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- W2010240089 abstract "We analyse the dynamics of a network of regularly spaced parallel filaments, growing perpendicularly against an elongating membrane which limits the diffusion of monomers in the half-space where filaments grow. When the membrane bulges, some filaments spread, so that less monomers are absorbed at the bulge periphery. It results in both a local increase of the free monomer concentration and an enhancement of the filament polymerisation rate, leading to an original growth instability. This one, stabilised here at short wavelengths by filament tip diffusion along the membrane and the drawback force exerted by a subjacent network of crosslinking molecules, may play a noticeable part in the initiation of neuritic and lamellipodial structures. Nous étudions la dynamique d'un réseau de filaments parallèles régulièrement espacés, croissant perpendiculairement à une membrane qui s'allonge, et qui limite la diffusion de monomères dans le demi-espace où les filaments croissent. Lorsque la membrane forme une protusion, des filaments s'écartent, si bien que moins de monomères sont absorbés à la phériphérie de cette déformation. Il en résulte une élévation locale de la concentration en monomères libres ainsi qu'une augmentation de la vitesse de polymérisation des filaments conduisant à une nouvelle instabilité de croissance. Celle-ci, stabilisée ici aux petites longueurs d'onde par la diffusion membranaire des pointes des filaments ainsi que par la force de rappel d'un réseau sous-jacent de molécules de liaison, peut jouer un rôle notable dans la formation des structures neuritiques et lamellipodiales." @default.
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- W2010240089 date "2001-08-01" @default.
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- W2010240089 title "Unstable membrane outgrowth induced by filament tip spreading" @default.
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- W2010240089 doi "https://doi.org/10.1016/s1296-2147(01)01211-2" @default.
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