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 as it existed in America was a practice founded on the chattel principle. Slaves were treated as human chattel to be traded, sold, used, and ranked not among beings, but among things, as an article of property to the owner or possessor.lavery in Colonial America. The first arrivals of Africans in America were treated similarly to the indentured servants in Europe. Black servants were treated differently from the white servants and by 1740 the slavery system in colonial America was fully developed.