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The trade-off is that new water tends to be of lower quality (requiring more expensive purification) or far away (requiring more expensive transport).
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Ozone disinfection is one time-tested alternative, but is potentially more complicated and more expensive than chlorine purification.
Purification is far more expensive than the work in eggs, Dr. St said; a modest factory for human vaccine costs $100 million, and no veterinary manufacturer is ready to build one.
In this context, crystallization can partly replace other purification techniques, such as preparative chromatography which usually is more expensive and time-consuming.
DNA purification is even more sensitive, but requires a commercial kit and is more expensive and time-consuming.
The benzoyl bromide needed for the preparation of 6 is significantly more expensive than acetyl bromide (for 5), and the use of 6 further complicated extractive purifications of the initially formed monoesters.
Debt is more expensive.
Lobsters are more expensive.
Everything becomes more expensive.
— and commensurately more expensive.
One more expensive example.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com