Science

Uranium Definition Uranium is a heavy, silvery-white, highly toxic, radioactive metallic element of the actinide series. It has 14 known isotopes, of which U 238…

Osteoporosis Definition Osteoporosis is a bone disease characterized by decrease in bone mass and density, resulting in a predisposition to fractures and bone deformities such…

Erbium Definition Erbium is a soft malleable silvery-white element of the lanthanide series of metals: used in special alloys, room-temperature lasers, and as a pigment.…

Arsenic Definition Arsenic is a metalloid element most commonly occurring as a gray crystal, but also found as a yellow crystal and in other forms.…

Sodium Sulfate Definition Sodium sulfate is a white crystalline compound used as a mild natural laxative and in larger doses as a hydragogue cathartic. Its…

Androgen Receptor Definition Androgen receptor is a key mediator of androgen function within normal and malignant prostate cells. It is mainly expressed in androgen target…

Sodium Silicate Definition Sodium silicate is a white amorphous (without crystalline structure) solid with the physical properties listed above. Other forms of sodium silicate range…

Xenotime Definition Xenotime is a phosphate mineral, similar to monazite except enriched in the heavy lanthanides and yttrium. It is a rare earth phosphate mineral.…

Magnesium Oxide Definition Magnesium oxide is the oxide salt of magnesium with antacid, laxative and vascular smooth muscle relaxant activities. It is an inorganic compound…

Transcription Factor Definition Transcription factors (TFs) are proteins that regulate the transcription of genes—that is, their copying into RNA, on the way to making a…

Magnesium Carbonate Definition Magnesium carbonate (MgCO3) is a white or brown crystalline solid or crystalline powdery compound that occurs naturally as dolomite and magnesite and…

What is Permafrost? Permafrost is a thick subsurface layer of soil that remains frozen throughout the year, occurring chiefly in Polar Regions. It is defined…