Penicillin nontoxic in humans by first performing toxicity tests in animals and then on humans. His subsequent experiments on penicillin's response to heat and pH allowed Fleming to increase the stability of the compound. The one test that modern scientists would find missing from his work was the test of penicillin on an infected animal, the results of which would likely have sparked great interest in penicillin and sped its development by almost a decade. The importance of his work has been recognized by the placement of an International Historic Chemical Landmark at the Alexander Fleming Laboratory Museum in London on
Valentine Leeper woman", and as being at "the forefront of insightful biography". Valentine Leeper Valentine Alexa Leeper (14 February 1900 – 26 July 2001) was an Australian classicist, teacher, polemicist, and letter-writer of renown. Valentine Leeper was born on Valentine's Day 1900 in the Leeper Building of Trinity College at the University of Melbourne, daughter of Dr Alexander Leeper, first Warden of that college, and his second wife, Mary (née Moule). Her half-brothers, Reginald Leeper and Allen Leeper, both became prominent British diplomats. Her brother, Geoffrey Leeper, became the first professor of agricultural chemistry at the University of Melbourne. Valentine was educated