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.
Slavery is a prominent part of United States history. Slavery has existed for thousands of years in many cultures, but in the United States, the institution seemed to have been perfected. It also came at a time of enlightenment, when many began to see slavery not as the necessity that many felt it was, but as an evil exploitation of men.