50 research outputs found
A Cardiac Rhabdomyoma in a Guinea Pig
A guinea pig (9-week-old) that had been placed in a control group for a
pharmacological test was found to have a single nodule on the surface of the
right ventricular wall. In a transverse section of the heart after fixation, a
whitish mass was found that extended from the subendocardium to the
subepicardium of the right ventricular wall. Histopathological examination
revealed a spongy network consisting of vacuolated spaces in the myocardium of
the right ventricle extending to the myocardium and subepicardium of the right
atrium. The vacuolated space was PAS-positive. Immunohistochemical examinations
revealed that the lesions contained striated fibers that were positive for
anti-desmin and anti-myoglobin. Electron micrographs revealed the lesions
resulting in affected striated muscle fibers and accumulations of many glycogen
granules. Based on the findings, the lesions were diagnosed as a cardiac
rhabdomyoma. This is the first report of application of immunohistochemical
examinations to diagnosis of cardiac rhabdomyoma in the guinea pig
Pressure-induced phase transition for single crystalline LaO0.5F0.5BiSe2
We have demonstrated a pressure-induced phase transition from a low-Tc phase
to a high-Tc phase in a single crystal of the superconductor LaO0.5F0.5BiSe2.
The high-Tc phase appears at 2.16 GPa and the maximum superconducting
transition temperature (Tc) is observed at 6.7 K under 2.44 GPa. Although the
anisotropy ({\gamma}) for the low-Tc phase is estimated to be 20, it is reduced
by around half (9.3) in the high-Tc phase. This tendency is the same for the
BiS2 system. The Tc of LaO0.5F0.5BiSe2 has continued to increase up to the
maximum pressure of this study (2.44 GPa). Therefore applied further pressure
has the potential to induce a much higher Tc in this system.Comment: 12 pages, 4 figure