ACID, ANAEROBE, AND, BACTERIA, BACTERIUM, BLACK, BW, CELL, CELLS, ELECTRON, FACULTATIVE, FREEZE-FRACTURED, IMAGE, IMAGING, LAB, LACTIC, MEDICAL, MEDICINE, MICROGRAPH, OF, SCIENCE, SCIMAT, STREPTOCOCCUS, TEM, TEMS, THERMOPHILUS, TRANSMISSION, W, WHITE,