Word: vitro
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Dates: during 1920-1929
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...blood was reported by Professor Charles Christian Lieb of Columbia (pharmacologist) from the researches of Dr. Hendrik Zwaardemaker, professor emeritus of physiology at the University of Utrecht, Holland. Professor Zwaardemaker took the hearts out of eels and frogs, pumped through them physiological salt solutions. The hearts beat in vitro half an hour or so, then ceased. Professor Zwaardemaker added small amounts of potassium salt to his solution. The hearts began to beat again. They continued so for 24 hours. Potassium is weakly radioactive. Other radioactive elements gave the same stimulating results-radium, thorium, uranium, polonium...
...Cleveland, Assistant Professor of Protozoology, to permit him to study the relation of protozoa in vivo and in vitro to bacteria, and the life cycles of amoebae...