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Biomedical subjects

J Svejda

Publications and source records attributed to J Svejda.

At least 73 records · Page 4Linked to original sources
PubMed1978

Establishment of cell line derived from human malignant melanoma.

A new human cell line of malignant melanoma (MJM) was established with the use of the in vitro fragment technique. It has been maintained over 34 months of continuous cultivation. Three types of cells can be recognized by light microscope. The epitheloid elements predominate, less frequent are fibroblastoid and giant multinuclear cells. The pigment production is not macroscopically visible. Over 60 per cent of analyzed metabphases showed hyperdiploid number of chromosomes, the rest was mostly tetra and hexaploid. No marker chromosomes were detected. The growth studies indicate the MJM cells have 63-hr doubling time. Cytochemistry revealed positive pigment or propigment granules in 36 per cent of cells. Ultrastructural studies did not detect melanin granules but some particles resembling atypical premelanosomes and melanosomes were recognized in some sections.

Cell Cycle↗
PubMed1977

Hairlike variations of filiform papillae in the human tongue.

The ultrastructural characteristics of the hairlike variations of filiform papillae in the human tongue were studied by scanning and transmission electron microscopy. The scanning electron microscope gives evidence of a three-dimensional image of abnormally long secondary papillae with the epithelial cells arranged like roof tiles. These are partly adhering, partly detached, and then protruding from the core, thus forming the hairlike structure. Transmission electron microscopy of ultrathin sections shows single or partly adhering, orthokeratinized epithelial surface cells, mostly with distinct signs of degradation, surrounded by microorganisms. The pathomorphologic picture of elongated, hairlike filiform papillae was observed on the tongue coating of patients with clinically diagnosed hairy tongue but also on some small areas of the tongue of infants. These latter findings cannot be characterized by the clinical term "hairy tongue" but must be considered to be hairlike variations of filiform papillae.

Aged↗
PubMed1977

Some remarks to the histological classification of malignant melanoma of the skin and its prognostic values.

Histological classification of human skin malignant melanoma as recommended by WHO melanoma group renders the first useful orientation in regard to the biological behavior of the tumor, but it cannot give any further clinical outlook. It would be therefore desiderable to complete the histological examinations with enzymatic and immunologic examinations performed during the treatment of the patient and thus try to gain a basis for a prognostic evaluation.

Humans↗
PubMed1977

Cytologic diagnosis of malignant melanoma.

Cytology in malignant melanoma of the skin is a useful method, which alone yields in many cases enough diagnostic informations for a therapeutical approach. It is of a special importance in cases with marked anisocytosis of cells and with large, sometimes polynuclear cells and with cells with melanotic pigment. In cases with middle-sized apigmented cells of epitheloid appearance it should be always completed by biopsy, which, in these cases predominates over cytology. Combination of both methods brings a more substantial elucidation of diagnosis.

Cytodiagnosis↗
PubMed1976

[Enamel bundles and lamellae under the scanning electron microscope].

Lamellae, tufts and cracks were found in the enamel near the dentionenamel junction. When investigated by the scanning electron microscop, lamellae and tufts were very similar to each other as to their structure. Lamellae appeared in two kinds: 1. Organic material originating in the dentionenamel membrane filled the whole space. 2. The space was empty, yet an organic membrane was covering the walls of adjacent prisms. Tufts and lamellae differed merely in their lenght. The walls of the cracks lacked organic material, the prisms being damaged or their course interrupted.

Bicuspid↗