçador hexafluoreto de enxofre (SF6) e fermentação ruminal dos animais alimentados com feno de Brachiaria brizantha em diferentes estágios de crescimento. Os três tratamentos foram: I-Feno de Brachiaria brizantha com 15 dias de crescimento, II- Feno de Brachiaria brizantha com 45 dias de crescimento e III- Feno de Brachiaria brizantha com 90 dias de crescimento. Seis bovinos da raça nelore, machos, castrados, canulados no rúmen e com peso médio inicial de 402 ± 51,62 kg foram utilizados em delineamento em quadrado lat

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Gutsche, Kerstin Amelie [Verfasser], Rudi F. [Akademischer Betreuer] Vogel, Peter [Akademischer Betreuer] Schieberle, and Wilfried [Akademischer Betreuer] Schwab. "Production of volatile metabolites in model fermentations and in raw sausages by Lactobacillus sakei / Kerstin Amelie Gutsche. Gutachter: Peter Schieberle ; Wilfried Schwab ; Rudi F. Vogel. Betreuer: Rudi F. Vogel." München : Universitätsbibliothek der TU München, 2012. http://d-nb.info/1024161404/34.

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Possenti, Rosana Aparecida. "Efeitos de dietas com Leucaena leucocephala com ou sem adição de Sacharomyces cerevisiae na digestão, fermentação, protozoários e produção de metano no rúmen em bovinos." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/74/74131/tde-18072006-135007/.

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O presente trabalho teve como objetivo avaliar os efeitos do uso de leucena (Leucaena leucocephala (Lam.) de wit), em dietas para bovinos com ou sem adição de levedura (Saccharomyces cerevisiae) sobre a digestão (degradabilidade e digestiilidade), fermentação (produção de ácido graxos voláteis, amônia e metano) e população de protozoários no rúmen. Foram utilizados quatro bovinos machos mestiços, com peso vivo médio de 797 kg, canulados no rúmen em experimento com delineamento Quadrado Latino 4x4 em arranjo fatorial 2x2 com dois níveis leucena (20% e 50%) com feno de Cynodon dactylon cultivar

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Liu, Hung-Jyh. "Volatile fatty acid and formic acid metabolism in sheep : a thesis submitted to the University of Adelaide in fulfilment of the requirements for the degree of Master of Agricultural Science." Title page, contents and summary only, 1990. http://web4.library.adelaide.edu.au/theses/09A/09al783.pdf.

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Includes bibliographical references (leaves 59-79) Examines the metabolism of volatile fatty acid and formic acid in fed sheep. Develops a method for analysing and qualifying volatile fatty acids with special reference to formic acid in biological fluids by High-Performance Liquid Chromatography.

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Kistler, Martin Verfasser], de Angelis Martin [Akademischer Betreuer] [Gutachter] [Hrabé, Wolfgang [Gutachter] Wurst, and Martin [Gutachter] Klingenspor. "Monitoring of volatile organic compounds in mouse breath as a new tool for metabolic phenotyping / Martin Kistler ; Gutachter: Martin Hrabé de Angelis, Wolfgang Wurst, Martin Klingenspor ; Betreuer: Martin Hrabé de Angelis." München : Universitätsbibliothek der TU München, 2016. http://d-nb.info/1123729239/34.

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Liu, Zhenhua. "Evolutionary mechanisms of plant adaptation illustrated by cytochrome P450 genes under purifying or relaxed selection." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAJ008.

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Les plantes produisent une remarquable diversité de métabolites pour faire face aux contraintes d’un environnement en constante fluctuation. Cependant la manière dont les plantes ont atteint un tel degré de complexité métabolique et les forces responsables de cette diversité chimique reste largement incomprise. On considère généralement que le mécanisme de duplication des gènes contribue pour une grande part à l’évolution naturelle. En absence de transfert horizontal, les gènes d’évolution récente se cantonnent généralement chez quelques espèces et sont soumis à une évolution rapide, alors que

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Lee, Andrew H. "Impact of cocoa (Theobroma cacao L.) fermentation on composition and concentration of polyphenols: Development of fermentation model system and utilization of yeast starter cultures." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/88515.

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Consumption of cocoa and dark chocolate products has been associated with positive health outcomes including reduced onset of cardiovascular disease, inflammation, diabetes, obesity, and platelet disorders. Cocoa polyphenols, putatively responsible for these beneficial activities, are highly impacted by cocoa variety, agronomic effects and processing history. However, the difference in polyphenol concentration and composition between cocoa products originating from different hybrid clones (selected for high yield) or from different fermentation conditions is not fully understood. Detailed poly

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Sherif, Mohammed Said Zaki [Verfasser], Petr [Akademischer Betreuer] [Gutachter] Karlovsky, Richard [Gutachter] Splivallo, and Andreas von [Gutachter] Tiedemann. "Effect of mycotoxin production on interactions between Fusarium species during maize infection and on the production of volatile metabolites / Mohammed Said Zaki Sherif ; Gutachter: Petr Karlovsky, Richard Splivallo, Andreas von Tiedemann ; Betreuer: Petr Karlovsky." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2017. http://d-nb.info/1124680535/34.

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Scheffler, Laura [Verfasser], Andrea [Akademischer Betreuer] Buettner, Andrea [Gutachter] Buettner, and Jessica [Gutachter] Freiherr. "Characterization of biotransformation and excretion processes of garlic and ramson volatiles in humans: Influence on the aroma and metabolite profile of breast milk and urine / Laura Scheffler ; Gutachter: Andrea Buettner, Jessica Freiherr ; Betreuer: Andrea Buettner." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2019. http://d-nb.info/1189424703/34.

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MASACHCHIGE, C. N. N. NANAYAKKARAWASAM. "STUDY OF THE EFFECT OF ABIOTIC AND BIOTIC STRESS ON THE GROWTH DEVELOPMENT AND SECONDARY METABOLISM OF MEDICINAL PLANT SPECIES." Doctoral thesis, Università degli Studi di Milano, 2012. http://hdl.handle.net/2434/168729.

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Achillea collina Becker ex Rchb., a medicinal plant rich in volatile compounds, was used to study the effects of biotic and abiotic stresses over plant growth and secondary metabolism. Biotic stress was induced by Myzus persiceae Sulzer and Macrosiphoniella millefolii (De Geer ), a generalist and specialist aphid species respectively. Abiotic stress was caused by mechanical damages provoked by a pin and a specially built equipment which apply a controlled and extended pressure to the plants. Plant growth and volatile compounds emissions were evaluated in the different experimental condi

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