purifying

I'm not sure what re-purifying costs, lots I suspect.

As the article notes, we're already purifying sewage from cities upstream.

We're talking about nonsense DNA that does not have any purifying selection pressure, ie. it does not encode any useful or critical protein for the organism.

Hitler was not only a vegetarian, he was a health fanatic, and there's evidence that it informed his obsession with purifying the race.

That you can do, but it's less effective because separating and purifying different elements is much easier than doing so with different isotopes.

I treasure and trust StackOverflow for my programming questions precisely because of the elitist, purifying attitude.

This reminds me also of the idea of warfare as a force purifying yourself personally from the mundane failures of personality and habit that frustrate you day-to-day.

Current revelations aside, when agencies are prohibited by law from engaging in certain kinds of surveillance, looping other countries in can be a way of purifying the information they desire.

The utility here is that if you're a medical researcher you can just order up this stuff for your research lab in a bottle, so to speak, instead of going through the tortuous business of isolating and purifying it in useful quantities.

That would help up to a point, but there also ongoing research to manufacture it using recombinant techniques - that is, genetically engineering bacteria to produce the required protein product and then purifying it out.