Plant stem stems are asparagus, bamboo shoots, cactus pads or nopalitos, kohlrabi, and water chestnut. The spice, cinnamon is bark from a tree trunk. Gum arabic is an important food additive obtained from the trunks of "Acacia senegal" trees. Chicle, the main ingredient in chewing gum, is obtained from trunks of the chicle tree. Medicines obtained from stems include quinine from the bark of cinchona trees, camphor distilled from wood of a tree in the same genus that provides cinnamon, and the muscle relaxant curare from the bark of tropical vines. Wood is used in thousands of ways, e.g. buildings, furniture, boats,
Analgesic nephropathy between the 1960s and 1980s. As the use of phenacetin declined, so too did the prevalence of analgesic nephropathy as a cause of end-stage kidney disease. Data from Switzerland, for example, demonstrated a decline in the prevalence of analgesic nephropathy among people with end-stage kidney disease, from 28% in 1981 to 12% in 1990. An autopsy study performed in Switzerland suggested that the prevalence of analgesic nephropathy in the general population has likewise decreased; the prevalence was 3% in 1980 and 0.2% in 2000. While these data demonstrate that analgesic nephropathy has been all but eliminated in some regions, in