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. Author manuscript; available in PMC: 2023 Sep 21.
Published in final edited form as: Magn Reson Med. 2005 Jul;54(1):79–86. doi: 10.1002/mrm.20565

FIG. 8.

FIG. 8.

Cell growth and volume cell fractions as a function of time. Cell growth was determined by the increase in the ratio of β-NTP signal (normalized to the external standard, 3-APP) over time (■, left side scale). The cell volume fractions derived from the 1H spectrum in presence of Gd-DTPA (○, right side scale), are defined as the ratio of the unshifted signal to shifted signals The cell volume fractions derived from the 31P spectrum of DMMP (●, right side scale) are defined as the ratio of the upfield signal (extracellular) to downfield signals (intracellular).