Contents:

17 21 31 Changes in the environment caused by microorganisms (3F)
17 21 44* Algae - propagation; formation of colonies (1F)
17 21 45 Euglena - differentiation of single-cell life into animal cell/plant life, the importance of organelles (2F)
17 21 32 Microscopic form of the bacteria differentiation (2F)
17 21 34 The useful functions of bacteria (3F)
17 21 35 Antiseptic action protects organic substances (3F)
17 21 47* Bacteriophages and viruses - intercellular parasitic action by transfer of foreign hereditary material (2F)
17 21 46 Fungi causing mould and yeast (2F)
17 21 48* Dawny mildew at the vine (1F)
17 21 49* Rust, smut and ergot fungi as cereal parasites (1F)
17 21 70* Fungi - microorganisms in biological pest control (1F)
17 21 71* Biological sewage treatment (1F)

12 transparencies with 22 foils, size: 21,5 x 28 cm, with subject-matter texts, in a special ring binder.
Price (without V.A.T.): 148,50 Euro