The Study of Transport of Substances in the Plant Stems

The Study of Transport of Substances in the Plant Stems

Článek recenzovaný mimo WoS a Scopus

Monitoring of tissue structures of Euphorbia plants in non-destructive manner is possible using nuclear magnetic resonance-based tracking of angular momentum and the responses of nuclei placed in a magnetic field with defined induction and interaction with high-frequency electromagnetic waves. Characteristics of the response are dependent on the method of appli-cation of series of radiofrequency pulses. After the finish of phenomenon the resulting signal is detected by the receiving coil of tomograph. Measured plant is sensed by magnetic resonance imaging in several slices oriented perpendicular to the axis of the stem of the plant. The slices are designed in the same distances between them from the bottom of the root to the top edge of the plant. There is only part of the plant in the working area of the tomograph during the measurement. The measurements are chosen using sensing techniques called spin echo and in-version recovery method. The acquired images are weighted by relaxation times T1 for spin echo method respectively by T2 for inversion recovery method. Pictures weighted by relaxation times are evaluated in the program Marevisi manually to determine vascular structure of plants. Longer relaxation times correspond to places where there is a greater presence of water. Contrasts in the image correspond to the chemical bonds in nutritive substances, viscosity agents and mobility of molecules.

Monitoring of tissue structures of Euphorbia plants in non-destructive manner is possible using nuclear magnetic resonance-based tracking of angular momentum and the responses of nuclei placed in a magnetic field with defined induction and interaction with high-frequency electromagnetic waves. Characteristics of the response are dependent on the method of appli-cation of series of radiofrequency pulses. After the finish of phenomenon the resulting signal is detected by the receiving coil of tomograph. Measured plant is sensed by magnetic resonance imaging in several slices oriented perpendicular to the axis of the stem of the plant. The slices are designed in the same distances between them from the bottom of the root to the top edge of the plant. There is only part of the plant in the working area of the tomograph during the measurement. The measurements are chosen using sensing techniques called spin echo and in-version recovery method. The acquired images are weighted by relaxation times T1 for spin echo method respectively by T2 for inversion recovery method. Pictures weighted by relaxation times are evaluated in the program Marevisi manually to determine vascular structure of plants. Longer relaxation times correspond to places where there is a greater presence of water. Contrasts in the image correspond to the chemical bonds in nutritive substances, viscosity agents and mobility of molecules.

Euphorbia, NMR, plant stems, relaxation times

Euphorbia, NMR, plant stems, relaxation times

POKLUDOVÁ, M.; KŘÍŽ, T.

2012

12.09.2011

1559-9450

Progress In Electromagnetics

2011

2011

Spojené státy americké

986

989

4