Iridescence of a marine bacterium, Cellulophaga lytica : physical, microbiological and ecological characterizations ; Etude de l'iridescence d'une bactérie marine, Cellulophaga lytica : caractérisation physico-optique, microbiologique et écologique
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Media type:
E-Book
Title:
Iridescence of a marine bacterium, Cellulophaga lytica : physical, microbiological and ecological characterizations ; Etude de l'iridescence d'une bactérie marine, Cellulophaga lytica : caractérisation physico-optique, microbiologique et écologique
Published:
[Erscheinungsort nicht ermittelbar]: HAL CCSD, 2012
Language:
French
Origination:
University thesis:
Dissertation, HAL CCSD, 2012
Footnote:
Description:
During collections in the marine environment, colony with bright coloration under direct illumination was isolated. Colors were similar to butterly iridescence. Iridescence is a property of structural color where periodic nanoscopic structures are responsible of intense coloration. Bacterial iridescence is poorly described in the literature. In this work, we aimed to characterize the phenomenon by physico-optical, microbiological and ecological analysis. The marine bacterium was identified as Cellulophaga lytica.In the first experiment we illustrated and proved the physical color by micro spectrophotometry. Comparison with diverse bacteria permitted to demonstrate the uniqueness of C. lytica iridescence, named glitter-like". We proposed the first classification of iridescences within the prokaryotes. Others Bacteroidetes strains showed "glitterlike"iridescence effects. A link between iridescence and gliding motility was additionally identified. A biotic factors demonstrated conservation of the phenomenon under conditions that mimic C. lytica stressing biotope. Moreover,other iridescent marine strains were isolated. They were particularly associated to macroalgae (red, brown),mollusks, cnidarians and seawater. Biological and ecological functions of iridescence are then supposed. By using transmission electron microscopy and modeling, structures responsible for iridescence in the colony were first identified: alligned and equidistant cells at a population level.Bacterial iridescence's fundamental and technical skills are described in this thesis. Applications could lead to biomimetic and nanotechnology of iridescent structures.