polyvinyl alcohol
71Optical brightener — Optical brighteners, optical brightening agents (OBAs), fluorescent brightening agents (FBAs) or fluorescent whitening agents (FWAs) are dyes that absorb light in the ultraviolet and violet region (usually 340 370 nm) of the electromagnetic… …
72Ziegler-Natta catalyst — A Ziegler Natta catalyst is a reagent or a mixture of reagents used in the production of polymers of 1 alkenes (α olefins). Ziegler Natta catalysts are typically based on titanium compounds and organometallic aluminium compounds, for example… …
73Gel — For other uses, see Gel (disambiguation). An upturned vial of hair gel A gel (from the lat. gelu freezing, cold, ice or gelatus frozen, immobile) is a solid, jelly like material that can have properties ranging from soft and weak to hard and… …
74Biodegradation — Yellow slime mold growing on a bin of wet paper Biodegradation or biotic degradation or biotic decomposition is the chemical dissolution of materials by bacteria or other biological means. The term is often used in relation to ecology, waste… …
75Non-Newtonian fluid — Continuum mechanics …
76Polaroid — For the Polaroid instant camera, see instant camera. For the company, see Polaroid Corporation. For the Phantom Planet album, see Polaroid (Phantom Planet) Polaroid is the name of a type of synthetic plastic sheet which is used to polarize… …
77Postage stamp gum — In philately, gum is the substance applied to the back of a postage stamp to enable it to adhere to a letter or other mailed item. The term is generic, and applies both to traditional types such as gum arabic and to synthetic modern… …
78Banknote — Banknotes with a face value of 5000 of different currencies. two sides of 1 …
79Hysterectomy — Intervention ICD 9 CM 68.9 MeSH D007044 A hysterectomy (from Greek ὑστέρα hys …
80Photo emulsion — is a commonly used misnomer for a photosensitive substance used in screen printing that hardens when subjected to ultraviolet light. To prepare a screen for printing, it is coated with liquid photo emulsion and allowed to dry. Opaque,… …
