The Earth in the universe, life and the evolution of life
Cognitive objectives:
Observation of cellular ultrastructures
Composition for 20 pairs of students (100ml of solution):

• 0.5 g of hemicellulose
  
• 0.1g of pectinase.
  
  
• 1g of cellulase
  
• 10g of mannitol
  
• 1.39g of NaH2PO4.
  
• 1.34g of Na2HPO4
  Technical and educational instructions available on our website.
  
  Necessary material:
  Leek leaf, microscope, glass slides
  Conservation: freezer