title: Age-related differences in the structure of human pineal calcium deposits: results of transmission electron microscopy and mineralographic microanalysis.
abstract: Pineal tissue calcifications (male, ages 14, 47, 62, 82), which were metallographically embedded and polished at controlled levels and studied by transmission electron microscopy and microanalytic spectroscopy, showed age-related differences. Results show that concentrically arranged crescent-shaped lamellae increase in number and decrease in width with age. Calcium (Ca) and phosphorus (P) per point measurements in dark and light lamellae at various distances from the core show Ca/P molar ratios between 1.49-1.62 in the 82-year-old specimen as compared to 1.26 to 1.41 in the younger specimens. The 62-year-old specimens show a decrease in P and an increase in Ca from periphery to center. These data and other descriptive details suggest that the sum of these changes represent remodelling of the mineralogical structure within the same calcification throughout the life span.
authors.affiliation: Pineal Research Laboratory, VA Medical Center, Providence, RI 02908, USA.
authors.forename: H A
authors.initials: HA
authors.lastname: Schmid
authors.forename: G
authors.initials: G
authors.lastname: Raykhtsaum
mesh_terms: D000293:Adolescent; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D002114:Calcinosis / Q000378:metabolism* / Q000473:pathology; D002118:Calcium / Q000032:analysis*; D004577:Electron Probe Microanalysis; D006801:Humans; D008297:Male; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D010758:Phosphorus / Q000032:analysis; D010870:Pineal Gland / Q000737:chemistry* / Q000648:ultrastructure
chemical_list: D010758:Phosphorus; D002118:Calcium