Tiller Dynamic of Guineagrass (\u3cem\u3ePanicum maximum\u3c/em\u3e) Under Defoliation

Guineagrass (Panicum maximum) is a perennial warm season bunchgrass native to Africa that has been introduced to many tropical areas. Its management is important because of its important role in animal production. Total production of herbage and the persistence of tufted grasses can be markedly reduced when the grass is defoliated too frequently and too intensively (Clavero, 1997). In order to determine the proper management for optimum production and long term persistence, it is important to study the effect of cutting practices on tiller dynamics of guineagrass

Crecimiento de Racosperma mangium Willd en fase de vivero irrigada con aguas residuales

Con el objetivo de evaluar el crecimiento de Racosperma mangium Willd regada con aguas residuales durante la fase de vivero, se realizó un experimento en las instalaciones del Centro de Investigaciones del Agua de la Universidad del Zulia. Los tratamientos aplicados fueron 5 niveles de agua residual en el agua de riego (0, 25, 50, 75 y 100%). Los tratamientos fueron aplicados diariamente y se midió semanalmente de forma destructiva la longitud de la parte aérea (LPA) y radical (LPR), peso seco de la parte aérea (PSA) y radical (PSR), número de hojas (NH) y el área foliar total (AF) durante la fase de vivero (12 semanas después de la germinación). Se obtuvo una respuesta altamente significativa (P<0,01) de los tratamientos de agua residual sobre el comportamiento de las variables evaluadas excepto para LPR. Los mayores valores para LPA (29,28 cm), PSA y PSR (5,16 y 3,00 gr, respectivamente), NH y AF (17,77 y 325,43 cm2, respectivamente) se obtuvieron con el tratamiento de 100% agua residual. Se concluye que el uso de aguas residuales afecta favorablemente el desarrollo de R. mangium en condiciones de vivero

Primary High-Grade Myofibroblastic Sarcoma Arising From the Pericardium

Primary pericardial sarcomas are very rare. A 62-year-old Japanese man presented with cardiac tamponade. Echocardiography, computed tomography and magnetic resonance imaging revealed massive pericardial effusion and a large tumor in the pericardial cavity, attached to the pericardium of the left ventricular posterolateral free wall. Surgical excision of the tumor was performed and histopathological and immimohistochemical examinations identified high-grade myofibroblastic sarcoma. Because of local recurrence soon after surgery, the patient received adjuvant chemotherapy, including doxorubicin and ifosfamide, and subsequent radiotherapy. As of 6 months after completing radiotherapy, the patient was alive and no disease progression or distant metastases were evident. This may be the first report of primary high-grade myofibroblastic sarcoma arising from the pericardium