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A laboratory centrifuge is a piece of laboratory equipment, driven by a motor, which spins liquid samples at high speed. There are various types of centrifuges, depending on the size and the sample capacity.〔Susan R. Mikkelsen & Eduardo Cortón. Bioanalytical Chemistry, Ch. 13. Centrifugation Methods. John Wiley & Sons, Mar 4, 2004, pp. 247-267.〕 Like all other centrifuges, laboratory centrifuges work by the sedimentation principle, where the centripetal acceleration is used to separate substances of greater and lesser density. ==Types== There are various types of centrifugation: *Differential centrifugation, often used to separate certain organelles from whole cells for further analysis of specific parts of cells *Isopycnic centrifugation, often used to isolate nucleic acids such as DNA *Sucrose gradient centrifugation, often used to purify enveloped viruses and ribosomes, and also to separate cell organelles from crude cellular extracts There are different types of laboratory centrifuges: * Microcentrifuges (devices for small tubes from 0.2 ml to 2.0 ml (micro tubes), up to 96 well-plates, compact design, small footprint; up to 30,000 g) * Clinical centrifuges (moderate-speed devices used for clinical applications like blood collection tubes) * Multipurpose high-speed centrifuges (devices for a broad range of tube sizes, high variability, big footprint) * Ultracentrifuges (analytical and preparative models) Because of the heat generated by air friction (even in ultracentrifuges, where the rotor operates in a good vacuum), and the frequent necessity of maintaining samples at a given temperature, many types of laboratory centrifuges are refrigerated and temperature regulated. There are different providers of laboratory centrifuges like Eppendorf, Thermo-Heraeus, Thermo-Sorvall, Hettich, Beckmann-Coulter, MSE, Sigma and AWEL International. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Laboratory centrifuge」の詳細全文を読む スポンサード リンク
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