Objective: To evaluate and compare in vitro antioxidant activity of methanol extract of the indigenous Withania somnifera with the imported root extract. Methods: ABTS •+ radical cation de-colorization assay, DPPH • radical scavenging activity, nitric oxide radical scavenging activity, Fe 2+ chelating activity assay, superoxide anion and hydrogen peroxide radical scavenging activity and ferrous reducing power were studied. Results: The indigenous root extracts was observed comparatively better antioxidant activity than the imported root extract. Conclusion: Indigenous root extract showed high antioxidant potential compared to the imported root extract. Present study of antioxidant activities of Withania somnifera root is the first ever report in Bangladesh.
-Localization of lightning strike point (LSP) in the forest is modeled to mitigate the forest fire damage. Though forest fire ignited by lightning rarely happens, its damage on the forest is grievousness. Therefore, predicting accurate location of LSP becomes crucial in order to control the forest fire. In this paper, we proposed a new hybrid localization algorithm by combining the received signal strength (RSS) and the received signal strength ratio (RSSR) to improve the accuracy by mitigating the environmental effect of lightning strike location in the forest. The proposed hybrid algorithm employs antenna theory (AT) model of cloud-to-ground (CG) return stroke lightning channel to forecast the location of the lightning strike. The obtained results show that the proposed hybrid algorithm achieves better location accuracy compared to the existing RSS method for predicting the lightning strike location considering additive white Gaussian noise (AWGN) environment.
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