Wednesday, July 10, 2013
polyurethane
A polyurethane (PUR and PU) is any polymer composed of a chain of organic units joined by carbamate (urethane) links. Polyurethane polymers are formed through step-growth polymerization, by reacting a monomer (with at least two isocyanate functional groups) with another monomer (with at least two hydroxyl or alcohol groups) in the presence of a catalyst.
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synanthrope
A synanthrope (from ancient Greek σύν sýn "together, with" and ἄνθρωπος ánthrōpos "man") is an organism that evolve...
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A kouros (plural kouroi , Ancient Greek κοῦρος ) is the modern term given to those representations of male youths which first appear i... -
Epigraphy (from the Greek : ἐπιγραφή epi-graphē , literally "on-writing", "inscription") is the study of inscriptions ...
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