Biomedical subjects

E Giannessi

Publications and source records attributed to E Giannessi.

4 recordsLinked to original sources

PubMed2002

Comparative analysis of senescent exorbital lacrimal glands in male and female albino rats.

In our previous study we described a bilateral-macroscopic and structural dimorphism of young rat exorbital lacrimal gland (Loewenthal's gland), which was the probable cause of the bibliographic discrepancies in the entity and the onset of its sexual dimorphism. Relevant literature also reported sex-dependent alterations in gland structure during senescence. The present study aims to carry out a comparative analysis on age-dependent changes in glands of both sides from male and female rats, using histological, histochemical and transmission electron microscopy, to evaluate whether the gland bilateral-macroscopic and structural dimorphism might influence the kind of alterations which occur in senescence. Our findings indicate that the macroscopic and structural side-specific dimorphism is not so evident in comparison with young rats. The side-specific dimorphism is evident only in male rats, in which the roundish gland appears to be more Sudan-positive in comparison with the ellipsoidal gland. The gland bilateral-macroscopic and structural dimorphism, although more evident in comparison with young animals, does not seem to influence these kinds of alterations due to senescence, a time-window in which we still observed some sexual differences also in more aged rats.

Aging↗

PubMed2001

Expanded polytetrafluoroethylene as tendon replacement: an experimental study in chickens.

We designed an experimental animal model (in chickens) to assess the potential applications, above all in hand surgery, of an expanded polytetrafluoroethylene (e-PTFE) graft as a replacement for a natural tendon. The results of macroscopic, histological, and functional observations made five weeks, and three, four, five, and six months after implantation showed that the e-PTFE seemed to be a good replacement for tendons, because it integrated well with surrounding tissue and permitted good functional recovery within a reasonable time period.

Animals↗

PubMed1995

A morphological and morphometrical study of displaced amacrine cells in dog retina.

The morphology and morphometry of displaced amacrine cells (DACs) have been investigated in dog retina with the aim of finding out differences in relation to their distance from the optic papilla and to their location within the nasal and temporal retina. The study was performed by using the Boycott and Peichl's silver impregnation method in wholemount retina (12) while the morphometry of the cell body and of the dendritic field was carried out by Leitz ASM 68K image analyser. No morphological difference was found between nasal and temporal cells although a variability, sometimes significative, in their morphometry was observed. Moreover, the morphological features of the DACs remained constant even by varying their distance from the optic papilla.

Animals↗

PubMedDate not supplied

Localization, morphology and ultrastructure of taste buds in the domestic duck (Cairina moschata domestica L.) oral cavity.

The Authors report on localization of the taste buds in epithelium of the palate (70%), the floor of the oral cavity (28%) and the tongue (2%) in Domestic Duck. Each taste bud is oval-shaped, measuring roughly 130 x 60 microm, and communicates with the oral cavity by a short duct. There is topographical correspondence between the buds and the parietal salivary glands. Ultrastructural examination showed the following 4 cell types: 1) light cells--characterized by cytoplasm containing sparse perinuclear filaments, numerous light vesicles, a uniformly granular nucleus. 2) dark cells--with electron-dense cytoplasm, numerous perinuclear filaments, occasional light vesicles, an irregular and densely granular nucleus. 3) intermediate cells--with characteristics common to the two previous cell types. 4) basal cells--located at the ventral part of the button.

Animals↗