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AAAS acid action activity addition American analysis animals appears applications Association biological cells Center chairman chemical chemistry chromatography complete containing crystals cytoplasm Department designed determined direction discussion effect electron engineering experiments field function human important increase indicated Institute interest International laboratory light lipid magnetic material means measurements mechanism Medical meeting ment methods Michigan Model natural observed obtained occur operation organic origin percent physical plant position possible potential present Press problems produced range recent recorded References region reported samples School Science scientific scientists similar single Society space species standard structure studies suggest surface temperature tion United Univ University volume Washington write York