Findings were useful for understanding the nature of fractures in pet rabbits and supported the use of micro-CT versus radiography for fracture detection and evaluation.
A neoplastic nodular lesion consisting of an admixture of granular cell tumor and
adenocarcinoma was found in the uterus of a 26-month-old Djungarian hamster. Neoplastic
cells of the uterine adenocarcinoma showed an epithelial nature in their growth patterns
and by cytokeratin-immunopositive reaction, exhibiting nuclear pleomorphism. The granular
cells had an abundant amount of fine granular eosinophilic cytoplasm and eccentric or
central nuclei with no nuclear atypia; the granular structures were positive for periodic
acid-Schiff with diastase resistance and were confirmed as lysosomes/autophagosomes by
electron microscopy; immunohistochemically, the cells reacted to desmin, vimentin and
α-smooth muscle actin and negatively for neurogenic, histiocyte/macrophage or epithelial
markers, indicating smooth muscle origin. Because these tumors were generated from
different cell origins, a diagnosis of collision tumor was made.
Red-crowned cranes (Grus japonensis) are native to eastern Hokkaido (island population), in contrast to the mainland, which migrates between the Amur River basin and eastern China-Korea peninsula. During the 1990s we found that Red-crowned cranes in Hokkaido were highly contaminated with mercury: however, the source was unknown. We investigated the time trend of mercury contamination in Red-crowned cranes. Total mercury levels in the livers and kidneys from cranes dead in the 2000s were lower than those dead in the 1990s. Feather is a major pathway of mercury excretion for many bird species and is used as an indicator of blood mercury level during feather growth. As internal organs from the specimens collected before 1988 were not available, we analyzed the flight feather shavings from stuffed Red-crowned cranes dead in 1959-1987 and found that the mercury level of feathers from cranes dead in the 1960s and 1970s was not more than those from the cranes dead in the 2000s. These results suggest that mercury contamination in Red-crowned cranes in Hokkaido decreased temporally during the 1990s-2000s. This indicates the possible occurrence of some mercury pollution in Red-crowned cranes' habitat in this region in the 1990s or before.
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