Morphological and anatomical studies on the leaves of four species of Aloe In Vitro Culture of Tetraploids of Aloe vera L. Effects of Silicon on Parameters of Chlorophyll Fluorescence and Ultra structure of Chloropla st in Aloe vera L. under Salt Stress Ultrastructural Localization of ATPase Activity in Cells of leaf Chlorenchyma of Aloe vera L. under Salt Stress and the Effect of Silicon Studies on phenolic compounds in Aloe vera Effects of Shading on Cellular Ultrastructure and Aloin Content of Aloe vera L. In Vitro Culture of Tetraploids of Aloe vera L. Ultrastructural Localization of ATPase Activity in Cells of leaf Chlorenchyma of Aloe vera L. under Salt Stress and the Effect of Silicon Effects of Silicon on Parameters of Chlorophyll Fluorescence and Ultra structure of Chloropla st in Aloe vera L. under Salt Stress ANALYSIS OF ACTIVE COMPONENT OF ALOE GELATIN IN DIFFERENT LIVING CONDITION