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Dissertations / Theses on the topic 'Chitons'

Author: Grafiati
Published: 4 June 2021
Last updated: 26 July 2025

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1

Brooker, Lesley Rita. "Revision of Acanthopleura guilding, 1829 (Mollusca: Polyplacophora) based on light and electron microscopy." Thesis, Brooker, Lesley Rita (2003) Revision of Acanthopleura guilding, 1829 (Mollusca: Polyplacophora) based on light and electron microscopy. PhD thesis, Murdoch University, 2003. https://researchrepository.murdoch.edu.au/id/eprint/479/.

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Light and scanning electron microscopy have been utilized to further resolve the taxonomic status of the genus Acanthopleura Guilding, 1829 (Mollusca: Polyplacophora) following Ferreira's 1986 controversial revision, which synonymised four well-established genera and numerous species. Specimens of the 19 nominal species of the genus Acanthopleura, together with those from five widely disparate, geographic populations of one of these species (A. gemmata), along with specimens of the outgroup, Onithochiton quercinus Gould, 1846), have been utilised. A consideration of gross morphological char
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2

Brooker, Lesley Rita. "Revision of Acanthopleura guilding, 1829 (Mollusca: Polyplacophora) based on light and electron microscopy." Brooker, Lesley Rita (2003) Revision of Acanthopleura guilding, 1829 (Mollusca: Polyplacophora) based on light and electron microscopy. PhD thesis, Murdoch University, 2003. http://researchrepository.murdoch.edu.au/479/.

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Light and scanning electron microscopy have been utilized to further resolve the taxonomic status of the genus Acanthopleura Guilding, 1829 (Mollusca: Polyplacophora) following Ferreira's 1986 controversial revision, which synonymised four well-established genera and numerous species. Specimens of the 19 nominal species of the genus Acanthopleura, together with those from five widely disparate, geographic populations of one of these species (A. gemmata), along with specimens of the outgroup, Onithochiton quercinus Gould, 1846), have been utilised. A consideration of gross morphological char
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3

Rostal, David Carl. "The effect of salinity on habitat selection of two Oregon chiton species (Katharina tunicata and Mopalia hindsii)." PDXScholar, 1986. https://pdxscholar.library.pdx.edu/open_access_etds/3688.

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Adult specimens of Katharina tunicata (mean weight = 10.23 grams) and Mopalia hindsii (mean weight = 10.90 grams) were tested for osmotic stress tolerance and oxygen consumption rates in a series of salinities (120%, 100%, 80%, 60%, and 40% seawater) at 11°C and 16L:8D photoperiod. K. tunicata and M. hindsii displayed similar trends in percent body weight variation and volume regulatory responses to osmotic stress. However, K. tunicata experienced a significantly higher percent body weight increase than did M. hindsii in response to hypo-osmotic conditions (80%, 60%, and 40% seawater). The mea
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4

Sigwart, J. D. "Phylogeny and evolution of Basal living chitons (mollysca , polyplacophora, lepidopleurida)." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492268.

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The Lepidopleurida is the earliest-derived living group ofpolyplacophoran molluscs (chitons). This group includes 130 living species, distributed worldwide and primarily found in the deep sea; they are small and superficially homogenous in their external morphology. This thesis addresses seven aspects of the biology of these plesiomorphic chitons: (1) Chitons endemic to sunken wood in the South Pacific comprise the most speciose lepidopleuran local fauna. Distribution patterns and faunal composition are examined and five new species are described; (2) The type species ofLeptochiton (and oforde
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5

Shaw, Jeremy Albert. "Biomineralisation processes in the radula teeth of the chiton Acanthopleura hirtosa (Mollusca: Polyplacophora) /." Access via Murdoch University Digital Theses Project, 2007. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20080703.163505.

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6

Harper, Kathryn Dawn. "The ecology of Acanthopleura japonica (mollusca : polyplacophora) : a dominant herbivore on Hong Kong rocky shores /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18038037.

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7

Connors, Matthew James. "Design of a multifunctional biomineralized armor system : the shell of chitons." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/89839.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2014.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 110-121).<br>Nature provides many examples of flexible armor systems which may serve as a source of inspiration for materials scientists and engineers. This thesis explores multiscale material and morphological design principles of the
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8

Chaheen, Mohammad. "Evaluation de la chitine comme nouvelle source d’excipients multifonctionnels pour la formulation et la mise en œuvre par compression directe de comprimés à désintégration rapide." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTG018.

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La demande actuelle croissante d’excipients multifonctionnels par les laboratoires pharmaceutiques, amène les fabricants de matières premières à développer de nouveaux matériaux pouvant répondre à ces critères de performance. Parmi les différents procédés disponibles pour de telles productions, les techniques de co-traitement sont les plus sollicitées. Considérant l’évaluation de la fonctionnalité de différents excipients désintégrants, l’objectif de cette thèse a été de développer un tel excipient, original, économiquement intéressant et pouvant être utilisé dans la fabrication de comprimés p
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9

Pacheco, Lopez Neith Aracely. "Extracción biotecnológica de quitina para la producción de quitosanos : caracterización y aplicación." Thesis, Lyon 1, 2010. http://www.theses.fr/2010LYO10054/document.

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La chitine est l’un des biopolymères les plus abondants dans la biomasse. Son principal dérivé industriel est le chitosane. Ces deux polysaccharides présentent un intérêt croissant en raison de leurs nombreuses propriétés physico-chimiques et biologiques remarquables. Leur utilisation en tant que matériaux est potentiellement intéressante dans de nombreux domaines tels que la pharmacie, la médecine, l’industrie alimentaire et l'agriculture. Malgré de nombreuses avancées dans les méthodes chimiques de production de la chitine et du chitosane, l'utilisation de solutions concentrées d'acides et d
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10

Cadoret, Frederic. "PA 7, souche atypique de Pseudomonas aeruginosa : Etude transcriptomique et caractérisation d'un troisième système de sécrétion de type II fonctionnel, Txc." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4023.

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Pseudomonas aeruginosa est une bactérie pathogène opportuniste qui est caractérisée par son ubiquité et sa grande capacité adaptative. Cette faculté lui est notamment permise par de nombreux systèmes de perception et de régulation, la sécrétion d'un large arsenal d'exoprotéines, une capacité à alterner entre deux modes de vie, une haute résistance naturelle aux antibiotiques ainsi qu'un génome riche soumis à une importante plasticité génomique. Cette dernière, associée aux pressions de sélection exercées par la grande diversité d'environnements rencontrés par P. aeruginosa, a permis l'émergenc
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11

Hogenkamp, David George. "Chitin metabolism in insects : chitin synthases and beta-N-acetylglucosaminidases." Diss., Manhattan, Kan. : Kansas State University, 2006. http://hdl.handle.net/2097/166.

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12

Basso, Lisa. "Assemblage de polymères biomimétique de la cuticule d'insecte pour la modélisation des interactions de surface avec les micro-organismes." Electronic Thesis or Diss., Lyon 1, 2025. http://www.theses.fr/2025LYO10040.

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L’objectif de ce travail est de comprendre et caractériser les interactions entres protéines contenant un domaine de liaison à la chitine (CBD) et le chitosane dans le but d’élaborer une plateforme biomimétique de la cuticule de l’acrostyle des stylets d’hémiptères responsables de la transmission vectorielle non circulante de nombreux phytovirus. Les interactions entre protéines présentant ou non un CBD et des chitosanes de différents degrés d’acétylation (0.5% à 76%) ont été étudiées par microscopie de fluorescence et par microbalance de quartz avec dissipation d’énergie. La première méthode
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13

Frem, Dany. "Catalyse organique énantiosélective par des oligomères bien définis de chitosane." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112292/document.

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Des oligomères de taille définie de chitosane ont été préparés et testés en tant qu'organocatalyseurs dans des réactions d'aldolisation énantiosélectives. Les précurseurs de ces catalyseurs sont obtenus en une seule étape par une réaction d'acétolyse contrôlée de la chitine, second polysaccharide le plus abondant. Une méthodologie reposant sur des réactions de glycosylation sous activation micro-ondes a été développée afin de fonctionnaliser la position anomérique de ces oligomères. Ainsi, le triflate de cuivre(II), utilisé en quantité catalytique, s’est révélé être le promoteur le plus effica
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14

Krčmář, Martin. "Chitosan-glukanový komplex izolovaný ze Schizophyllum commune." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2011. http://www.nusl.cz/ntk/nusl-216803.

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Chitosan-glucan complex is fungal origin copolymer that finds application in medicine and cosmetics. Traditionally mycelium of Aspergillus and Penicillium is considered as industrial chitosan-glucan complex source, though utilization of Micromycetes in biotechnological productions is sometimes undesirable. The aim of the work was to study the possibility of Basidiomycete Schizophyllum commune submerged cultivation for industrial scale chitosan-glucan complex production use. Within the work there was studied effect of cultivation conditions (type and concentration of carbon sources in nutrient
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15

Trdá, Lucie. "Identification et caractérisation du récepteur à la flagelline (VvFLS2) et recherche du récepteur aux chito-oligosaccharides chez la vigne." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS028/document.

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Les récepteurs PRR (Pattern-recognition receptors) jouent un rôle clé dans l’immunité des plantes en assurant la reconnaissance d’éliciteurs, des motifs moléculaires associés aux microorganismes (MAMP) qui témoigne de leur présence microbienne. La perception de ces MAMPs constitue le premier système de détection d’agents potentiellement pathogène, et déclenche des mécanismes de défense qui ont pour but de bloquer leur développement.Cette étude met en lumière comment la vigne (Vitis vinifera) perçoit deux MAMPs : le peptide flg22 dérivé de la flagelline et la chitine, des motifs conservés exist
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16

Evans, Louise Anne. "Biomineralization in the radular teeth of the chiton Acanthopleura hirtosa." Thesis, Evans, Louise Anne (1991) Biomineralization in the radular teeth of the chiton Acanthopleura hirtosa. PhD thesis, Murdoch University, 1991. https://researchrepository.murdoch.edu.au/id/eprint/51996/.

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The mineralized major lateral teeth of the chiton, Acanthopleura hirtosa have been studied to elucidate both the structural organization and chemical nature of the organic matrix and to extend the characterization of the major biominerals present within the teeth. Light and electron microscopic examination of the tooth ultrastructure has shown that the organic matrix consists of a complex architectural arrangement of fibres which differs according to the particular biomineral which will be eventually deposited with it. In the posterior (magnetite-mineralized) region of the tooth relatively
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17

Beaney, P. D. "The enzymatic deacetylation of chitin." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.446139.

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18

Montroni, Devis <1991&gt. "Hierarchically organized chitin-based matrices." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amsdottorato.unibo.it/9157/1/Montroni_Devis_tesi.pdf.

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Chitin is the second most abundant biopolymer on Earth and the most diffused across the known species, being present in more than 70 % of them. It is present in a huge variety of different structures and morphologies being a massive pool of information for new material science approach. This thesis aims to study chitin at different level of organization using diverse approaches. Three main topics are discussed in this manuscript. The first is the use of a bottom-up approach to study chitin nanofibrils self-assembly in water triggering the assembly by pH increment. Successively, the assembly wa
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19

Lord, Joshua Pratt 1986. "Modeling of Life History Strategies in Organisms with Indeterminate Growth, with a Focus on the Distribution and Life History of the Gumboot Chiton Cryptochiton stelleri." Thesis, University of Oregon, 2010. http://hdl.handle.net/1794/10827.

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xii, 148 p. : ill. A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.<br>The gumboot chiton Cryptochiton stelleri is the largest intertidal invertebrate herbivore on rocky shores in the Pacific Northwest. This study documented the larval development, metamorphosis, distribution and life history of this species. Growth rings in valves of Cryptochiton stelleri and Katharina tunicata were used to determine age and showed life spans of at least 40 years for C. stelleri and 17 years for K. tunicata. Field surveys in
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20

Latil, de Ros Derek. "Microalgae as a new source of chitosans." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/402113.

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Chitosans are a family of linear polysaccharides generally obtained from the chemical deacetylation of chitin derived from crustacean shells that have been reported to have a wide range of bioactivities. However, the development of products taking advantage of these bioactivities has lagged behind expectations. The historic main reason is the poor reproducibility of the biological effects of chitosans due to a harsh chemical deacetylation process that impairs the structure of the polysaccharides inducing variability. Another reason is the immunologic responses that these polymers may produce i
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21

Vold, Inger Mari Nygård. "Periodate oxidised chitosans : structure and solution properties." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-897.

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<p>Chitosans are considered promising for a wide range of applications, and especially in the biomedical and pharmaceutical field numerous possible applications are being investigated. However, some of the properties of chitosans are not ideal for biomedical applications. Most high molecular weight chitosans are insoluble near and above physiological pH, limiting its uses. Moreover, the relatively high stiffness of chitosan chains restricts their electrostatic interactions with polyanions. To overcome this problem, chemical modification is an important approach.</p><p>The main objective of thi
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22

Badreddine, Ilham. "Etude des surfaces cellulaires d'Aphanomyces euteiches, parasite majeur de légumineuses." Toulouse 3, 2008. http://thesesups.ups-tlse.fr/463/.

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Les oomycètes sont de redoutables agents pathogènes pour les plantes cultivées et les pertes annuelles occasionnées par ces organismes sont considérables. Parmi eux, Aphanomyces euteiches est responsable de pourritures racinaires chez diverses légumineuses. Une étude des surfaces cellulaires et du sécrétome d'A. Euteiches a été entreprise dans le cadre de ce travail. Elle a permis l'identification de trois protéines dans le sécrétome, prédites comme possédant chacune une activité enzymatique différente, qui devront faire l'objet d'études fonctionnelles. Alors que les oomycètes sont considérés
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23

Leclerc, Philippe. "Caractérisation microbiologique des composts à base de résidus chitineux." Sherbrooke : Université de Sherbrooke, 1997.

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24

Côté, Nathalie. "Impact agronomique de l'application de composts à base de résidus chitineux." Sherbrooke : Université de Sherbrooke, 1999.

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25

Labrie, Cinthia. "Recherche sur les propriétés phytoprotectrices de composts de résidus chitineux." Sherbrooke : Université de Sherbrooke, 1999.

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26

Nicholas, Todd Andrew. "Antimicrobial Use of Native and Enzymatically Degraded Chitosans for Seafood Applications." Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/NicholasTA2003.pdf.

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27

Griffith, Ashleigh Margaret Rose. "Synthetic receptors for cellulose and chitin." Thesis, University of Bristol, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.723467.

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28

Cofie, Daniel Quarcoopome Guthrie Rufus K. "Effect of chitin on Vibrio cholerae /." See options below, 1988. http://proquest.umi.com/pqdweb?did=746612041&sid=1&Fmt=2&clientId=68716&RQT=309&VName=PQD.

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29

Sturz, Helen Caroline. "Anaerobic decomposition of chitin in sediments." Thesis, Queen Mary, University of London, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267108.

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30

Agboh, Ochayi Christopher. "The production of fibres from chitin." Thesis, University of Leeds, 1986. http://etheses.whiterose.ac.uk/11256/.

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31

Macdonald, Charlotte. "The digestion of chitin by callitrichids." Thesis, Edinburgh Napier University, 2011. http://researchrepository.napier.ac.uk/Output/6654.

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Studies of wild callitrichids reveal limited data about their complex diets. As insectivorous primates it is likely that they can digest chitin. Using the common marmoset, Callithrix jacchus, as a model, this study assessed chitin digestibility and whether or not a variety of zoo-housed callitrichid species display a preference for particular insect types. The presence of chitinolytic microorganisms in the faeces of Goeldi's monkey, Callimico goeldii, was investigated using both culture-based and molecular techniques and a preliminary evaluation of the faecal bacterial population was made. The
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32

Tasselli, Delteil Amandine. "Rôle des Wall-Associated kinases et dautres régulateurs dans la résistance du riz au champignon responsable de la pyriculariose, Magnaporthe oryzae." Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20178.

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La pyriculariose, maladie causée par le champignon phytopathogène Magnaporthe oryzae, affecte gravement le riz qui constitue l'aliment de base de plus de la moitié de la population mondiale. La connaissance des mécanismes de résistance est nécessaire pour guider la sélection variétale. Au cours de ce travail, une synthèse de la littérature a permis de recenser plus de 60 gènes régulateurs du riz impliqués dans la résistance du riz à différents agents pathogènes. Nous avons complété ces données en étudiant le rôle in planta de huit de ces régulateurs. Un rôle central du facteur de transcription
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Strand, Sabina P. "Interactions between Chitosans and Bacteria : Flocculation and Adhesion." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-108.

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34

Devel, Laurent. "Vers la synthese d'inhibiteurs de la chitine synthase." Paris 6, 2000. http://www.theses.fr/2000PA066138.

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Dans le cadre de l'etude du mecanisme de la chitine synthase, une n-acetylglucosaminyltransferase qui biosynthetise la chitine a partir de l'udp-glcnac, nous avons envisage la synthese d'analogues de l'etat de transition. En nous appuyant sur le mecanisme des glycosidases, nous avons suppose le passage par un intermediaire oxycarbenium et nous avons choisi de generer des composes en serie n-acetylxylosamidine ou n-acetylxylosamidoxime. Dans un premier temps, nous avons realise la synthese, en 10 etapes, d'un xylonolactame a partir de l'aldehyde de garner, porteur d'un premier centre asymetriqu
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BRUGNEROTTO, JOEL. "Contribution a l'etude des chitines et des chitosanes." Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10134.

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Le chitosane est obtenu par desacetylation de la chitine, qui est le deuxieme polysaccharide naturel le plus abondant sur terre apres la cellulose. Tout d'abord, nous avons determine le degre d'acetylation (da) de nombreux echantillons de chitines et chitosanes par rmn 1h, rmn 1 3c et 1 5n cp-mas, et spectroscopie infrarouge (ir) dans toute la gamme de da. Nous avons propose une correlation entre les resultats obtenus par ir a partir du rapport d'absorbance a1320cm 1/a1420cm 1 et les da obtenus par rmn. Une premiere etude de la repartition des differentes unites constitutives le long de la cha
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Freville, Marie-Christine. "Contribution de l'utilisation de la chitine en cosmétologie." Paris 5, 1990. http://www.theses.fr/1990PA05P140.

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37

Hoßbach, Janina [Verfasser], and Bruno M. [Akademischer Betreuer] Moerschbacher. "Heterologous production and characterization of chitin deacetylases with chitin binding domains / Janina Hoßbach ; Betreuer: Bruno M. Moerschbacher." Münster : Universitäts- und Landesbibliothek Münster, 2015. http://d-nb.info/1139361589/34.

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Shrestha, Binesh. "Production de chitine deacetylase hétérologue chez la levure Pichia pastoris en vue de transformer la chitine en chitosan par un bioprocédé." Paris 11, 2004. http://www.theses.fr/2004PA112059.

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La chitine est produite en quantité importante dans la biosphère. Elle existe dans les squelettes externes des Arthropodes (crustacés et insectes) et dans la paroi des champignons. La forme deacétylée, appelée chitosan, est rare dans la nature. Cependant, il s'agit d'un produit très interessant pour la médicine, l'agriculture et pour plusieurs branches de l'industrie (pharmacie, cosmétique, traitement des eaux, microélectronique). La production mondiale actuelle de chitosan est très faible et peu rentable sur le plan commercial. Le chitosan du commerce est traditionellement produit par déacéty
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au, jeremy shaw@uwa edu, and Jeremy Shaw. "Biomineralisation processes in the radula teeth of the chiton Acanthopleura hirtosa (Mollusca: Polyplacophora)." Murdoch University, 2007. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20080703.163505.

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A detailed row by row investigation of major lateral tooth cusp mineralisation, together with the concomitant development of the superior epithelial tissue surrounding the teeth of the chiton Acanthopleura hirtosa has been undertaken using a combination of light microscopy, and scanning and transmission electron microscopy. A holistic approach has been adopted that encompasses observations over a range of spatial scales, from whole radula mineralisation processes to those occurring within individual tooth cusps at various stages of development. In addition, mineralisation in radulae from fresh
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40

Shaw, Jeremy. "Biomineralisation processes in the radula teeth of the chiton Acanthopleura hirtosa (Mollusca: Polyplacophora)." Thesis, Shaw, Jeremy (2007) Biomineralisation processes in the radula teeth of the chiton Acanthopleura hirtosa (Mollusca: Polyplacophora). PhD thesis, Murdoch University, 2007. https://researchrepository.murdoch.edu.au/id/eprint/306/.

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A detailed row by row investigation of major lateral tooth cusp mineralisation, together with the concomitant development of the superior epithelial tissue surrounding the teeth of the chiton Acanthopleura hirtosa has been undertaken using a combination of light microscopy, and scanning and transmission electron microscopy. A holistic approach has been adopted that encompasses observations over a range of spatial scales, from whole radula mineralisation processes to those occurring within individual tooth cusps at various stages of development. In addition, mineralisation in radulae from fresh
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41

Shaw, Jeremy. "Biomineralisation processes in the radula teeth of the chiton Acanthopleura hirtosa (Mollusca: Polyplacophora)." Shaw, Jeremy (2007) Biomineralisation processes in the radula teeth of the chiton Acanthopleura hirtosa (Mollusca: Polyplacophora). PhD thesis, Murdoch University, 2007. http://researchrepository.murdoch.edu.au/306/.

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A detailed row by row investigation of major lateral tooth cusp mineralisation, together with the concomitant development of the superior epithelial tissue surrounding the teeth of the chiton Acanthopleura hirtosa has been undertaken using a combination of light microscopy, and scanning and transmission electron microscopy. A holistic approach has been adopted that encompasses observations over a range of spatial scales, from whole radula mineralisation processes to those occurring within individual tooth cusps at various stages of development. In addition, mineralisation in radulae from fresh
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42

Mei, Zhenying. "Valorisation des insectes comme source alternative de chitine et de chitosane pour les applications d'élimination des polluants et la bio-impression 3D." Electronic Thesis or Diss., Université Côte d'Azur, 2024. https://theses.hal.science/tel-04885373.

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La chitine et le chitosane présentent un potentiel considérable pour de nombreuses applications dans divers domaines, notamment la biotechnologie, l'ingénierie, l'agriculture, l'industrie alimentaire, les sciences de l'environnement, etc., en raison de leurs propriétés distinctives et de leur capacité d'adaptation. La chitine est un polysaccharide linéaire composé d'unités de N-acétylglucosamine (GlcNAc) liées en β-(1-4). Le chitosane est obtenu par désacétylation partielle de la chitine via l'élimination des groupes acétyles des unités GlcNAc. Le degré de désacétylation détermine l'étendue de
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Maillard, Francois. "Rôle des communautés microbiennes dans la dégradation de la matière organique en forêt dans un contexte d'exportation intense de biomasse." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0190/document.

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En Europe, le bois est la première source d’énergie renouvelable. La transition énergétique se traduit par une intensification de l’exploitation des forêts. L’effet de ces pratiques sylvicoles sur les communautés microbiennes du sol est encore peu étudié. Au cours de ma thèse, j’ai évalué les conséquences d’une manipulation artificielle de matière organique en forêt tempérée sur la diversité fonctionnelle et taxonomique des communautés bactériennes et fongiques telluriques dans six sites expérimentaux (réseau expérimental MOS). Parallèlement, une caractérisation fonctionnelle des communautés m
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Lizardi-Mendoza, Jaime. "Structured porous materials of chitin and chitosan." Thesis, Queen's University Belfast, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486244.

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Chitin is an abundant polysaccharide that is mainly found in the exoskeleton of arthropods (insect, crustaceans, etc.). It is chemically and structurally similar to cellulose but chitin has an acetamido group in the second position: Chitosan, the main derivative ofchitin, is deacetylated leaving the amide groups uncovered and liable to be protonated in acid environments. These together with other features provide chitin and chitosan with a range of distinctive functional properties that including structural qualities, adsorption capacity, reactivity, biocompatibility, bioactivity and biodegrad
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Meanwell, Richard J. L. "Streptomycin production from chitin using Streptomyces griseus." Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/12949.

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The production of streptomycin using Streptomyces griseus using two types of chitin as a substrate was studied using a variety of fermentation techniques. Commercial chitin was obtained (Sigma) and comprised chemically purified crab shell. Pre-fermented chitin was the solid product from the lactic acid fermentation of shrimp waste using Lactobacillus paracasei A3. Bioassay, HPLC and FTIR methods were developed during this project for the quantification of streptomycin both in liquid phase and adsorbed on solid chitin surfaces. Shake flask experiments were carried out to determine basic product
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Schofield, David Alexander. "Regulation of chitin synthesis in Candida albicans." Thesis, University of Aberdeen, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259699.

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The study of the regulation of chitin synthesis in the pathogen <i>Candida albicans</i> is a challenging field. It not only offers a possibility of a better understanding of the dimorphic transition but also may help in the development of an effective antifungal. The suggestion that the regulation of cell wall synthesis may be closely coupled to the turgor pressure of the fungus has been investigated. The synthesis of chitin by the enzyme chitin synthase was studied under conditions of osmotic stress. Mixed membrane fractions from protoplasts of <i>C.albicans</i> incubated in medium of low osm
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Pauw, Marina. "Chitin synthesis in response to environmental stress." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86435.

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Thesis (MSc)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Previous studies have indicated that fermentation with yeast strains whose cell walls contain higher chitin levels may lead to reduced wine haze formation. In order to adjust cell wall chitin levels, more information on the regulation of chitin synthesis in wine-relevant yeast is required. Yeast cells are known to increase chitin levels when subjected to certain environmental changes such as an increase in temperature. The main aim of this project was to investigate chitin accumulation and synthesis in wine yeast strains when ex
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Mohd, Nawawi Mohd Ghazali. "Pervaporation dehydration of isopropanol-water systems using chitosa membranes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21370.pdf.

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Čivilienė, Loreta. "Dažų adsorbcijos krabų chitinu ir chitozanu kinetika bei pusiausvyra." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2005. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2005~D_20050613_155842-55308.

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Chitin, chitosan recovered from fly crabs shells have been investigated by the elemental analysis, potentiometric titraton and FT–IR spectrometry methods. The molecular weght of chitosan was determined by measuring their viscosity. The adsorption kinetics of reactive dye and equilibrium conditions has been investigated. The adsorption of reactive dye on chitin and chitosan proceeds according to pseudo – second – order kinetic equation. Adsorption investigations under equilibrium conditions showed that. Theses results were fitted by both Langmuir and Freudlich models.
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Shillito, Bruce. "Morphogenese de la chitine du tube de riftia pachyptila." Paris 6, 1994. http://www.theses.fr/1994PA066804.

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Le vestimentifere geant riftia pachyptila est un ver tubicole qui peuple les ecosystemes hydrothermaux profonds. Son tube est en partie compose d'une variete rare de chitine, la chitine. La chitine est le polysaccharide structural le plus repandu dans le monde du vivant apres la cellulose. Des investigations ultrastructurales du systeme de secretion de chitine de cet animal revelent des differenciations originales a plusieurs echelles: tissulaire (glandes de secretion), cellulaire (cellules secretrices), et sub-cellulaire (microvillosites synthetisant les microfibrilles de chitine). C'est la p
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