Osmium (from Greek á½ÏÎ¼Î® osme, smell) is a chemical element with symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Osmium is the densest naturally occurring element, with a density of 7004225900000000000â 22.59 g/cm3. Its alloys with platinum, iridium, and other platinum-group metals are employed in fountain pen nibs, electrical contacts, and other applications where extreme durability and hardness are needed.
Goiter is a noncancerous enlargement of the thyroid gland. The most common cause of goiter worldwide is iodine deficiency in the diet. Goiter is often caused by (and a symptom of) hyperthyroidism in the United States, where iodized salt provides plenty of iodine.
About Hyperthyroidism. The thyroid gland is a part of the body's endocrine (hormone) system â which is made up of the glands that help regulate many of the body's different functions. An overactive thyroid produces too much of the thyroid hormone thyroxine, which causes some of these functions to speed up.Hyperthyroidism is the medical term for an overactive thyroid gland. Too little thyroxine reverses the process and slows down the body's functions.This can be caused by an underactive thyroid, a condition also referred to as hypothyroidism. Symptoms. Hyperthyroidism often causes the thyroid gland, which is located at the front of the neck, to become noticeably larger.oo little thyroxine reverses the process and slows down the body's functions. This can be caused by an underactive thyroid, a condition also referred to as hypothyroidism. Symptoms. Hyperthyroidism often causes the thyroid gland, which is located at the front of the neck, to become noticeably larger.