Phenotypic changes in mast cells proliferating in the rat lung following infection with Nippostrongylus brasiliensis.

Numerous mast cells appear in rat pulmonary granulomas associated with infection by the nematode Nippostrongylus brasiliensis. The kinetics and histochemical characteristics of these mast cells were studied and compared with those of intestinal mucosal mast cells. The number of lung mast cells showed a distinct increase 2 weeks after injection and then gradually decreased.

Morphometric analysis of human neuromuscular junction in different ages.

Application of morphometric analysis to the study of neuromuscular junction is helpful to the quantitative approach of ultrastructural changes. In this study, twelve autopsied subjects of different ages were examined on the ultrastructure of neuromuscular junctions using morphometric analysis. The postsynaptic area and postsynaptic membrane length were significantly greater in adults than in infants.