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Application Note for Leica EM AMW – Plants (5-years old) were grown in pots filled with soil and kept in greenhouse conditions. Five weeks before harvesting the plants were transferred into growth chambers and cultivated at a temperature of 20°C during daytime and 12°C overnight. The relative humidity was set at 60% and the photoactive radiation was 500 μmol m-2 s-1 during daytime. Sample preparation for transmission electron microscopy (TEM) was performed in order to develop a standard protocol that would reduce sample preparation time for TEM-investigations. Therefore the overall and fine structure of leaf cells prepared with the Leica EM AMW were compared with leaf cells that were prepared with a conventional fixation protocol at room temperature.