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In organic synthesis, PPTS is used as a weakly acidic catalyst, providing an organic soluble source of pyridinium (C 5 H 5 NH +) ions.For example, PPTS is used to deprotect silyl ethers or tetrahydropyranyl ethers when a substrate is unstable to stronger acid catalysts.
PPTS may refer to: Palestine Pilgrims' Text Society, a Victorian academic society; Pulsed plasma thrusters, a type of spacecraft propulsion; Prospective Piloted ...
A pulsed plasma thruster (PPT), also known as a Pulsed Plasma Rocket (PPR), or as a plasma jet engine (PJE), is a form of electric spacecraft propulsion. [1] PPTs are generally considered the simplest form of electric spacecraft propulsion and were the first form of electric propulsion to be flown in space, having flown on two Soviet probes (Zond 2 and Zond 3) starting in 1964. [2]
On July 24, 2007, Slideshare introduced a format called "SlideCast" [10] [11] [12] to "make web multimedia using only a ppt file and an mp3". [11]According to Boutelle, the word slidecast is a portmanteau of "Slide show" and "podcasting".
Parts-per notation is often used describing dilute solutions in chemistry, for instance, the relative abundance of dissolved minerals or pollutants in water.The quantity "1 ppm" can be used for a mass fraction if a water-borne pollutant is present at one-millionth of a gram per gram of sample solution.
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