فهرست مطالب ahmadmahmudi

The purpose of this study is to investigate the seismic design methods of the retaining walls. Seismic behavior of the retaining walls for dynamic loads, seismic design and stability of these structures during the earthquake were studied by studying retaining wall design methods. The overall lateral pressures during earthquake vibrations are the static pressures that occur before the earthquake and the dynamic pressures generated by the earthquake, and the wall response is affected by both pressures. The results of this study show that if there is a possibility of sliding, rotating, or deforming to a sufficient degree to be able to mobilize the active soil pressure, the dynamic wall pressures will be applied via static or semi-static Mononobe -Okabe methods. In case of impermeability of the retaining walls (fixed walls), elastic analysis is also performed, and the most common dynamic analysis methods include the Mononobe -Okabe semi-static method, the Steedman - Zeng method, the Wood method and the Westergaard method, which can be developed.

Leiomyosarcoma in birds is relatively rare. This tumor as a muscle neoplasm was reported in captive and free ranging birds. Smooth muscle cells may develop to the leiomyosracoma, but splenic smooth muscle trabeculae is most common site of the tumor growth. Although budgerigars have an incidence of neoplastic diseases but smooth muscle tumors were rarely reported in this species. To the best of our knowledge, present case is the first report of cutaneous leiomyosarcoma in budgerigar. The bird was referred with a history of growing mass in subcutaneous tissue of abdomen. First bird was suspected to the egg impaction, but necropsy confirmed a firm, creamy structure that suspected to the tumor mass. No invasion was observed to the other organs. After excision of the mass, routine histopathologic evaluation and immunohisochemistry investogation were performed for desmin and smooth muscle actin (SMA). Histopathologic examination revealed spindle-shaped cell with cigar-shaped, round, or oval nuclei with cytologic criteria of malignancy including marked pleomorphism and high mitotic activity. These findings were consistent with immunohistochemistry profile of our case and thus confirmed as cutanous liomyosarcoma.

Blood samples were collected from 20 healthy miniature Caspian horses at 37 °C. Isolation of cryoglobulin was performed based on a standard method in present study. Harvested sera were kept at 4 °C for two hours and then examined for cryoglubolin. Four serum samples containing precipitate Suspicious of containing cryoglobulin were selected. Subsequently serum protein electrophoresis was performed on normal serum samples and also on four serum samples containing precipitates using an automated electrophoresis system on cellulose acetate strips. In addition Ig isotypes detection (IgG, IgM and IgA) was performed on both precipitates and serum containing precipitates using single radio immunediffusion method (SRID). A narrow-based peak on gamma region of precipitate acetate cellulose strips was observed. Precipitate concentrations were strikingly higher than normal concentration of serum immuneglobulins. It can be suggested that cryoglobulin concentration in a proportion of Caspian miniature horse is higher than other equides may be in relation with animal susceptibility to neoplasias such as lymphoma and leukemia.