Daniela E Quacci

Learn More
Morphological, histochemical and ultrastructural investigations on epiphyseal apparatus of Rana Esculenta were made. The most important findings were the following: 1) metaphyseal cartilage is localized inside proximal diaphyseal compact bone as a plug; 2) metaphyseal cartilage do not reduce in thickness during ageing; 3) metaphyseal cartilage do not show(More)
Transformation of osteoblasts into osteocytes is marked by changes in volume and cell shape. The reduction of volume and the entrapment process are correlated with the synthesis activity of the cell which decreases consequently. This transformation process has been extensively investigated by transmission electron microscopy (TEM) but no data have yet been(More)
A histological study on the tissue of nonunion of tibias of two young patients was performed to evaluate the ability of cells to start the mineralization of the matrix. The observations can be summarized as follows: 1) Tissue vessels often appear occluded by thrombotic material; 2) Fibroblasts and chondrocytes found in the nonunion tissue seemed normal,(More)
The intercellular matrices of bovine nasal cartilage, chick embryo perichordal cartilage and chick embryo mesenchymal cells culturedin vitro have been examined by electron microscopy after staining them with Alcian Blue in salt solutions according to Scott & Dorling (1965). Matrix granules, which are typical components of cartilage at the ultrastructural(More)
Light- and electron-microscopic investigations were performed on two failed Dacron ligaments that had been removed from 2 patients shortly after failure of the implant 2-3 years after reconstruction of the anterior cruciate ligament. Two different cell populations and matrices were correlated with closeness to the Dacron threads. Fibroblasts surrounded by(More)
The current model of compact bone is that of a system of longitudinal (Haversian) canals connected by transverse (Volkmann's) canals. Models based on histology or microcomputed tomography lack the morphologic detail and sense of temporal development provided by direct observation. Using direct scanning electron microscopy observation, we studied the bone(More)
The effects of laser irradiations have been estimated both from the clinical point of view (rate of reduction of the ulcerated area) and in ultrastructural terms. The modification produced by laser in human fibroblasts in culture have also been investigated. Under our clinical and experimental conditions, laser stimulates the secretion of fibroblasts, both(More)
Primary osteoma cutis arises in the deeper dermis for no apparent reason and presents as mature, lamellar, and osteonic bone; secondary cutaneous osteomas are correlated with inflammatory processes, scars, or dysembryoplasia and are always composed of osteoid. Ultrastructural findings of primary cutaneous osteomas have not been reported to date. Light and(More)