Do you have dementia? You have been told these. You have been given links to scientific papers outlining the three methods.Again, I'm talking about the traditional definition that is used in regular dictionaries. Quoting one:
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To identify or distinguish as a separate entity or group.
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Source:
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If you're talking about virology, name these 3 different methods.
cell culture, centrifuge, filtration.

Methods for the isolation of viruses from environmental samples - PubMed
Viruses are omnipresent and extraordinarily abundant in the microbial ecosystems of water, soil, and sediment. In nearly every reported case for aquatic and porous media environments (soils and sediments) viral abundance exceeds that of co-occurring host populations by 10-100-fold. If current...

Methods to Study Viruses - PMC
This chapter describes methods for growing, purifying, counting, and characterizing viruses. It also provides general principles of diagnostic virology. As obligate intracellular parasites, viruses require cell in which to replicate. The cells must ...
