[Study of Y-chromatin in the buccal epithelium of man]

Investigation was carried on by fluorescent-microscopic technique, smears of buccal epithelium being stained with acrichinium-mustard gas. The extent, form, location in a nucleus and the frequency of Y-chromatin in human buccal smears were studied. In medico-genetic practice this method is employed for initial determination of chromosome sex in disease associated with anomalies of sex chromosomes.

Ultrastructural study of focal epithelial hyperplasia

Biopsy material from two young Israeli patients with focal epithelial hyperplasia revealed acanthosis, papillomatosis, and the presence of many epithelial cells with a clear cytoplasm in the basale and stratum spinosum. Many of the inclusions seen with the electron microscope had the morphologic appearance of lysosomes, but definite identification must await cytochemical evidence.

A mucocutaneous disease in the dog, resembling pemphigus vulgaris in man

A chronic mucocutaneous disease was diagnosed in 3 dogs. Clinically, the disease was characterized by erosions and ulcerations of the oral mucosa, various mucocutaneous junctions, and the skin. Histologically, there was acantholysis or a separation of the epithelial cells from one another, resulting in the formation of clefts and bullae. Based on clinical and laboratory findings, the disease seemed to be the canine equivalent of pemphigus vulgaris (PV) in man.

Ultrastructure of the simple encapsulated nerve endings (simple end-bulbs of Krause) in the tongue of the cat

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Tissue reactions to two fissure sealant resina

Specimens of polymerized and unpolymerized Nuva-Seal and Alpha-Seal were implanted subcutaneously on polythene rods. Polymerized specimens caused only slightly greater reaction than controls over intervals of from 2 days to 1 year. Unpolymerized specimens caused necrosis, marked inflammatory cell infiltration and granulation tissue formation for up to 1 week but were similar to the controls at 1 year. No reaction to unpolymerized resin painted on the oral mucosa was observed.

An electron microscopic study of oral lesions in erythema multiforme

The ultrastructure of oral lesions in 6 patients with erythema multiforme (EM) and of one apparently clinically healthy oral mucosa in one patient with recurrent EM during remission is described. Alterations were observed in epithelium, basal lamina and lamina propria. Both intercellular and intracellular oedema, intracellular vacuolization, decreased numbers of desmosomes, and also loss of cytoplasmic organelles and occasional nuclei were noted in the epithelium. Inflammatory cells--mainly lymphocytes--were found intra-epithelially. Several discontinuities together with some evidence of duplication of the basal lamina were seen in five of the six lesional mucosa specimens. The inflammatory infiltrate in the lamina propria consisted mainly of lymphocytes, although plasma cells, neutrophilic and eosinophilic leukocytes, macrophages and mast cells were also found. Some of the mast cells were partly degranulated. The apparently clinically healthy oral mucosa in the patient with EM in remission showed mild inflammatory changes. The changes observed in the lesional mucosa in EM are thus according to our study mostly non-specific inflammatory alterations and are not pathognomonic for EM.