the recent introduction of ( 31 ) p nuclear magnetic resonance spectroscopy offers a new approach to the problem of obtaining a simultaneous and direct evaluation of both the cytoplasmic and vacuolar ph in higher plant cells ( j. k. m. roberts , p.m. ray , n. waderlardetzky and o. sardetzky , 1980 , nature 283 , 870-872 ; 1981 , planta 152 , 74-78 ) .
C0010834
cytoplasmic
C0042219
vacuolar