Word: bacterium
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...next critical point, Evolution, is simply treated as it is now regarded by the civilized world, as a law of nature. The evolution of animal from vegetable life is also dealt with simply, by showing the absence of a clear dividing line at or near the lowly, ambiguous bacterium...
Zeiss microscope makers of Jena showed a cinema reel of unicellular life-isolated bacterium pneumococcus (pneumonia), bacterium streptococcus (pus), saccharomyces (yeast). It is possible to infect and kill an animal with a single germ. Such a germ proliferates to form a colony...
...every kind of bacteria has a bacteriophage which kills it. He has not seen these bacteriophages. But he has measured them. The diameter of each one is between 20 and 30 millicrons or about one-billionth of an inch.† Also, he has seen how they destroy a bacterium. One or more bacteriophages, of the kind peculiar to the bacterium under study, penetrate the body of the germ. There they breed until they number some 18, when they become too many for the bacterium to contain any longer. It explodes into floccules, minute yet visible below the microscope lens. These...
...Bacterium tularense was first discovered and named by Dr. George W. McCoy of the U. S. Public Health Service in 1912, after he had isolated it from ground squirrels in Tulare County, Calif. In 1920, Dr. Edward Francis of the Public Health Service discovered that jack rabbits in the states around Great Salt Lake were infected with this disease, and that the human disease known as deer-fly fever was transmitted to man by the bite of a blood-sucking fly, which had been infected previously by biting the diseased jack rabbit...
...Smith who demonstrated that the crown gall, a plant disease resembling animal cancer, could be experimentally transmissted from plant to plant by cultures of a microorganism found in the gall. He is convinced that human cancers are caused by a similar infection, though no active parasite, either bacterium or protozoon, has yet been found. Many investigators of plant and animal cancer have caused cancer experimentally in varied ways-by injecting a virus from the growths, by painting rats with irritating substances, and by nematodes (microscopic worms), tape worms, other parasites. In short, Dr. Smith's theory is that...