Electrical Impedance Analysis in Plant Tissues11

Zhang, M. I. N.; Willison, J. H. M.

doi:10.1093/jxb/42.11.1465

Cited by 108 publications

(87 citation statements)

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“…Heavy metal can change membrane capacitance as well as permittivity and conductivity of the cytoplasm. Dielectric spectroscopy of E.coli cell before and after exposure to heavy metals Cd2+, and Cu2+ was also investigated [6]. The same results were obtained.…”

Section: The Utilization Of Escherichia Coli-based Magnetic Nanobeads Asmentioning

confidence: 56%

The Utilization of Escherichia Coli-based Magnetic Nanobeads as An Ultrasensitive Biosensor for Mercucy

Sun¹

2011

IJEM

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It is an arduous task to detect the traces of heavy metals in real environmental samples. In this paper, the use of micro-organisms as bioreceptors and the merits of nanobeads' (NBs) properties are combined to develop a novel electrochemical biosensor based on nanocomposite films. The whole Escherichia. coli cells were fixed onto a surface of indium-tin-oxide glass with and without NBs and/or polyelectrolyte multilayers. In addition, the electrochemical impedance spectroscopy technique, mercury was used to detect.

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Section: The Utilization Of Escherichia Coli-based Magnetic Nanobeads Asmentioning

confidence: 56%

The Utilization of Escherichia Coli-based Magnetic Nanobeads as An Ultrasensitive Biosensor for Mercucy

Sun¹

2011

IJEM

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“…In analyzing impedances, R, and X, for a 1-cm interelectrode distance were subtracted from those for a 2-cm interelectrode distance to give tissue impedance (Zhang and Willison, 1991). In the model shown in Figure 1, the admittance Y is:…”

Section: Calculationsmentioning

confidence: 99%

“…To determine the value of each component in the model, a Marquardt algorithm based on the complex nonlinear least squares was used to search for the minimum S in Equation 9 for 18 experimental frequency points in the manner described by Zhang and Willison (1991).…”

Section: (6)mentioning

confidence: 99%

“…Severa1 electrical models to explain this arc have been proposed. The double-shell model shown in Figure 1 may be the most suitable for plant tissues (Zhang et al, 1990;Zhang and Willison, 1991). In this model, C, and C, represent the capacitance for plasma membrane and the other membranes "including tonoplast," respectively.…”

mentioning

confidence: 99%

“…R,, R,, and R, are extracellular space, cytoplasm, and organelle interior resistances, respectively. Until recently, it has been impossible to determine the value of each parameter with electrical theory, but Zhang and Willison (1991) overcame this problem by using numerical analysis.…”

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confidence: 99%

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Electrical Impedance Analysis of Tissue Properties Associated with Ethylene Induction by Electric Currents in Cucumber (Cucumis sativus L.) Fruit

et al. 1995

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A study based on electrical impedance analysis of tissue properties was conducted in order to understand the relationship between impedance components and ethylene biosynthesis induced by direct current in cucumber (Cucumis safivus 1.) fruit. lmpedances were measured at a range of alternating current frequencies from 500 Hz to 1 MHz. We calculated capacitances representing the plasma membranes, C,, and organelle membranes, C , , and resistances representing extracellular space, R, , cytoplasm, R , , and organelle interior, R3. Direct current of 1 to 3 mA induced ethylene synthesis with a sharp peak at 1 h. l h e rate of production was greater with a stronger current. l h i s abrupt induction of ethylene synthesis was accompanied by an equally abrupt activation of 1 -aminocyclopropane-1-carboxylic acid (ACC) synthase within 1 h, but not that of ACC oxidase, which was activated only at the later stages of the treatment at a time when ethylene production and ACC synthase activity were declining. Using direct current of O to 3 mA, C , , R,, and R2 increased abruptly, and C, increased gradually after 3 h. l h e rates of increases were greater with currents of larger magnitude. R3was not affected during passage of the current. Diazocyclopentadiene, an inhibitor of ethylene action, eliminated the direct current induction of R, but had no effect on the increases in C, and R , . Diazocyclopentadiene counteracted the stimulative effects of exogenously applied ethylene with respect to respiration and activities of ACC oxidase and phenylalanine ammonia-lyase. lhese results indicate that an externally applied current may generate signal(s) by altering the functions of organelle membranes and/or cytoplasmic pH to induce ACC synthase.

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