It takes a long time to achieve de facto deprecation of a unit. If the amu was replaced by the dalton in 1961, no one reached the authors of my first science textbooks or teachers with the news (1965). In fact, I never heard of the dalton until the mid-seventies, so we shall probably continue struggling with that old name for Celsius for a while to come, too, even 65 years after its deprecation.
Paul Trusten, Reg. Pharmacist Vice President U.S. Metric Association, Inc. Midland, Texas USA www.metric.org +1(432)528-7724 [email protected] On Apr 8, 2013, at 20:29, Michael Payne <[email protected]> wrote: > Interesting Unit at http://en.wikipedia.org/wiki/Insulin-like_growth_factor_1 > > forth paragraph down: > > IGF-1 consists of 70 amino acids in a single chain with three intramolecular > disulfide bridges. IGF-1 has a molecular weight of 7,649 daltons. > > There is another page on Daltons > http://en.wikipedia.org/wiki/Dalton_%28unit%29 A unit accepted for use with > SI, seems with the prefixes we have, some sub unit of a gram would have been > equally good. Or is this something like the Astronomical unit on the other > end of the scale? > > Michael Payne > >
