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result sql = PFG-NMR study for evaluating freezing damage to onion tissue.
PFG-NMR study for evaluating freezing damage to onion tissue.
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char = h;code = 104
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char = m;code = 109
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char = r;code = 114
char = i;code = 105
char = l;code = 108
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char = t;code = 116
char = h;code = 104
char = r;code = 114
char = o;code = 111
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char = g;code = 103
char = h;code = 104
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char = d;code = 100
char = e;code = 101
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char = t;code = 116
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char = o;code = 111
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char = h;code = 104
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char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
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result sql = We assessed the damage to onion tissue due to freeze-thawing as the water permeability determined by using PFG-NMR and light microscopy. The water diffusion in fresh onion tissue was restricted due to cellular barriers, and the estimated water permeability was 6.99 x 10(-6)m/s. The water diffusion became considerably less restricted after freeze-thawing; the convergent value for the restricted diffusion coefficient increased and the water permeability significantly increased to 2.85 x 10(-5) m/s. While NMR could detect a distinct change in the diffusion behavior of water molecules in freeze-thawed tissue, light microscopy revealed no significant tissue damage. These results suggest that freeze-thawing damaged the vegetable tissues primarily through destruction of the cell membrane rather than the cell wall.

Publication: Biosci. Biotechnol. Biochem. 2009 Jun ;73(6)::1257-61.
Publication Date: 2009 Jun
Study Author(s): Ando, Hiroko;Fukuoka, Mika;Miyawaki, Osato;Watanabe, Manabu;Suzuki, Toru;
Institution: Department of Biological and Environmental Engineering, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan.
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We assessed the damage to onion tissue due to freeze-thawing as the water permeability determined by using PFG-NMR and light microscopy. The water diffusion in fresh onion tissue was restricted due to cellular barriers, and the estimated water permeability was 6.99 x 10(-6)m/s. The water diffusion became considerably less restricted after freeze-thawing; the convergent value for the restricted diffusion coefficient increased and the water permeability significantly increased to 2.85 x 10(-5) m/s. While NMR could detect a distinct change in the diffusion behavior of water molecules in freeze-thawed tissue, light microscopy revealed no significant tissue damage. These results suggest that freeze-thawing damaged the vegetable tissues primarily through destruction of the cell membrane rather than the cell wall.
PMID: 19502742

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