50X, ABBEY, ALVEOLATA, ANIMALCULE, AT, BIOLOGIA, BIOLOGICAL, BIOLOGY, CAUDATUM, CELLED, CHROMALVEOLATA, CILIA, CILIATE, CILIOPHORA, CONTRAST, DIC, DIFFERENTIAL, DZIENNY, EUKARYA, EUKARYOTE, IMAGING, INTERFERENCE, JASNA, JASNY, JEDYNA, JEDYNE, JEDYNY, KAWALER, KONTRAST, LEKKA, LEKKI, LEKKIE, LIGHT, LIVING, LM, MAGNIFICATION, MICHAEL, MICROBIOLOGICAL, MICROBIOLOGY, MICROGRAPH, MICROGRAPHY, MICROORGANISM, MIKROBIOLOGIA, NAUKA, OPACTWO, ORGANISM, PARAMECIIDAE, PARAMECIUM, PENICULIDA, POJEDYNCZY, POKAZYWANIE, PROTIST, PROTISTA, PROTOZOA, PROTOZOAN, SCIENCE, SHOWING, SINGIEL, SINGLE, SINGLE-CELLED, SLIPPER, SPECIMEN, SWIATLO, UNICELLULAR, WYSWIETLANIE, ZYJACE, ZYJACY,