hydrogen-deficient gas oil
21Space colonization — Artist Les Bossinas 1989 concept of Mars mission Space colonization (also called space settlement, space humanization, or space habitation) is the concept of permanent human habitation outside of Earth. Although hypothetical at the present time,… …
22Alkylation — Alkylating agent redirects here. For the class of drugs, see alkylating antineoplastic agent. Alkylation is the transfer of an alkyl group from one molecule to another. The alkyl group may be transferred as an alkyl carbocation, a free radical, a …
23international relations — a branch of political science dealing with the relations between nations. [1970 75] * * * Study of the relations of states with each other and with international organizations and certain subnational entities (e.g., bureaucracies and political… …
24Rubidium — krypton ← rubidium → strontium K ↑ Rb ↓ …
25Potassium — (pronEng|pəˈtæsiəm) is a chemical element. It has the symbol K ( la. kalium, from ar. qalīy), atomic number 19, and atomic mass 39.0983. The name potassium comes from the word potash , as potassium was first isolated from potash. Potassium is a… …
26Methamphetamine — Meth and Tik redirect here. For other uses, see Meth (disambiguation) and Tik (disambiguation). This article is about the psychostimulant drug, methamphetamine, in both racemic and dextrorotatory forms. For the CNS inactive OTC nasal decongestant …
27Garlic — For other uses, see Garlic (disambiguation). Garlic Allium sativum, known as garlic, from William Woodville, Medical Botany, 1793. Scientific classification …
28Persistent carbene — A stable carbene: isolated 1,3 dimesitylimidazol 2 ylidene in a Schlenk flask (stir bar also present). A persistent carbene (also known as stable carbene or Arduengo carbene) is a type of carbene demonstrating particular stability. The best known …
29sensory reception, human — Introduction means by which humans react to changes in external and internal environments. Ancient philosophers called the human senses “the windows of the soul,” and Aristotle described at least five senses sight, hearing, smell, taste, and… …
30Bromine — (pronEng|ˈbroʊmiːn/, /ˈbroʊmaɪn/, /ˈbroʊmɪn, el. βρῶμος, brómos , meaning stench (of he goats) Gemoll W, Vretska K: Griechisch Deutsches Schul und Handwörterbuch ( Greek German dictionary ), 9th ed., published by [http://www.oebvhpt.at/ öbvhpt] …
