Dipropylene glycol methyl ether (DPGME) is one of the most commonly used propylene glycol ethers in industry and is discussed in a recently published NEG/NIOSH document. DPGME is a collective term describing a mixture of structural isomers.
The Incas were a civilization in South America formed by ethnic Quechua people also known as Amerindians. In 1400AD they were a small highland tribe, one hundred years later in the early 16th century the Incas rose to conquer and control the largest empire ever seen in the Americas forming the great Inca Empire.
History >> Aztec, Maya, and Inca for Kids. When the Spanish arrived in Peru in the 1500s the Inca Empire was huge. It stretched for over 2000 miles from the north to the south and had a population of an estimated 10 million people. The Inca needed a sophisticated and organized government to maintain an empire this large. Monarchy The Inca government was called the Tawantinsuyu. It was a monarchy ruled by a single leader called the Sapa Inca. Sapa Inca - The emperor or king of the Inca Empire was called the Sapa Inca, which means sole ruler. He was the most powerful person in the land and everyone else reported to the Sapa Inca. His principal wife, the queen, was called the coya. Inca Government Organization Below the Sapa Inca were several officers who helped to rule the empire. High ranking officials were often relatives of the emperor and were always part of the Inca class. Viceroy - Below the Sapa Inca was the viceroy, or Inkap Rantin. He was a close relative of the Sapa Inca and worked as his closest advisor.