Reproducibility and desensitization of the power frequency magnetic field effect on movement of the common cutworm <i>Spodoptera litura</i>

Ryu, Jeong-Min; Kim, Nam‐Jung; Won, Ran; Lee, Sang-Dae; Chae, Kwon‐Seok

doi:10.1111/j.1748-5967.2009.00248.x

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…A rectangular Helmholtz coil system (Fig. 1a ) consisting of three pairs of parallel coils arranged orthogonally for three axes was constructed based on our previous Helmholtz coil system [ 34 – 36 ], and it was used to modulate the intensity of three GMF vectors by active cancellation. The coil for X axis (North–south) was aligned with true geographic north so that Y-coil has a room for contributing to modulate Y vector of GMF.…”

Section: Methodsmentioning

confidence: 99%

Positive geotactic behaviors induced by geomagnetic field in Drosophila

et al. 2016

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BackgroundAppropriate vertical movement is critical for the survival of flying animals. Although negative geotaxis (moving away from Earth) driven by gravity has been extensively studied, much less is understood concerning a static regulatory mechanism for inducing positive geotaxis (moving toward Earth).ResultsUsing Drosophila melanogaster as a model organism, we showed that geomagnetic field (GMF) induces positive geotaxis and antagonizes negative gravitaxis. Remarkably, GMF acts as a sensory cue for an appetite-driven associative learning behavior through the GMF-induced positive geotaxis. This GMF-induced positive geotaxis requires the three geotaxis genes, such as cry, pyx and pdf, and the corresponding neurons residing in Johnston’s organ of the fly’s antennae.ConclusionsThese findings provide a novel concept with the neurogenetic basis on the regulation of vertical movement by GMF in the flying animals.Electronic supplementary materialThe online version of this article (doi:10.1186/s13041-016-0235-1) contains supplementary material, which is available to authorized users.

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Section: Methodsmentioning

confidence: 99%

Positive geotactic behaviors induced by geomagnetic field in Drosophila

et al. 2016

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“…A rectangular Helmholtz coil system modified from our previous studies (Bae et al ; Ryu et al ), consisting of three pairs of parallel coils arranged orthogonally for three axes, was used to generate static magnetic field (MF) for experimental conditions as described in our previous study (Bae et al ). Briefly, the average dimensions of the coils were 1,890 × 1,890 mm, 1,800 × 1,800 mm, and 1,980 × 1,980 mm, for the X, Y, and Z axes respectively.…”

Section: Methodsmentioning

confidence: 99%

A geomagnetic declination compass for horizontal orientation in fruit flies

Lee

et al. 2017

Entomological Research

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The Earth's geomagnetic field (GMF) is known to act as a sensory cue for magnetoreceptive animals such as birds, sea turtles, and butterflies in long-distance migration, as well as in flies, cockroaches, and cattle in short-distance movement or body alignment. Despite a wealth of information, the way that GMF components are used and the functional modality of the magnetic sense are not clear. A GMF component, declination, has never been proven to be a sensory cue in a defined biological context. Here, we show that declination acts as a compass for horizontal food foraging in fruit flies. In an open-field test, adopting the food conditioning paradigm, food-trained flies significantly orientated toward the food direction under ambient GMF and under eastward-turned magnetic field in the absence of other sensory cues. Moreover, a declination change within the natural range, by alteration only of either the east-west or north-south component of the GMF, produced significant orientation of the trained flies, indicating that they can detect and use the difference in these horizontal GMF components. This study proves that declination difference can be used for horizontal foraging, and suggests that flies have been evolutionarily adapted to incorporate a declination compass into their multimodal sensorimotor system.

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Alterations of Immune Parameters on Trichoplusia ni (Lepidoptera: Noctuidae) Larvae Exposed to Extremely Low-Frequency Electromagnetic Fields

Valadéz-Lira¹,

Medina-Chávez²,

Orozco-Flores³

et al. 2017

Environmental Entomology

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Worldwide mobile telephone and microwave use have resulted in an increasing presence of extremely low-frequency electromagnetic field radiations (ELF-EMFs) in ecosystems. ELF-EMFs have been associated with altered physiological processes that can adversely affect exposed organisms. In this study, Trichoplusia ni Hübner larvae were exposed for 24, 48, or 72 h to ELF-EMFs (60 Hz and 2.0 mT) to assess effects on immune response parameters and fertility. Trichoplusia ni life cycle and fertility were not affected by 24-h exposure. However, the number of apoptotic-like cells and cellular immune response significantly increased (P < 0.01) after 72-h exposure (2- and 1.1-fold, respectively), whereas hemolymph total protein and hemocyte cells were reduced (P < 0.01; 16 and 50%, respectively) after 48-h exposure. Hemocyte cell type analysis resulted in significantly (P < 0.01) higher granulocytes number in the unexposed (2-fold increase) and oenocytoids in the 72-h-exposed larvae (28.6-fold increase). Quantitative retrotranscription (RT-qPCR) showed that after 72-h ELF-EMF exposure, the antimicrobial peptides cecropin, lysozyme, gallerimycin, and pgrp were downregulated by 24,866.0, 2.69-, 119.1-, and 1.45-fold, respectively, whereas attacin and defensin were upregulated by 1.59- and 1.85-fold, respectively. The effect of ELF-EMFs on the T. ni larvae immune response and their potential impact on its physiology and susceptibility to pathogens are discussed. This information may provide new insight of ELF-EMFs on other pest species, as well as for the preservation of ecologically important species.

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Reproducibility and desensitization of the power frequency magnetic field effect on movement of the common cutworm Spodoptera litura

Cited by 4 publications

References 16 publications

Positive geotactic behaviors induced by geomagnetic field in Drosophila

Positive geotactic behaviors induced by geomagnetic field in Drosophila

A geomagnetic declination compass for horizontal orientation in fruit flies

Alterations of Immune Parameters on Trichoplusia ni (Lepidoptera: Noctuidae) Larvae Exposed to Extremely Low-Frequency Electromagnetic Fields

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