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, Détermination de la zone d'analyse selon Z

. .. Critère-d'otsu,

. .. Epaisseur-du-biofilm,

. .. Taux-de-couverture,

Y. Biofilm-constitué-de-bactéries,

, Etude de l'épaisseur, de l'occupation et de la densité

. .. Etude-des-domaines,

. .. Nps-sinh2,

, Etude de l'épaisseur, de l'occupation et de la densité

. .. Etude-des-domaines,

, Biofilm constitué de bactéries YeeJ (E2551) en présence de 0,4 g.L -1 de NPs SiCOOH, vol.189

, Etude de l'épaisseur, de l'occupation et de la densité

. .. Etude-des-domaines,

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. L'une-d-;-birjiniuk, entre elles serait que la matrice du biofilm forcerait une promiscuité, 2014.

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. Majdalani, De plus, la quantité importante de NPs présentes en solution (0,4 g.L -1 soit d'une bio-couronne composée de protéine YeeJ, ce qui aurait pour effet de favoriser l'agrégation des NPs. De plus, la matrice du biofilm, provenant de l'excrétion de biomolécules par les bactéries sous l'effet de stress extérieur (Flemming and Wingender 2010), peut modifier les propriétés de surface des NPs, NPs. Ces NPs arborent donc des groupements NH2 (2 groupes par nm 2 ) et des groupements OH. Ainsi, la promiscuité induite par la matrice du biofilm entrainerait une agrégation des NPs SiNH2 entre elles et avec les bactéries, 2005.

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S. Le-chapitre, généré en présence de SiNH2, présente d'une part des zones vides et d'autre part des zones constituées d'agrégats de NPs et de bactéries. Des cheminées sont visibles depuis la partie « basale » du biofilm et s'étendent vers la partie « supérieure ». Si l'on omet la hauteur de ces cheminées, l'épaisseur du biofilm est d'une valeur comparable à celui constitué de bactéries YeeJ (E2551) seules. Les conditions de culture du biofilm sont telles que les bactéries et les NPs présentent une charge négative, plus exploratoire, a été consacré à l'étude d'images 3D de biofilms bactériens issus de la souche YeeJ (E2551), générés ou non en présence de NPs

, Cette structure particulière du biofilm pourrait provenir de la tendance à l'agrégation des NPs SiNH2 pour une force ionique élevée (ici ca. 100 mM), de la présence de la protéine YeeJ

, La structure plus « aérienne » de ce biofilm pourrait s'expliquer par le fait que les NPs SiCOOH restent dispersées malgré une force ionique importante. Des interactions électrostatiques répulsives pourraient se produire entre ces NPs, les bactéries et les constituants de la matrice du biofilm, ce qui aurait pour conséquence le déplacement des NPs SiCOOH vers la partie « supérieure

, présentant une surface fonctionnalisée, et des bactéries E. coli, possédant différents types de biostructures de surface, l'utilisation de l'électrophorèse a montré son potentiel de détection des signatures de modifications des structures, en conséquence des interactions NPs/bactéries. L'AFM a également montré son intérêt pour permettre l'observation, en détails et à l'échelle de la cellule unique, ces modifications structurales

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