The dental pathology of feral cats on Marion Island, part II: periodontitis, external odontoclastic resorption lesions and mandibular thickening.

Skulls (n = 301) of adult feral cats from Marion Island were examined macroscopically. Dental calculus was found infrequently (9.0% of cats, 0.

The dental pathology of feral cats on Marion Island, part I: congenital, developmental and traumatic abnormalities.

Skulls (n = 301) of adult feral cats from Marion Island, a sub-Antarctic island, were examined macroscopically. Congenital anomalies, which were rare, included a few supernumerary premolars, located mesially to those normally present. Supernumerary roots, mainly of the maxillary third premolar, were found in just over 10% of cases.

Morphological effects of the catecholestrogens on cells of the seminiferous tubules of Sprague-Dawley rats.

Estradiol-17 beta (E2) and the two catecholestrogens 2-OHE2 and 4-OHE2, when daily administered at low doses of 10-40 ng/rat, were cytotoxic to the seminiferous epithelium. The structural changes seen after seven days exposure included abnormal meiotic type II cells with uneven chromosome distribution, the formation of binucleated and multinucleated giant cells, of which many were sloughed into the lumina of the seminiferous tubules. The effect of the 4-OHE2 metabolites were always more pronounced that that of 2-OHE2 or E2.