Science: v.1-v.219

acid activity addition American amount animals appears associated blood caused cells Center changes chemical communication complete concentration containing continuous cultures Department determined direct discussion effect energy enzyme experiments field findings fraction given growth human Illus important increase indicated Institute interest International laboratory less light major material means measured mechanism ment minutes nature normal Notes observed obtained occur operation organic percent period physical polarization position possible prepared present Press problems production protein range reaction recent References region relative reported response samples Science scientific scientists shown signal similar specific structure suggested surface Table tion tissue United University volume write York