41. The U . N . has decided to essentially succumb to pressure and become an active agent of discrimination. 42. "By being active agents in their world, children learn they can have a positive effect on it, " said Levin. 43. I strongly believe that as a class, these are the most active agents against HIV we have seen to date, 44. In contrast to differential prediction, uplift modelling assumes an active agent , and uses the uplift measure as an optimization metric. 45. He cautions against viewing technology merely as a human tool and advocates instead to consider it as an active agent . 46. The active agent ( s ) that cause hallucinations in humans, and the origin of these agents, are not clear. 47. He had a passionate love of his country and was an active agent in Rome of the Irish Confederate Catholics. 48. The drug is in the form of an inactive lactone that is hydrolyzed after ingestion to produce the active agent . 49. Indian witches still remained the most active agents of that spirit on earth, and Tenskwatawa sought to identify and destroy them. 50. "Separating research from development will improve the chances of finding novel active agents more rapidly than before, " the statement said.