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a chemical element, atomic number 53, atomic weight 126.904. (See Appendix 6.) Iodine is essential in nutrition, being especially prevalent in the colloid of the thyroid gland. It is used in the treatment of hypothyroidism and as a topical antiseptic. Iodine is a frequent cause of poisoning (see iodism). Deficiency of iodine causes goiter. Since iodine salts are opaque to x-rays, they can be combined with other compounds and used as contrast media in diagnostic x-ray examinations of the gallbladder and kidneys.
iodine 123 a radioactive isotope of iodine having a half-life of 13.2 hours and emitting gamma rays and x-rays. It is used in diagnostic imaging and as radiation sources in radiation therapy. Symbol 123I.
iodine 125 a radioisotope of iodine having a half-life of 60.14 days and emitting gamma rays; used as a label in radioimmunoassays and other in vitro tests, and also for thyroid imaging. Symbol 125I.
iodine 131 a radioactive isotope of iodine having a half-life of 8.04 days and emitting beta particles and gamma rays. It is used as a tracer in diagnostic imaging and as a radiation source in radiation therapy. Symbol 131I.
radioactive iodine radioiodine.
iodine solution a transparent, reddish brown liquid, each 100 ml of which contains 1.8 to 2.2 g of iodine and 2.1 to 2.6 g of sodium iodide; a local antiinfective agent.
strong iodine solution Lugol's solution.
A solution of iodine or potassium iodine used as a source of iodine.
See also: solution
a chemical element, atomic number 53, atomic weight 126.904, symbol I. See Table 6. Iodine is essential in nutrition, being especially prevalent in the colloid of the thyroid gland. It is used in the treatment of hypothyroidism and as a topical antiseptic. Iodine is a frequent cause of poisoning. See also iodism.
a radioisotope of iodine having a half-life of 60 days and a principal gamma-ray photon energy of 28 keV; used as a label in radioimmunoassays and other in vitro tests, and also for thyroid imaging. Symbol 125I.
a radioisotope which concentrates in chromaffin cells; used in diagnostic scintigraphy, e.g. in cases of pheochromocytoma.
a radioisotope of iodine having a half-life of 8.1 days and a principal gamma-ray photon energy of 364 keV; used in treatment of hyperthyroidism and carcinoma of the thyroid, in thyroid function testing, and in imaging of the thyroid gland and other organs. Symbol 131I.
may occur in all species under certain conditions; in dogs and cats, a factor in all-meat diets. See also goiter.
iodine contrast agents
iodine salts are opaque to x-rays; therefore they can be combined with other compounds and used as contrast media in diagnostic x-ray examinations.
iodine nutritional deficiency
is characterized by goiter, neonatal mortality and alopecia.
occurs usually due to accidental overdosing. It causes lacrimation, anorexia, coughing due to bronchopneumonia, and a heavy dandruff. Paradoxically, iodine excess may result in thyroid hyperplasia and goiter, especially in the young.
a test of thyroid function. See also protein-bound iodine (PBI) test.
see iodine-125, iodine-131 (above).
iodine residues in milk
careless use of iodine-based teat dips results in unacceptable residues of iodine in milk.
contains 2% free iodine and 2.4% sodium iodide in an aqueous solution.
iodine solution (strong)
contains 5% free iodine and 10% potassium iodide in an aqueous solution.
the selective absorption of iodine from the circulation by the thyroid gland.
1. a liquid preparation of one or more soluble chemical substances usually dissolved in water.
2. the process of dissolving or disrupting.
one in which water is used as the solvent.
one that resists appreciable change in its hydrogen ion concentration (pH) when acid or alkali is added to it.
colloid solution, colloidal solution
a preparation consisting of minute particles of matter suspended in a solvent.
one having a greater specific gravity than a standard of reference.
one having an osmotic pressure greater than that of a standard of reference.
one having a specific gravity less than that of a standard of reference.
one having an osmotic pressure less than that of a standard of reference.
a transparent, reddish brown liquid, each 100 ml of which contains 1.8 to 2.2 g of iodine and 2.1 to 2.6 g of sodium iodide; a local anti-infective.
iodine solution (strong)
a solution having the same specific gravity as a standard of reference.
one having an osmotic pressure the same as that of a standard of reference.
a solution each liter of which contains 1 mole of the dissolved substance; designated 1 M. The concentration of other solutions may be expressed in relation to that of molar solutions as tenth-molar (0.1 M), etc.
a solution each liter of which contains 1 chemical equivalent of the dissolved substance; designated 1 N.
a sterile solution, free from foreign particles, for instillation into the eye.
physiological saline solution, physiological salt solution, physiological sodium chloride solution
an aqueous solution of sodium chloride and other components, having an osmotic pressure identical to that of blood serum.
the fluid used to fill tubing and the reservoir of a cardiac bypass unit before use.
a solution of sodium chloride, or common salt, in purified water.
a solution in which the solvent has taken up all of the dissolved substance that it can hold in solution.
one containing an irritant substance that will cause obliteration of a space, such as the lumen of a varicose vein or the cavity of a hernial sac.
one containing a fixed amount of solute.
one containing a greater quantity of the solute than the solvent can hold in solution under ordinary conditions.
one that contains a specific quantity of solvent per stated unit of volume.