Biomedical subjects

L C Junqueira

Publications and source records attributed to L C Junqueira.

52 records · Page 3Linked to original sources

PubMed1978

Carotenoid and pterin pigment localization in fish chromatophores.

The classical sulfuric acid method for the histochemical detection of carotenoids has been adapted to give a reliable cytological localization of these compounds in fish chromatophores. This procedure consists mainly in fixing skin fragments in glutaraldehyde and dehydrating in a 50% solution of glycerin followed by exposure to air. It is essential that the preparation permit direct contact of the sulfuric acid with the pigment cells. Under these conditions, carotenoid containing cells stain green or blue. When associated with the extraction of the carotenoids by acetone, the procedure permits the distinction between pterin and carotenoid in fish chromatophores.

Acetone↗

PubMed1976

Gross, microscopic and ultrastructural study of the intestinal tube of Xenodon merremii Wagler, 1824 (Ophidia).

The small and large intestines of Xenodon merremii have a similar structure. They are separated by a sphincter of thickened circular muscle. The mucosa of the proximal part of the small intestine is raised into a honeycomb pattern, but distally there are only longitudinal folds. The lining epithelium throughout is of a simple columnar type, with absorptive, goblet, argentaffin and argyrophil cells, but no Paneth cells, villi or crypts of Lieberkühn are present.

Animals↗

PubMed1976

Fine structure of the esophagus lining epithelials cells of the snake Xenodon merremii Wagler, 1824 (Ophidia).

The authors studied the ultrastructure of the esophagus lining epithelial cells of the snake Xenodon merremii. The initial shows ciliated wedge shaped cells and goblet cells which are gradually displaced by columnar ones in the posterior third of the organ. Other cellular types, such as basal, argentaffin and argyrophil cells can be found throughout the esophagus mucosa.

Animals↗

PubMed1974