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Dissertations / Theses on the topic 'Biosurfactants'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Helle, Steve. "Biosurfactants & cellulose hydrolysis." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61308.

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The action of many antimicrobial agents is dependent on their ability to interact with biological membranes. A group of polypeptide antibiotics was found to have surface activite properties. One of them, gramicidinS, produced a minimum in the surface tension curve, which was attributed to instabilities in the intra-molecular hydrogen bonds. Biosurfactants were found to have a great effect on the two phase hydrolysis of cellulose by cellulase. Seven times as much sugar was produced by the hydrolysis of Sigmacell 100 when the biosurfactant sophorolipid was present. The surfactant affects the ads

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2

Ballot, Francis. "Bacterial production of antimicrobial biosurfactants." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2250.

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Thesis (MScEng (Process Engineering))--University of Stellenbosch, 2009.<br>Surfactants are compounds that reduce interfacial surface tension, resulting in detergency, emulsifying, foaming and dispersing properties. Surfactants produced via biochemical processes (biosurfactants) form a niche market with their low toxicity, biodegradability and high specificity attributes. Biosurfactants have recently received considerable attention owing to their potential as biomedical molecules. In this study a knowledge base was established for the development of a process which produces biosurfactants for

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3

Bamara, Prosper. "Conversion of hydrocarbons to biosurfactants : an insight into the bioprocess optimisation of biosurfactant production using alkanes as inducers." Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/5344.

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Surfactants are chemical compounds that are able to alter interfacial properties, particularly surface tension. When they are biologically produced, the term biosurfactant is used. One of the most important groups of biosurfactants is a family of chemical compounds known as glycolipids, whose structure consists of a sugar group and a lipid tail. Glycolipids are subdivided into three main groups: rhamnolipids, sophorolipids and trehalolipids, named following their sugar moieties, respectively rhamnose, trehalose and sophorose. Biosurfactants exhibit attractive advantages over chemical surfactan

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4

Ghobadi, Fomeshi Ahmadreza. "Toward an Equation of State for Biosurfactants." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1405344829.

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5

Lin, Ju. "Efficiency of biosurfactants applied by means of electrokinetics." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0018/NQ47709.pdf.

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6

Heinemann, Gijzen Christine. "Lactobacilli biosurfactants as anti-adhesion molecules against uropathogens." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0006/MQ42154.pdf.

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7

Drouin, Carole M. "Partition of biosurfactants in two-phase fermentation media." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61246.

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The partition of surfactants and of a biosurfactant-producing microorganism was studied in polyethylene glycol and dextran aqueous two-phase systems. In the presence of sodium phosphate, surfactants distributed themselves according to their charge. Cationic surfactants preferred the bottom phase, while anionic surfactants were attracted to the top phase. Increasing the phosphate molarity, the pH, the polymer concentration or molecular weight all resulted in a more one-sided surfactant partitioning. Biosurfactant partition was weaker than synthetic surfactant partition due to their weaker effec

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8

Bence, Keenan. "Bacterial production of antimicrobial biosurfactants by Bacillus subtilis." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17876.

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Thesis (MScEng)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: Biosurfactants are microbially produced molecules that show excellent surface-active properties. Bacillus subtilis ATCC 21332 produces the biosurfactant, surfactin, which exhibits antimicrobial activity against bacteria as well as fungi. Although antimicrobial activity has been exhibited by a number of bacterially produced biosurfactants, notably the rhamnolipid from the pathogen Pseudomonas aeruginosa, the GRAS status B. subtilis makes the use of this organism preferable for large scale bioprocesses. The objectives of

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9

McGinley, Susan. "Exploding Zoospores: Using Biosurfactants to Control Plant Pathogens." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1998. http://hdl.handle.net/10150/622309.

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10

Kılıç, Eylem, Gökhan Zengin, and Arife Candaş Adıgüzel Zengin. "Use of plant-derived biosurfactants in leather industry." Thesis, КНУТД, 2016. https://er.knutd.edu.ua/handle/123456789/4750.

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11

Perry, Lisa J. "Development of a process for the production of a bacterial surfactant." Thesis, University of Wolverhampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308158.

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By using standard isolation procedures 55 microbial isolates were successfully obtained from a number of oil-contaminated sources. These microbial isolates, along with a further 17 obtained from the University culture collection were screened for their ability to degrade hexadecane. Of these, all but two strains were able to utilise hexadecane as their sole carbon and energy source. One isolate, JP1, demonstrated outstanding growth on liquid hexadecane media (final cell-density equal to 1.9 x 10 10 CFU ml -1). A number of techniques were implemented in the screening of the 70 microorganisms fo

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12

Iroakasi, Ogonnaya Ijeoma. "Characterisation, optimisation and environmental application of selected biosurfactant producers." Thesis, University of Aberdeen, 2012. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=192235.

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Biosurfactants are produced by a variety of microorganisms most of which are bacteria. Their ability to reduce surface and interfacial tensions makes them suitable for environmental applications where hydrophobic compounds are concerned. The biodegradability and lower toxicity of biosurfactants compared to chemical surfactants is ecologically valuable. Four biosurfactant producing bacteria (Alcanivorax borkumensis DSM 11573, Bacillus subtilis DSM 3256, Bacillus licheniformis RS1, and Rhodococcus ruber DSM 43338) were investigated in this study. Their growth and biosurfactant producing profiles

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13

Zhao, Zhenyong. "Biosurfactants enhanced bioremediation of PAHs contamination soil under thermophilic condition." HKBU Institutional Repository, 2007. http://repository.hkbu.edu.hk/etd_ra/822.

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14

Zenginyürek, Özlem Ertürk Handan. "Effects of Biosurfactants on Remediation of Soils Contaminated with Pesticides/." [s.l.]: [s.n.], 2002. http://library.iyte.edu.tr/tezler/master/cevremuh/T000121.rar.

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15

CORTES, MAURICIO. "THE MORPHOLOGY OF FLOTATION FROTHS USING BIOSURFACTANTS AND ITS METABOLIC BYPRODUCTSTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36070@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>A agitação mecânica ou a injeção do ar geram bolhas na célula de flotação, que são estabilizadas pelo uso de espumantes. Partículas hidrofóbicas se aderem às bolhas e em movimento ascencional chegam a superfície da célula formando a espuma mineralizada que sai da célula por transbordamento e/ou remoção mecânica. Espumas na flotação são de grande importância, principalmente com respeito ao tamanho de bolhas e sua estabilidade, bem como a mobilidade; fatores estes cruciais na vi

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16

Kothapalli, Chandrasekhar R. "Catalysis of gas hydrates by biosurfactants in seawater-saturated sand/clay." Thesis, Mississippi State : Mississippi State University, 2002. http://library.msstate.edu/etd/show.asp?etd=etd-07122002-150059.

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17

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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18

Zouari, Oumaima. "Identification, caractérisation, production et application des biosurfactants lipopeptidiques de Pseudomonas spp." Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10220.

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Des souches de Pseudomonas ont été isolées à partir d’échantillons de sol contaminés par les hydrocarbures ou par de l’huile végétale et d’effluent industriel en vue d’en sélectionner les bactéries ayant un potentielle de production des molécules biosurfactantes. Le criblage a été réalisé en s’appuyant essentiellement sur la mesure de la tension de surface et l’activité émulsifiante. Trois souches ont été choisies pour leurs intéressantes activités biosurfactantes et émulsifiantes. Une identification phénotypique et moléculaire des souches sélectionnées a été réalisée en se basant essentiellem

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19

Arroua, Boussad. "Caractérisation des interactions entre les bactéries de réservoirs pétroliers et les interfaces eau-hydrocarbures-roche." Thesis, Pau, 2016. http://www.theses.fr/2016PAUU3053/document.

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La récupération assistée des hydrocarbures par des microorganismes (MEOR) est une technologie potentiellement utilisable pour améliorer l’efficacité de l’extraction pétrolière. Cette technique utilise les capacités métaboliques de certaines souches bactériennes pour récupérer les huiles des réservoirs. Cependant, le manque de connaissances sur la physiologie et les activités métaboliques des microorganismes des réservoirs est un obstacle majeur pour le développement de cette approche. L’objectif de ce travail était d’étudier la physiologie des microorganismes indigènes de réservoirs pétroliers

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20

Maciel, InÃs Maria Cals Theophilo. "AvaliaÃÃo do potencial de bactÃrias para degradar derivados do petrÃleo e produzir biossurfactantes." Universidade Federal do CearÃ, 2003. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1638.

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FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico<br>O presente trabalho descreve os resultados da avaliaÃÃo de duas cepas de bactÃrias isoladas a partir de um efluente contaminado com Ãleo, para degradar derivados do petrÃleo e produzir biossurfactantes. AtravÃs de estudos de suas caracterÃsticas morfolÃgicas, culturais, bioquÃmicas e fisiolÃgicas, as bactÃrias selecionadas, nomeadas preliminarmente cepa 03 e cepa 04, foram identificadas como Acinetobacter spp. e Bacillus spp., respectivamente. A capacidade biodegradativa dessas bactÃrias foi avaliada cultivando-as em mei

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21

Gidudu, Brian. "Biosurfactant Enhanced Bioelectrokinetic Remediation of Petrochemical Contaminated Soil." Diss., University of Pretoria, 2019. http://hdl.handle.net/2263/79238.

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Soil pollution in recent years has emerged as an issue of great environmental concern. Contamination of soil by improper disposal or spillage of petrochemicals and products containing petroleum hydrocarbons is one of such pollution cases highly reported. To remediate petroleum contaminated soil, A DC powered electrokinetic reactor was used with biosurfactants as an enhancement for the remediation process. To begin with, studies were made under voltage variations of 10 V and 30 V with an electrode spacing of 185 mm. Biosurfactant with its producing microbes and biosurfactant free cells were int

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22

Riahi, Belkacem. "Biosurfactants : nouveaux agents de formulation de milieux microstructurés, hôtes d'une réaction enzymatique." Compiègne, 1994. http://www.theses.fr/1994COMPD748.

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De cette étude, il ressort que les sels biliaires, agents de surface biologiques, possèdent de former des solutions monophasiques ternaires ou pseudo-ternaires stables, incorporant de l'eau et des composés organiques divers (alcools et corps gras), en particulier des systèmes du type microémulsion. La détermination partielle de l'organisation interne de nombreux systèmes ternaires ou pseudo-ternaire, ainsi que, les études complémentaires de la conductivité électrique et de la viscosité des microémulsions ont montré que le pouvoir micro structurant des sels biliaires considérés est fort différe

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23

Rizzi, John. "Production of emulsifier by Torulopsis petrophilum." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64014.

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24

Teixeira, Liliana Patrícia dos Reis. "Production of sophorolipds with a branched hydrophobic tail." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/15310.

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Mestrado em Biotecnologia<br>Sophorolipids are a type of biosurfactants produced by several microorganisms, including the yeast Starmerella bombicola. They find application mainly due to their emulsifying activity and antimicrobial properties. Sophorolipids produced by Starmerella bombicola are composed by one sophorose molecule and a hydroxylated fatty acid of 16 or 18 carbon atoms. One or two acetylations can occur, one on each glucose, and a lactonization as well. Despite the interesting characteristics of classic sophorolipids produced by the referred yeast, there are indications that sop

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25

Quinn, Christopher. "The isolation and characterisation of novel biosurfactants from frogs of the Bombina genus." Thesis, University of Ulster, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398970.

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26

Fallon, Agata M. "Study of Hydrocarbon Waste Biodegradation and the Role of Biosurfactants in the Process." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36986.

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Two types of oily waste sludges generated by a railroad maintenance facility were studied to reduce the volume of hydrocarbon waste. The specific goals of this laboratory study were to evaluate rate and extent of microbial degradation, benefits of organism addition, role of biosurfactant, and dewatering properties. The oily waste sludges differed in characteristics and contained a mixture of water, motor oil, lubricating oil, and other petroleum products. Degradation was measured using COD, suspended solids, GC measurements of extractable material, and nonextractable material concentration.

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27

Sousa, Marylane de. "BioconversÃo do glicerol para produÃÃo de biossurfactantes: aplicaÃÃo no preparo de emulsÃes." Universidade Federal do CearÃ, 2011. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6598.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>Os biossurfactantes formam molÃculas anfipÃticas, que possuem em sua estrutura quÃmica segmentos hidrofÃbicos e hidrofÃlicos, espacialmente separados que auxiliam a formaÃÃo de emulsÃes e disponibilizam compostos Ã cÃlula microbiana. Em funÃÃo dessas caracterÃsticas, os emulsificantes reduzem a tensÃo superficial na interface das fases imiscÃveis, permitindo, portanto, que elas se misturem, formando a emulsÃo. Com isso, este trabalho foi dividido em seis etapas: a primeira tendo como objetivo avaliar a produÃÃo de biossurfactante

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Soemo, Angela Renee. "Microenvironment of Monorhamnolipid Biosurfactant Aggregates and Monorhamnolipid Effects on Aqueous Dispersion Properties of Metal Oxide Nanoparticles." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/293563.

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The purpose of this dissertation was two-fold: 1) explore the micelle structure and microenvironment of monorhamnolipids (mRL), produced by Pseudomonas aeruginosa ATCC 9027, and their mixtures with synthetic surfactants in order to postulate possible applications of these materials in industrial products and 2) examine the effects of mRL on commercial metal oxide nanoparticle (NP) aqueous dispersion behavior to reveal the potential impact of microbial secondary metabolites on NP fate and transport in the environment. The mixing behavior of mRL with cetylpyridinium chloride (CPC) was measured

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29

Ngwenya, Carol Zethu. "Enhanced biosurfactant production by Bacillus licheniformis stk 01 for hydrocarbons targeted for bioremediation." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2341.

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Thesis (MTech (Environmental Health))--Cape Peninsula University of Technology, 2016.<br>Environmental remediation of organic and inorganic contaminants such as hydrocarbons has been a research focus area of interest. Chemical surfactants have been extensively used for the remediation of contaminated sites for immobilisation of hydrocarbons from environmental matrices. The focus has been on the impact of chemical surfactants on the environment. These petroleum-based chemical surfactants have raised serious environmental concerns as: 1) they are toxic, 2) they deteriorate the environment owing

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Kandasamy, Ramananthan Shreekanth. "Enhancement of hydrocarbon degradation using biosurfactants from Rhodococcus species in a membrane reactor system." Thesis, Heriot-Watt University, 2014. http://hdl.handle.net/10399/2837.

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Bacterial degradation of hydrocarbons has achieved greater prominence after the discovery of organisms that have been reported to degrade a host of recalcitrant compounds. The ability of bacteria to degrade hydrocarbons is a viable alternative to other energy intensive clean up options. One of these degradative pathways is through the production of biosurfactants, which have exhibited greater advantages than their chemical counterparts. In this work, two strains of the robust Rhodococcus genus namely Rhodococcus opacus and Rhodococcus ruber have been tested for their ability to degrade n-hexad

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31

Neta, Nair do Amaral Sampaio. "Estudo da reaÃÃo de produÃÃo de Ãsteres de Ãcidos graxos por via enzimÃtica objetivando aplicaÃÃes alimentÃcias." Universidade Federal do CearÃ, 2008. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1502.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Diversos experimentos foram realizados com o objetivo de estudar a reaÃÃo de esterificaÃÃo enzimÃtica do Ãcido olÃico com a frutose em meio etanÃlico, visando a sÃntese de biosurfactantes biodegradÃveis. Para tanto, foi utizada a enzima CÃndida Antartica B na temperatura de 55 ÂC e em tempos de reaÃÃo variando entre 48, 72, 96 e 120 horas. De acordo com os resultados obtidos, constatou-se que a citada enzima catalisou preferencialmente o etanol presente no meio reacional para a formaÃÃo do Ãster oleato de etila. Este fato foi confi

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Sampaio, Neta Nair do Amaral. "Estudo da reação de produção de ésteres de ácidos graxos por via enzimática objetivando aplicações alimentícias." reponame:Repositório Institucional da UFC, 2007. http://www.repositorio.ufc.br/handle/riufc/18154.

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SAMPAIO NETA, Nair do Amaral. Estudo da reação de produção de ésteres de ácidos graxos por via enzimática objetivando aplicações alimentícias. 2007. 99 f. : Dissertação (mestrado) - Universidade Federal do Ceará, Centro de Ciências Agrárias, Departamento de Tecnologia de Alimentos, Fortaleza-CE, 2007<br>Submitted by Nádja Goes (nmoraissoares@gmail.com) on 2016-07-05T15:42:42Z No. of bitstreams: 1 2007_dis_nasampaioneta.pdf: 429587 bytes, checksum: e95171ae3ed4bc0f19b43d878deb4444 (MD5)<br>Approved for entry into archive by Nádja Goes (nmoraissoares@gmail.com) on 2016-07-05T15:43:09Z (GMT) No.

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Mulligan, Catherine N. "On the capability of biosurfactants for the removal of heavy metals from soil and sediments." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0017/NQ44526.pdf.

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Mulligan, Catherine. "On the capability of biosurfactants for the removal of heavy metals from soil and sediments." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35023.

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Batch soil washing experiments were used to evaluate the feasibility of using biosurfactants for the removal of heavy metals from a contaminated soil and sediments. Surfactin from Bacillus subtilis, rhamnolipids from Pseudomonas aeruginosa and sophorolipid from Torulopsis bombicola were evaluated using a soil contaminated with hydrocarbon and metals (890 mg/kg zinc, 420 mg/kg copper, 12.6% oil and grease) and metal contaminated sediments (110 mg/kg copper, 3300 mg/kg zinc).<br>Although water alone removed insignificant levels of metals, results showed that the biosurfactants could remove 5% of

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Davila, Anne-Marie. "Production par fermentation et structures chimiques d'une famille de biosurfactants : les sophorolipides de "Candida bombicola"." Aix-Marseille 1, 1993. http://www.theses.fr/1993AIX11014.

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L'etude d'une fermentation produisant un biosurfactant glycolipidique, les sophorolipides de candida bombicola a ete effectuee. Dans des conditions optimisees mettant en uvre une alimentation controlee en glucose et en un substrat lipidique, les esters ethyliques de l'huile de colza, des concentrations de sophorolipides superieures a 300 g. L##1 ont ete obtenues. On decrit dans une premiere partie, la cinetique et le bilan detailles de cette fermentation ou le produit, apparaissant en limitation azotee apres la croissance de la levure, se separe du milieu aqueux. Une deuxieme partie concerne l

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CERESA, CHIARA. "Activity of bacterial biosurfactants against Candida albicans adhesion and biofilm formation on medical-grade silicone." Doctoral thesis, Università del Piemonte Orientale, 2015. http://hdl.handle.net/11579/115553.

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Barros, Francisco Fabio Cavalcante. "Estudo das variaveis de processo e ampliação de escala na produção de biossurfactante por Bacillus subtilis em manipueira." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256706.

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Orientador: Glaucia Maria Pastore<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-08-08T11:37:31Z (GMT). No. of bitstreams: 1 Barros_FranciscoFabioCavalcante_M.pdf: 816271 bytes, checksum: 1ac93e87eef201f2b03cad5fc4da0cac (MD5) Previous issue date: 2007<br>Resumo: A bactéria Bacillus subtilis tem a capacidade de produzir biossurfactantes do grupo dos lipopeptídeos, dentre os quais, o que mais se destaca é a surfactina, um dos que possui maior atividade superficial. Esse composto é capaz de reduzir a tensã

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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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Rosato, Antonella <1987&gt. "Bioremediation Enhancement of Marine Sediments Contaminated by Crude Oil with Biogenic Pollutants Mobilizing Agents and Biosurfactants." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amsdottorato.unibo.it/8143/1/Rosato_Antonella_tesi.pdf.

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One of the main limitations to the bioremediation of oil-contaminated marine sediments is the low hydrocarbons bioavailability. Aim of this PhD research project is to identify an environmental friendly approach to increase hydrocarbons bioavailability and biodegradation in oil-contaminated marine sediments. Several surfactants/pollutant mobilizing agents have been selected and applied to slurry microcosms: two microbial surfactants (sophorolipids and rhamnolipids), two types of cyclodextrins (hydroxypropyl- and randomly methylated- β-cyclodextrins; HPB-CD and RAMEB-CD), two commercial soy lec

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Šimšová, Veronika. "Biotechnologická produkce sophorolipidů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2019. http://www.nusl.cz/ntk/nusl-401874.

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This diploma thesis deals with the microbial production of sophorolipids by the Starmerella genus yeasts. The theoretical part of the thesis includes general characteristics of biosurfactants with the focus on sophorolipids. There are described the options of biotechnological production of sophorolipids and fields of their possible applications. Furthermore, the theoretical part deals with the describtion of Starmerella bombicola yeast, which is often used for biotechnological production of sophorolipids. Six strains of the Starmerella genus were cultured in the basic medium suitable for sopho

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Islam, Sanaiya. "Degradation of Ternary Mixture of Trihalomethanes in a Biotrickling Filter in the Presence of Biosurfactant and Fungi." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1584001114684329.

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Maciel, Inês Maria Cals Theophilo. "Avaliação do potencial de bactérias para degradar derivados do petróleo e produzir biossurfactantes." http://www.teses.ufc.br/, 2003. http://www.repositorio.ufc.br/handle/riufc/1229.

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MACIEL, Inês Maria Cals Theophilo. Avaliação do potencial de bactérias para degradar derivados do petróleo e produzir biossurfactantes. 2003. 40 p. Dissertação (Mestrado em Ciências Marinhas Tropicais) - Universidade Federal do Ceará, Instituto de Ciências do Mar, Fortaleza, 2009.<br>Submitted by Debora Oliveira (deby_borboletinha@hotmail.com) on 2011-11-22T14:03:20Z No. of bitstreams: 1 2003_dis_imctmaciel.pdf: 490927 bytes, checksum: c86bd045b67c0d15f211c99957f58bdf (MD5)<br>Approved for entry into archive by Nadsa Cid(nadsa@ufc.br) on 2011-11-23T18:50:13Z (GMT) No. of bitstreams: 1 2003_dis

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Liley, Jessica R. "Optimising the blending of biosurfactants with conventional home and personal care components : a surface and solution study." Thesis, University of Oxford, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.711697.

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Chaprão, Marcos José. "Aplicação de biossurfactantes na remediação de areia contaminada com hidrocarbonetos." Universidade Católica de Pernambuco, 2015. http://www.unicap.br/tede//tde_busca/arquivo.php?codArquivo=1075.

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Os biossurfactantes, compostos tensoativos produzidos por microorganismos, vem sendo utilizados com sucesso na remediação de solos em função da eficiência dessas biomoléculas no aumento da dispersão e da biodegradação de hidrocarbonetos e de suas propriedades como biodegradabilidade e toxicidade reduzida. Nesse sentido, esse trabalho teve como objetivo investigar a aplicação de dois biossurfactantes, sendo um obtido da levedura Candida sphaerica e outro da bactéria Bacillus sp., produzidos a partir de resíduos industriais, na remediação de hidrocarbonetos de óleo lubrificante de motor em solo

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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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Meylheuc, Thierry. "Influence de biosurfactants sur l'adhesion de listeria monocytogenes a des surfaces inertes : consequences sur la desinfection (doctorat : microbiologie)." Paris 11, 2000. http://www.theses.fr/2000PA114835.

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Ngoya, Sandra. "Caractérisation physiologique et physico-chimique des Pseudomonas Fluorescens productrices ou non de biosurfactants. Première approche du comportement bioadhésif." Rouen, 2007. http://www.theses.fr/2007ROUES054.

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Pseudomonas fluorescens est une bactérie psychrotrophe ubiquitaire retrouvée dans tout type d’environnement, incluant les sols, les eaux (marines et douces), l’air, mais également associée à des hôtes eucaryotes (végétaux, animaux, voire humain). Les biosurfactants sont une classe de molécules tensioactives, structuralement variées et synthétisées par de nombreux microorganismes. De nombreux travaux ont révélé que les biosurfactants avaient un effet limitant sur l’adhésion des bactéries aux surfaces. La surface membranaire étant la première barrière entre les cellules et l’environnement, ce tr

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Shakeri, Fard Parvin. "Production and purification of biosurfactants and study of their influence on surface properties of stainless steel and Teflon." Thesis, Lille 1, 2010. http://www.theses.fr/2010LIL10006/document.

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Dans cette étude, un ensemble de molécules biosurfactantes a été choisi en fonction de leur diversité structurale et leur aptitude à être produites dans des procédés industriels. Cet ensemble contient des membres des trois familles de composés lipopeptidiques produits par des souches de Bacillus subtilis comprenant la surfactine S1, l’iturine A et la mycosubtiline (deux membres de la famille des iturines) et la fengycine, ainsi que des rhamnolipides produits par Pseudomonas aeruginosa PTCC 1637. Après purification et/ou caractérisation par plusieurs méthodes analytiques, ces composés ont été é

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Corre, Marie-Hélène. "Identification et caractérisation de composés produits par des bactéries environnementales pour la lutte biologique contre Legionella pneumophila." Thesis, Poitiers, 2018. http://www.theses.fr/2018POIT2309/document.

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Les circuits et réseaux d’eau subissent épisodiquement des problèmes de contamination par des microorganismes tels que Legionella pneumophila, conduisant à la dégradation de la qualité microbiologique de l’eau circulante. De nouveaux moyens de traitements doivent être mis en place de façon notamment à limiter l’usage de biocides chimiques. Ce travail de thèse s’inscrit dans cette problématique et a pour objectif d’identifier de nouveaux composés actifs contre L. pneumophila en tenant compte de son comportement et de ses interactions au sein de son microenvironnement. De manière à obtenir des c

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Gueissaz-Teufel, Muriel. "Production sous conditions non stériles de biosurfactants synthétisés à partir de rejets industriels pour le lavage de sol contaminé." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0018/MQ46651.pdf.

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