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PI may refer to: == Science == * Isoelectric point, the pH at which a particular molecule or surface carries no net electrical charge. * Parental investment, in evolutionary biology * Paternity Index, a value used to calculate probability of paternity * Phosphatidylinositol, a class of lipids * ''Pistillata'', a gene that influences the development of flowers in the ABC model of flower development * Plasticity index, a measure of the plasticity of a soil * Polyimide, a polymer of imide monomers * Ponderal index, a measure of leanness of a person (similar to body mass index) * Principal investigator, the lead scientist or engineer for a particular project * Propidium iodide, a chemical used as a DNA stain * Protease inhibitor (pharmacology), class of drugs used to treat or prevent infection by viruses, including HIV and Hepatitis C * Protease inhibitor (biology), molecules that inhibit the function of proteases * Pulsatility index, a ratio of blood flow rates 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「PI」の詳細全文を読む スポンサード リンク
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