What causes elevated AST levels? Causes of elevated aspartate aminotransferase, or AST, levels include a heart attack; liver, kidney or lung damage; medicines; high doses of vitamin A; and mononucleosis, states WebMD. Normal levels for adult women and men range between 10 and 36 units per liter and 14 and 20 units per liter respectively.
In 1041, movable clay type was first invented in China. Johannes Gutenberg, a goldsmith and businessman from the mining town of Mainz in southern Germany, borrowed money to invent a technology that changed the world of printing.
According to most historians, the printing press was invented by Gutenberg, in Mainz, in the Holy Roman Empire (Germany) in 1441, or about that time. There are many people w â¦ ho disagree over the invention of the printing press, and alternate views have been put forward.here are other claimants to the invention of the printing press, and there are those who say there is evidence that the press may have been invented as early as the 13th century. Woodblock printing was done in Europe before Gutenberg.