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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Capsaicin as an organophosphate synergist against colorado potato beetle (Leptinotarsa decemlineata Say)

100%
Maliszewska J., Tegowska E.
Journal of Plant Protection Research
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2012
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tom 52
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nr 1
The aim of the presented study was to assess the applicability of capsaicin as a synergist for organophosphate insecticide against the Colorado potato beetle (Leptinotarsa decemlineata Say). We recorded the death rate, behavioral thermoregulation and metabolic rate of the examined insects after intoxication with capsaicin and organophosphate pesticide. The results obtained showed that the tested substances changed the thermal preferences of the potato beetle, causing the beetles to prefer a decrease in temperature in the thermal gradient system. We also observed an increase in the metabolic rate of the beetles intoxicated with capsaicin and organophosphate insecticide. The addition of capsaicin in a concentration of 10-7 M (dissolved in alcohol) to insecticide resulted in an increase in the death rate of the insects by 24% in 35°C and 73% in 15°C, in comparison to organophosphate alone. Our results show that capsaicin in low concentrations may be an efficient synergist for organophosphate insecticides against the Colorado potato beetle.
2

Toxicity of insecticide carrier solvent: effect of xylene on hemolymph biochemical parameters in Blaberus giganteus L.

100%
Maliszewska J., Tegowska E.
Polish Journal of Environmental Studies
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2018
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tom 27
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nr 5
Pesticide formulations contain solvents and compounds that improve dispersion and absorption. One of the solvents employed in pesticide concentrates is xylene, an aromatic hydrocarbon widely used in paints, lacquers, or glues. This study was undertaken to evaluate the possible toxic effect of xylene on the giant cave cockroach Blaberus giganteus L. and its role in insecticide formulation toxicity. Different biochemical parameters were determined in cockroaches treated with xylene or pyrethroid formulation, in which xylene is used as a solvent. Xylene induced changes in sugar content and the level of lipid peroxidation similar to changes elicited by treatment with insecticide formulation. The present study shows that xylene induces organismal toxicity in Blaberus giganteus and should not be regarded as a carrier solvent with little biological activity. Since pesticides are always used with adjuvants that can change their toxicity, pesticide formulations should be studied as mixtures for toxic effect.
3
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Hemolymph ph as a marker of pesticide exposition

81%
Maliszewska J., Wyszkowska J., Tegowska E.
Folia Pomeranae Universitatis Technologiae Stetinensis. Agricultura, Alimentaria, Piscaria et Zootechnica
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2017
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tom 44
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nr 4(338)
4

Does an extremely low frequency electromagnetic field (50 Hz) have a permanent effect on the stress-related behaviour in rats?

61%
Klimek A., Siejka A., Kletkiewicz H., Maliszewska J., Wyszkowska J., Stankiewicz M., Rogalska J.
Acta Neurobiologiae Experimentalis
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2019
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tom 79
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nr Suppl.1
INTRODUCTION: An electromagnetic field is a factor that people are exposed to constantly, from various sources. Thus, the interest in its influence on living organisms increases. AIM(S): The aim of this work was to investigate the long‑term effects of an extremely low frequency electromagnetic field 50 Hz (ELF-EMF) on stress-related behaviour. METHOD(S): Adult male Wistar rats were exposed to ELF‑EMF of two values of magnetic induction: 1mT and 7mT. Animals were exposed to ELF‑EMF 1 or 8 hours a day for 7 days. Behavioral changes were evaluated in the open field test, which was performed in 1mT groups immediately or 5 weeks after the exposure, and in 7mT groups immediately, 5 weeks, and additionally 9 and 13 weeks after the exposure to ELF‑EMF. Control rats were subjected to the same experimental procedure as the respective animals exposed to ELF‑EMF except electromagnetic field exposure. We also included in the procedure the non‑treated and then exposed to the open field rats (sham). RESULTS: The behaviour of the animals exposed to 1mT did not differ significantly in comparison to control groups, regardless of the time of exposure. In 7mT groups, we found changes in stress behaviour and their intensity increased with increasing exposure time. In addition, the ELF-EMF-induced effect persisted longer in the case of the group exposed for 8 hours compared to animals exposed for 1 hour. CONCLUSIONS: On this basis, we concluded that ELF-EMF of 7mT may act as a stress factor, and its long‑lasting effects depend on the time of exposure. Furthermore, the absence of significant differences in the case of 1mT ELF‑EMF may indicate the existence of certain compensatory mechanisms in the organism, which allows them to avoid a negative influence of the weak electromagnetic filed. FINANCIAL SUPPORT: Research supported by grant from National Science Centre, Poland, no. 2017/25/B/ NZ7/00638 and project no. POWR.03.05.00‑00‑Z302/17 Universitas Copernicana Thoruniensis In Futuro, a part of the programme Knowledge Education Development.
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The effect of low frequency electromagnetic field (50 Hz) on noradrenaline levels in the hypothalamus in rats

51%
Siejka A., Klimek A., Kletkiewicz H., Maliszewska J., Wyszkowska J., Stankiewicz M., Wieczorek M., Rogalska J.
Acta Neurobiologiae Experimentalis
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2019
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tom 79
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nr Suppl.1
INTRODUCTION: Over the last few decades, electromagnetic pollution from generated electromagnetic fields increases. Particularly important from the point of view of our health is the exposure to extremely low frequency electromagnetic fields (ELF‑EMF). ELF‑EMF is derived from many man-made sources, including power transmission lines or transformers. The effects induced by ELF-EMF exposure on biological systems are still unclear. AIM(S): Therefore, the aim of this study was to determine the long‑term consequences of 50 Hz ELF‑EMF of 1mT and 7mT on the noradrenaline level stress parameter in the rat brain. METHOD(S): 3-month-old male Wistar rats were divided into groups: 1) sham animals (directly taken from home cage; non‑treated), or 2) animals exposed to ELF‑MF (50 Hz, induction 1 mT or 7 mT). Animals were exposed to low (1 mT) or high density (7 mT) ELF‑EMF for one week, for 8h/day. Control animals were subjected to the same experimental procedure as the respective animals exposed to ELF-EMF except magnetic field exposure. The level of noradrenaline in the hypothalamus was measured using HPLC immediately and 5 weeks after the exposure in the group exposed to 1mT and in the group subjected to 7mT, additionally 9 and 13 weeks after the exposure. RESULTS: The results have shown that ELF-MF of both inductions (50 Hz) increased the level of noradrenaline in rats immediately after the exposure and the change in this hormone level was clear even 3 months later, but only in rats exposed to 7mT. CONCLUSIONS: In conclusion, our data indicated that ELF-MF changes noradrenaline levels in the rat brain. Changes found in the present study suggest that extremely low frequency electromagnetic fields could be considered as a stress factor and can be a cause of the development of stress‑related disorders. FINANCIAL SUPPORT: Research supported by project no. 2017/25/B/NZ7/00638 National Science Centre, Poland.
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