is part of many compounds like
71Chemical bond — A chemical bond is an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. The bond is caused by the electromagnetic force attraction between opposite charges, either between electrons and… …
72Water purification — This article is about large scale, municipal water purification. For portable/emergency water purification, see portable water purification. For industrial water purification, see deionized water. For distilled water, see distilled water. Water… …
73Sesotho nouns — Notes: *The orthography used in this and related articles is that of South Africa, not Lesotho. For a discussion of the differences between the two see the notes on Sesotho orthography. *Hovering the mouse cursor over most H:title| [ɪ talɪk] |… …
74Defense in insects — Biston betularia: the melanic carbonaria (left) and the more common light colored typica (right) Insects have a wide variety of predators, including birds, reptiles, amphibians …
75African architecture — Introduction the architecture of native Africa, particularly of sub Saharan Africa. In areas where Islam and Christianity linked Africa to the rest of the world in precolonial times, architecture predominates among the visual arts. Included …
76Kuiper belt — Known objects in the Kuiper belt, derived from data from the Minor Planet Center. Obje …
77NK1 receptor antagonist — Neurokinin 1 (NK1) antagonists are a novel class of medications that possesses unique antidepressant,[1] anxiolytic,[2] and antiemetic properties. The discovery of neurokinin 1 (NK1) receptor antagonists was a turning point in the prevention of… …
78sponge — spongeless, adj. spongelike, adj. spongingly, adv. /spunj/, n., v., sponged, sponging. n. 1. any aquatic, chiefly marine animal of the phylum Porifera, having a porous structure and usually a horny, siliceous or calcareous internal skeleton or… …
79Immune system — A scanning electron microscope image of a single neutrophil (yellow), engulfing anthrax bacteria (orange). An immune system is a system of biological structures and processes within an organism that protects against disease by identifying and… …
80Properties of water — H2O and HOH redirect here. For other uses, see H2O (disambiguation) and HOH (disambiguation). This article is about the physical and chemical properties of pure water. For general discussion and its distribution and importance in life, see Water …
