Upregulation of glial cell line-derived neurotrophic factor (GDNF) in the rat cochlea following noise. Pharmacologic manipulation of the labyrinth with novel and traditional agents delivered to the inner ear.
Slavery in the United States was the legal institution of human chattel slavery that existed in the United States of America in the 18th and 19th centuries after it gained independence and before the end of the American Civil War.he United States was polarized over the issue of slavery, represented by the slave and free states divided by the MasonâDixon line, which separated free Pennsylvania from slave Maryland and Delaware.
Popular sovereignty was often cited before the US Civil War as a reason why individuals in a newly organized territory should have the right to decide whether or not slavery should be allowed. The Kansas-Nebraska Act of 1854 was based on this idea. It set the stage for a situation that became known as Bleeding Kansas.