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4. Analysis of physical resistance of black grape (vitis vinivera) exposed to extremely low frequency (ELF) magnetic field with intensity of 300µT and 500µT.

Author

Sudarti, Niati, Enik Wasiah, and Laili, Sherly Nur

Subjects
MAGNETIC flux density, CURRENT transformers (Instrument transformer), MAGNETIC fields, PATHOGENIC bacteria
Abstract

Exposure to ELF magnetic field intensity more than 700 µT was proven to be able to suppress the proliferation of pathogenic bacteria, and was able to increase the resistance of tomatoes and grapes. However, it is not yet known the lowest threshold intensity of the ELF magnetic field that can increase the resistance of grapes.This study aimed to analyze the black grapes' (Vitis Vinivera) resistance exposed to a magnetic field of Extremely Low Frequency (ELF) with intensity of 300 µT and 500 µT. The research design used a completely randomized design with a sample of 5 kg of black grapes that had been stored for 10 days from harvest. Extremely Low Frequency (ELF) magnetic field exposure is generated by the Current Transformer. Samples were divided into 5 groups of 1 kg each. Control group (K), two groups exposed to an ELF magnetic field intensity of 300 µT for 60 minutes (E300.60) and for 120 minutes (E300.120), two the group exposed to an ELF magnetic field of intensity 500 µT for 60 minutes (E500.60) and for 120 minutes (E500.120).The variables studied included the physical resistance of grapes with indicators of the number of grapes that had spots, density, and pH value of the grapes. The data was analyzed by using analysis of Mann Whitney and Kruskal Wallis, data on physical conditions were analyzed descriptively. The results showed that the number of grapes that had spots in the sample group exposed to the ELF magnetic field with an intensity of 300 µT and 500 µT was higher than the control group. However, the number of grapes that had spots in the group exposed to the 500 µT ELF magnetic field was still lower than the group exposed to the 300 µT ELF magnetic field. Conclusion: exposure to the ELF magnetic field with intensity of 300 µT - 500 µT for 60 minutes and 120 minutes was still not able to increase the resistance of grapes [ABSTRACT FROM AUTHOR]

Published
2023
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6. Physical Quality of Cow's Milk by Exposure to Magnetic Fields Extremely Low Frequency (ELF) 300 µT and 500 µT by inhibiting Salmonella and Escherichia Coli Growth.

Author

Sudarti, Permatasari, Elok, Ratnasari, Indri, and Laili, Sherly Nur

Subjects
MILK quality, SALMONELLA, ESCHERICHIA coli, ELF electromagnetic fields, PATHOGENIC bacteria
Abstract

Extremely Low Frequency (ELF) magnetic field, high intensity (more than 100 µT), can suppress the growth of pathogenic bacteria, but the impact of low intensity (= 500 µT) needs to be proven. This study aimed to analyze the physical resistance of cow's milk exposed to a magnetic field of 300 µT and 500 µT ELF by inhibiting the proliferation of Salmonella and Escherichia Coli bacteria. Completely Randomized Design (CRD) research design. Samples were 210 bottles of cow's milk (@ 50 ml) divided into seven groups. Exposure to the ELF magnetic field intensity of 300 µT and 500 µT with exposure variations of 60, 90, and 120 minutes. Result: Exposure to an ELF magnetic field with an intensity of 500 µT for 60 minutes significantly (p < 0.05) reduced the Salmonella sp. population but not Escherichia coli. Even though the physical condition showed the color and smell of fresh milk, lumps did not appear until the 10th hour. Conclusion: exposure to the ELF magnetic field intensity of 300 µT and 500 µT has not been able to maintain the quality of cow's milk. [ABSTRACT FROM AUTHOR]

Published
2022
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