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Nile River, the longest river in the world, called the father of African rivers. It rises south of the Equator and flows northward through northeastern…

Neurotrophin Definition Neurotrophins (neurotrophic factors) are proteins which induce the survival of neurons and are found in the blood stream. Neurotrophins are capable of signaling…

Ammonium Definition Ammonium is a positively charged ion, NH4, derived from ammonia and found in a wide variety of organic and inorganic compounds. Compounds of…

Schwann cell Definition Schwann cell is any of the cells that cover the axons in the peripheral nervous system and form the myelin sheath. It…

Ethanium Definition Ethanium is a trypanocidal agent and possible antiviral agent that are widely used in experimental cell biology and biochemistry. Ethidium has several experimentally…

Basic Definitions Relating to Numbers Basic numbers are the haploid number of chromosomes; specifically the lowest haploid number of a polyploid series. Some key points…

Moissanite Definition Moissanite is a rare gem that has almost all of the qualities of a diamond. It was first discovered in 1893, with the…

Myelin Definition Myelin is a whitish, fatty substance that forms a sheath around many vertebrate nerve fibers. Myelin insulates the nerves and permits the rapid…

Silicon Carbide Definition Silicon carbide (SiC) is an extremely hard bluish-black insoluble crystalline substance produced by heating carbon with sand at a high temperature and…

Magic Acid Definition Magic acid is a superacid consisting of a mixture, most commonly in a 1:1 molar ratio, of fluorosulfuric acid (HSO3F) and antimony…

Neuroglia Definition Neuroglia is the delicate connective tissue which supports and binds together the nervous elements of the central nervous system. One part of it,…

Germanium Definition Germanium is a brittle, crystalline, grayish-white metalloid element that is found in coal, in zinc ores, and in several minerals. Its atomic number…