Laboratory centrifuges Hematocrit Ultracentrifuge centrifuge(Microcentr ifuges) They vary widely in 10,000 rpm 70,000 rpm speed and capacity Refrigerated centrifuges use for isolating and measuring packed separating solids from cell volume (PCV) liquids in a suspension. in blood isolate much smaller particles, including ribosomes, proteins, and viruses. And the study of membrane fractionation. for DNA, RNA, PCR or antibody analysis Temperature controls keys Don’t Contain Don’t Contain Contain ( -20C , – 40 C ) rpm Don't Contain 30,000 rpm