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Dissertations / Theses on the topic 'Rhamnolipds'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Oliveira, Ana Carmen dos Santos Mendes de. "Recupera??o e purifica??o de ramnolip?deos produzidos por pseudomonas aeruginosa P029-GVIIA utilizando mela?o de cana como substrato." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15908.

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Made available in DSpace on 2014-12-17T15:01:52Z (GMT). No. of bitstreams: 1 AnaCSMO_TESE.pdf: 4366304 bytes, checksum: 034491089a42b2a0e2af84a9b17e3da3 (MD5) Previous issue date: 2010-12-29<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Biosurfactants are molecules produced by microorganisms mainly bacteria as Pseudomonas and Bacillus. Among the biosurfactants, rhamnolipids play an important role due to their tensoactive as well as emulsifying properties. Besides can be produced in a well consolidated way the production costs of biosurfactants are quite expansive mainly i

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2

Desai, Prerak T. "Antimicrobial Properties of Syringopeptin 25A and Rhamnolipids." DigitalCommons@USU, 2006. https://digitalcommons.usu.edu/etd/5526.

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The increasing bacterial resistance to available antibiotics requires the search for new antibacterial compounds to be broadened. This study investigated the antimicrobial properties of two secondary metabolites from fluorescent pseudo monads -- syringopeptin 25A, a lipodepsipeptide produced by Pseudomonas syringae pv. syringae, and a rhamnolipid mixture produced by Pseudomonas aeruginosa. The rate of antimicrobial action was determined by monitoring the rate of uptake of propidium iodide during exposure to the compounds. Inhibition was also confirmed by the microbroth dilution method to deter

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3

Kratochvílová, Olga. "Produkce a charakterizace biosurfaktantů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2018. http://www.nusl.cz/ntk/nusl-376852.

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This diploma thesis deals with the microbial production of biosurfactants of selected bacterial strains. In order to test the biosurfactant production ability, screening methods were chosen to be able to review the potential of the selected strains to produce biosurfactants. With the scope of the work, 11 bacterial strains, which are used as polyhydroxyalkanoate (PHA) producers, have been tested. The ability to produce biosurfactants was tested in all strains both in complex inoculation and mineral production media. The presence of biosurfactants in Pseudomonas putida was detected on the basis

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4

Chen, Chun Chiang. "Rhamnolipid Production with Denitrifying Pseudomonas Aeruginosa." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1236689824.

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5

Heyd, Miriam. "Continuous production of rhamnolipids by means of process integration." [S.l. : s.n.], 2009. http://digbib.ubka.uni-karlsruhe.de/volltexte/1000010438.

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6

Invally, Krutika Ravi. "Process optimization for rhamnolipids production and their environmental impacts." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1541755267451868.

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7

Lebron-Paler, Ariel. "Solution and Interfacial Characterization of Rhamnolipid Biosurfactant from P.aeruginosa ATCC 9027." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/193778.

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Rhamnolipid biosurfactants are investigated to determine their role in biological processes, and for discovery of novel, more biocompatible applications in areas related to medicine, agriculture, and environment. Fundamental understanding of the physical and chemical properties of rhamnolipids is needed. Thus, systematic studies on solution and interfacial properties on rhamnolipids from P.aeruginosa ATCC 9027 were undertaken. A purification protocol was developed and a thorough qualitative and quantitative speciation analysis was performed with high performance liquid chromatography-mass spec

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8

Jandrtová, Sabina. "Stabilizace pivní pěny pomocí biosurfaktantů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2019. http://www.nusl.cz/ntk/nusl-401941.

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This diploma thesis focuses on a research of the foam stability of the beer. We specifically observed the influence of ethanol and surface tension on the foam stability, and influence of ethanol and surface tension on the height of the foam. It was observed the influence of the hop acids in non-alcoholic beers. Furthermore, different biosurfactants were added into to the beer to observe better stability of the foam. The theoretical part of this work describes the foam from the physical aspect. There are described fourth key events involved in foam formation. Then it focuses on the beer foam –

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9

Lim, Yin Choy 1975. "Production of rhamnolipids by Pseudomonas aeruginosa using self-cycling fermentation (SCF)." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33334.

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Rhamnolipids are surfactants produced by microorganisms. They can lower the surface tension of water to below 30 mN/m. They are of interest to industry because of their low toxicity and biodegradability. They find various applications in food and beverages, cosmetics, and pharmaceutical industries.<br>Rhamnolipids were produced by Pseudomonas aeruginosa ATCC 9027 using self-cycling fermentation (SCF). The application of this technique led to reproducible but unusual growth patterns. A unique method was adopted to control the SCF. All of the SCF experiments were carried out with a pH control wh

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10

Price, Bianca Louise. "Characterisation of rhamnolipid biosynthesis in Pseudomonas aeruginosa PA01." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609565.

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11

Ochsner, Urs Arnold. "Genetics and biochemistry of Pseudomonas aeruginosa rhamnolipid biosurfactant synthesis /." [S.l.] : [s.n.], 1993. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10401.

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12

Saffiedine, Brahim. "Contribution à l'étude du système BAC "Biofilm Associated Cluster" chez Pseudomanas aeruginosa." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMR018/document.

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Pseudomonas aeruginosa (PA) est une bactérie Gram négatif, pathogène opportuniste, impliquée dans un grand nombre d’infections nosocomiales. Cette bactérie est aussi le principal micro-organisme responsable des surinfections broncho-pulmonaires chez les patients atteints de mucoviscidose. Cette prééminence est due en partie à la capacité de PA à former des biofilms, ce qui lui confèrent une résistance exceptionnelle aux antimicrobiens. Au sein de notre laboratoire, une analyse protéomique différentielle a permis de démontrer, en 2004, l’existence d’un protéome spécifique lorsque la bactérie se

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13

Touchard, Matthieu. "Caractérisation de la perception racinaire et de la résistance systémique induite par les rhamnolipides et leurs précurseurs chez Arabidopsis thaliana." Thesis, Reims, 2019. http://www.theses.fr/2019REIMS018/document.

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Dans leur environnement, les plantes sont fréquemment soumises à des attaques de microorganismes pathogènes. Pour leur faire face, elles mettent en place des mécanismes de défense activés suite à la détection du microorganisme via des motifs moléculaires ou IPs (Invasion Patterns). Les rhamnolipides (RLs) sont des molécules glycolipidiques amphiphiles produites par des bactéries des genres Pseudomonas et Burkholderia. Ces molécules sont capables d’induire, au niveau foliaire chez différentes plantes, une résistance locale contre des microorganismes phytopathogènes. L’acide 3-hydroxydécanoïque

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14

Bensaci, Mekki F. "The Bioactive Properties of Syringomycin E-Rhamnolipid Mixtures and Syringopeptins." DigitalCommons@USU, 2009. https://digitalcommons.usu.edu/etd/247.

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The need for new antimicrobial agents has become important in the last decade due to emerging resistance to a number of conventional antimicrobial agents. New approaches and sources are needed to generate novel and effective antimicrobials. For example, synergistic combinations between two or more agents may lead to new antimicrobial therapies. Furthermore, the increase in health problems caused by the exposure to agricultural crop pesticides and synthetic fungicides and the emerging development of organic farming has increased the necessity to develop natural products than can be used safel

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15

Rudden, Michelle. "Optimisation of rhamnolipid production in pseudomonas aeruginosa: a molecular approach." Thesis, Ulster University, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.650312.

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Pseudomonas aeruginosa synthesises heterogeneous mixtures of mono and di-rhamnolipid (RL) biosurfactants. The complex genetic and metabolic regulation surrounding RL biosynthesis is one of the major hurdles for the large scale production of these metabolites. To date there is still a lack of quantitative understanding of the interaction between the metabolic and regulatory networks governing RL biosynthesis in P. aeruginosa. The initial part of the thesis details the first systematic validation of reference gene stability under nutrient limiting conditions for the development of a reliable and

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16

Eismin, Ryan J., and Ryan J. Eismin. "Surface, Aggregation, and Phase Characterization of Microbially-Produced & Chemically-Synthesized Monorhamnolipids." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/623026.

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The purpose of this research has been to explore the native monorhamnolipid (mRL) mixture produced by Pseudomonas aeruginosa ATCC 9027, as well as newly- synthesized monorhamnolipid diastereomers (R,R)-Rha-C10-C10, (R,S)-Rha-C10-C10, (S,S)-Rha-C10-C10 and (S,R)-Rha-C10-C10, to understand their aggregation and phase behavior in aqueous solution. This work is in response to the consideration that biosurfactants offer a "greener" alternative to conventional surfactants. Relationships between chemical structure of the diastereomers and surface activity were studied using surface tension measuremen

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17

Heyd, Miriam [Verfasser], and M. [Akademischer Betreuer] Franzreb. "Continuous production of rhamnolipids by means of process integration / Miriam Heyd. Betreuer: M. Franzreb." Karlsruhe : KIT-Bibliothek, 2009. http://d-nb.info/101369578X/34.

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18

Bukavaz, Şebnem [Verfasser]. "The effect of rhamnolipid production on Pseudomonas aeruginosa physiology / Sebnem Bukavaz." Ulm : Universität Ulm, 2016. http://d-nb.info/1102249947/34.

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19

Zhang, Yimin. "Role of Pseudomonas rhamnolipid surfactants in biodegradation of slightly soluble hydrocarbons." Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187280.

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Biodegradation of hydrocarbons is often limited by the low water solubility. Surfactants can increase hydrocarbon solubility, however, the effects of surfactants on hydrocarbon biodegradation are not well known. Therefore, the purpose of this research is to investigate the fundamental interactions between surfactants, hydrocarbons and microorganisms. This three-way interaction was studied in the defined experimental system consisting of Pseudomonas rhamnolipid surfactants, hydrocarbons and Pseudomonas hydrocarbon degraders. A variety of system factors affecting biodegradation were examined. Th

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20

Wang, Hui. "Interfacial and Solution Characterization of Rhamnolipid Biosurfactants and their Synthetic Analogues." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/217062.

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Rhamnolipid (RL) biosurfactants have been considered "green" alternatives to synthetic surfactants. Here, systematic studies of monorhamnolipids (mRLs) and their synthetic analogues are performed to characterize their interfacial and solution behaviors as surfactants. Chemical structure-surface activity relationships of rhamnolipids were probed using surface tension measurements on RLs and a series of their synthetic analogues designed by "truncation modification." Based on our study on RLs and the rationally-designed RL analogues, the key structural factor responsible for the excellent surfac

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21

Ahmed, Syed A. K. Shifat. "Quorum sensing mediated adaptability, pathogenicity and rhamnolipid production in Pseudomonas aeruginosa." Thesis, Ulster University, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744761.

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Quorum sensing (QS) acts as an important communication wiring in Pseudomonas aeruginosa. The bacteria use the system to regulate production of autoinducers for several adaptation and survival advantages. The system controls the production of key factors like proteases and rhamnolipid. Due to the substantial genome size and plasticity of P. aeruginosa, other factors are increasingly being linked with QS calling for the need of a better understanding of this complex system. The initial part of the thesis acknowledges the QS adaptation in P. aeruginosa clinical isolates from Cystic Fibrosis (CF)

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22

Beal, Richard Kenneth. "Mechanisms of (bio)surfactant enhanced alkane biodegradation." Thesis, University of York, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313856.

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23

Magario, Ivana. "Enzyme reaction engineering for the conversion of emulsified di-rhamnolipid by free and immobilized Naringinase." Karlsruhe Univ.-Verl. Karlsruhe, 2008. http://d-nb.info/992868114/04.

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24

Rahim, Rahim. "Biosynthesis of L-rhamnose and its incorporation into the lipopolysaccharides and rhamnolipids of Pseudomonas aeruginosa." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0019/MQ55706.pdf.

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25

Sodagari, Maysam. "Optimization of Production and Recovery of Rhamnolipids and Study of Their Effect on Bacterial Attachment." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1385081228.

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26

Hörmann, Barbara [Verfasser], and C. [Akademischer Betreuer] Syldatk. "Herstellung mikrobieller Rhamnolipide mit nicht-pathogenen Stämmen / Barbara Hörmann. Betreuer: C. Syldatk." Karlsruhe : KIT-Bibliothek, 2012. http://d-nb.info/1029320640/34.

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27

Zhang, Lin. "Effects of Fatty Acid Substrates on Rhamnolipid (Biosurfactant) Biosynthesis and Congener Distribution." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/203031.

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Rhamnolipids are surface-active molecules produced by Pseudomonas aeruginosa as congener mixtures. They are considered “green” alternatives to synthetic surfactants used in many applications. Optimizing yield and controlling congener distribution are necessary steps for successful commercialization. Studies have noted that vegetable oils, composed of a mixture of fatty acids, increase rhamnolipid yield. The physiological explanation for this is not yet understood. Furthermore the exact effects of various fatty acid components in the oils on rhamnolipid production have not been reported. The fi

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28

Anić, Iva [Verfasser]. "Development of a foam adsorption method for the fermentative production and recovery of rhamnolipids / Iva Anić." München : Verlag Dr. Hut, 2019. http://d-nb.info/1194289053/34.

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29

Lovaglio, Roberta Barros [UNESP]. "Produção de ramnolipídios por mutantes de Pseudomonas aeruginosa LBI." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/103960.

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Made available in DSpace on 2014-06-11T19:32:55Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-07-19Bitstream added on 2014-06-13T20:24:23Z : No. of bitstreams: 1 lovaglio_rb_dr_rcla.pdf: 1731223 bytes, checksum: 43dfc85c18edb74e4fc520e7b8f963ac (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Os biossurfactantes são metabólitos secundários que apresentam atividade de superfície, podendo ser aplicados em diferentes processos industriais, como produção de fármacos, compostos químicos, cosméticos, biorremediação de ambientes poluídos por petróleo e derivados e

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30

Pinzon-Gamez, Neissa M. "Rhamnolipid Biosurfactant Production from Glycerol: New Methods of Analysis and Improved Denitrifying Fermentation." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1257791610.

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31

Soltani, Dashtbozorg Soroosh. "Microbial Rhamnolipids as Environmentally Friendly Biopesticides: Congener Composition Produced, Adsorption in Soil, and Effects on Phytophthora sojae." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1438175115.

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32

Schmidberger, Anke [Verfasser], and U. [Akademischer Betreuer] Obst. "Molecular Characterisation of Cultivation Processes - Stress-induced Rhamnolipid Production / Anke Schmidberger. Betreuer: U. Obst." Karlsruhe : KIT-Bibliothek, 2014. http://d-nb.info/1063027489/34.

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33

Ochoa, Loza Francisco Javier 1956. "Physico-chemical factors affecting rhamnolipid (biosurfactant) application for removal of metal contaminants from soil." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282826.

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Contamination of soil and groundwater environments by toxic metals and organic compounds is of major concern because of the potential health hazard posed for humans. Remediation of such sites may require the addition of chemical agents that help in the mobilization of contaminants which are likely to be bound to solid surfaces. Surfactants are one of the agents proposed for addition to enhance the removal of soil-bound contaminants. In this dissertation, a series of laboratory experiments were conducted to investigate constraints to the potential application of a microbially produced surfactan

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34

Sandrin, Todd Ryan. "Naphthalene biodegradation in a cadmium cocontaminated system: Effects of rhamnolipid, pH, and divalent cations." Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/289199.

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Forty percent of hazardous waste sites on the U.S. Environmental Protection Agency's National Priority List (NPL) are cocontaminated with organic and metal pollutants. Conventional approaches to remediating these sites are costly and often ineffective. Bioremediation is a promising, cost-effective alternative but metal toxicity at cocontaminated sites may limit its efficacy. The research described in this dissertation provides two new possible approaches to enhance the bioremediation of cocontaminated environments and sheds light on the relationship between metal concentration and inhibition o

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35

Beuker, Janina [Verfasser]. "Evaluation of process designs for heterologous rhamnolipid production by Pseudomonas putida KT2440 / Janina Beuker." München : Verlag Dr. Hut, 2017. http://d-nb.info/1149579552/34.

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36

Leitermann, Frank. "Entwicklung und Optimierung eines biotechnologischen Prozesses zur Herstellung mikrobieller Rhamnolipide auf Basis nachwachsender Rohstoffe." Karlsruhe Univ.-Verl. Karlsruhe, 2008. http://d-nb.info/990695794/04.

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37

Tiso, Till [Verfasser], Lars Mathias [Akademischer Betreuer] Blank, and Rolf [Akademischer Betreuer] Wichmann. "Accessing natural diversity of rhamnolipids by metabolic engineering of Pseudomonas putida / Till Tiso ; Lars Mathias Blank, Rolf Wichmann." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1129875954/34.

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38

Xia, Qing. "Online Monitoring of Aerobic Denitrification of Pseudomonas Aeruginosa by NAD(P)H Fluorescence." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1133811484.

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39

Chen, Fan. "Metabolism of Pseudomonas Aeruginosa Under Simultaneous Aerobic Respiration and Denitrification." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1133809898.

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40

Hogan, David E., and David E. Hogan. "Biosurfactant (Monorhamnolipid) Complexation of Metals and Applications for Aqueous Metalliferous Waste Remediation." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/623071.

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Biosurfactants are compounds that exhibit surface activity (e.g., reduce surface and interfacial tension) and are derived from natural, biological sources. They are considered green substances due to their natural derivation, biodegradability, and relatively low toxicity. Biosurfactants from multiple classes have been shown to interact with metals, and a review of these interactions is provided. Rhamnolipids produced by Pseudomonas aeruginosa are attracting attention for metal remediation applications. The purpose of this dissertation is to evaluate rhamnolipids' ability to complex rare earth

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41

Liu, Guansheng, Hua Zhong, Yongbing Jiang, et al. "Effect of low-concentration rhamnolipid biosurfactant on P seudomonas aeruginosa transport in natural porous media." AMER GEOPHYSICAL UNION, 2017. http://hdl.handle.net/10150/623109.

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Enhanced transport of microbes in subsurface is a focus in bioaugmentation applications for remediation of groundwater. In this study, the effect of low-concentration monorhamnolipid biosurfactant on transport of Pseudomonas aeruginosa ATCC 9027 in natural porous media (silica sand and a sandy soil) with or without hexadecane as the nonaqueous phase liquids (NAPLs) was studied with miscible-displacement experiments using artificial groundwater as the background solution. Transport of two types of cells was investigated, glucose-grown and hexadecane-grown cells with lower and higher cell surfac

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42

Nasser, Fatima. "Conversion of toxic hexavalent chromium to trivalent chromium by rhamnolipid stabilized zero valent iron nanoparticles." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk/4347/.

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Zero valent iron nanoparticles (nZVI) are being used in environmental remediation of contaminants due to their reducing properties. Toxic chemicals such as hexavalent chromium (Cr(VI)) are released into environmental waters from industrial effluent and are capable of triggering life threatening diseases in humans. Solution phase Cr(VI) has can be converted to less harmful trivalent chromium (Cr(III)) using nZVI, which decreases the oxidation state. Cr(III) binds to iron and can be removed, thereby decreasing the concentration of solution phase Cr(VI). The nZVI have a high specific surface area

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Moura, Cinthia Cristine de. "Green stabilization of nanoscale zero-valent iron (nZVI) with rhamnolipids produced by agro-industrial waste : application on nitrate reduction /." Rio Claro, 2019. http://hdl.handle.net/11449/190850.

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Orientador: Jonas Contiero<br>Resumo: A contaminação ambiental causada por compostos orgânicos é um importante problema que afeta solos e água superficiais. Para reduzir ou remover esses poluentes, os locais contaminados são geralmente tratados com métodos físicos e químicos. No entanto, a maioria dessas técnicas de remediação é custosa e geralmente leva à remoção incompleta e à produção de resíduos secundários. A nanotecnologia consiste na produção e aplicação de estruturas extremamente pequenas, cujas dimensões estão na faixa de 1 a 100 nm, neste cenário a nanopartícula de ferro zero valente

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Feng, Wanhua. "A study of rhamnolipid microbubble dispersion for bioremediation applications : dispersion properties and bacteria/surfactant/contaminant interactions." Thesis, University of Auckland, 2011. http://hdl.handle.net/2292/6871.

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This thesis presents a study on the production of microbubble dispersions from rhamnolipid biosurfactant and the mechanism and factors that impact upon the effectiveness of the dispersion for improving bioremediation efficiency, with a specific focus on the use of microbubble dispersion as a carrier for contaminant-degrading bacteria within a bioremediation scenario. Microbubble dispersion is a suspension of a large number of minute spherical gas bubbles encapsulated in a soapy liquid film in an aqueous surfactant solution. Microbubble dispersion has promising potential for enhancing in

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Müller, Markus Michael [Verfasser], and C. [Akademischer Betreuer] Syldatk. "Optimization and characterization of microbial rhamnolipid production from renewable resources / Markus Michael Müller. Betreuer: C. Syldatk." Karlsruhe : KIT-Bibliothek, 2011. http://d-nb.info/1015993702/34.

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Peixoto, Renata de Melo. "Bioprospecção de microorganismos do gênero Pseudomonas produtores de biossurfactantes." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/42/42132/tde-31032009-092533/.

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Surfactantes de origem química e biológica são substâncias anfipáticas que se localizam em interfaces e diminuem a tensão intererficial. Este trabalho objetivou isolar microrganismos do gênero Pseudomonas, a partir de amostras ambientais; selecionar, dentre os isolados, aqueles que são capazes de produzir biossurfactante e caracterizar os biossurfactantes encontrados de acordo com suas propriedades. Foram isoladas 1713 linhagens, destas, 944 foram capazes de crescer em meio PIA. A análise do sobrenadante para presença de ácidos graxos normalmente encontrados em ramnolipídios demonstrou que em

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47

Gomes, Milene Zezzi do Valle. "Utilização de biosurfatantes no controle da adesão bacteriana e na remoção de biofilmes de patógenos alimentares em superfície de poliestireno." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/75/75132/tde-18102011-164110/.

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Na natureza, os microorganismos podem apresentar forma de vida planctônica ou podem estar aderidos a superfícies formando comunidades conhecidas como biofilmes. A formação de biofilmes na indústria alimentícia é uma constante preocupação visto que os microorganismos aderidos podem causar contaminações persistentes, levando a deterioração do alimento e a transmissão de doenças. Uma alternativa para evitar a adesão bacteriana e a formação de biofilmes é o pré-condicionamento de superfícies com biosurfatantes, que são compostos tensoativos de origem microbiana capazes de alterar as propriedades

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Lovaglio, Roberta Barros. "Produção de ramnolipídios por mutantes de Pseudomonas aeruginosa LBI /." Rio Claro : [s.n.], 2011. http://hdl.handle.net/11449/103960.

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Orientador: Jonas Contiero<br>Banca: Henrique Ferreira<br>Banca: Francisco José dos Santos<br>Banca: José Gregório Cabrera Gomez<br>Banca: Humberto Marcio Santos Milagre<br>Resumo: Os biossurfactantes são metabólitos secundários que apresentam atividade de superfície, podendo ser aplicados em diferentes processos industriais, como produção de fármacos, compostos químicos, cosméticos, biorremediação de ambientes poluídos por petróleo e derivados e recuperação terciária do petróleo. A maior vantagem destes compostos quando comparado aos surfactantes sintéticos reside na sua diversidade estrutura

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Sousa, Juliana Rabelo de. "ProduÃÃo de biossurfactantes a partir da glicerina obtida da produÃÃo de biodiesel." Universidade Federal do CearÃ, 2008. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=4635.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>O objetivo deste trabalho foi avaliar a glicerina resultante da transesterificaÃÃo do Ãleo de mamona como fonte de carbono e nutrientes para P. aeruginosa LAMI. O efeito da concentraÃÃo de nutrientes e de condiÃÃes ambientais foi avaliado de acordo com dois planejamentos fatoriais completos sobre o crescimento celular, produÃÃo de biossurfactante e propriedades tensoativas do surfactante produzido. A anÃlise estatÃstica dos dados foi realizada pelo software Statistica 6.0. Avaliou-se o efeito da concentraÃÃo de glicerina e de nit

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Bazire, Alexis. "Influence de l'environnement et des communications inter-bactériennes sur la production de biosurfactants par Pseudomonas Aeruginosa." Lorient, 2005. http://www.theses.fr/2005LORIS058.

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La bioremèdiation, qui utilise la capacité naturelle des micro-organismes à disperser et dégrader les hydrocarbures, est l'une des perspectives des plus attractives pour la décontamination des zones souillées par les marées noires. Pseudomonas aeruginosa produit des biosurfactants (dispersants) de type glycolipides nommés rhamnolipides, dont la régulation dépend d'un système relatif à la densité cellulaire, le quorum sensing (QS). Lors de cette étude, la hiérarchie du QS fut pour la première fois mise en évidence par des cinétiques de production des deux molécules signal : la N-(3-oxododecanoy

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