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In phase-partition fixation, tissue is immersed in a non-aqueous solvent at equilibrium with an aqueous solution of a fixing agent to minimize osmotic effects. Preservation of morphology afforded by phase-partition fixation using formalin and glutaraldehyde and several organic solvents was compared to aqueous 10% neutral buffered formalin fixation for five tissues. It was shown that phase-partition fixation can provide excellent fixation for light microscopy if the proper combinations of fixatives and solvents are used.
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Nettleton et al. (1986) studied this question.
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