Dissertations / Theses on the topic 'Biodegradation'
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Kurt, Zohre. "Biodegradation of chlorinated compounds at interfaces and biodegradation of 4-nitroaniline." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/50111.
Full textMarino, Fabien. "Biodegradation of paraffin wax." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0030/MQ50640.pdf.
Full textMarino, Fabien. "Biodegradation of paraffin wax." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21312.
Full textKinetic studies performed with Rhodococcus IS01 growing on mixtures of n-alkanes showed that the hydrocarbons were degraded in ascending order of chain length: shortest to longest chain. The short lag period between the biodegradation of the different n-alkanes suggested that the growth of Rhodococcus IS01 on mixtures of n-alkanes followed some form of diauxie. Further kinetic studies were conducted growing Rhodococcus IS01 on individual and various mixtures of n-alkanes; these showed that the initial first-order oxidation constant decreased with increasing chain length. This trend is suspected to be due to an enzyme specificity constraint rather than to a mass transfer limitation. In addition, it was also observed that the maximum specific growth rate constant (mumax) increased with increasing n-alkane chain length.
Rhodococcus IS01 was also found to produce a cell-associated biosurfactant.
McGrath, John W. "The biodegradation of organophosphonates." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295419.
Full textZhong, Sheng-Ping. "Biodegradation of medical polymers." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333769.
Full textArshad, Khubaib, and Muhammad Mujahid. "Biodegradation of Textile Materials." Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-20862.
Full textProgram: Master Programme in Textile Technology
Malandra, Lida 1975. "Biodegradation of winery wastewater." Thesis, Stellenbosch : University of Stellenbosch, 2003. http://hdl.handle.net/10019.1/16385.
Full textENGLISH ABSTRACT: Large volumes of wastewater are generated annually during the grape harvest season from various processing and cleaning operations at wineries, distilleries and other wine-related industries. South African regulatory bodies dictate that wastewater should have a pH of 5.5 to 7.5 and a chemical oxygen demand (COD) lower than 75 mg/L. However, winery wastewater has a typical pH of 4 to 5 and a COD varying between 2 000 and 12 000 mg/L. Urban wineries channel the wastewater to local sewage treatment facilities and are often heavily fined for exceeding governmental requirements. Rural wineries usually have little or no treatment operations for their wastewater and it is often irrigated onto crops, which may result in environmental pollution and contamination of underground water resources. Various criteria are important in choosing a wastewater treatment system, such as an ecofriendly process that is flexible to withstand various concentration loads and characteristics, requiring low capital and operating costs, minimal personal attention and do not require too much land. In this study, a large variation in COD, pH and chemical composition of the winery wastewater was observed that could be related to varying factors such as the harvest load, operational procedures and grape variety. Wastewater from destemming and pressing operations contained higher concentrations of glucose, fructose and malic acid, which originated from the grape berries. The fermentable sugars (glucose and fructose) contributed to almost half of the COD with a smaller contribution from ethanol and acetic acid. The low pH can be ascribed to relative high concentrations of organic acids in the wastewater. The efficacy of biological treatment systems depends strongly on the ability of microorganisms to form biofilm communities that are able to degrade the organic compounds in the wastewater. Preliminary identification of microorganisms that naturally occur in winery wastewater indicated the presence of various bacterial and yeast species that could be effective in the biological treatment of the wastewater. When evaluated as pure cultures under aerobic conditions, some of the yeast isolates effectively reduced the COD of a synthetic wastewater, whereas the bacterial isolates were ineffective. The most effective yeast isolates were identified as Pichia rhodanensis, Kloeckera apiculata, Candida krusei and Saccharomyces cerevisiae. Our search for cost-effective biological treatment systems led to the evaluation of a Rotating Biological Contactor (RBC) for the treatment of winery wastewater. The RBC was evaluated on a laboratory scale with 10% (v/v) diluted grape juice and inoculated with a mixed microbial community isolated from winery wastewater. The results showed a reduction in the COD that improved with an extended retention time. Evaluation of the RBC on-site at a local winery during the harvest season resulted on average in a 41% decrease in COD and an increase of 0,75 pH units. RFLP analysis of the biofilm communities within the RBC confirmed a population shift in both the bacterial and fungal species during the evaluation period. The most dominant yeast isolates were identified with 18S rDNA sequencing as Saccharomyces cerevisiae, Candida intermedia, Hanseniaspora uvarum and Pichia membranifaciens. All these species are naturally associated with grapes and/or water and with the exception of Hanseniaspora uvarum, they are able to form either simple or elaborate pseudohyphae.
AFRIKAANSE OPSOMMING: Groot hoeveelhede afloopwater word jaarliks gedurende die druiwe-oestyd deur verskeie prosessering- en skoonmaakoperasies deur wynkelders, distilleer- en ander wynverwante industrieë gegenereer. Suid-Afrikaanse beheerliggame vereis dat afloopwater ‘n pH van 5.5 tot 7.5 en ‘n chemiese suurstofbehoefte (COD) van minder as 75 mg/l moet hê. Kelderafloopwater het egter gewoonlik ‘n pH van 4 tot 5 en ‘n COD van 2 000 tot 12 000 mg/L. Stedelike wynkelders voer die afloopwater na ń plaaslike rioolsuiweringsaanleg wat dikwels tot swaar boetes vir oortreding van die wetlike vereistes lei. Plattelandse wynkelders het gewoonlik min of geen behandelingsprosesse vir hul afloopwater nie en gebruik die water dikwels vir gewasbesproeiing, wat tot omgewingsbesoedeling en kontaminasie van ondergrondse waterbronne kan lei. Verskeie kriteria is belangrik in die keuse van ‘n waterbehandelingstelsel, byvoorbeeld ‘n omgewingsvriendelike proses wat verskillende konsentrasieladings en samestellings kan hanteer, ‘n lae kapitaal- en bedryfskoste en minimale persoonlike aandag vereis en min ruimte benodig. Hierdie studie het getoon dat kelderafloopwater ‘n groot variasie in COD, pH en chemiese samestelling het wat met wisselende faktore soos die oeslading, operasionele prosesse en selfs die druifkultivar verband kan hou. Afloopwater van ontstingeling- en parsoperasies het hoër konsentrasies glukose, fruktose en appelsuur wat van die druiwekorrels afkomstig is. Die fermenteerbare suikers (glukose en fruktose) dra tot amper 50% van die COD by, met ‘n kleiner bydrae deur etanol en asynsuur. Die lae pH kan grootliks aan organiese sure in die afloopwater toegeskryf word. Die effektiwiteit van biologiese behandelingstelsels steun sterk op die vermoë van mikroorganismes om biofilmgemeenskappe te vorm wat die organiese verbindings in die afloopwater kan afbreek. Voorlopige identifikasie van mikro-organismes wat natuurlik in wynafloopwater voorkom, het die teenwoordigheid van verskeie bakteriese en gisspesies aangedui. Evaluering van hierdie isolate onder aërobiese toestande het getoon dat sommige van die gis-isolate die COD van ‘n sintetiese afloopwater effektief kon verlaag, terwyl die bakteriese isolate oneffektief was. Die mees effektiewe gis-isolate is as Pichia rhodanensis, Kloeckera apiculata, Candida krusei en Saccharomyces cerevisiae geïdentifiseer. Ons soektog na ‘n koste-effektiewe biologiese behandelingsisteem het tot die evaluering van ‘n ‘Rotating Biological Contactor’ (RBC) vir die behandeling van afloopwater gelei. Die RBC is op laboratoriumskaal met 10% (v/v) verdunde druiwesap geëvalueer en met ‘n gemengde mikrobiese gemeenskap wat uit afloopwater geïsoleer is, innokuleer. Die resultate het ‘n verlaging in die COD getoon wat met ‘n langer retensietyd verbeter het. Evaluering van die RBC by ‘n plaaslike wynkelder gedurende die oesseisoen het gemiddeld ‘n verlaging van 41% in die COD en ‘n verhoging van 0,75 pH eenhede getoon. RPLP analise van die biofilmgemeenskappe in die RBC het ‘n bevolkingsverskuiwing in beide die bakteriese en swamspesies aangetoon. Die mees dominante gisspesies is met 18S rDNA volgordebepaling as Saccharomyces cerevisiae, Candida intermedia, Hanseniaspora uvarum en Pichia membranifaciens geïdentifiseer. Al hierdie spesies word gewoonlik met druiwe en/of water geassosieer en is, met die uitsondering van Hanseniaspora uvarum, in staat om òf eenvoudige òf komplekse pseudohife te vorm.
Tikoo, Vidya. "Microalgal biodegradation of pentachlorophenol." Thesis, University of the West of England, Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319256.
Full textShearer, Brad David. "Enhanced Biodegradation in Landfills." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/33215.
Full textMaster of Science
PAULUS, SYLVIE. "Biodegradation de steranes petroliers." Université Louis Pasteur (Strasbourg) (1971-2008), 1993. http://www.theses.fr/1993STR13041.
Full textZibdeh, I. R., G. R. Lanza, and Phillip R. Scheuerman. "Biodegradation of Cresol Isomers." Digital Commons @ East Tennessee State University, 1995. https://dc.etsu.edu/etsu-works/2901.
Full textPrincivalle, Jessica. "How important is soil microbial diversity for pesticide biodegradation function and robust biodegradation kinetics?" Thesis, University of Reading, 2017. http://centaur.reading.ac.uk/73803/.
Full textSmith, Maree J. "Biodegradation of the cyanotoxin cylindrospermopsin /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18474.pdf.
Full textGilardi, Gianfranco. "Spectroscopic studies of lignin biodegradation." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46785.
Full textMüller, Stefan. "Biodegradation of polyethylene thermolysis residue." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0005/MQ44028.pdf.
Full textMüller, Stefan 1971. "Biodegradation of polyethylene thermolysis residue." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=20509.
Full textIt was also found that the acclimation of the microorganism to the substrate was an important factor in the degradation of the residue. Using two different acclimation times, two different strains of R. rhodochrous were selected for in the acclimation step. The two different strains showed very different degradation patterns of the polyethylene thermolysis residue. Strain A showed almost no effect of chain length on the degradation rate of the hydrocarbons while the degradation rate of the hydrocarbons for strain B decreased with increasing chain length. This difference in the degradation pattern was attributed to the varying amounts of enzymes present in each strain. Another factor found to affect the degradation pattern was the liquidity of the polyethylene thermolysis residue.
Gauthier, Herve. "Biodegradation of pharmaceuticals by microorganisms." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32347.
Full textLa présence de résidus de produits pharmaceutiques dans l'eau représente une sérieuse menace pour l'environnement et la santé humaine. Le devenir de ces produits pharmaceutiques dans l'environnement n'a pas été adéquatement étudié. Le sulfaméthoxazole, le sulfaméthizole, le triméthoprime ainsi que le carbamazepine sont parmi ces composés pharmaceutiques qui ont une importante bioactivité et sont considérés comme polluants persistants. Dans ce projet, la biodégradation des ces produits à été étudiée afin d'évaluer le devenir de ceux-ci dans l'environnement. Une source de carbone facilement biodégradable a été utilisé lors des expériences afin de stimuler le mécanisme d`élimination par co-métabolisme. Cinq microorganismes ont été utilisés afin d'évaluer la biodégradabilité des produits pharmaceutiques sélectionnés et aussi identifier les métabolites résultant de leur biodégradation. Il a été démontré que la biodégradation est survenue pour le sulfaméthoxazole, le sulfaméthizole ainsi que le carbamazépine. Le triméthoprime à quant lui démontré une forte résistance à la biodégradation. Le microorganisme Rhodococcus rhodochrous a démontré une habileté particulière à dégrader les produits pharmaceutiques. La présence de métabolites a également été confirmée par analyse HPLC et spectrometrie de masse.
Dooley, S. "Biodegradation of machine cutting oil." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598601.
Full textChongcharoen, Rotsaman. "Biodegradation of formaldehyde by methylotrophs." Thesis, University of Warwick, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269080.
Full textStarkey, Michelle. "Biodegradation of lubricants in soil." Thesis, University of Reading, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413409.
Full textAli, Saiqa Mubeen. "Thermophilic biodegradation of phenolic compounds." Thesis, University College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339092.
Full textLubben, Anneke Twaambo. "Biodegradation of liquid scintillant cocktails." Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395992.
Full textKuippers, Gina. "The biodegradation of isosaccharinic acid." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/the-biodegradation-of-isosaccharinic-acid(6a3cd692-8997-4cbc-bd33-2bee7c9741b4).html.
Full textYagoub, Sally. "Biodegradation of leather solid waste." Thesis, University of Northampton, 2006. http://nectar.northampton.ac.uk/2675/.
Full textRomakkaniemi, I. (Idamaria). "Biodegradation of synthetic textile fibres." Bachelor's thesis, University of Oulu, 2018. http://urn.fi/URN:NBN:fi:oulu-201808232664.
Full textSynteettiset kuidut ovat nopeasti yleistynyt materiaali tekstiiliteollisuudessa. Niitä käytetään monissa arkipäiväisissäkin tuotteissa sellaisenaan tai sekoitettuna muiden kuitujen kuten puuvillan kanssa. Niillä pyritään saavuttamaan tekstiilille halutut erityisominaisuudet. Synteettiset tekstiilikuidut koostuvat polymeereistä ja eivät pääsääntöisesti hajoa luonnossa sellaisenaan. Niiden kerääntyminen luontoon ja meriin on kasvava ympäristöongelma ympäri maailmaa. Synteettiset polymeerit voivat olla vaarallisia eliöille joutuessaan niiden ruuansulatukseen. Tämän ongelman ratkaisemiseksi on pyritty löytämään biologisia menetelmiä hajottaa synteettisiä kuituja. Erilaisia mikro-organismeja on tutkittu, jotta löydettäisiin organismeja, jotka pystyisivät hyödyntämään synteettisiä kuituja metaboliassaan. Tässä kandidaatin työssä pyrittiin keräämään mahdollisimman kattavasti tietoa tähän päivään mennessä tehdyistä tutkimuksista synteettisten kuitujen biohajoamisesta. Erilaiset kuitulajit ja niiden komponentit määriteltiin ja selvitettiin, millaisella prosessilla niitä valmistetaan. Jokaisen kuidun ja niiden komponenttien biohajoamista selvitettiin mikrobien ja entsyymien avulla. Eniten tutkimustuloksia löytyi polyuretaanikuiduista ja vähiten aromaattisista polyamidikuiduista. Tiedonhankinnan tuloksena voisi todeta, että aihe vaatii yhä tieteellistä lisätutkimusta, jotta löydetään tehokas biologinen keino hajottaa synteettisiä kuituja. Tämä kirjallisuustutkielman tavoite on antaa laaja yleiskuva synteettisten tekstiilikuitujen aiheuttamasta saasteongelmasta ja niiden biologisesta hajottamisesta sekä pyrkiä korostamaan, että kerättyjä taustatietoja tulisi hyödyntää ongelman ratkaisemisessa
Wu, Shuyun. "Anaerobic Biodegradation Patterns for Biodiesel." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1417784154.
Full textPhale, Prashant S. "Biodegradation Of 1-Naphthoic Acid." Thesis, Indian Institute of Science, 1994. https://etd.iisc.ac.in/handle/2005/91.
Full textPhale, Prashant S. "Biodegradation Of 1-Naphthoic Acid." Thesis, Indian Institute of Science, 1994. http://hdl.handle.net/2005/91.
Full textCruz, Morató Carles. "Biodegradation of pharmaceuticals by Trametes versicolor." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/283222.
Full textPharmaceutical active compounds (PhACs) are an important group of emerging contaminants that have raised an increasing interest in the scientific community due to their ubiquitous presence in the environment and their difficult degradation. Some of these drugs are extensively used as non-prescription drugs and after their intake, are excreted with urine and faeces either as active substances or metabolites. These substances come into wastewater treatment plants where some compounds are not efficiently removed, being able to reach surface, groundwater and subsequently, drinking water. The present work assesses the feasibility of PhACs bioremediation by white-rot fungi (WRF). WRF have the potential to degrade a wide range of xenobiotic and recalcitrant contaminants due to their unspecific enzymatic system, able to act on diverse substrates through the action of intracellular (i.e. cytrochrome P450 system) and extracellular (i.e laccases and peroxidases) enzymes. The fungus Trametes versicolor has been chosen to carry out the degradation study of some analgesics and anti-inflammatory (ketoprofen and diclofenac), anti-epileptics (carbamazepine), lipid regulators (clofibric acid), antibiotics (ofloxacin) and a X-ray contrast agent (iopramide). The first step in the research deals with the preliminary assessment of the individual PhACs degradation by T. versicolor at Erlenmeyer scale and sterile conditions. To obtain further insights in the mechanism of PhACs degradation by the fungus, the transformation products were identified as well as the enzyme responsible for the degradation of the parent compound with the aim of proposing a degradation pathway. In addition, an assessment of the toxicity of the broth, where transformation products were present, was included. Furthermore, with the aim of scale up the PhACs degradation process, a fluidized bed bioreactor was employed for the degradation of carbamazepine and clofibric acid, operated in both continuous and batch mode. Results also include the identification of transformation products and the toxicity assessment.On the other hand, due to the great number of publications about the degradation of pharmaceuticals by white-rot fungi that appeared over the course of this thesis, it was decided to include a literature review to evaluate the current state of the art in this topic. Finally, in an attempt to scale up the process to real approaches and thus provide a better estimation of the potential environmental impact of the application of such process, T. versicolor was used in a non-sterile batch bioreactor treatment for the removal of pre-existent PhACs from urban and hospital wastewater, where many contaminants and other microorganism are present. In preliminary experiments with urban wastewater, it was found the necessity of an extra source of carbon and nitrogen to maintain the activity of the fungus in the wastewater. Moreover, an important removal was observed for almost all drugs detected in both urban and hospital wastewater, together with a remarkable reduction of the overall toxicity.
Shin, Kwanghee. "Biodegradation of diphenylamine and cis-dichloroethene." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33974.
Full textAl-Lagtah, Nasir Mohammed A'mro. "Nutrient biodegradation in sequential batch reactor." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491979.
Full textElsayed, Omniea. "Biodegradation of chloroacetanilide herbicides in wetlands." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAJ003/document.
Full textChloroacetanilide herbicides are widely used in agriculture, and thereby contribute to environmental pollution. Their fate, including in redox-dynamic receptor ecosystems such as wetlands, remains poorly understood. In this work, microbial degradation of chloroacetanilides (metolachlor, acetochlor and alachlor) was investigated by emerging chemical and molecular biological approaches, at the lab-scale using microcosm columns, and in situ, in outdoor constructed wetlands designed for the treatment of chemical pollutants originating from agriculture.A novel compound-specific isotope analysis (CSIA) method was developed, and the results indicated biodegradation of chloroacetanilides in wetlands, which was also suggested by detection of ethane sulfonic acid and oxanilic acid degradation products. In lab-scale wetland microcosms, chloroacetanilides were mainly degraded in anoxic rhizosphere zones, suggesting a predominant role of anaerobic processes. Chiral chromatographic analysis of metolachlor revealed preferential degradation of the (S) enantiomer of metolachlor, and further confirmed the role of biological processes in chloroacetanilide dissipation. Changes in hydrochemical variables and hydraulic conditions correlated with differences in wetland bacterial composition detected by terminal restriction fragment length polymorphism (T-RFLP) and pyrosequencing analyses of the bacterial 16S rRNA gene, confirming the potential of DNA-based bioindicators for follow-up of ecosystem functioning.On the basis of this work, detecting and identifying the microorganisms and biochemical pathways responsible for chloroacetanilide degradation in wetlands, as well as developing bacterial gene-based indicators of wetland functioning, emerge as research objectives for the near future
Launen, Loren A. "Pyrene biodegradation by Penicillium janthinellum SFU403." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0022/NQ51887.pdf.
Full textSafinowski, Michael. "Anaerobic biodegradation of polycyclic aromatic hydrocarbons." kostenfrei, 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=97648627X.
Full textHerwijnen, René van. "Metabolic and cometabolic biodegradation of PAHs." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2003. http://dare.uva.nl/document/87041.
Full textRazal, Ramon A. "Studies on lignin biosynthesis and biodegradation." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-07282008-135150/.
Full textPainter, Susan Elizabeth. "Anaerobic biodegradation of phthalic acid esters." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/25185.
Full textBourne, Thomas Franklin. "Biodegradation of keratins and phenolic compounds." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/25403.
Full textO'Grady, Devin. "Biodegradation of 17alpha-ethinylestradiol in wastewater." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18488.
Full textPlusieurs composés pharmaceutiques tel que le 17a-ethinylestradiol (EE2), l'ingrédient actif des contraceptifs oraux, ne sont pas efficacement éliminés lors du traitement des eaux usées et se biodégradent peu dans l'environnement. Au cours de ce projet de maîtrise, des techniques analytiques ont été développées afin de mesurer de faibles concentrations d'EE2 et la biodégradabilité d'EE2 a été étudiée en utilisant cinq types de bactéries. Une identification préliminaire des produits de dégradation a également été effectuée. Une méthode d'extraction en phase solide a été développée afin de préconcentrer les échantillons avant l'analyse par HPLC. L'optimisation de la méthode a permis d'obtenir une méthode reproductible offrant un haut pourcentage de récupération de l'analyte et ce, à faible coût. La préconcentration de l'échantillon a aussi permis de réduire la limite d'analyse par HPLC de 1.73 ppm à 0.173 ppm. R. erythropolis a dégradé jusqu'à 47% de la concentration initiale d'EE2 en 13 h, tandis qu'après 65 h, R. equi a engendré une dégradation atteignant 39% de la concentration initiale d'EE2. Aucune dégradation significative a été observée en utilisant R. rhodochrous et R. zopfii. Finalement, l'analyse préliminaire des produits de dégradation confirme la présence de phénol parmi d'autres produits de dégradation de poids moléculaires élevés.
Gartshore, James. "Biodegradation of plasticizers by rhodotorula rubra." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33968.
Full textThe degradation of D(PG)DB or D(EG)DB led to a significant increase in solution toxicity. This increase in toxicity was associated with the production of metabolites resulting from the incomplete breakdown of the original plasticizers. The metabolites responsible for the acute toxicity in the D(PG)DB system were identified as isomers of di-propylene glycol monobenzoate. A mechanism for the formation of this metabolite was proposed. Although the metabolite observed when D(EG)DB was being degraded was not isolated, it was tentatively identified as di-ethylene glycol monobenzoate by analogy to the D(PG)DB system. This same metabolite was observed when D(EG)DB was degraded by the fungus, Aspergillus niger ATCC 9642-U.
In contrast, there were no observable metabolites nor increases in toxicity in the media during the degradation of B(EH)A, DOP, or DOTP by R. rubra. These observations also differ from those of earlier work in which it was reported that the degradation of all three of these plasticizers by bacteria resulted in the production of toxic metabolites.
Collectively, these results do not support the use of D(PG)DB and D(EG)DB as environmentally safe alternatives to B(EH)A, DOP or DOTP.
Ternan, Nigel G. "Biodegradation of aminoalkylphosphonates by environmental bacteria." Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361307.
Full textMcClure, P. J. "The biodegradation of pharmaceutical effluent constituents." Thesis, Bucks New University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233071.
Full textMiller, N. D. "On the biodegradation of implantable polymers." Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378650.
Full textWright, Michael Alan. "Biodegradation of synthetic ester-based lubricants." Thesis, Cranfield University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283863.
Full textDhillon, Hardial Singh. "Microbial biodegradation in soil and groundwater." Thesis, Loughborough University, 1988. https://dspace.lboro.ac.uk/2134/33040.
Full textVilo, Muñoz Claudia Andrea. "Understanding Microbial Biodegradation of Environmental Contaminants." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc801956/.
Full textBertin, Marcus A. "Biodegradation and Environmental Fate of Nonylphenol." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092067810.
Full textZafar, Urooj. "Biodegradation of polyurethane under composting conditions." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/biodegradation-of-polyurethane-under-composting-conditions(0157c580-bffe-4b2f-a019-a7510fa3ac4e).html.
Full textMcCloskey, Colleen B. "Biodegradation of benzene in soil systems." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-01312009-063028/.
Full textPruden, Amy. "Biodegradation of methyl tert-butyl ether." Cincinnati, Ohio : University of Cincinnati, 2002. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin1027943573.
Full text