Science

Peripheral Nervous System Definition Peripheral nervous system (PNS) is the part of the nervous system in vertebrate animals that lies outside of the brain and…

Nickel Definition Nickel is a silvery, hard, ductile metallic element that occurs in ores along with iron or magnesium. It occurs sparingly in nature in…

Propylene Oxide Definition Propylene oxide is a chemical compound that is organic in nature and acts as a chemical intermediate in many chemical processes used…

Chromite Definition Chromite is a brownish-black mineral consisting of a ferrous chromic oxide in cubic crystalline form, occurring principally in basic igneous rocks: the only…

Myelin Protein Zero Definition Myelin protein zero (PO, MPZ) is a glycoprotein which in humans is encoded by the MPZ gene. This gene is specifically…

Axioms of Algebra An Axiom is a mathematical statement that is assumed to be true. There are five basic axioms of algebra. Axioms are generally…

Propylene Glycol Definition Propylene glycol is a colorless, viscous liquid used in antifreeze solutions, in hydraulic fluids, and as a solvent. Unlike ethylene glycol, it…

Lava Tube Definition Lava tubes are the longest and most complicated of volcanic caves. They are the channels of rivers of lava that at some…

Oligodendrocyte Definition Oligodendrocyte is any of the neuroglial cells of the central nervous system that are responsible for the formation of myelin sheaths in the…

Volcanic Rock Definition Volcanic rock is an igneous rock of volcanic origin. It differs from other igneous rock by being of volcanic origin. Volcanic rocks…

Fermentation Definition Fermentation is a chemical reaction in which sugars are broken down into smaller molecules that can be used in living systems. Alcoholic beverages,…

Dendritic Spine Definition Dendritic spines are a preferential site of synaptic axodendritic contact; they are sparse or absent in some types of nerve cells (motor…