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Featured researches published by eonardi L.


Journal of Anatomy | 1998

Collagen fibril arrangement and size distribution in monkey oral mucosa

Vittoria Ottani; Marco Franchi; V. De Pasquale; Leonardi L; M. Morocutti; Alessandro Ruggeri

Collagen fibre organisation and fibril size were studied in the buccal gingival and hard palate mucosa of Macacus rhesus monkey. Light and electron microscopy analysis showed connective papillae exhibiting a similar inner structure in the different areas examined, but varying in distribution, shape and size. Moving from the deep to surface layers of the buccal gingival mucosa (free and attached portions), large collagen fibril bundles became smaller and progressively more wavy with decreasing collagen fibril diameter. This gradual diameter decrease did not occur in the hard palate mucosa (free portion, rugae and interrugal regions) where the fibril diameter remained constant. A link between collagen fibril diameter and mechanical function is discussed.


Journal of Ultrastructure Research | 1983

Light microscopy, electron microscopy, and X-ray diffraction analysis of glycerinated collagen fibers.

Leonardi L; Alessandro Ruggeri; Norberto Roveri; A. Bigi; E. Reale

Light microscopy, transmission electron microscopy (freeze-fracture replicas and thin sections), and X-ray diffraction techniques were used to investigate the structure of rat tail tendon collagen fibers subjected to one of the following treatments: water, phosphate buffer, glutaraldehyde, glutaraldehyde followed by glycerol, glycerol, and glycerol followed by phosphate buffer. As seen by light microscopy, only treatment with glycerol induces a remarkable swelling of the native (untreated) collagen specimens. Replicas and thin sections show that this swelling is due to an expansion of the interfibrillar space, and to a dissociation of the collagen fibrils into microfibrils. X-Ray diffraction analysis reveals great disorder in the glycerol-swollen collagen fibers. However, this does not appreciably involve the microfibrillar and molecular structure. Light and electron microscopy as well as X-ray diffraction techniques show that the collagen fiber swelling induced by glycerol is an almost completely reversible process.


Connective Tissue Research | 1983

THE BANDING PATTERN OF RAT TAIL TENDON FREEZE-ETCHED COLLAGEN FIBRILS?

Marchini M; M. Morocutti; Castellani Pp; Leonardi L; Alessandro Ruggeri

Banding patterns of freeze-etched and replicated rat tail tendon collagen fibrils were studied. Better banding definition was obtained by freezing the samples without using a cryoprotectant and by prolonging etching. Under these conditions, the banding pattern was characterized by a sequence of elevated and depressed segments with a D-period of 65 nm, by two ridges at the margins of the elevations and by a third ridge at an intermediate point in the depressions. A comparison between replicas and isolated negatively stained collagen fibril micrographs as well as densitometric determinations have allowed interpretation of the elevations and depressions as overlap and gap zones and of the three ridges as the main bands with higher molecular density. Estimates, carried out on densitometric diagrams obtained from replicas, gave values which may represent a new parameter in the study of collagen banding and led to the calculation of a 0.55 D long gap zone and of a 0.45 D long overlap zone.


Micron | 2005

Biological fixation of endosseous implants

Marco Franchi; Milena Fini; D. Martini; Ester Orsini; Leonardi L; Alessandro Ruggeri; Gianluca Giavaresi; Vittoria Ottani


Journal of Anatomy | 1985

Ultrastructural aspects of rat tail tendon sheaths.

R. Strocchi; Leonardi L; Stefano Guizzardi; Marchini M; Alessandro Ruggeri


Journal of Biological Chemistry | 1984

Phospholipid-enriched bacterial chromatophores. A system suited to investigate the ubiquinone-mediated interactions of protein complexes in photosynthetic oxidoreduction processes.

Rita Casadio; Giovanni Venturoli; A Di Gioia; Castellani Pp; Leonardi L; Bruno Andrea Melandri


Connective Tissue Research | 1986

“In Vitro” Fibril Formation of type I Collagen from Different Sources: Biochemical and Morphological Aspects

Maurizia Valli; Leonardi L; R. Strocchi; Ruggero Tenni; Stefano Guizzardi; Alessandro Ruggeri; Cesare Balduini


Basic and applied histochemistry | 1987

Evidence for basement membranes in rat tail tendon sheaths.

Stefano Guizzardi; Jean-Michel Foidart; Leonardi L; R. Strocchi; Alessandro Ruggeri


Bollettino della Società italiana di biologia sperimentale | 1980

Role of the orientation of the collagen fibers on the mechanical properties of the carotid wall

A. Bigi; Incerti A; Leonardi L; Miccoli G; Re G; Norberto Roveri


Bollettino della Società italiana di biologia sperimentale | 1982

Ultrastructural findings on collagen fibers of tendon sheaths from the rat tail

Leonardi L; R. Strocchi; Castellani Pp; Stefano Guizzardi; Ottani

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A. Bigi

University of Bologna

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