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.
While the United States remained an agrarian country during this period, the vast majority of the industrial development, or building of factories to turn raw materials into finished... Slavery had an overwhelming impact on the economy, politics, and society of the United States during the first sixty years of the nineteenth century. The most important effect was to divide American political culture into two increasingly irreconcilable factions until the differences exploded into a civil war.