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Those findings suggested a bactericidal activity against the pathogen.

Hollmann tested her treatment on his patients, and he saw that the ethyl esters were bactericidal, capable of killing bacteria.

Otolaryngologist Noam Cohen of the University of Pennsylvania and colleagues determined that tuft cells in the nasal passages respond to bitter chemicals and release IL-25, spurring neighboring cells to pump out bactericidal proteins.

Second, North points to the 1980s fashion among food manufacturers, at the supermarkets’ behest, for a blander, lower-vinegar mayonnaise: “Mrs Beeton’s classic mayonnaise recipe was actively bactericidal.”

Other perchlorates found on Mars had a similar bactericidal effect.