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Phosphorus NMR microscopy (scanning or imaging NMR) has been used noninvasively to measure the distribution of phosphate in the midgut of a lepidopteran larva, Spodoptera litura (Noctuidae). The technical background of the method is outlined and resolution to a pixel size of 0.39 mm 2 was obtained. It was demonstrated that there are both radial and longitudinal pH gradients within the digestive...
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