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.
Confidence votes 15.8K. johannes gutenburg invented the printing press which had many impacts like: There was a viable alternative to documents being written by hand. Clerics and scribes had the job of copying texts as the only means of written publications. The manual process limited the range of books and certainly limited the availability of the written word to people.