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2. Environmental factors For fluorescent observation of particles in snow samples, after the 500 �L solution of 70 samples of Mt. Tateyama was fixed with 1% paraformaldehyde solution, particles in the sample solutions were stained with 0.5 �g mL -1 DAPI (4',6-diamino-2-phenylindole) for 15 min and filtered through a 0.22 �m pore size polycarbonate filter;Russell;contrast, the filter-collecting aerosol References Abulaiti,1974
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