(1)紫色洋葱表皮的撕取方法改进。在质壁分离及复原的实验中,紫色洋葱表皮的撕取往往制约着实验的进程和效果。在多年的实验教学中发现:采用教材中撕取方法(在紫色洋葱表皮上划小方块,然后撕取)的效果不好:首先撕下的表皮厚薄不均,有的太厚,多层细胞重叠,在显微镜下看不清;有的 (1) Improvement of tearing method of purple onion skin. In the experiment of plasmolysis and recovery, the peeling of purple onion epidermis often constrains the progress and effect of the experiment. In many years of experimental teaching, it has been found that the use of tear-off methods in textbooks (dotted small squares on the purple onion epidermis and then torn them) does not work well: First, the peeled skin is unevenly thick, and some are too thick. Overlap, not clear under the microscope; some