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Possible Answers:
PEN.
Last seen on: USA Today Crossword – Nov 26 2020
Random information on the term “Gel ___”:
2-Acrylamido-2-methylpropane sulfonic acid (AMPS) was a Trademark name by The Lubrizol Corporation. It is a reactive, hydrophilic, sulfonic acid acrylic monomer used to alter the chemical properties of wide variety of anionic polymers. In the 1970s, the earliest patents using this monomer were filed for acrylic fiber manufacturing. Today, there are over several thousands patents and publications involving use of AMPS in many areas including water treatment, oil field, construction chemicals, hydrogels for medical applications, personal care products, emulsion coatings, adhesives, and rheology modifiers.
AMPS is made by the Ritter reaction of acrylonitrile and isobutylene in the presence of sulfuric acid and water. The recent patent literature describes batch and continuous processes that produce AMPS in high purity (to 99.7%) and improved yield (up to 89%, based on isobutene) with the addition of liquid isobutene to an acrylonitrile / sulfuric acid / phosphoric acid mixture at 40°C.
Random information on the term “PEN”:
PEN International (known as International PEN until 2010) is a worldwide association of writers, founded in London in 1921 to promote friendship and intellectual co-operation among writers everywhere. The association has autonomous International PEN centers in over 100 countries.
Other goals included: to emphasise the role of literature in the development of mutual understanding and world culture; to fight for freedom of expression; and to act as a powerful voice on behalf of writers harassed, imprisoned and sometimes killed for their views.
The first PEN Club was founded in London in 1921 by Catherine Amy Dawson Scott, with John Galsworthy as its first president. Its first members included Joseph Conrad, Elizabeth Craig, George Bernard Shaw, and H. G. Wells.
PEN originally stood for “Poets, Essayists, Novelists”, but now stands for “Poets, Playwrights, Editors, Essayists, Novelists”, and includes writers of any form of literature, such as journalists and historians.