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17 results on '"BENOIT, J. B."'

9. Rediscovery and reclassification of the dipteran taxon Nothomicrodon Wheeler, an exclusive endoparasitoid of gyne ant larvae

Author

University of Helsinki, Finnish Museum of Natural History, Perez-Lachaud, Gabriela, Jahyny, Benoit J. B., Stahls, Gunilla, Rotheray, Graham, Delabie, Jacques H. C., Lachaud, Jean-Paul, University of Helsinki, Finnish Museum of Natural History, Perez-Lachaud, Gabriela, Jahyny, Benoit J. B., Stahls, Gunilla, Rotheray, Graham, Delabie, Jacques H. C., and Lachaud, Jean-Paul

Abstract

The myrmecophile larva of the dipteran taxon Nothomicrodon Wheeler is rediscovered, almost a century after its original description and unique report. The systematic position of this dipteran has remained enigmatic due to the absence of reared imagos to confirm indentity. We also failed to rear imagos, but we scrutinized entire nests of the Brazilian arboreal dolichoderine ant Azteca chartifex which, combined with morphological and molecular studies, enabled us to establish beyond doubt that Nothomicrodon belongs to the Phoridae (Insecta: Diptera), not the Syrphidae where it was first placed, and that the species we studied is an endoparasitoid of the larvae of A. chartifex, exclusively attacking sexual female (gyne) larvae. Northomicrodon parasitism can exert high fitness costs to a host colony. Our discovery adds one more case to the growing number of phorid taxa known to parasitize ant larvae and suggests that many others remain to be discovered. Our findings and literature review confirm that the Phoridae is the only taxon known that parasitizes both adults and the immature stages of different castes of ants, thus threatening ants on all fronts.

Published
2017

16. Nouvelle Carte de partie des Côtes de Terre Ferme et Isles situees sur L'Ocean [Material cartográfico] : Comprises entre le Tropique du Cancer et le Parallele de 52 Degrez 35 Minutes

Author

Berthelot, François (Hidrógrafo), Benoit, J. B., Berthelot, François (Hidrógrafo), and Benoit, J. B.

Abstract

Inserta en el ángulo superior derecho una nota con información sobre las observaciones, medidas, etc. que se han tenido en cuenta para la realización de la carta, Inserta en el ángulo superior derecho una nota con información sobre las observaciones, medidas, etc. que se han tenido en cuenta para la realización de la carta, Escala expresada en otras unidades, Escala expresada en otras unidades, Orientado con rosas de 16 vientos con lis con el N. al O. de la hoja. - Nudos de rumbos. - Graduada la latitud. - Sondas batimétricas, veriles y bajos. - Toponimia localizada unicamente en la costa. - Costas sombreadas, Lugar de publicación deducido del lugar de actividad tanto del autor del mapa como de la casa editorial, Fecha de publicación tomada del periodo de actividad de F. Berthelot, profesor de Hidrografía de la villa de Marsella, y autor del mapa. La Biblioteca Nacional conserva dos obras de este autor "Abrege de la navegation..." y "Traité de la Navigation" impresas en Marsella en 1691 y 1719, En el ángulo inferior izquierdo se encuentra el título en cartela en cornucopia decorada con motivos vegetales. Junto a ella las escalas dentro de un recuadro sin decorar

17. Deployment and transcriptional evaluation of nitisinone, an FDA-approved drug, to control bed bugs.

Author

Sterkel M, Tompkin J, Schal C, Guerra LM, Pessoa GCD, Oliveira PL, and Benoit JB

Abstract

Bed bugs are blood-feeders that rapidly proliferate into large indoor infestations. Their bites can cause allergies, secondary infections and psychological stress, among other problems. Although several tactics for their management have been used, bed bugs continue to spread worldwide wherever humans reside. This is mainly due to human-mediated transport and their high resistance to several classes of insecticides. New treatment options with novel modes of action are required for their control. In this study, we evaluated the use of nitisinone (NTBC), an FDA-approved drug, for bed bug control in an insecticide-susceptible (HH) and an insecticide-resistant (CIN) population. Although NTBC was lethal to both populations when administered orally or applied topically in very low doses, we observed a slight but significant resistance in the CIN population. Transcriptomic analysis in both populations indicated that NTBC treatment elicited a broad suppression of genes associated with RNA post-transcriptional modifications, translation, endomembrane system, protein post-translational modifications and protein folding. The CIN population exhibited higher ATP production and xenobiotic detoxification. Feeding studies on a mouse model highlight that NTBC could be used as a control method of bed bugs by host treatment. The results demonstrate that NTBC can be used as a new active ingredient for bed bug control by topical or oral treatment and shed light on the molecular mechanisms of suppressed tyrosine metabolism following NTBC treatment.

Published
2024
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