Auswahl der wissenschaftlichen Literatur zum Thema „Enzymes ligninolytiques“
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Dissertationen zum Thema "Enzymes ligninolytiques":
Leseleuc, Joe͏̈l de. „Systèmes enzymatiques ligninolytiques de Phanerochaete chrysosporium et Streptomyces viridosporus“. Toulouse, INSA, 1991. http://www.theses.fr/1991ISAT0034.
Herpoël-Gimbert, Isabelle. „Maîtrise de la production et de la mise en oeuvre d'enzymes ligninolytiques fongiques dans le domaine papetier“. Aix-Marseille 1, 2001. http://www.theses.fr/2001AIX11004.
Chausse, Rémi. „Recherche d'enzymes ligninolytiques dans la biodiversité, mise en évidence d'enzymes de type oxydoréductase provenant de l'ascomycète Scedosporium apiospermum“. Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILR077.
AbstractThe goal of this thesis was to search for new fungal ligninolytic enzymes from the environment. Samples of woody biomass were collected in three different ecosystems: a forest composed of deciduous trees (beech, birch) and gymnosperm (Cupressus macrocarpa), a cep of chardonnay infected with grapevine trunk disease and finally a decaying tree stump in a parking lot of an urban area. 71 strains were isolated from these environments. To select the fungal strain able to produce enzymes of interest a screening for laccase, Lip and Mnp was carried out. In order to maximize the completeness of this screening different culture conditions were used. To trigger the production of ligninolytic enzymes by the fungi Three culture media supplemented or not with inductors were used for the screening. The first medium tested was a rich medium without induction. The two other media contained respectively wheat straw and guaiacol as inductors. Besides, sampling was performed after 7 and 14 days as the kinetics of enzyme production could vary for a given fungal strain and culture conditions. 71 strains were tested for ligninolytic activities and 15 of them presented at least one enzymatic activity. Two of them showed their ligninolytique activities only on the media with inductors. Among the 15 fungi with enzymatic activities of interest, two basidiomycetes and 13 ascomycetes belonging to 6 different genera were identified. 12 ascomycetes were already described in the literature with laccase, Lip or Mnp activity. To our knowledge, the two basidiomycetes Peniophora versicolor and Piptoporus betulinus were not described for producing ligninolytic activities. Besides Scedosporium apiospermum showed laccase activity during the screening. Experiments of lignin degradation were carried out with the culture supernatant of this fungus. The results showed that the enzymes contained in S. apiospermum were able to modify the lignin polymer. This fungus was thus selected to further characterize its laccase like enzymes detected by the screening. Thanks to an in-silico screening in the genome of S. apiospermum 9 putative laccase genes were detected. Five putative laccase genes were then amplified with success from a cDNA library obtained from the mRNA of the fungus. Those five genes were cloned in the yeast Yarrowia lipolytica. In the conditions of the study, two genes called Lac2 and ITMO2 allowed the production of two active enzymes. In their primary structure, the two enzymes present the characteristic sites of copper coordination of multicopper oxidases. Lac2 and ITMO2 present an optimum pH of 3 and 5 respectively. Those two enzymes show an oxidative activity on various phenolic substrates such as 2.6 dimetoxyphenol, pyrogallol and dopamine but also on non-phenolic substrates including 2,2′-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) and o-Dianisidine
Capdevila, Cécile. „Etude de la sécrétion et développement de nouvelles conditions de culture pour la production des enzymes ligninolytiques par le basidiomycète Phanerochaete chrysosporium INA-12“. Aix-Marseille 2, 1990. http://www.theses.fr/1990AIX22071.
Burlat, Vincent. „Étude immunocytochimique de la distribution ultrastructurale des lignines dans la paille de blé et de son influence sur le mode d'action des champignons ligninolytiques : application aux pâtes à papier“. Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10100.