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Polycarbonate is commonly used in eye protection, as well as in other projectile-resistant viewing and lighting applications that would normally indicate the use of glass, but require much higher impact-resistance. Polycarbonate lenses also protect the eye from UV light.
A polycarbonate is an oxocarbon dianion consisting of a chain of carbonate units, where successive carbonyl groups are directly linked to each other by shared additional oxygen atoms. That is, they are the conjugate bases of polycarbonic acids , the conceptual anhydrides of carbonic acid , or polymers of carbon dioxide .
Drug precursors, also referred to as precursor chemicals or simply precursors, are substances used to manufacture illicit drugs. Most precursors also have legitimate commercial uses and are legally used in a wide variety of industrial processes and consumer products, such as medicines, flavourings, and fragrances.
New Ace Korean Language Dictionary DIOTEK Available worldwide define 한국어 [m] Portuguese (Brazil) Houaiss Dictionary of the Portuguese Language: Editora Objetiva: Available worldwide define alho [n] [o] Russian: Dictionary of the Russian Language (Ozhegov) "Universe and Education" Publishing House Ltd. Available worldwide define ...
The word plastic derives from the Ancient Greek πλαστικός (plastikos), meaning 'capable of being shaped or molded'; in turn, it is from πλαστός (plastos) meaning 'molded'. [10] As a noun , the word most commonly refers to the solid products of petrochemical-derived manufacturing.
Precursor (chemistry), a compound that participates in the chemical reaction that produces another compound; Precursor (physics), a phenomenon of wave propagation in dispersive media; Precursor in the course of a disease, a state preceding a particular stage in that course; Precursor cell (biology), a unipotent stem cell
The Collins COBUILD Advanced Dictionary [1] (CCAD) from HarperCollins, first published in 1987, [2] is a dictionary that distinguished itself by providing definitions in full sentences, rather than excerpted phrases. Example sentences are given for almost every meaning of every word, drawn from a large corpus of actual usage.
In chemistry, a precursor is a compound that participates in a chemical reaction that produces another compound. In biochemistry , the term "precursor" often refers more specifically to a chemical compound preceding another in a metabolic pathway , such as a protein precursor .