Two different pulse sequences used in 1H NMR spectroscopy termed free induction decay amplitude recovery (FIDAR) and spin-echo recovery (SER) were applied to studies of transport of paramagnetic ions in multicellular systems. The molar relaxivity of several paramagnetic species (Fe3+, Co2+, Ni2+, Cu2+, Mn2+, MnEDTA2-, dextran-magnetite) in water solutions was measured at 32 MHz resonance frequency. Ionic transport was studied using Mn2+ and MnEDTA2- as models for cations and anions, respectively, and plant root tissue as a model of a multicellular system.
Algorithms Biological Transport