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The microstructure of a Lucanidae cuticle was observed with a scanning electronic microscope (SEM). It was found that the insect cuticle is a kind of bio composite consisting of nanometer chitin fibers and sclerotic-protein matrix. There is a kind of isogonic nano-chitin-fiber structure in the cuticle, in which the fibers in different layers have different orientations, which may improve the fracture...
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