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.
Text Preview. Slavery was a practice in many countries in the 17th and 18th centuries, but its effects in human history was unique to the United States.t was implied, and enforced, that Africans were of a lesser class through the means in which they were used by the slave owners to promote their wealth and stature. The larger their plantation, the wealthier and more successful people were seen.