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Enamel contains calcium phosphate in a crystalline form; it is the hardest biologically manufactured substance, and is produced by ameloblasts prior to tooth eruption. The aim of the present study was to evaluate the morphology of the enamel prisms and their relationship to Hunter-Schreger bands in the dog canine and molars teeth by polarization microscopy. The photomicrographs were analyzed with Fourier spectral analysis. The results suggest that the Hunter-Schreger bands (parazones and diazones) were thicker in the canine teeth in comparison to the molar teeth. However, the prisms of the diazones of the canine teeth were thinner.
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We aimed to verify how granule cells of two post-natal ages (6 and 10 days) modify quantitatively and whether their parameters get close to those of a younger age (2 months) of an adult age spectrum already studied. In semithin sections, we estimated the mean volume (V N ) of the nucleus using the r
The forelimbs in maniraptoran theropods are strongly modified to suit the different hunting style in those dinosaurs. Aim of this work is to propose a model of the forelimb function in specialized theropods such as Deinonychus or Velociraptor. The presence of several characters, such as the furcula,