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Your search keyword '"Oliveira, Regiane C."' showing total 4 results
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4 results on '"Oliveira, Regiane C."'

3. First report of the association between Wolbachia and Cotesia flavipes (Hymenoptera: Braconidae): effect on life history parameters of the parasitoid.

Author

Silva, Nadja Nara P., Carvalho, Vanessa R., Silva, Carolane B., Bomfim, João Pedro A., Ramos, Gabryele S., and Oliveira, Regiane C.

Subjects
SUGARCANE borer, PARASITIC wasps, HYMENOPTERA, BRACONIDAE, LEPIDOPTERA, WOLBACHIA, PARASITOIDS
Abstract

The symbiosis between microorganisms and host arthropods can cause biological, physiological, and reproductive changes in the host population. The present study aimed to survey facultative symbionts of the genera Wolbachia , Arsenophonus , Cardinium , Rickettsia , and Nosema in Cotesia flavipes (Cameron) (Hymenoptera: Braconidae) and Diatraea saccharalis (Fabricius) (Lepidoptera: Crambidae) in the laboratory and evaluate the influence of infection on the fitness of these hosts. For this purpose, 16S rDNA primers were used to detect these facultative symbionts in the host species, and the hosts' biological and morphological features were evaluated for changes resulting from the infection caused by these microorganisms. The bacterial symbionts studied herein were not detected in the D. saccharalis samples analysed, but the endosymbiont Wolbachia was detected in C. flavipes and altered the biological and morphological aspects of this parasitoid insect. The results of this study may help to elucidate the role of Wolbachia in maintaining the quality of populations/lineages of C. flavipes. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Valorization of Hesperidin from Citrus Residues: Evaluation of Microwave-Assisted Synthesis of Hesperidin-Mg Complex and Their Insecticidal Activity

Author

Silva,Danielle F. da, Bomfim,João P. A., Marchi,Rafael C., Amaral,Jéssica C., Pinto,Luciano S., Carlos,Rose M., Ferreira,Antonio G., Forim,Moacir R., Fernandes,João B., Silva,Maria F. G. F. da, Oliveira,Regiane C. de, Buss,David, Kirk,William D. J., and Bruce,Toby J. A.

Subjects
Citrus, hesperidin, microwave, citrus waste, magnesium
Abstract

The aim of the current study was the valorization of hesperidin, the dominant flavonoid in citrus processing waste, by microwave-assisted synthesis of hesperidin-Mg complex, improving its antioxidant activity and insecticidal potential. Here we show, for the first time, that microwave-assisted synthesis of [Mg(hesp)2(phen)]OAc (1) (hesp: hesperidin, phen: phenanthroline) improve the reaction rate and yield. The nuclear magnetic resonance (NMR) experiments proved to be powerful tools for the identification of three isomers in metal complexes. Moreover, we explore the insecticidal potential of 1 and [Mg(phen)2(Isov)]OAc (2) (Isov : isovanillic acid) complexes against three insects. Complex 1 killed 80% of adults whitefly at 0.14 μmol L-1, and 2 76% at 0.36 μmol L-1. There was a total mortality of Spodoptera frugiperda with 2 at 0.39 μmol L-1, and 83% with 1 at 0.14 μmol L-1. Both have similar activity, and represent a novel group of insecticide for Bemisia tabaci and S. frugiperda; nevertheless, the benefits of both as Myzus persicae repellent require further evaluation.

Published
2022

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