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Titolo:
MRI-based D2O/H2O-contrast method to study water flow and distribution in heterogeneous systems: Demonstration in wood xylem
Autore:
Ilvonen, K; Palva, L; Peramaki, M; Joensuu, R; Sepponen, R;
Indirizzi:
Helsinki Univ Technol, Appl Elect Lab, Helsinki 02015, Finland Helsinki Univ Technol Helsinki Finland 02015 ab, Helsinki 02015, Finland Univ Helsinki, Dept Forest Ecol, FIN-00014 Helsinki, Finland Univ Helsinki Helsinki Finland FIN-00014 ol, FIN-00014 Helsinki, Finland
Titolo Testata:
JOURNAL OF MAGNETIC RESONANCE
fascicolo: 1, volume: 149, anno: 2001,
pagine: 36 - 44
SICI:
1090-7807(200103)149:1<36:MDMTSW>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC-RESONANCE; NMR-MICROSCOPY; SAP-FLOW; HIGH-RESOLUTION; PLANT-TISSUES; POROUS-MEDIA; STEMS; TRANSPORT; IMAGES; PINE;
Keywords:
MRI; deuterium oxide (D2O); contrast indicator; heterogeneous system; water flow;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Ilvonen, K Helsinki Univ Technol, Appl Elect Lab, POB 3000, Helsinki 02015, Finland Helsinki Univ Technol POB 3000 Helsinki Finland 02015 Finland
Citazione:
K. Ilvonen et al., "MRI-based D2O/H2O-contrast method to study water flow and distribution in heterogeneous systems: Demonstration in wood xylem", J MAGN RES, 149(1), 2001, pp. 36-44

Abstract

We demonstrate a method for examining water flow and distribution within heterogeneous systems by means of MRI and deuterium oxide (D2O)/water (H2O) contrast. In this demonstration a piece of a pine tree was used. In pine xylem, water flows in tube-like dead cells, that is, tracheids, which are about 10-40 mum in diameter and 1-4 mm in length. Water how in tracheids of a piece of a pine branch was studied by means of D2O-H2O contrast obtained with MRI at 1.5 T. D2O flowing through the object caused reduction of signal when H-1 detection was used. Observed how velocity in the compression wood was about one-third of that in the tension wood, the former having a smaller average cell lumen size than the latter. After the signal in the entire cross section was reduced to its minimum, the experiment was renewed with distilled H2O. Flow of the H2O and hence replacement of D2O through the wood resulted in the return of the signal. This study demonstrates the dependence of the flow velocity on the cell lumen size. The results suggest that D2O/H2O contrast obtained with MRI is an effective tool for studies of water dynamics within heterogeneous systems. (C) 2001 Academic Press.

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Documento generato il 23/01/21 alle ore 09:03:30