Enzymes are important to living things because they greatly increase the rate at which necessary chemical reactions happen in an organism. Enzymes basically are shaped in such a way that the reactants are put in position to react with each other much more quickly and efficiently than they would if they just randomly bumped into each other in an organism. In general, these are reactions that would indeed happen if the chemicals involved happened to come into contact with each other in exactly the right form; enzymes ensure that these necessary reactions happen, and far more quickly. They are biological catalysts--chemicals that speed up reactions. Enzymes are made of proteins, and are specific for a particular type of reaction. In other words, an enzyme that functions to help break down lipids in an organism would not help to break down proteins. Enzymes are also reusable--after doing their job, whatever that may be, the products leave the enzyme. The enzyme can then repeat its action.
Does anybody know the etymology of the phrase "sweet dreams"? I tried googling but did not find anything satisfying. Is this a relatively new phrase of the modern world or has this been in use for some time? I think it's the latter one. Answer The OED has the interjection as "a farewell to someone going to bed" from the 20th century: 1908 Sears Roebuck Catal. 198/1 Tenor Solos..Good Bye, Sweet Dreams, Good Bye. But it goes back until at least the 19th and possibly 18th centuries. John Wolcot, writing under the pseudonym of Peter Pindar, used it in his poem "Orson and Ellen; A Legendary Tale" published in 1801: Also from 1801 in The infernal Quixote (Page 287) by Charles Lucas: In the March 1776 of The Universal Magazine was published "The Serenade. A Pastoral Tale. From the German of Gesner" , where the shepherd Daphnis watches over his beloved as she sleeps and sings: The same tale appears in 1776's as Idyl XI, " Daphnis ...
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