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Dissertations / Theses on the topic 'Microbial cultures'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Pereira, Joana Sofia Marques. "Bioplastics production through mixed microbial cultures eco-engineering." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/21085.

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Mestrado em Biotecnologia<br>Bioplastics have been the focus of interest as a sustainable alternative to conventional plastics. Among those, polyhydroxyalkanoates (PHA) can be highlighted, not only for their biocompatibility and biodegradability, but also because they can be produced by mixed microbial cultures (MMC) from agro-industrial wastes. This allows to substantially reduce the production costs and valorize alternative substrates. PHA have a wide range of characteristics according to their composition, which allows them to be used in many applications. The polymers characteristic

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2

Sheppard, John D. "Feedback control and the continuous phasing of microbial cultures." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74242.

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Continuous phasing is a technique for cell culturing that is able to reveal metabolic responses during the cycle of cell growth and division. This is accomplished by the correspondence between the periodic addition of a limiting nutrient and the time required for the growth of a generation of cells. The utility of the technique was greatly improved by the development of a feedback system to control the period of nutrient addition. The production of the biosurfactant surfactin was studied using Bacillus subtilis ATCC 21332. The feedback control system was effective in optimizing the period of n

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3

Montiel, Jarillo Gabriela. "Polyhydroxyalkanoates production alongside wastewater treatment by mixed microbial cultures." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/666623.

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El enfoque de este trabajo de investigación es analizar el proceso de producción de polihidroxialcanoatos (PHA) en paralelo al tratamiento de aguas residuales. Los PHA se consideran sustitutos potenciales de los plásticos convencionales y dentro del concepto de economía circular, son considerados como productos de valor añadido. Sin embargo, los altos costos durante la producción, han limitado un uso extensivo de los PHA. En los últimos años se han invertido esfuerzos en el desarrollo de alternativas de bajo costo que mejoren el rendimiento del proceso reduzcan los precios de obtención. El pro

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4

Queirós, Diogo Cerqueira. "Valorization of industrial residues through mixed microbial cultures eco-engineering." Doctoral thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22465.

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Doutoramento em Engenharia Química - Bioengenharia<br>Hoje em dia, há uma necessidade urgente de reinventar os processos industriais a partir dos quais a nossa sociedade subsiste, tornando-os mais sustentáveis. A União Europeia (UE) estabeleceu um conjunto de pacotes com medidas que abrangem todo o ciclo: desde a produção ao consumo e à gestão de resíduos, e quanto ao mercado de matérias-primas secundárias. Pretende-se, com isto, caminhar em direção a uma economia circular, dando um destino diferente a todos os resíduos gerados. Em Portugal, umas das maiores e principais atividades económicas

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5

Wilson, Craig Stewart. "The biodegradation of nitriles by pure and defined mixed cultures of bacteria." Thesis, University of Kent, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242890.

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6

Bale, S. J. "The selection of haloaliphatic acid dehalogenases in continuous-flow cultures of Pseudomonas putida." Thesis, Cardiff University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384225.

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7

Phillips, David Gray 1949. "Acclimation of mixed cultures for phenol biodegradation." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276811.

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Experiments were conducted to examine the cause of lag-phase growth during phenol degradation by mixed microbial cultures that had been acclimated to one of four substrates. Four aerated Imhoff cones were inoculated with wastewater sludge and fed one of four substrates: acetate, egg albumin, vegetable oil, or phenol. Inocula from these cones were injected into batch reactors containing phenol. Time-dependent growth was measured by two methods: most probable number (MPN) and epifluorescence microscopy (EM). The MPN technique was used to distinguish two cell concentrations: total cells and a phe

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8

Oh, Dong-Chan. "New secondary metabolites from the marine actinomycete, Salinispora, and microbial co-cultures /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3236625.

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9

Asilonu, Ernest Ozuruonye. "The effects of oligosaccharides on production of secondary metabolites in microbial cultures." Thesis, University of Westminster, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322994.

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10

Tsipa, Argyro. "Connecting transcriptional regulation and microbial growth kinetics in cultures of Pseudomonas putida." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/52631.

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Bioprocesses performance is monitored using microbial growth kinetics models. However most of them are empirical and unstructured ignoring molecular and transcriptional interactions thus failing in accurate prediction. Pseudomonas putida mt-2, which harbours the TOL plasmid, is a strain of great biotechnological potential. M-xylene and toluene are commonly utilised by TOL pathway while toluene enables chromosomal ortho-cleavage pathway activation. Herein, the transcriptional kinetics of TOL and key ortho-cleavage promoters which control substrate bioconversion resulting in biomass formation wa

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11

Carmo, Inês Miguel Troles Duarte do. "Food waste valorization through the production of polyhydroxyalkanoates by mixed microbial cultures." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/10454.

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Dissertação para obtenção do Grau de Mestre em Engenharia Química e Bioquímica<br>Polyhydroxyalkanoates (PHAs) are polyesters of hydroxyl fatty acids, which are accumulated in microbial cells as carbon/energy reserves. PHAs are bio-based and biodegradable and display a wide range of thermoplastic properties, being a promising alternative to conventional plastics. Presently, industrial PHA production was primarily based on pure microbial cultures. Although this process has high PHA production efficiency, it presents high costs associated with the use of chemically-defined feedstocks, and to

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12

Fidalgo, Ana Rita Fernandes Ribeiro Moita. "Microbial contribution to biofuels production." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2014. http://hdl.handle.net/10362/13113.

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Dissertação para obtenção do Grau de Doutor em Engenharia Química e Bioquímica<br>Biomass can be converted into biofuels by two different ways: thermochemical or biochemical. Both processes produce waste streams that can be valorised in order to increase the sustainability of the biofuels production process. Recent research on polyhydroxyalkanoates(PHA) production has focused on developing cost-effective processes using low cost substrates combined with mixed microbial cultures (MMC). The intent of this thesis was to study and characterise MMC able to produce PHA using the by-products resu

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13

Bolaji, Efeoluwa Omotola. "Anaerobic fermentation of organic wastes for chemical production by undefined mixed microbial cultures." Thesis, University of Aberdeen, 2018. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=236961.

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14

Reis, Iolanda Maria da Silva. "Segregated modeling and selection of populations for polyhydroxyalkanoate production by mixed microbial cultures." Master's thesis, Faculdade de Ciências e Tecnologia, 2008. http://hdl.handle.net/10362/9664.

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15

Herwig, Christoph. "On-line exploitation tools for the quantitative analysis of metabolic regulations in microbial cultures /." Lausanne, 2001. http://library.epfl.ch/theses/?nr=2484.

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16

Mortan, Siti Hatijah. "Anaerobic microbial transformation of chlorinated alkanes in cultures derived from Besòs River estuary sediments." Doctoral thesis, Universitat Autònoma de Barcelona, 2017. http://hdl.handle.net/10803/405243.

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Els compostos orgànics halogenats (organohalogenats) són recalcitrants i presenten efectes tòxics per la salut humana i l’ecosistema. A partir d’uns sediments de la desembocadura del riu Besòs (Barcelona, Espanya) es va establir un cultiu anaerobi estable i no metanogènic que exclusivament dehalogenava cloro- i bromoalcans que tenen els àtoms d’halògens en carbonis adjacents via dihaloeliminació. L’aplicació de cebadors específics derivats a partir del gen 16rRNA de diferents bacteris dehalorespiradors junt amb les observacions fisiològiques del cultiu declorador indicaren que una soca de

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17

Buers, Katy Louise Mary. "A treatment process for the degradation of metal-working fluids using mixed microbial cultures." Thesis, University of Kent, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242930.

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18

Sousa, Rita Daniela Marques. "Industrial byproducts acidification to produce microbial substrates." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/21087.

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Mestrado em Biotecnologia<br>The excessively use of fossil fuels led to the necessity of more sustainable processes using renewable resources, such as biomass. Due to its abundance, low cost and broad availability, lignocellulosic biomass is a promising substrate for the production of chemicals and energy, among others. Short-chain organic acids (SCOA) have a great potential not only due to their wide applicability, but also to the fact that they can be produced biologically through acidogenic fermentation (AF) from renewable resources, such hardwood sulfite spent liquor (HSSL). The optimizati

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19

Sá, Fernando Luís de Góis Rodrigues de. "Separation and purification of microbial bioplastics." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22681.

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Mestrado em Biotecnologia - Biotecnologia Industrial e Ambiental<br>Os polihidroxialcanoatos são poliésteres biodegradáveis produzidos por inúmeros organismos. Possuem características muito semelhantes às dos plásticos, apresentando-se como um possível substituto dos mesmos. Os PHAs são produzidos na forma de corpos de inclusão, sendo necessária a sua extração. Os surfactantes são compostos tensioativos capazes de extrair os PHAs, através da sua incorporação, e consequente saturação, nas membranas bacterianas, auxiliando na sua lise. Neste trabalho começou-se por testar a eficácia de uma varie

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20

Roberts, Malcolm. "Studies with tissue cultures of tripterygium wilfordii. Isolation of metabolites and biotransformation studies." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30824.

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In a program aimed at the identification of compounds responsible for the immunosuppressive and antifertility activities of the perennial twining vine, Tripterygium wilfordii. 5 new and 13 known compounds were isolated from the TRP-4a tissue culture cell line developed from Tripterygium wilfordii. The structures of the new compounds were determined by a combination of spectral analysis, chemical correlation and single crystal X-ray diffraction analysis. 22β-Hydroxy-3-oxoolean-12-en-29-oic acid (137), 22α-hydroxy-3-oxoolean- 12- en-29-oic acid (138) and 3β, 22β-dihydroxyolean-12-en-29-oic aci

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21

Kiskira, Kyriaki. "Nitrate removal and Fe(III) recovery through Fe(II)-driven denitrification with different microbial cultures." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1040/document.

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La dénitrification autotrophe utilisant le fer Ferreux est un bioprocédé innovant pour l'élimination des nitrates, en même temps que l'oxydation du fer dans les eaux usées. Les dénitrifiants chimio-autotrophes convertissent le nitrate en azote gazeux et l'oxydation du Fe(II) conduit à la production de précipités de fer ferrique qui peuvent ensuite être enlevés et récupérés. La possibilité de maintenir une dénitrification autotrophe avec le fer ferreux en utilisant une culture mixte de Thiobacillus, un inoculum de boue activée et des cultures pures de la souche Pseudogulbenkiania 2002 et de T.

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22

Pinto, Fátima Cristina Romão Vieira. "Advances on the production of polyhydroxyalkanoates (PHA) by mixed microbial cultures from sugar cane molasses." Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/7868.

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23

Tang, Xiaoyan. "Biomasse et communautés microbiennes en relation avec la disponibilité du phosphore dans la rhizosphère de cultures associées." Thesis, Montpellier, SupAgro, 2013. http://www.theses.fr/2013NSAM0043/document.

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Le phosphore (P) est un nutriment majeur qui est souvent limitant pour la croissance des plantes dans les agro-écosystèmes mais le caractère non renouvelable des réserves en roches phosphatées rend urgente la nécessité de trouver une alternative aux fertilisants phosphatés et de mieux utiliser les ressources en P du sol. Dans ce contexte, l'objectif de ma thèse était d'élucider l'implication de processus rhizosphériques déterminant la disponibilité de P du sol dans des cultures associées céréale/légumineuse, et in fine l'acquisition de P par ces associations. Nous avons fait l'hypothèse que la

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24

Fähndrich, Laura. "Tasting Bubbling Naturecultures and Touching M/other’s Hands : Aesthesias of Microbial Touch Points." Thesis, Linnéuniversitetet, Institutionen för design (DE), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-96876.

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This project explores co-being and interdependencies between human and more-than-human, the microbes, through the medium of fermentation and the (hidden) communities this practice embodies. Therewith not only resisting commodification and alienation from our food but facing our very own identity, and the human-made construct of human exceptionalism and detachment of nature and culture. The cells in ’our’ human body are outnumbered by the cells of other microorganisms. They even actively influence many of the bodily functions associated with the concept of ’self‘ (our brain, immune system and g

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25

Mukhopadhyay, Achira. "Bioconversion of paper mill lignocellulosic materials to lactic acid using cellulase enzyme complex and microbial cultures." Thesis, Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/2332.

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26

Conway, Crystal A. "Study of Secondary Metabolite Gene Expression in Marine Microbial Co-Cultures Using Quantitative Real-Time PCR." NSUWorks, 2010. http://nsuworks.nova.edu/occ_stuetd/222.

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Interactions among microbial organisms often cannot be observed directly, but they can be inferred genetically using new molecular techniques. The analysis of secondary metabolite gene expression produced by co-cultured marine microbial species allows us to see how these organisms interact with one another when kept in the same environment. Co-cultures of three different strains of marine bacteria, P. aeruginosa PAO1, Roseobacter denitrificans OCH114, and Salinispora arenicola CNS-205 were grown in a laboratory setting, and using the Real-Time qPCR method gene expression levels of two differen

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27

Munns, Craig Christopher Robert. "Development of physio-chemical pretreatments and mixed microbial cultures for the conversion of lignocellulosic biomass to useful products." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28768.

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There is increasing interest in producing biofuels; biofuels are preferable to fossil fuels as the biomass from which they are derived is seen as a renewable source, as opposed to fossil fuels which are a finite resource. “First Generation” biofuels are derived from food crops such as grains and sugar cane. The use of food crops is not sustainable in this age of increasing food insecurity. A promising alternative appears to be what is termed “Second Generation” feedstocks, such as energy crops like Miscanthus spp., and agricultural by-products. The problem with the use of second generation fee

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28

Lee, Jungeun. "Sustainable Production of Microbial Lipids from Renewable Biomass: Evaluation of Oleaginous Yeast Cultures for High Yield and Productivity." Diss., Kansas State University, 2017. http://hdl.handle.net/2097/35300.

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Doctor of Philosophy<br>Department of Grain Science and Industry<br>Praveen V. Vadlani<br>Microbial lipids derived from oleaginous yeasts are a promising alternative source of edible oils due to the following advantages: no requirement of broad lands; availability of year-round production; and no food versus fuels controversy. Oleaginous yeast has an inherent ability to accumulate lipids inside cells and their lipids are preferable as starting materials in oleo-chemical industries because of their distinct fatty acid composition. Lignocellulosic biomass is a promising substrate to supply carbo

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Cavaille, Laetitia. "Production de Polyhydroxybutyrates à partir d'acides gras volatils en culture ouverte : influence du degré de limitation en phosphore sur les réponses cinétiques et les sélections microbiennes." Thesis, Toulouse, INSA, 2015. http://www.theses.fr/2015ISAT0049/document.

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La production de biopolymères de type polyhydroxyalkanoates (PHA) est une alternative attractive pour remplacer, en partie, les plastiques produits à partir de ressources fossiles. Les contraintes techniques imposées par les cultures pures (substrat purifié, stérilité…) impliquent un coût de production qui rend la production de ces bioplastiques difficilement compétitive par rapport à celle des plastiques conventionnels. L’utilisation de cultures non axéniques permettrait de palier les contraintes des cultures pures mais nécessite une étape de sélection des microorganismes producteurs naturels

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Wullschleger, Stephan Markus. "Biodiversity and microbial safety of artisanal Malian sour milk "fènè" and development of adapted starter cultures for controlled production /." [S.l.] : [s.n.], 2009. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18287.

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31

Pinheiro, Dutra Rulli Mayra. "Changes in nutrient levels influence freshwater microbial communities and their potential for chitin degradation." Thesis, Uppsala universitet, Institutionen för ekologi och genetik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-353835.

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Microorganisms are of great importance for the large scale elemental cycles and overallfunctioning of most natural ecosystems, and this also includes the ecology and maintenance offreshwater resources. Anthropogenic actions as well as climate change has greatly affectedfreshwaters and it is therefore important to understand how microorganisms react to suchenvironmental changes. I investigated how one such pressure, increased nutrient levels,influenced freshwater microbial communities and their potential to degrade the globallyabundant biopolymer chitin. To assess the effects of changed nutrien

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32

Ortmanis, Andris. "The development of a microcomputer controlled variable pathlength turbidimeter /." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65460.

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33

Schmitz, Simone Verfasser], Miriam [Akademischer Betreuer] Agler-Rosenbaum, and Lars Mathias [Akademischer Betreuer] [Blank. "Mediated electron transfer in defined microbial co-cultures for bioelectrochemical system application / Simone Schmitz ; Miriam Agler-Rosenbaum, Lars Mathias Blank." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1190360837/34.

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Poplawski, Cezary. "Development of a high-throughput technique for screening Archaeal tetraether lipid cores and other alcohols in sediments and microbial cultures." Thesis, University of York, 2017. http://etheses.whiterose.ac.uk/18948/.

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A mild and effective protocol for the derivatisation of Archaeal tetraether lipid cores and other alcohols from cultured and sedimentary material has been developed using N-protected amino acids. The derivatives were prepared in excellent to near quantitative yields in approx. 2 h. The N-Boc and N-Fmoc derivatives exhibit very good chromatographic properties and considerable signal intensity improvement, in MS, of up to two orders of magnitude, relative to the native species. The fluorescence properties of the derivatives containing a strong chromophore (Fmoc), showed excellent detector respon

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Schmitz, Simone [Verfasser], Miriam Akademischer Betreuer] Agler-Rosenbaum, and Lars Mathias [Akademischer Betreuer] [Blank. "Mediated electron transfer in defined microbial co-cultures for bioelectrochemical system application / Simone Schmitz ; Miriam Agler-Rosenbaum, Lars Mathias Blank." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1190360837/34.

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Copp, Clinton W. "Production and Degradation of 4-Ethylphenol in LACTOBACILLUS SP. pep8 Cultures and in Blended Swine Lagoon Enrichments." TopSCHOLAR®, 2012. http://digitalcommons.wku.edu/theses/1189.

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4-Ethylphenol (4-EP) is a malodorant of swine waste and is derived from a component of lignin called p-coumaric acid (p-CA). The production of 4-EP from lignin in swine waste is untested. Additionally, the effect of Fe (III) on 4-EP levels is unknown. Four experiments were performed to determine if Lactobacillus sp. pep8 cultures, as well as enriched swine lagoon slurries, could liberate p-CA from lignin and convert p-CA to 4-EP. Furthermore, it was tested if the addition of Fe (III) influences the conversion of p- CA to 4-EP. Experiment 1 tested Lactobacillus sp. pep8 cultures to determine if

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Pedras, Maria Inês Machado. "Investigation of the regulation mechanisms for bioplastics production from industrial residues." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/10863.

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Dissertação para obtenção do Grau de Mestre em Biotecnologia<br>The current high demand for plastics has become unsustainable. Polyhydroxyalkanoates are biopolymers stored by bacteria that can potentially replace modern plastics due to: wide range of applications; biodegradability; use of renewable resources as feedstock. High costs of current Polyhydroxyalkanoates production can be reduced using mixed cultures of organisms. Activated sludge from wastewater treatment plants is selected for Polyhydroxyalkanoates production through the imposition of cycles of intermittent feeding. In this stud

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Roy, Alexandra-Sophie [Verfasser]. "Response of Thalassiosira oceanica and natural microbial communities to ocean acidification : a meta-omics comparison from unialgal cultures to mesocosms / Alexandra-Sophie Roy." Kiel : Universitätsbibliothek Kiel, 2017. http://d-nb.info/1138979929/34.

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Rafrafi, Yan. "Impact des facteurs biotiques sur le réseau métabolique des écosystèmes producteurs d’hydrogène par voie fermentaire en culture mixte." Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20249/document.

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De nos jours, les cultures mixtes sont considérées comme une sérieuse alternative aux cultures pures pour les procédés de biotechnologie. En effet, les cultures mixtes peuvent fonctionner en réacteur continu, dans des conditions non-stériles et traiter une grande variété de substrats organiques. La principale restriction de l'utilisation de ces bioprocédés en cultures mixtes réside dans leur instabilité liée à la présence de voies métaboliques non désirées résultant d'interactions microbiennes complexes. Notamment, le rôle des bactéries de faible abondance reste à être élucidé. Ce travail a do

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Thantsha, Mapitsi Silvester. "Cell immobilization techniques for the preservation of probiotics." Thesis, Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-01282008-105551.

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Schebor, Hayley A. "Ammonia-oxidizing bacteria and archaea across a freshwater trophic gradient." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1407092663.

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42

Pierra, Mélanie. "Couplage de la fermentation sombre et de l’électrolyse microbienne pour la production d’hydrogène : formation et maintenance du biofilm électro-actif." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20150/document.

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L'hydrogène, qui constitue une solution alternative et durable à l’usage d’énergies fossiles, est produit essentiellement par reformage de combustibles fossiles (95%). Des filières de production plus soucieuses de l'environnement sont envisagées. Deux familles de technologies sont explorées: 1) par décomposition thermochimique ou électrochimique de l'eau et 2) à partir de différentes sources de biomasse. Parmi celles-ci, les cellules d'électrolyse microbienne ou «Microbial electrolysis cell (MEC)» permettent de produire de l'hydrogène par électrolyse de la matière organique. Une MEC consiste e

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Mehmood, Nasir. "Effets de l'hydrodynamique et du transfert d'oxygène sur la physiologie de Streptomyces pristinaespiralis lors de cultures en flacons agités." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL016N/document.

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Dans le cadre de ce travail de thèse, la physiologie apparente de Streptomyces pristinaespiralis et plus spécifiquement la production de pristinamycines (déclenchement et concentration) a été reliée à son environnement hydrodynamique. Des cultures de S. pristinaespiralis ont été réalisées sous diverses conditions d'agitation et d'aération, en fioles lisses d’Erlenmeyer. Ces conditions engendrent des dissipations volumiques comprises entre 0,55 et 14 kW.m-3 et des kLa compris entre 30 et 490 h-1. Partant du constat de la complexité combinée de l’hydrodynamique rencontrée dans les bioréacteurs e

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Chagas, Fernanda Oliveira das. "Utilização de culturas mistas como estratégia para estimular a biossíntese de produtos naturais por fungos endofíticos." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/60/60138/tde-15032010-125530/.

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O estudo das interações planta-microrganismos tem sido de grande interesse ao longo dos últimos anos. Atualmente, as interações que ocorrem entre microrganismos que vivem em estreita relação também vêm merecendo grande atenção, pois forças competitivas e mutualísticas podem induzir a produção de novos metabólitos bioativos. Portanto, estudar interações existentes entre os microrganismos endofíticos que colonizam uma mesma planta parece ser uma estratégia promissora para a obtenção de substâncias quimicamente diferentes, eventualmente bioativas. Através da utilização de culturas mistas de micro

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Benešovská, Veronika. "Analýza vlivu trénovací datové sady na úspěšnost segmentace." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442485.

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Microbial structures are present in every living organism, so it is important to classify them for subsequent research of their origin and function. Bruker, s.r.o is developing the MBT Pathfinder for this purpose, which automates the transfer of colonies to MALDI plates, where the subsequent analysis of the sample takes place. Transferred colonies can be selected manually or using an algorithm that ensures automatic colony segmentation. This algorithm must be learned on a training set, which has huge influence on its accuracy. This work deals with measuring the influence of a dataset on the ac

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Giliberti, Gianluca. "Development of a pilot scale process for polyhydroxyalkanoates production from food waste." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The focus of this thesis was on investigation of culture selection step for PHA production by using food waste as no-cost feedstock with mixed microbial cultures (MMC). PHAs (polyhydroxyalkanoates) are biologically synthesized polymers that can be produced from renewable resources and are completely biodegradable. Because at the present times the demand of alternatives to replace conventional plastics is rapidly growing due to environmental issues, the possibility to produce PHAs on a large scale by using waste materials as carbon source is considered to be very attractive both from an environ

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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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Oueslati, Nadia. "Conception et optimisation d'un procédé extrapolable de purification d'acides hyaluroniques produits par culture microbienne." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0191/document.

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L’acide hyaluronique (AH) est un polymère osidique aux propriétés mécaniques et biologiques d’intérêt pour le secteur de la santé et des cosmétiques. L’AH est produit à l’échelle industrielle par mise en oeuvre de souches de streptocoques groupe C et D. A l’issue de la production, une part de l’AH est libre dans le milieu de culture complexe, l’autre est associée à la capsule des cellules. La purification de l’AH est délicate en raison, d’une part, de la complexité des milieux de production et, d’autre part, des exigences de la pharmacopée européenne. L’objectif de cette thèse a été de propose

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Le, Digabel Yoann. "Etude de la diversité bactérienne et génétique dans des cultures dégradant l'ETBE ou le MTBE." Phd thesis, Ecole Centrale de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00966858.

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L'éthyl tert-butyl éther (ETBE) et le méthyl tert-butyl éther (MTBE) sont des éthers carburants utilisés comme additifs dans les essences sans plomb. Du fait de leur utilisation massive, de nombreux cas de pollutions d'aquifères ont été répertoriés, en particulier pour le MTBE, et ces composés représentent donc un risque sanitaire potentiel. Des travaux récents ont permis de mettre en évidence différents micro-organismes capables de dégrader ces composés malgré leur faible biodégradabilité dans l'environnement. Néanmoins, une meilleure compréhension de l'écologie et de la régulation de ces cap

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Fahimi, Noura. "Étude des interactions entre bactéries lactiques œnologiques Œnococcus œni. Analyses cinétiques et modélisation." Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0008/document.

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La Fermentation Malo-Lactique (FML) réalisée par OEnococcus oeni est une étape importante de la vinification qui doit être maîtrisée. Bien que les vinificateurs aient à leur disposition des souches OE. oeni selectionnees la FML n’est pas toujours réussie. Les conditions physico-chimiques (pH, éthanol, température), la composition du vin et les facteurs biologiques influencent l’activite de cette bacterie ; parmi ces dernières les interactions entre micro-organismes sont primordiales. Souvent, après la fermentation alcoolique par la levure, des souches indigenes d’OE. oeni sont naturellement pr

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