There are a number of different methods for measuring impedance. Some common ones include the Nyquist plot and the Bode plot. The Bode plot is more widely used in engineering, and comprises two separate logarithmic plots that show the magnitude vs. frequency of a signal.
In situ measurement
Impedance spectroscopy (IS) is a technique used for measurement of impedance in a sample. The process involves exposing the sample to a high-pressure stream of hydrogen and measuring changes in the specimen’s impedance. The results can be used to analyze the chemical composition of a sample.
The research is generally divided into two categories, namely ex situ and in situ. This article will examine the benefits and challenges of EIS in situ measurement in plant roots.
Modified Hayden model
In impedance spectroscopy, the data derived from electrochemical impedance spectra are typically interpreted using an equivalent circuit. This circuit is usually made of a series of capacitors and resistors. However, it can include more complex elements as well. The data fitting process is normally computer-assisted and specific software packages are used to extract circuit parameters.
Electrical impedance spectroscopy has been used to explore the physiological state of potato tissues during hot air drying. The results show changes in cell structure and intracellular fluid. The model used to analyze the data was the modified Hayden model, which is an equivalent circuit model for cellular tissues. The model examines changes in the parameters that are equivalent to the values in the cellular tissue.
Bode plot
In electrochemical impedance spectroscopy (EIS), the Bode plot is one of the most popular plots. It plots the total impedance and phase shift of the cell over a frequency range. It is useful for studying the harmonic response of electrochemical systems. The method works by applying small sinusoidal variations to a working electrode. The resulting current is then analyzed in the frequency domain. The real and imaginary components of the resulting current give information about the kinetic and mass transport properties of the cell. The Bode plot also shows the surface properties of an electrode.
The Bode plot in Impedance spectrometry is a simple yet powerful tool for studying electrochemical Impedance spectra. It involves fitting the spectrum using simulation software that takes into account the frequency logarithm, phase shift, and other parameters.
Application in plant research
Electrical impedance measurements can provide valuable information about plant tissues. This measurement is extremely sensitive to changes in plant tissues and can help scientists to detect alterations in the growth of plants. Impedance measurements can be used to monitor the growth of plants in a variety of scientific disciplines.
The sensitivity of EIS signals to changes in plant tissues is confirmed by indirect correlations with root traits. These findings provide a foundation for future studies and describe the practical use of IIS. However, more studies are needed on different root types, especially woody roots, which exhibit deeper current penetration pathways. In addition, further physiological characterization of plant tissues may be necessary for the development of more sensitive methods.
