Word: bacterias
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...chemicals, known as trihalomethanes, are formed when chlorine used to kill bacteria in the water mixes with organic material. The most commonly produced substance is chloroform, which causes cancer in lab animals...
Thomas' plan has a low probability; scientists rarely speak of absolute impossibilities. One of the author's keenest pleasures is describing phenomena that should not occur: a species of bacteria that thrives on temperatures of more than 300° C or a type of virus that propagates vigorously even though it does not contain any detectable genetic material...
Wacker explained that "it's not reasonable to take the risk of bacterial contamination," although he said bacteria probably did not cause the problem. "They were testing the fire hydrants outside and I think that Lowell House is experiencing similar problems with its water," he added...
...staphylococci in petri plates (flat glass culture dishes). One day he found that mold had spoiled one of his cultures. Staphylococci grew on only half of the plate. A blue-green mold spotted, but did not cover, the other half. He noticed that the mold had cleared a wide, bacteria-free area between itself and the staphylococci-perhaps had killed them...
Next year what Dr. Fleming knew about the mold's bacteria-baiting byproduct appeared in the British Journal of Experimental Pathology. He had found out that the mold was some kind of Penicillium (from the Latin for pencil-the shape of the magnified mold). He named its by-product penicillin. Having made his great discovery, Dr. Fleming went on to other work. He was engaged in many other experiments-no scientist knows just which of his bottles contains the Nobel Prize...