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1. Electrical impedance measurement on plants: a review with some insights to other fields

Author:
Vozáry, Eszter,   et al.   ; Jócsák, Ildikó; Végvári, György;     Show all 3 Authors
Source:
Theoretical and Experimental Plant Physiology 2019 v.31 no.3 pp. 359-375
ISSN:
2197-0025
Subject:
dielectric spectroscopy; electric impedance; physiological state; plant stress
Abstract:
... Electrical impedance spectroscopy (EIS) is a useful tool for the investigation of the structural characteristics of solid materials and also biological tissues. The structural changes in plant or animal tissues reflect the physiological state of the organism. Electrical impedance measurement seems to be applicable both for analytical and research laboratories, since once a stress or a quality trai ...
DOI:
10.1007/s40626-019-00152-y

2. Evaluation of relaxation and creep curve by application of peleg linearization and prony series

Author:
Vozáry, Eszter,   et al.   ; Mohos, Ferenc Á.;     Show all 2 Author
Source:
Progress in agricultural engineering sciences 2018 v.14 no.1 pp. 61-75
ISSN:
1787-0321
Subject:
apples; models; rheological properties; wines
Abstract:
... In practice, there is a demand for quick characterization of rheological properties of food materials. The exact model calculation requires complex and long-term mathematical process. In this work, a simple, quick linearization method – the Peleg linearization – is discussed and is compared with the Prony series method. In the Peleg linearization only two constants are used, one of them gives the ...
DOI:
10.1556/446.14.2018.1.3

3. Electrical impedance phase angle as an indicator of plant root stress

Author:
Vozáry, Eszter,   et al.   ; Cseresnyés, Imre; Rajkai, Kálmán; Takács, Tünde;     Show all 4 Authors
Source:
Biosystems engineering 2018 v.169 pp. 226-232
ISSN:
1537-5110
Subject:
apoplast; biomass; cadmium; cell membranes; corn; crop-weed competition; dielectric properties; drought; electric current; electric impedance; electrodes; endodermis; lignin; monitoring; physicochemical properties; plant development; plant response; root systems; roots; shoots; soybeans; stress response; suberin; symplast; wheat
Abstract:
... This study aimed to demonstrate that single-frequency (1 kHz) measurement of impedance phase angle (Φ) in root–soil systems is suitable for monitoring plant responses to environmental stresses. Potted wheat, soybean and maize plants were exposed to cadmium contamination, alkaline stress, drought or weed competition. Φ was detected at regular intervals between a ground and a plant electrode during ...
DOI:
10.1016/j.biosystemseng.2018.03.004

4. An improved formula for evaluating electrical capacitance using the dissipation factor

Author:
Vozáry, Eszter,   et al.   ; Cseresnyés, Imre; Kabos, Sándor; Takács, Tünde; Végh, Krisztina R.; Rajkai, Kálmán;     Show all 6 Authors
Source:
Plant and soil 2017 v.419 no.1-2 pp. 237-256
ISSN:
0032-079X
Subject:
Arenosols; Chernozems; capacitance; dielectric properties; growing media; pumice; root systems
Abstract:
... BACKGROUND AND AIMS: The measurement of electrical capacitance in root–soil system (CR) is a useful method for estimating the root system size (RSS) in situ; however, CR–RSS regressions are often poor. It was hypothesized that this weak relationships could be partly due to the variable energy-loss rate, indicated by the dissipation factor (DF). METHODS: The values of CR and the associated DF were ...
DOI:
10.1007/s11104-017-3336-4

5. Relationship between moisture content and electrical impedance of carrot slices during drying

Author:
Vozáry, Eszter,   et al.   ; Kertész, Ákos; Hlaváčová, Zuzana; Staroňová, Lenka;     Show all 4 Authors
Source:
International agrophysics 2015 v.29 no.1 pp. 61-66
ISSN:
2300-8725
Subject:
physiological state; fruits; food quality; air; water content; carrots; drying; weight loss; tissues
Abstract:
... Electrical properties of food materials can give information about the inner structure and physiological state of biological tissues. Generally, the process of drying of fruits and vegetables is followed by weight loss. The aim of this study was to measure the impedance spectra of carrot slices during drying and to correlate impedance parameters to moisture content in different drying periods. Cyl ...
DOI:
10.1515/intag-2015-0013

6. Cadmium- and Flood-Induced Anoxia Stress in Pea Roots Measured by Electrical Impedance

Author:
Vozáry, Eszter,   et al.   ; Jócsák, Ildikó; Droppa, Magdolna; Horváth, Gábor; Bóka, Károly;     Show all 5 Authors
Source:
Zeitschrift für Naturforschung 2014 v.65 no.1-2 pp. 95-102
ISSN:
1865-7125
Subject:
plant tissues; peas; cell walls; heavy metals; seedlings; electrodes; cadmium; capacitance; hypoxia; roots
Abstract:
... Electrical impedance measurement - complex resistance in the presence of alternating current - is a useful tool for the investigation of structural characteristics of solid materials but also for plant tissues. This measurement is easily done: only two electrodes are inserted into the plant tissue, so it can be considered as a non-invasive technique and it may be a successful method for detecting ...
DOI:
10.1515/znc-2010-1-216

7. Connection between Moisture Content and Electrical Parameters of Apple Slices during Drying

Author:
Vozáry, Eszter,   et al.   ; Mészáros, Péter; B. Funk, David;     Show all 3 Authors
Source:
Progress in agricultural engineering sciences 2005 v.1 no.1 pp. 95-121
ISSN:
1786-335X
Subject:
fruits; apples; dielectric spectroscopy; water content; drying; weight loss; tissues
Abstract:
... Generally the drying process of fruits is followed by weight loss. The weight loss characterizes only the global moisture content of fruits and does not give information about the inner state of tissue. Electrical impedance spectroscopy of biological tissues shows ab-dispersion band that is associated ...
DOI:
10.1556/Progress.1.2005.1.6