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Teuma Mbezi, M.
- Study of the Passive Electrical Properties of Tomato Tissues after Infection and Treatment by Fongicide
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Authors
Affiliations
1 Department of Physics, University of Yaounde I, P.O. Box 812, Yaounde, CM
2 Department of Biology and Vegetal Physiology, University of Yaounde I, P.O. Box 812, Yaounde, CM
1 Department of Physics, University of Yaounde I, P.O. Box 812, Yaounde, CM
2 Department of Biology and Vegetal Physiology, University of Yaounde I, P.O. Box 812, Yaounde, CM
Source
Indian Journal of Science and Technology, Vol 10, No 27 (2017), Pagination:Abstract
Objective: To propose a method of electric detection of a biotic stress before the visible apparition of the symptoms on the plant leaflets. Methods/ Statistical Analysis: By using Cole’s model of cell, we study the behavior of extra-cellular space resistance according to time of four groups of tomato leaflets and make comparison of those different behaviors. Findings: It appears from our analysis that the maxima of resistances leaflets which are infected by mildew and not treated increases gradually and tends to infinity. The infected plants (sick) and treated with the ridomil MC have a relatively low electric resistance level compared to that obtained in the infected and untreated plants. Whether the plants are infected, infected and treated, or healthy and treated; the maxima of resistances were higher than those in pilot plants (untreated and uninfected). The data shows that the disease destroys continuously the physiological state of the plant until death, which corresponds to the higher values of the extra-cellular space resistance peak; the fighting of fungicide against the disease within the plant organism has an impact on the physiological state of the plant which is revealed by the decrease of the extra-cellular space resistance peak. Application/ Improvements: The objective being to contribute in obtaining a bank of numerical resistance values allowing improving the symptomatic methods of detection of the sick plants by the seeing and by the chemical analyses.Keywords
Electrical Resistance, Fungicide, Mildew, Physiological State, Ridomil M.C. Cole’s Model of Cell, Tomato- Behavior of Electrical Properties of Synthetic Chlorophyll Pigment Solution by using the T.E-Model
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Authors
Affiliations
1 Laboratory of Biophysics, Department of Physics, Faculty of Sciences, University of YaoundeI, P. O. Box 812, Yaounde, CM
2 Laboratoryof Mechanics, Department of Physics, Faculty of Sciences, University of Yaoundel, P. O. Box 812, Yaounde, CM
1 Laboratory of Biophysics, Department of Physics, Faculty of Sciences, University of YaoundeI, P. O. Box 812, Yaounde, CM
2 Laboratoryof Mechanics, Department of Physics, Faculty of Sciences, University of Yaoundel, P. O. Box 812, Yaounde, CM
Source
Indian Journal of Science and Technology, Vol 10, No 38 (2017), Pagination:Abstract
Objective: Our purpose is to propose a new method for studying the electrical activity of chlorophyll pigment solution. Methods/Statistical Analysis: The technic and method employed consisted of modeling the chlorophyll as an electrical circuit, which made up of two parallel branches; where R represents the extra chlorophyll space resistance, R’ the intra chlorophyll space resistance and C the chlorophyll capacitance. Then at low frequency, measure R according to the variation of light intensity. Chlorophyll fluorescence is generally used to study chlorophyll pigment solution; but it does not directly show us the electrical activity that occurs as the proposed method. Findings: Our study has shown that electric behavior of synthetic solution of pigment depends of the solution concentration. There is a consensus between the behavior of synthetic chlorophyll and the existing behavior of natural pigments for some concentrations; for example, for 5.1 g/L and 10.2 g/L the extra-chlorophyll resistance of the synthetic pigments, just like that of the natural pigments, decreases according to the intensity of light until it reaches a certain threshold. On the other hand, for concentrations of 4.25 g/L and 2.55 g/L we observe a different electric behavior. Moreover, it is noted that for concentrations reproducing the same electric behavior as for the natural pigments, the decrease of extra chlorophyll resistance is all the more marked that the concentration is high. These results are helpful because we can directly have the electrical behavior of chlorophyll than fluorescence, where we need first to determine parameters like: primary fluorescence (F0), maximal fluorescence (Fm), variable fluorescence (Fv), the photochemical quantic yield (ΦPSII ) of the photosystem II and the assimilation quantic yield of CO2 (ΦCO2) before having an information about the electrical behavior of chlorophyll. Application/Improvements: This method of study can be applied in phototherapy about drugs made from chlorophyll to avoid side effects of chlorophyll solution.- Stochastic Electrical Behavior of Splina Liquid Chlorophyll Drink
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Authors
Affiliations
1 Laboratory of Biophysics, Department of Physics, Faculty of Sciences, University of YaoundeI, Yaounde, CM
2 Laboratory of Phytopathology, Department of Biology and Vegetal Physiology, Faculty of Sciences, University of Yaounde I, Yaounde, CM
3 Laboratory of Mechanics, Department of Physics, Faculty of Sciences, University of Yaounde I, Yaounde, CM
1 Laboratory of Biophysics, Department of Physics, Faculty of Sciences, University of YaoundeI, Yaounde, CM
2 Laboratory of Phytopathology, Department of Biology and Vegetal Physiology, Faculty of Sciences, University of Yaounde I, Yaounde, CM
3 Laboratory of Mechanics, Department of Physics, Faculty of Sciences, University of Yaounde I, Yaounde, CM