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Dewaele J, Barraud A, Hellström S, Paxton RJ, Michez D. A new exposure protocol adapted for wild bees reveals species-specific impacts of the sulfoximine insecticide sulfoxaflor. Ecotoxicology 2024:10.1007/s10646-024-02750-2. [PMID: 38649545 DOI: 10.1007/s10646-024-02750-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/31/2024] [Indexed: 04/25/2024]
Abstract
Wild bees are crucial pollinators of flowering plants and concerns are rising about their decline associated with pesticide use. Interspecific variation in wild bee response to pesticide exposure is expected to be related to variation in their morphology, physiology, and ecology, though there are still important knowledge gaps in its understanding. Pesticide risk assessments have largely focussed on the Western honey bee sensitivity considering it protective enough for wild bees. Recently, guidelines for Bombus terrestris and Osmia bicornis testing have been developed but are not yet implemented at a global scale in pesticide risk assessments. Here, we developed and tested a new simplified method of pesticide exposure on wild bee species collected from the field in Belgium. Enough specimens of nine species survived in a laboratory setting and were exposed to oral and topical acute doses of a sulfoximine insecticide. Our results confirm significant variability among wild bee species. We show that Osmia cornuta is more sensitive to sulfoxaflor than B. terrestris, whereas Bombus hypnorum is less sensitive. We propose hypotheses on the mechanisms explaining interspecific variations in sensitivity to pesticides. Future pesticide risk assessments of wild bees will require further refinement of protocols for their controlled housing and exposure.
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Affiliation(s)
- Justine Dewaele
- Research Institute for Biosciences, Laboratory of Zoology, University of Mons (UMons), Place du Parc 20, 7000, Mons, Belgium.
- Univ. Lille, CNRS, UMR 8198 - Evo-Eco-Paleo, F-59000, Lille, France.
| | - Alexandre Barraud
- Research Institute for Biosciences, Laboratory of Zoology, University of Mons (UMons), Place du Parc 20, 7000, Mons, Belgium
- Pollinis, 10 rue Saint-Marc, 75002, Paris, France
| | - Sara Hellström
- General Zoology, Institute for Biology, Martin Luther University Halle-Wittenberg, Hoher Weg 8, 06120, Halle, Germany
| | - Robert J Paxton
- General Zoology, Institute for Biology, Martin Luther University Halle-Wittenberg, Hoher Weg 8, 06120, Halle, Germany
| | - Denis Michez
- Research Institute for Biosciences, Laboratory of Zoology, University of Mons (UMons), Place du Parc 20, 7000, Mons, Belgium
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Schwarz JM, Knauer AC, Alaux C, Barascou L, Barraud A, Dievart V, Ghazoul J, Michez D, Albrecht M. Diverse pollen nutrition can improve the development of solitary bees but does not mitigate negative pesticide impacts. Sci Total Environ 2024; 912:169494. [PMID: 38142004 DOI: 10.1016/j.scitotenv.2023.169494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 12/15/2023] [Accepted: 12/17/2023] [Indexed: 12/25/2023]
Abstract
Floral resource loss and pesticide exposure are major threats to bees in intensively managed agroecosystems, but interactions among these drivers remain poorly understood. Altered composition and lowered diversity of pollen nutrition may reinforce negative pesticide impacts on bees. Here we investigated the development and survival of the solitary bee Osmia bicornis provisioned with three different pollen types, as well as a mixture of these types representing a higher pollen diversity. We exposed bees of each nutritional treatment to five pesticides at different concentrations in the laboratory. Two field-realistic concentrations of three nicotinic acetylcholine receptor (nAChR) modulating insecticides (thiacloprid, sulfoxaflor and flupyradifurone), as well as of two fungicides (azoxystrobin and tebuconazole) were examined. We further measured the expression of two detoxification genes (CYP9BU1, CYP9BU2) under exposure to thiacloprid across different nutrition treatments as a potential mechanistic pathway driving pesticide-nutrition interactions. We found that more diverse pollen nutrition reduced development time, enhanced pollen efficacy (cocoon weight divided by consumed pollen weight) and pollen consumption, and increased weight of O. bicornis after larval development (cocoon weight). Contrary to fungicides, high field-realistic concentrations of all three insecticides negatively affected O. bicornis by extending development times. Moreover, sulfoxaflor and flupyradifurone also reduced pollen efficacy and cocoon weight, and sulfoxaflor reduced pollen consumption and increased mortality. The expression of detoxification genes differed across pollen nutrition types, but was not enhanced after exposure to thiacloprid. Our findings highlight that lowered diversity of pollen nutrition and high field-realistic exposure to nAChR modulating insecticides negatively affected the development of O. bicornis, but we found no mitigation of negative pesticide impacts through increased pollen diversity. These results have important implications for risk assessment for bee pollinators, indicating that negative effects of nAChR modulating insecticides to developing solitary bees are currently underestimated.
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Affiliation(s)
- Janine M Schwarz
- Agroscope, Agroecology and Environment, Zurich, Switzerland; ETH Zurich, Institute for Terrestrial Ecosystems, Ecosystem Management, Zurich, Switzerland.
| | - Anina C Knauer
- Agroscope, Agroecology and Environment, Zurich, Switzerland
| | - Cedric Alaux
- INRAE, Abeilles et Environnement, Avignon, France
| | | | - Alexandre Barraud
- Research Institute for Biosciences, Laboratory of Zoology, University of Mons, Mons, Belgium
| | | | - Jaboury Ghazoul
- ETH Zurich, Institute for Terrestrial Ecosystems, Ecosystem Management, Zurich, Switzerland
| | - Denis Michez
- Research Institute for Biosciences, Laboratory of Zoology, University of Mons, Mons, Belgium
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Barraud A, Barascou L, Lefebvre V, Sene D, Le Conte Y, Alaux C, Grillenzoni FV, Corvucci F, Serra G, Costa C, Vanderplanck M, Michez D. Variations in Nutritional Requirements Across Bee Species. Front Sustain Food Syst 2022. [DOI: 10.3389/fsufs.2022.824750] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
With 2,000 species currently recorded in Europe, bees are a highly diversified and efficient group of pollinating insects. They obtain their nutrients from nectar and pollen of flowers. However, the chemical composition of these resources, especially of pollen (e.g., protein, lipid, amino acids, fatty acids, or sterol content), is highly variable among plant species. While it is well-known that bees show interspecific variation in their floral choices, there is a lack of information on the nutritional requirements of different bee species. We therefore developed original experiments in laboratory conditions to evaluate the interspecific variations in bee nutritional requirements. We analyzed the chemical content of eight pollen blends, different in terms of protein, lipid, amino acids, and sterols total concentration and profiles. Each pollen blend was provided to four different bee model species: honey bees (Apis mellifera), bumblebees (Bombus terrestris), mason bees (Osmia bicornis and Osmia cornuta). For each species, specific protocols were used to monitor their development (e.g., weight, timing, survival) and resource collection. Overall, we found that the nutritional requirements across those species are different, and that a low-quality diet for one species is not necessarily low-quality for another one. While honey bees are negatively impacted by diets with a high protein content (~40%), bumblebees and mason bees develop normally on these diets but struggle on diets with a low total amino acid and sterol content, specifically with low concentrations of 24-methylenecholesterol and β-sitosterol. Overall, our study supports the need of conserving and/or introducing plant diversity into managed ecosystems to meet the natural nutritional preferences of bees at species and community level.
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Barascou L, Sene D, Barraud A, Michez D, Lefebvre V, Medrzycki P, Di Prisco G, Strobl V, Yañez O, Neumann P, Le Conte Y, Alaux C. Pollen nutrition fosters honeybee tolerance to pesticides. R Soc Open Sci 2021; 8:210818. [PMID: 34540259 PMCID: PMC8437229 DOI: 10.1098/rsos.210818] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 07/10/2021] [Indexed: 05/11/2023]
Abstract
A reduction in floral resource abundance and diversity is generally observed in agro-ecosystems, along with widespread exposure to pesticides. Therefore, a better understanding on how the availability and quality of pollen diets can modulate honeybee sensitivity to pesticides is required. For that purpose, we evaluated the toxicity of acute exposure and chronic exposures to field realistic and higher concentrations of azoxystrobin (fungicide) and sulfoxaflor (insecticide) in honeybees provided with pollen diets of differing qualities (named S and BQ pollens). We found that pollen intake reduced the toxicity of the acute doses of pesticides. Contrary to azoxystrobin, chronic exposures to sulfoxaflor increased by 1.5- to 12-fold bee mortality, which was reduced by pollen intake. Most importantly, the risk of death upon exposure to a high concentration of sulfoxaflor was significantly lower for the S pollen diet when compared with the BQ pollen diet. This reduced pesticide toxicity was associated with a higher gene expression of vitellogenin, a glycoprotein that promotes bee longevity, a faster sulfoxaflor metabolization and a lower concentration of the phytochemical p-coumaric acid, known to upregulate detoxification enzymes. Thus, our study revealed that pollen quality can influence the ability of bees to metabolize pesticides and withstand their detrimental effects, providing another strong argument for the restoration of suitable foraging habitat.
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Affiliation(s)
| | - Deborah Sene
- INRAE, Abeilles et Environnement, Avignon, France
| | - Alexandre Barraud
- Research Institute for Biosciences, Laboratory of Zoology, University of Mons, Place du Parc 20, 7000 Mons, Belgium
| | - Denis Michez
- Research Institute for Biosciences, Laboratory of Zoology, University of Mons, Place du Parc 20, 7000 Mons, Belgium
| | - Victor Lefebvre
- Research Institute for Biosciences, Laboratory of Zoology, University of Mons, Place du Parc 20, 7000 Mons, Belgium
| | - Piotr Medrzycki
- Council for Agricultural Research and Economics—Agriculture and Environment Research Centre, Via di Corticella 133, 40128 Bologna, Italy
| | - Gennaro Di Prisco
- Council for Agricultural Research and Economics—Agriculture and Environment Research Centre, Via di Corticella 133, 40128 Bologna, Italy
- Institute for Sustainable Plant Protection, National Research-Council, Piazzale Enrico Fermi 1, 80055 Portici, Naples, Italy
| | - Verena Strobl
- Institute of Bee Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Orlando Yañez
- Institute of Bee Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Peter Neumann
- Institute of Bee Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | | | - Cedric Alaux
- INRAE, Abeilles et Environnement, Avignon, France
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Barraud A, Vanderplanck M, Nadarajah S, Michez D. The impact of pollen quality on the sensitivity of bumblebees to pesticides. Acta Oecologica 2020. [DOI: 10.1016/j.actao.2020.103552] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Bart S, Barraud A, Amossé J, Péry ARR, Mougin C, Pelosi C. Effects of two common fungicides on the reproduction of Aporrectodea caliginosa in natural soil. Ecotoxicol Environ Saf 2019; 181:518-524. [PMID: 31234066 DOI: 10.1016/j.ecoenv.2019.06.049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 06/10/2019] [Accepted: 06/17/2019] [Indexed: 06/09/2023]
Abstract
The use of pesticides in agroecosystems can have negative effects on earthworms, which play key roles in soil functioning such as organic matter decomposition. The aim of this study was to assess the effects of two fungicides (Cuprafor micro®, composed of copper oxychloride, and Swing Gold®, composed of epoxiconazole (EPX) and dimoxystrobin (DMX)) on earthworm reproduction by exposing adults and cocoons. First, adult Aporrectodea caliginosa individuals were exposed for 28 days to 3.33, 10 and 30 times the recommended dose (RD) of Cuprafor micro® corresponding to 25.8, 77.5 and 232.5 mg kg-1 dry soil of copper, respectively, and 0.33, 1 and 3 times the RD of Swing Gold® (corresponding to 5.2 × 10-2 mg DMX kg-1 + 1.94 × 10-2 mg EPX kg-1, 1.55 × 10-1 mg DMX kg-1 + 5.81 × 10-2 mg EPX kg-1 and 4.62 × 10-1 mg DMX kg-1 + 1.74 × 10-1 mg EPX kg-1 respectively), in addition to a control soil with no fungicide treatment. Cocoon variables (production, weight, hatching success, hatching time) were monitored. Second, "naïve" cocoons produced by uncontaminated earthworms were exposed to soils contaminated by the same concentrations of the two fungicides, and we assessed hatching success and hatching time. In the first experiment, cocoon production was halved at the highest copper concentration (232.5 mg Cu kg-1 of dry soil) as compared to the control. Cocoons took 5 more days to hatch, and the hatching success decreased by 35% as compared to the control. In the Swing Gold® treatments, cocoon production was reduced by 63% at 3 times the RD, and the hatching success significantly decreased by 16% at the RD. In the second experiment, only the hatching success of cocoons was impacted by Swing Gold® at 3 times the RD (30% less hatching). It is concluded that the cocoon stock in the soil is crucial for the renewal of populations in the field. The most sensitive endpoint was the hatching success of the cocoons produced by exposed adults. This endpoint and the effects observed on the "naïve" cocoons could be taken into account in pesticide risk assessment.
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Affiliation(s)
- Sylvain Bart
- UMR ECOSYS, INRA, AgroParisTech, Université Paris-Saclay, 78026, Versailles, France.
| | - Alexandre Barraud
- UMR ECOSYS, INRA, AgroParisTech, Université Paris-Saclay, 78026, Versailles, France
| | - Joël Amossé
- UMR ECOSYS, INRA, AgroParisTech, Université Paris-Saclay, 78026, Versailles, France
| | - Alexandre R R Péry
- UMR ECOSYS, INRA, AgroParisTech, Université Paris-Saclay, 78026, Versailles, France
| | - Christian Mougin
- UMR ECOSYS, INRA, AgroParisTech, Université Paris-Saclay, 78026, Versailles, France
| | - Céline Pelosi
- UMR ECOSYS, INRA, AgroParisTech, Université Paris-Saclay, 78026, Versailles, France
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Vanderplanck M, Martinet B, Carvalheiro LG, Rasmont P, Barraud A, Renaudeau C, Michez D. Ensuring access to high-quality resources reduces the impacts of heat stress on bees. Sci Rep 2019; 9:12596. [PMID: 31467366 PMCID: PMC6715733 DOI: 10.1038/s41598-019-49025-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 08/15/2019] [Indexed: 11/09/2022] Open
Abstract
Pollinators are experiencing declines globally, negatively affecting the reproduction of wild plants and crop production. Well-known drivers of these declines include climatic and nutritional stresses, such as a change of dietary resources due to the degradation of habitat quality. Understanding potential synergies between these two important drivers is needed to improve predictive models of the future effects of climate change on pollinator declines. Here, bumblebee colony bioassays were used to evaluate the interactive effects of heat stress, a reduction of dietary resource quality, and colony size. Using a total of 117 colonies, we applied a fully crossed experiment to test the effect of three dietary quality levels under three levels of heat stress with two colony sizes. Both nutritional and heat stress reduced colony development resulting in a lower investment in offspring production. Small colonies were much more sensitive to heat and nutritional stresses than large ones, possibly because a higher percentage of workers helps maintain social homeostasis. Strikingly, the effects of heat stress were far less pronounced for small colonies fed with suitable diets. Overall, our study suggests that landscape management actions that ensure access to high-quality resources could reduce the impacts of heat stress on bee decline.
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Affiliation(s)
- Maryse Vanderplanck
- Laboratory of Zoology, Research Institute for Biosciences, University of Mons, Place du Parc 23, 7000, Mons, Belgium. .,Evo-Eco-Paleo - UMR 8198, CNRS, Université de Lille, F-59000, Lille, France.
| | - Baptiste Martinet
- Laboratory of Zoology, Research Institute for Biosciences, University of Mons, Place du Parc 23, 7000, Mons, Belgium.
| | - Luísa Gigante Carvalheiro
- Departamento de Ecologia, Universidade Federal de Goiás, Campus Samambaia, Goiânia, GO, Brazil.,Center for Ecology, Evolution and Environmental Changes (cE3c), University of Lisboa, Lisbon, Portugal
| | - Pierre Rasmont
- Laboratory of Zoology, Research Institute for Biosciences, University of Mons, Place du Parc 23, 7000, Mons, Belgium
| | - Alexandre Barraud
- Laboratory of Zoology, Research Institute for Biosciences, University of Mons, Place du Parc 23, 7000, Mons, Belgium.,Pierre and Marie Curie University, Paris-Sorbonne 4, Place Jussieu, 75005, Paris, France
| | - Coraline Renaudeau
- Pierre and Marie Curie University, Paris-Sorbonne 4, Place Jussieu, 75005, Paris, France
| | - Denis Michez
- Laboratory of Zoology, Research Institute for Biosciences, University of Mons, Place du Parc 23, 7000, Mons, Belgium
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Bart S, Pelosi C, Barraud A, Péry ARR, Cheviron N, Grondin V, Mougin C, Crouzet O. Earthworms Mitigate Pesticide Effects on Soil Microbial Activities. Front Microbiol 2019; 10:1535. [PMID: 31333628 PMCID: PMC6616067 DOI: 10.3389/fmicb.2019.01535] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 06/20/2019] [Indexed: 11/13/2022] Open
Abstract
Earthworms act synergistically with microorganisms in soils. They are ecosystem engineers involved in soil organic matter degradation and nutrient cycling, leading to the modulation of resource availability for all soil organisms. Using a soil microcosm approach, we aimed to assess the influence of the earthworm Aporrectodea caliginosa on the response of soil microbial activities against two fungicides, i.e., Cuprafor Micro® (copper oxychloride, a metal) and Swing® Gold (epoxiconazole and dimoxystrobin, synthetic organic compounds). The potential nitrification activity (PNA) and soil enzyme activities (glucosidase, phosphatase, arylamidase, and urease) involved in biogeochemical cycling were measured at the end of the incubation period, together with earthworm biomass. Two common indices of the soil biochemistry were used to aggregate the response of the soil microbial functioning: the geometric mean (Gmean) and the Soil Quality Index (SQI). At the end of the experiment, the earthworm biomass was not impacted by the fungicide treatments. Overall, in the earthworm-free soil microcosms, the two fungicides significantly increased several soil enzyme and nitrification activities, leading to a higher GMean index as compared to the non-treated control soils. The microbial activity responses depended on the type of activity (nitrification was the most sensitive one), on the fungicide (Swing® Gold or Cuprafor Micro®), and on the doses. The SQI indices revealed higher effects of both fungicides on the soil microbial activity in the absence of earthworms. The presence of earthworms enhanced all soil microbial activities in both the control and fungicide-contaminated soils. Moreover, the magnitude of the fungicide impact, integrated through the SQI index, was mitigated by the presence of earthworms, conferring a higher stability of microbial functional diversity. Our results highlight the importance of biotic interactions in the response of indicators of soil functioning (i.e., microbial activity) to pesticides.
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Affiliation(s)
- Sylvain Bart
- UMR ECOSYS, INRA, AgroParisTech, Université Paris-Saclay, Versailles, France
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Leloup J, Maire P, Ruaudel-Teixier A, Barraud A. Relation entre structure et réactivité des sels d'argent dans des films de langmuir-blodgett. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1985820695] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Vandevyver M, Barraud A, Lesieur P, Richard J, Ruaudel-Teixier A. Couches de Langmuir-Blodgett conductrices obtenues à partir d'un sel complexe de TCNQ. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1986830599] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Vandevyver M, Richard J, Barraud A, Veber M, Jallabert C, Strzelecka H. Langmuir-blodgett films of liquid-crystalline heteroaromatic cations associated with diamagnetic (BF4-, CIO4-) or paramagnetic (TCNQ[math]) anions. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1988850385] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Ruaudel-Teixier A, Barraud A, Vandevyver M, Belbeoch B, Roulliay M. Relation entre structure et propriétés électriques d'un complexe à transfert de charge en films de langmuir-blodgett. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1985820711] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Barraud A. Le problème des amygdales. Acta Otolaryngol 2009. [DOI: 10.3109/00016484309124201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Porteu F, Palacin S, Ruaudel-teixier A, Barraud A. Molecular Engineering at the Air-Water Interface: Building up Designed Supermolecular Assemblies with Amphiphilic Porphyrins. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259208025820] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- F. Porteu
- a CEA/Service Chimie Moléculaire , CE Saclay, Bǎt 125, 91191 , GIF SUR YVETTE , Cedex , FRANCE
| | - S. Palacin
- a CEA/Service Chimie Moléculaire , CE Saclay, Bǎt 125, 91191 , GIF SUR YVETTE , Cedex , FRANCE
| | - A. Ruaudel-teixier
- a CEA/Service Chimie Moléculaire , CE Saclay, Bǎt 125, 91191 , GIF SUR YVETTE , Cedex , FRANCE
| | - A. Barraud
- a CEA/Service Chimie Moléculaire , CE Saclay, Bǎt 125, 91191 , GIF SUR YVETTE , Cedex , FRANCE
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Porteu F, Palacin S, Ruaudel-Teixier A, Barraud A. Supermolecular engineering at the air-water interface: spatially controlled formation of heterodimers from amphiphilic porphyrins and porphyrazines through specific molecular recognition. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100172a060] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Yartsev VM, Bourgoin JP, Delhaes P, Vandevyver M, Barraud A. Spectroscopic properties of conducting Langmuir–Blodgett films obtained by the ‘‘homodoping strategy’’. J Chem Phys 1993. [DOI: 10.1063/1.465162] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Barraud A, Perrot H, Billard V, Martelet C, Therasse J. Study of immunoglobulin G thin layers obtained by the Langmuir-Blodgett method: application to immunosensors. Biosens Bioelectron 1993; 8:39-48. [PMID: 8499086 DOI: 10.1016/0956-5663(93)80042-n] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Nowadays, immunosensors play a leading part in the field of bioanalytical chemistry research. As with any biosensor, they need appropriate transducers and a suitable technique to immobilize the active biocomponents. In this study, two transduction modes were chosen: mass effects (quartz microbalance measurements) and geometric and dielectric effects (capacitance measurements). The Langmuir-Blodgett (LB) method appears to be quite suitable for generating biospecific surfaces. This work has focused on the detection of staphylococcal enterotoxin B, the corresponding antibody being immobilized at the surface of fatty acids by a variant of the LB method. The composition of the film and the nature of antibody-fatty acid interactions were studied by means of the two transducers mentioned above. FTIR (Fourier transform infra-red) spectroscopy and protein diagnostic assay. Influence of several parameters (pH, ionic strength, transfer pressure, antibody concentration in the subphase) was investigated. The immobilization rate reached its maximum when experimental conditions allowed optimal electrostatic interactions. In this case, the quartz crystal microbalance response, in air, reached 55 Hz per monolayer of immobilized immunoglobulin G and the equivalent capacitance variation, measured in liquid media, was around 300 pF cm-2. Activity of the biospecific LB films, when binding enterotoxin, was checked by the classical ELISA (enzyme immuno-linked assay) technique.
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Affiliation(s)
- A Barraud
- Centre d'Etudes Nucléaires de Saclay, DRECAM, SCM, Gif-sur-Yvette, France
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22
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Bourgoin JP, Vandevyver M, Barraud A, Tremblay G, Hesto P. Field-Effect Transistor based on conducting Langmuir-Blodgett films of EDTTTF derivatives. ACTA ACUST UNITED AC 1993. [DOI: 10.1007/bf00999819] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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23
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Richard J, Vandevyver M, Barraud A, Morand J, Delhaes P. A new highly conducting Langmuir-Blodgett film based on a radical ion salt of a tetrathiafulvalene derivative. J Colloid Interface Sci 1989. [DOI: 10.1016/0021-9797(89)90437-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Henrion L, Derost G, Ruaudel-Teixier A, Barraud A. Investigation of N-docosyl pyridinium, TCNQ Langmuir-Blodgett films as gas sensors. ACTA ACUST UNITED AC 1988. [DOI: 10.1016/0250-6874(88)80072-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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26
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Barraud A, Flörsheimer M, Möhwald H, Richard J, Ruaudel-Teixier A, Vandevyver M. Morphology and crystalline nature of a Langmuir—Blodgett film of a TCNQ charge transfer salt. J Colloid Interface Sci 1988. [DOI: 10.1016/0021-9797(88)90451-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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27
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Richard J, Vandevyver M, Barraud A, Morand JP, Lapouyade R, Delhaes P, Jacquinot JF, Roulliay M. Preparation of new conducting Langmuir–Blodgett films based on an ethylenedithiodioctadecylthiotetrathiafulvalene charge transfer complex. ACTA ACUST UNITED AC 1988. [DOI: 10.1039/c39880000754] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Vandevyer M, Richard J, Barraud A, Ruaudel‐Teixier A, Lequan M, Lequan RM. A new family of Langmuir–Blodgett films of tetracyanoquinodimethane charge transfer salts: Pristine and iodine doped conducting films. J Chem Phys 1987. [DOI: 10.1063/1.453413] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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29
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Barraud A, Desmaison P, Mas C, Robin MP, Sansonnet I. [Art, writing, lunacy]. Soins Psychiatr 1987; 84:43-8. [PMID: 3445141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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30
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Barraud A, Lequan M, Lequan RM, Lesieur P, Richard J, Ruaudel-Teixier A, Vandevyver M. A novel highly conducting tetracyanoquinodimethane (TCNQ) Langmuir–Blodgett film. ACTA ACUST UNITED AC 1987. [DOI: 10.1039/c39870000797] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Barraud A. Réflexions sur les Epistaxis spontanées. ORL J Otorhinolaryngol Relat Spec 1946. [DOI: 10.1159/000273412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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