Electron Microscopic Studies on the Silver-stained Nucleolar Cycle of Physarum polycephalum Ultrastructural Changes in Rape Mesophyll Cells during Their De-differentiation and Re-differentiation Ultrastructural Localization of Acid Phosphatase Activity in Soybean Cotyledon Cells The Responses of Sagittaria sagittifolia L. to Environmental Cadmium Stress NITROGEN FIXING ROOT NODULES AND ITS FRANKIA ENDOPHYTE OF HIPPOPHAE RHAMNOIDES L. Comparation of Pollen Ultrastructural Morphology Among Pomegranate (Punica granatum)Cultivars in Shandong Province Comparation of Pollen Ultrastructural Morphology Among Pomegranate (Punica granatum)Cultivars in Shandong Province Ultrastructural Localization of ATPase Activity in Cells of leaf Chlorenchyma of Aloe vera L. under Salt Stress and the Effect of Silicon Pollen Morphology of Morus atropurpurea with Different Ploidies Ultrastructural Localization of ATPase Activity in Cells of leaf Chlorenchyma of Aloe vera L. under Salt Stress and the Effect of Silicon Tissue culture of Impatiens blepharosepala and ultrastructural observation of callus Ultrastructural Studies of Vegetative Cells on Jaoa bullata (Jao) Fan