water-resistant enamel
31Oral hygiene — is the practice of keeping the mouth and teeth clean to prevent dental problems, especially the common dental caries and gingivitis, and bad breath. There are oral pathologic conditions in which a good oral hygiene is required for healing and… …
32Dealkalization — is a process of surface modification applicable to glasses containing alkali ions, wherein a thin surface layer is created that has a lower concentration of alkali ions than is present in the underlying, bulk glass. This change in surface… …
33Etching — For other uses of etch or etching, see Etching (disambiguation), for the history of the method, see old master prints. The Soldier and his Wife. Etching by Daniel Hopfer, who is believed to have been the first to apply the technique to… …
34bacteria — bacterial, adj. bacterially, adv. /bak tear ee euh/, n.pl., sing. bacterium / tear ee euhm/. ubiquitous one celled organisms, spherical, spiral, or rod shaped and appearing singly or in chains, comprising the Schizomycota, a phylum of the kingdom …
35aluminum processing — Introduction preparation of the ore for use in various products. Aluminum, or aluminium (Al), is a silvery white metal with a melting point of 660° C (1,220° F) and a density of 2.7 grams per cubic centimetre. The most abundant… …
36Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… …
37Lacquer — For items made with lacquer, see Lacquerware. Lacquer box with inlaid mother of pearl peony decor, Ming Dynasty, 16th century In a general sense, lacquer is a somewhat imprecise term for a clear or coloured varnish that dries by solvent… …
38Whiteboard — This article is about physical whiteboards. For software based whiteboards, see Whiteboarding. A blank whiteboard A whiteboard (also known by the terms markerboard, dry erase board, dry wipe board, pen board, and the misnomer greaseboard) is a… …
39Edmontosaurus — Chordata Edmontosaurus Temporal range: Late Cretaceous, 73.0–65.5 Ma …
40Molybdenum — niobium ← molybdenum → technetium Cr ↑ Mo ↓ W …
