Response to Sheila Agawin, I am a relative novice with our FACS Vantage but have sucessfully sorted several phytoplankton species without difficulty. These included flagellates Olisthodiscus luteus, Prorocentrum triestinum, Gyrodinium aureolum and a picoplankter, Aureococcus anophagefferens. All survived sorts except for A. anophagefferens single cell ACDU isolation attempts. I usually use glass 100mm test tube with slip on caps for collection but plastic tubes have worked also. Tubes are filled about three quarters with media and positioned high in the tube holder. Cooling is not a problem because the unit is in an air conditioned room and I use several freezer packs in the collection compartment in lieu of setting up refrigeration. Dave Small, Becton-Dickinson, recommends varying sheath pressure. Good Luck!
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