Mathematically, the pI for an acidic amino acid is the average of pKa 1 and pKa R (the pKa of the dissociable proton in the R group); for a basic amino acid, it is the average of pKa 2 and pKa R.here is no dissociable proton in the R group. This type of amino acid is called a âsimple amino acidâ. A simple amino acid is electrically neutral under physiological conditions. NOTE: Under this definition it is possible to have a simple amino acid which is triprotic.
Sent through a supposedly secure channel devoted to peace negotiations (a transatlantic cable belonging to Scandinavia) on January 19th 1917, the 'Zimmermann Telegram' â often called the Zimmermann Note-was a memo sent from the German Foreign Minister Arthur Zimmermann to the German Ambassador to Mexico.
Some of those in the United States who still held out for neutrality at first claimed the telegram was a fake. This notion was dispelled two days later, when Zimmermann himself confirmed its authenticity. Public opinion in the United States now swung firmly toward American entrance into World War I.