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Pompermayer E, Ysebaert MP, Vinardell T, Oikawa MA, Johnson JP, Fernandes T, David F. One-stage surgical case management of a two-year-old Arabian horse affected by male-pseudo hermaphroditism. J Equine Vet Sci 2024; 133:105007. [PMID: 38237706 DOI: 10.1016/j.jevs.2024.105007] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 01/15/2024] [Accepted: 01/15/2024] [Indexed: 01/23/2024]
Abstract
A two-year-old Arabian horse presented for abnormal external genitalia and dangerous stallion-like behavior was diagnosed with disorder of sexual development (DSD), also known as intersex/hermaphroditism. Standing 1-stage surgical procedure performed under sedation, and local anesthesia to concurrently eliminate stallion-like behavior, risk of neoplastic transformation of intraabdominal gonads, and to replace ambiguous external genital with a functional, and cosmetically more acceptable anatomy. Step-1) Laparoscopic abdominal exploration and gonadectomy; Step-2) Rudimentary penis resection and perineal urethrostomy. The horse tolerated surgery well (combined surgery time 185 min) with no complications. At macroscopic examination of the gonads, they resembled hypoplastic testis-like tissues. Microscopic examination confirmed presence of seminiferous tubules, Leydig and Sertoli/granulosa cells. Cytogenetic evaluation revealed a 64,XX karyotype, SRY-negative. The stallion-like behavior subsided within days post-operatively. Long-term follow-up revealed the genitoplasty site healed without urine scalding or urethral stricture. The owner satisfaction was excellent and the horse could be used post-surgery as an athlete.
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Affiliation(s)
- E Pompermayer
- Equine Veterinary Medical Center - Member of Qatar Foundation, Al Shaqab Street, Al Rayyan, Doha, Qatar
| | - M P Ysebaert
- Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, 1601 Campus Delivery, Fort Collins, CO 80523-1601, USA
| | - T Vinardell
- Equine Care Group, Paalstraat 8, 3560 Lummen, Belgium
| | - M-A Oikawa
- Equine Veterinary Medical Center - Member of Qatar Foundation, Al Shaqab Street, Al Rayyan, Doha, Qatar
| | - J P Johnson
- Equine & Camel Hospital, Abu Dhabi, United Arab Emirates
| | - T Fernandes
- Equine Veterinary Medical Center - Member of Qatar Foundation, Al Shaqab Street, Al Rayyan, Doha, Qatar
| | - F David
- EquiTom - Namur, member of the Equine Care Group, 15 Chaussée de Nivelles, 5032 Mazy, Belgium.
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2
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Abstract
Hyperpolarization-activation cyclic nucleotide-gated (HCN) channels were for the first time implicated in absence seizures (ASs) when an abnormal Ih (the current generated by these channels) was reported in neocortical layer 5 neurons of a mouse model. Genetic studies of large cohorts of children with Childhood Absence Epilepsy (where ASs are the only clinical symptom) have identified only 3 variants in HCN1 (one of the genes that code for the 4 HCN channel isoforms, HCN1-4), with one (R590Q) mutation leading to loss-of-function. Due to the multi-faceted effects that HCN channels exert on cellular excitability and neuronal network dynamics as well as their modulation by environmental factors, it has been difficult to identify the detailed mechanism by which different HCN isoforms modulate ASs. In this review, we systematically and critically analyze evidence from established AS models and normal non-epileptic animals with area- and time-selective ablation of HCN1, HCN2 and HCN4. Notably, whereas knockout of rat HCN1 and mouse HCN2 leads to the expression of ASs, the pharmacological block of all HCN channel isoforms abolishes genetically determined ASs. These seemingly contradictory results could be reconciled by taking into account the well-known opposite effects of Ih on cellular excitability and network function. Whereas existing evidence from mouse and rat AS models indicates that pan-HCN blockers may provide a novel approach for the treatment of human ASs, the development of HCN isoform-selective drugs would greatly contribute to current research on the role for these channels in ASs generation and maintenance as well as offer new potential clinical applications.
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Affiliation(s)
- Vincenzo Crunelli
- Neuroscience Division, School of Bioscience, Cardiff University, Cardiff, UK.
| | - Francois David
- Integrative Neuroscience and Cognition Center, Paris University, Paris, France
| | - Tatiana P Morais
- Department of Physiology and Biochemistry, Faculty of Medicine and Surgery, Malta University, Msida, Malta
| | - Magor L Lorincz
- Neuroscience Division, School of Bioscience, Cardiff University, Cardiff, UK; Department of Physiology, Szeged University, Szeged, Hungary.
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3
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Ayub S, David F, Klein E, Borel M, Paul O, Gentet LJ, Ruther P. Compact Optical Neural Probes With Up to 20 Integrated Thin-Film $\mu$LEDs Applied in Acute Optogenetic Studies. IEEE Trans Biomed Eng 2020; 67:2603-2615. [DOI: 10.1109/tbme.2020.2966293] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Carcelain G, David F, Lepage S, Bonnefont-Rousselot D, Delattre J, Legrand A, Peynet J, Troupel S. Simple Method for Quantifying Alpha-Tocopherol in Low-Density+Very-Low-Density Lipoproteins and in High-Density Lipoproteins. Clin Chem 2019. [DOI: 10.1093/clinchem/38.9.1792] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
We assessed the distribution of alpha-tocopherol in serum lipoprotein samples after separating the lipoprotein fractions by either sequential ultracentrifugation or selective precipitation with sodium phosphotungstate-magnesium chloride reagent. alpha-Tocopherol concentrations were determined by reversed-phase high-performance liquid chromatography. After ultracentrifugation, we found that in men, low- and very-low-density serum lipoproteins (LDL-VLDL) contained 53.6% of alpha-tocopherol vs 46.4% in high-density lipoproteins (HDL). In women, serum LDL-VLDL contained 45.6% alpha-tocopherol after ultracentrifugation vs 54.4% in HDL. After selective precipitation, the proportions of alpha-tocopherol in men were 56.1% in LDL-VLDL vs 43.9% in HDL, and in women, 45.4% in LDL-VLDL vs 54.6% in HDL. After selective precipitation, alpha-tocopherol recovery from whole lipoprotein fractions was 97% to 100% vs 80% after ultracentrifugation, thus allowing more accurate alpha-tocopherol quantification than after separation by ultracentrifugation.
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Affiliation(s)
- G Carcelain
- Laboratoire de Biochimie, Hôpital de la Salpétrière, Paris, France
| | - F David
- Laboratoire de Biochimie, Hôpital de la Salpétrière, Paris, France
| | - S Lepage
- Laboratoire de Biochimie, Hôpital de la Salpétrière, Paris, France
| | | | - J Delattre
- Laboratoire de Biochimie, Hôpital de la Salpétrière, Paris, France
| | - A Legrand
- Laboratoire de Biochimie, Hôpital de la Salpétrière, Paris, France
| | - J Peynet
- Laboratoire de Biochimie, Hôpital de la Salpétrière, Paris, France
| | - S Troupel
- Laboratoire de Biochimie, Hôpital de la Salpétrière, Paris, France
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Giguet-Covex C, Ficetola GF, Walsh K, Poulenard J, Bajard M, Fouinat L, Sabatier P, Gielly L, Messager E, Develle AL, David F, Taberlet P, Brisset E, Guiter F, Sinet R, Arnaud F. New insights on lake sediment DNA from the catchment: importance of taphonomic and analytical issues on the record quality. Sci Rep 2019; 9:14676. [PMID: 31604959 PMCID: PMC6789010 DOI: 10.1038/s41598-019-50339-1] [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: 03/05/2019] [Accepted: 08/12/2019] [Indexed: 11/09/2022] Open
Abstract
Over the last decade, an increasing number of studies have used lake sediment DNA to trace past landscape changes, agricultural activities or human presence. However, the processes responsible for lake sediment formation and sediment properties might affect DNA records via taphonomic and analytical processes. It is crucial to understand these processes to ensure reliable interpretations for “palaeo” studies. Here, we combined plant and mammal DNA metabarcoding analyses with sedimentological and geochemical analyses from three lake-catchment systems that are characterised by different erosion dynamics. The new insights derived from this approach elucidate and assess issues relating to DNA sources and transfer processes. The sources of eroded materials strongly affect the “catchment-DNA” concentration in the sediments. For instance, erosion of upper organic and organo-mineral soil horizons provides a higher amount of plant DNA in lake sediments than deep horizons, bare soils or glacial flours. Moreover, high erosion rates, along with a well-developed hydrographic network, are proposed as factors positively affecting the representation of the catchment flora. The development of open and agricultural landscapes, which favour the erosion, could thus bias the reconstructed landscape trajectory but help the record of these human activities. Regarding domestic animals, pastoral practices and animal behaviour might affect their DNA record because they control the type of source of DNA (“point” vs. “diffuse”).
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Affiliation(s)
- C Giguet-Covex
- BioArch-Department of Archaeology, University of York, York, YO10 5DD, UK. .,EDYTEM, UMR 5204 CNRS, Univ. Savoie Mont Blanc, Pôle Montagne, 73376, Le Bourget du Lac, France.
| | - G F Ficetola
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LECA, 38000, Grenoble, France.,Department of Environmental Science and Policy, Università degli Studi di Milano, Via Celoria 26, 20133, Milano, Italy
| | - K Walsh
- BioArch-Department of Archaeology, University of York, York, YO10 5DD, UK
| | - J Poulenard
- EDYTEM, UMR 5204 CNRS, Univ. Savoie Mont Blanc, Pôle Montagne, 73376, Le Bourget du Lac, France
| | - M Bajard
- EDYTEM, UMR 5204 CNRS, Univ. Savoie Mont Blanc, Pôle Montagne, 73376, Le Bourget du Lac, France
| | - L Fouinat
- EDYTEM, UMR 5204 CNRS, Univ. Savoie Mont Blanc, Pôle Montagne, 73376, Le Bourget du Lac, France
| | - P Sabatier
- EDYTEM, UMR 5204 CNRS, Univ. Savoie Mont Blanc, Pôle Montagne, 73376, Le Bourget du Lac, France
| | - L Gielly
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LECA, 38000, Grenoble, France
| | - E Messager
- EDYTEM, UMR 5204 CNRS, Univ. Savoie Mont Blanc, Pôle Montagne, 73376, Le Bourget du Lac, France
| | - A L Develle
- EDYTEM, UMR 5204 CNRS, Univ. Savoie Mont Blanc, Pôle Montagne, 73376, Le Bourget du Lac, France
| | - F David
- CEREGE, UMR CNRS 7330, IRD 161-Marseille Université, Technopôle de l'Arbois Méditerranée, BP 80, 13545, Aix en Provence cedex 4, France
| | - P Taberlet
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LECA, 38000, Grenoble, France
| | - E Brisset
- Aix-Marseille Univ, Avignon Univ, CNRS, IRD, IMBE, Aix-en-Provence, France.,Institut Català de Paleoecologia Humana i Evolució Social (IPHES), Tarragona, Spain.,Àrea de Prehistòria, Universitat Rovira i Virgili, Tarragona, Spain
| | - F Guiter
- Aix-Marseille Univ, Avignon Univ, CNRS, IRD, IMBE, Aix-en-Provence, France
| | - R Sinet
- Aix-Marseille Univ, Avignon Univ, CNRS, IRD, IMBE, Aix-en-Provence, France
| | - F Arnaud
- EDYTEM, UMR 5204 CNRS, Univ. Savoie Mont Blanc, Pôle Montagne, 73376, Le Bourget du Lac, France
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Escourrou P, Bennegadi D, David F, Delmas P, El Hallak A, Ghassemi P, Gounaropoulos A, Houdard N, Houppe-Nousse M, Labarre J, Mafart B, Pretorian M, Samama P, Balekji Z, Colas Des Francs C, Puisais N, Davy J, Cercle Coeur Et Sommeil E. CARDIOSAS: a questionnaire by the “Cercle Coeur et Sommeil” to screen for Sleep Apnea in cardiovascular patients of private practice. Archives of Cardiovascular Diseases Supplements 2017. [DOI: 10.1016/s1878-6480(17)30324-5] [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: 10/19/2022]
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McGivney CL, Sweeney J, David F, O'Leary JM, Hill EW, Katz LM. Intra- and interobserver reliability estimates for identification and grading of upper respiratory tract abnormalities recorded in horses at rest and during overground endoscopy. Equine Vet J 2016; 49:433-437. [DOI: 10.1111/evj.12653] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Accepted: 11/06/2016] [Indexed: 10/20/2022]
Affiliation(s)
- C. L. McGivney
- School of Agriculture and Food Science; University College Dublin; Belfield, Dublin Ireland
| | - J. Sweeney
- School of Business; University College Dublin; Belfield, Dublin Ireland
| | - F. David
- Bjerke Dyrehospital En Rikstotoklinikk; Økern Torgv; Oslo Norway
| | - J. M. O'Leary
- School of Veterinary Medicine; University College Dublin; Belfield, Dublin Ireland
| | - E. W. Hill
- School of Agriculture and Food Science; University College Dublin; Belfield, Dublin Ireland
| | - L. M. Katz
- School of Veterinary Medicine; University College Dublin; Belfield, Dublin Ireland
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Hebbinckuys EC, David F, Merger D, Alba J. CP-132 Impact of pharmaceutical interventions in a medicine department. Eur J Hosp Pharm 2016. [DOI: 10.1136/ejhpharm-2016-000875.132] [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: 11/04/2022] Open
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11
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Tricaud C, Cousty M, Alexandre A, Tessier C, David F. Tendonitis of branches of the superficial digital flexor tendon in Standardbred racehorses: 15 cases. EQUINE VET EDUC 2015. [DOI: 10.1111/eve.12328] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- C. Tricaud
- Clinique Equine de Livet; St Michel de Livet France
| | - M. Cousty
- Clinique Equine de Livet; St Michel de Livet France
| | | | | | - F. David
- Mid-Atlantic Equine Center; Ringoes New Jersey USA
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12
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Crunelli V, David F, Lőrincz ML, Hughes SW. The thalamocortical network as a single slow wave-generating unit. Curr Opin Neurobiol 2015; 31:72-80. [DOI: 10.1016/j.conb.2014.09.001] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2014] [Revised: 08/29/2014] [Accepted: 09/01/2014] [Indexed: 12/28/2022]
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Maillard P, David F, Dechesne M, Bailly JB, Lesueur E. Caractérisation des îlots de chaleur urbains et test d’une solution d’humidification de chaussée dans le quartier de la Part-Dieu à Lyon. ACTA ACUST UNITED AC 2014. [DOI: 10.1051/tsm/201406023] [Citation(s) in RCA: 8] [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: 11/15/2022]
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14
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Taylor H, Schmiedt JT, Carçak N, Onat F, Di Giovanni G, Lambert R, Leresche N, Crunelli V, David F. Investigating local and long-range neuronal network dynamics by simultaneous optogenetics, reverse microdialysis and silicon probe recordings in vivo. J Neurosci Methods 2014; 235:83-91. [PMID: 25004203 PMCID: PMC4164909 DOI: 10.1016/j.jneumeth.2014.06.031] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [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: 05/29/2014] [Revised: 06/27/2014] [Accepted: 06/27/2014] [Indexed: 02/02/2023]
Abstract
Optogenetics and microdialysis can be successfully combined. How to manipulate circuits of spontaneous and evoked activities with drugs and lights? Thalamic control of delta waves and sleep spindles.
Background The advent of optogenetics has given neuroscientists the opportunity to excite or inhibit neuronal population activity with high temporal resolution and cellular selectivity. Thus, when combined with recordings of neuronal ensemble activity in freely moving animals optogenetics can provide an unprecedented snapshot of the contribution of neuronal assemblies to (patho)physiological conditions in vivo. Still, the combination of optogenetic and silicone probe (or tetrode) recordings does not allow investigation of the role played by voltage- and transmitter-gated channels of the opsin-transfected neurons and/or other adjacent neurons in controlling neuronal activity. New method and results We demonstrate that optogenetics and silicone probe recordings can be combined with intracerebral reverse microdialysis for the long-term delivery of neuroactive drugs around the optic fiber and silicone probe. In particular, we show the effect of antagonists of T-type Ca2+ channels, hyperpolarization-activated cyclic nucleotide-gated channels and metabotropic glutamate receptors on silicone probe-recorded activity of the local opsin-transfected neurons in the ventrobasal thalamus, and demonstrate the changes that the block of these thalamic channels/receptors brings about in the network dynamics of distant somatotopic cortical neuronal ensembles. Comparison with existing methods This is the first demonstration of successfully combining optogenetics and neuronal ensemble recordings with reverse microdialysis. This combination of techniques overcomes some of the disadvantages that are associated with the use of intracerebral injection of a drug-containing solution at the site of laser activation. Conclusions The combination of reverse microdialysis, silicone probe recordings and optogenetics can unravel the short and long-term effects of specific transmitter- and voltage-gated channels on laser-modulated firing at the site of optogenetic stimulation and the actions that these manipulations exert on distant neuronal populations.
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Affiliation(s)
- Hannah Taylor
- Neuroscience Division, School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3AX, UK
| | - Joscha T Schmiedt
- Neuroscience Division, School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3AX, UK
| | - Nihan Carçak
- Neuroscience Division, School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3AX, UK; Department of Pharmacology, Faculty of Pharmacy, Instanbul University, Istanbul, Turkey
| | - Filiz Onat
- Department of Pharmacology and Clinical Pharmacology, Faculty of Medicine, Marmara University, Istanbul, Turkey
| | - Giuseppe Di Giovanni
- Neuroscience Division, School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3AX, UK; Department of Biochemistry and Physiology, University of Malta, Malta
| | - Régis Lambert
- Sorbonne Universités, UPMC Univ Paris 06, UM CR18, Neuroscience Paris Seine (NPS), Paris F-75005, France; CNRS, UMR 8246, NPS, Paris F-75005, France
| | - Nathalie Leresche
- Sorbonne Universités, UPMC Univ Paris 06, UM CR18, Neuroscience Paris Seine (NPS), Paris F-75005, France; CNRS, UMR 8246, NPS, Paris F-75005, France
| | - Vincenzo Crunelli
- Neuroscience Division, School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3AX, UK.
| | - Francois David
- Neuroscience Division, School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3AX, UK.
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15
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Guionet A, Joubert-Durigneux V, Packan D, Cheype C, Garnier JP, David F, Zaepffel C, Leroux RM, Teissié J, Blanckaert V. Effect of nanosecond pulsed electric field on Escherichia coli
in water: inactivation and impact on protein changes. J Appl Microbiol 2014; 117:721-8. [DOI: 10.1111/jam.12558] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 05/23/2014] [Accepted: 05/29/2014] [Indexed: 11/29/2022]
Affiliation(s)
- A. Guionet
- VERI; Chemin de la Digue; Maisons Lafitte France
- CNRS UMR5089 - IPBS (Institut de Pharmacologie et de Biologie Structurale); Toulouse France
- Université de Toulouse; UPS; IPBS; Toulouse France
| | | | - D. Packan
- ONERA; DMPH; Chemin de la Hunière; Palaiseau France
| | - C. Cheype
- CERPEM; Laval Mayenne Technopole; Laval France
| | | | - F. David
- VERI; Chemin de la Digue; Maisons Lafitte France
| | - C. Zaepffel
- ONERA; DMPH; Chemin de la Hunière; Palaiseau France
| | - R.-M. Leroux
- Mer, Molécules, Santé; IUML-FR 3473 CNRS, Université du Maine; IUT de Laval; Département Génie Biologique, Laval France
| | - J. Teissié
- CNRS UMR5089 - IPBS (Institut de Pharmacologie et de Biologie Structurale); Toulouse France
- Université de Toulouse; UPS; IPBS; Toulouse France
| | - V. Blanckaert
- Mer, Molécules, Santé; IUML-FR 3473 CNRS, Université du Maine; IUT de Laval; Département Génie Biologique, Laval France
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16
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Abstract
Since their discovery more than 30 years ago, low-threshold T-type Ca(2+) channels (T channels) have been suggested to play a key role in many EEG waves of non-REM sleep, which has remained exclusively linked to the ability of these channels to generate low-threshold Ca(2+) potentials and associated high-frequency bursts of action potentials. Our present understanding of the biophysics and physiology of T channels, however, highlights a much more diverse and complex picture of the pivotal contributions that they make to different sleep rhythms. In particular, recent experimental evidence has conclusively demonstrated the essential contribution of thalamic T channels to the expression of slow waves of natural sleep and the key role played by Ca(2+) entry through these channels in the activation or modulation of other voltage-dependent channels that are important for the generation of both slow waves and sleep spindles. However, the precise contribution to sleep rhythms of T channels in cortical neurons and other sleep-controlling neuronal networks remains unknown, and a full understanding of the cellular and network mechanisms of sleep delta waves is still lacking.
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Affiliation(s)
- Vincenzo Crunelli
- School of Biosciences, Cardiff University, Museum Avenue, Cardiff, CF10 3US, UK,
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Affiliation(s)
- G. Ardisson
- Laboratoire de Radiochimie, Université de Nice Sophia-Antipolis, F-06108 Nice Cédex, France
| | - A.A. Koua
- Laboratoire de Radiochimie, Université de Nice Sophia-Antipolis, F-06108 Nice Cédex, France
| | - V. Barci
- Laboratoire de Radiochimie, Université de Nice Sophia-Antipolis, F-06108 Nice Cédex, France
| | - C. Marsol
- Laboratoire de Radiochimie, Université de Nice Sophia-Antipolis, F-06108 Nice Cédex, France
| | - G. Barci-Funel
- Laboratoire de Radiochimie, Université de Nice Sophia-Antipolis, F-06108 Nice Cédex, France
| | - F. David
- Institut de Physique Nucléaire, BP 1, F-91406 Orsay Cédex, France
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18
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Cadby JA, David F, van de Lest C, Bosch G, van Weeren PR, Snedeker JG, van Schie HTM. Further characterisation of an experimental model of tendinopathy in the horse. Equine Vet J 2013; 45:642-8. [DOI: 10.1111/evj.12035] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Accepted: 12/02/2012] [Indexed: 01/07/2023]
Affiliation(s)
- J. A. Cadby
- Department of Equine Sciences; Faculty of Veterinary Medicine; Utrecht University; The Netherlands
- Department of Orthopedics; University of Zurich; Switzerland
| | - F. David
- Department of Equine Sciences; Faculty of Veterinary Medicine; Utrecht University; The Netherlands
- Large Animal Surgery, Veterinary Clinical Studies; School of Agriculture, Food Science and Veterinary Medicine; University College Dublin; Ireland
| | - C. van de Lest
- Department of Equine Sciences; Faculty of Veterinary Medicine; Utrecht University; The Netherlands
| | - G. Bosch
- Department of Equine Sciences; Faculty of Veterinary Medicine; Utrecht University; The Netherlands
| | - P. R. van Weeren
- Department of Equine Sciences; Faculty of Veterinary Medicine; Utrecht University; The Netherlands
| | - J. G. Snedeker
- Department of Orthopedics; University of Zurich; Switzerland
| | - H. T. M. van Schie
- Department of Equine Sciences; Faculty of Veterinary Medicine; Utrecht University; The Netherlands
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Medvedovici A, David F, Sandra P. Determination of the rodenticides warfarin, diphenadione and chlorophacinone in soil samples by HPLC-DAD. Talanta 2012; 44:1633-40. [PMID: 18966902 DOI: 10.1016/s0039-9140(97)00068-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/1996] [Revised: 10/28/1996] [Accepted: 11/21/1996] [Indexed: 10/17/2022]
Abstract
A HPLC-DAD method is described for the analysis of the rodenticides warfarin, diphenadione and chlorophacinone, together with the phenylurea herbicides isoproturon and diuron, in soil samples. The HPLC parameters have been optimised to provide baseline separation with symmetrical peakshapes in short analysis times. The sample preparation consists of Soxhlet extraction followed by SPE clean-up on cyanopropyl silica.
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Affiliation(s)
- A Medvedovici
- Department of Organic Chemistry, University of Gent, Krijgslaan 281 (S4), B-9000, Gent, Belgium
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20
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Corcos D, Robichaud J, David F, Vaillancourt D, Poon C, Rafferty M, Comella C, Kohrt W, Leurgans S. 24 Months of Exercise Improves the Motor Symptoms in Parkinson's Disease (S02.003). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.s02.003] [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: 11/15/2022] Open
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Corcos D, Robichaud J, David F, Vaillancourt D, Poon C, Rafferty M, Comella C, Kohrt W, Leurgans S. 24 Months of Exercise Improves the Motor Symptoms in Parkinson's Disease (IN6-2.005). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.in6-2.005] [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: 11/15/2022] Open
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Schneeweiss W, Puggioni A, David F. Comparison of ultrasound-guided vs. ‘blind’ techniques for intra-synovial injections of the shoulder area in horses: Scapulohumeral joint, bicipital and infraspinatus bursae. Equine Vet J 2012; 44:674-8. [DOI: 10.1111/j.2042-3306.2011.00540.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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David F, Hebeisen M, Schade G, Franco-Lara E, Di Berardino M. Viability and membrane potential analysis of Bacillus megaterium cells by impedance flow cytometry. Biotechnol Bioeng 2011; 109:483-92. [PMID: 21956238 DOI: 10.1002/bit.23345] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Revised: 08/18/2011] [Accepted: 09/12/2011] [Indexed: 11/10/2022]
Abstract
Single cell analysis is an important tool to gain deeper insights into microbial physiology for the characterization and optimization of bioprocesses. In this study a novel single cell analysis technique was applied for estimating viability and membrane potential (MP) of Bacillus megaterium cells cultured in minimal medium. Its measurement principle is based on the analysis of the electrical cell properties and is called impedance flow cytometry (IFC). Comparatively, state-of-the-art fluorescence-based flow cytometry (FCM) was used to verify the results obtained by IFC. Viability and MP analyses were performed with cells at different well-defined growth stages, focusing mainly on exponential and stationary phase cells, as well as on dead cells. This was done by PI and DiOC(2)(3) staining assays in FCM and by impedance measurements at 0.5 and 10 MHz in IFC. In addition, transition growth stages of long-term cultures and agar plate colonies were characterized with both methods. FCM and IFC analyses of all experiments gave comparable results, quantitatively and qualitatively, indicating that IFC is an equivalent technique to FCM for the study of physiological cell states of bacteria.
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Affiliation(s)
- F David
- Institute of Biochemical Engineering, Technische Universität Braunschweig, Braunschweig, Germany
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Tscherter A, David F, Ivanova T, Deleuze C, Renger JJ, Uebele VN, Shin HS, Bal T, Leresche N, Lambert RC. Minimal alterations in T-type calcium channel gating markedly modify physiological firing dynamics. J Physiol 2011; 589:1707-24. [PMID: 21320888 DOI: 10.1113/jphysiol.2010.203836] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
T-type calcium channel isoforms expressed in heterologous systems demonstrate marked differences in the biophysical properties of the resulting calcium currents. Such heterogeneity in gating behaviour not only reflects structural differences but is also observed following the regulation of channel activity by a number of ligands. However, the physiological impact of these differences in gating parameters of the T channels has never been evaluated in situ where the unique interplay between T-type calcium and other intrinsic currents is conserved, and T channel activation can be triggered by synaptic stimulation. Here, using the dynamic clamp technique, artificial T conductances were re-incorporated in thalamic neurons devoid of endogenous T currents to dissect the physiological role of the T current gating diversity on neuronal excitability. We demonstrate that the specific kinetics of the T currents in thalamocortical and nucleus reticularis thalami neurons determine the characteristic firing patterns of these neurons. We show that subtle modifications in T channel gating that are at the limit of the resolution achieved in classical biophysical studies in heterologous expression systems have profound consequences for synaptically evoked firing dynamics in native neurons. Moreover, we demonstrate that the biophysical properties of the T current in the voltage region corresponding to the foot of the activation and inactivation curves drastically condition physiologically evoked burst firing with a high degree of synaptic input specificity.
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Mackensen F, David F, Schwenger V, Smith LK, Rajalingam R, Levinson RD, Austin CR, Houghton D, Martin TM, Rosenbaum JT. HLA-DRB1*0102 is associated with TINU syndrome and bilateral, sudden-onset anterior uveitis but not with interstitial nephritis alone. Br J Ophthalmol 2010; 95:971-5. [PMID: 21059595 DOI: 10.1136/bjo.2010.187955] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- F Mackensen
- Interdisciplinary Uveitis Center, University Eye Hospital, INF 400, 69120 Heidelberg, Germany.
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David F, Westphal R, Bunk B, Jahn D, Franco-Lara E. Optimization of antibody fragment production in Bacillus megaterium: the role of metal ions on protein secretion. J Biotechnol 2010; 150:115-24. [PMID: 20670661 DOI: 10.1016/j.jbiotec.2010.07.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2010] [Revised: 07/14/2010] [Accepted: 07/21/2010] [Indexed: 11/25/2022]
Abstract
The effect of the concentration of metal ions in minimal media has been shown to be very important for the production and secretion of the antibody fragment D1.3 scFv in Bacillus megaterium YYBm1. The best media compositions for biomass and antibody fragment formation were evaluated using a genetic algorithm. The screening was carried out in 96 microtiter deep well plates with 900 μL cultivation volume. In 7 generations, 240 different kinds of media were tested, key elements for production and secretion were detected and a 117% increase in production of antibody fragment compared to the previously used medium could be achieved. In addition, media with a higher biomass formation (+84%) or with both more biomass and a higher production of antibody fragment (Pareto-front members) were found. Interestingly the best media for protein production and secretion were different in their composition, with regards to the metal ion concentration levels. From data derived experimentally and from the genome, magnesium was shown to be one of the key components of the metal ions tested for biomass formation and especially for production and secretion of the antibody fragment D1.3 scFv.
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Affiliation(s)
- F David
- Institute of Biochemical Engineering, Technische Universität Braunschweig, Gaussstrasse 17, 38106 Braunschweig, Germany
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Abstract
This clinical report describes 8 cases of branchial remnant cysts (BRC) in the horse. The horses presented with bimodal age distribution, with 5 cases in mature horses (age 8-21 years) and 3 in foals (age 1, 6 and 10 months). Mature cases presented for dysphagia or intermittent oesophageal obstruction (2/5), and retropharyngeal swelling (3/5), whereas respiratory stridor and visible mass were presenting complaints in the foals. Presence of a right-sided (5/8) or dorsally located (2/8) palpable retropharyngeal mass of 3-35 cm diameter was noted clinically; one left-sided mass was identified as an incidental finding at necropsy. Ultrasonography typically revealed a thick-walled cyst containing hypoechoic fluid with dependent hyperechoic masses consistent with blood clots. Radiographs and upper airway endoscopy were also consistent with a retropharyngeal mass. Fluid cytology revealed chronic haemorrhage in 6/8 cases, and squamous epithelial cells in one case. Histopathology in all cases demonstrated an epithelium-lined cyst with no smooth muscle or thyroid tissue. Two cases was subjected to euthanasia; one due to concurrent laryngeal anomalies and one due to financial constraints. The remaining 5 cases were treated via surgical excision. Post operatively, right laryngeal hemiplegia was observed in 4/5 cases. All previous reports of BRC in the horse have described juvenile individuals. Brachial remnant cyst should be considered a differential diagnosis for mature horses with masses of the throatlatch area and can be definitively diagnosed by the presence of squamous epithelium in aspirated fluid or by histopathology of the excised mass. Right recurrent laryngeal nerve damage is a common complication of surgery.
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Affiliation(s)
- R D Nolen-Walston
- New Bolton Center, University of Pennsylvania School of Veterinary Medicine, 382 West Street Rd, Kennett Square, Pennsylvania 19348, USA
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Affiliation(s)
- M Spriet
- Département de Sciences Cliniques, Faculté de Médecine Vétérinaire, Université de Montreal, Saint-Hyacinthe, Québec, Canada
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Maslennikov A, Fourest B, David F, Masson M. Electrochemical dissolution of simulated "white inclusions" in nitric acid. Linear voltammetry study with Mo, Re, Ru metals and their alloys electrodes. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.91.7.419.20014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Summary
The process of electrochemical dissolution of pure Mo, Re and Ru metals, as well as their alloys 52.5 at. Mo – 47.5 at. Re and 90 at. Mo – 10 at. Ru in 0.5-6.0M HNO3 was studied using the linear voltammetry technique. The dissolution potentials of the pure metals were found to increase from 0.39 to 0.48V/SCE (Mo), from 0.7 to 0.81V/SCE (Re) and from 1.15 to 1.25V/SCE (Ru) with the augmentation of HNO3 concentration in the electrolyte. The dissolution potentials of the alloys 52.5 at. Mo + 47.5 at. Re and 90 at. Mo + 10 at. Ru were found to change from 0.49 to 0.58 (Mo-Re) and from 0.92 to 1.09 (Mo-Ru) when HNO3 concentration in the electrolyte increased from 0.5 to 6.0M. The secondary passivation of Mo-containing electrodes was observed in the solutions 2.0-6.0M HNO3 at the potentials from 1.4 to 1.9V/SCE, decreasing their dissolution rate in this range of potentials. The maximum electrochemical dissolution rate constants of pure Mo, Re, Ru metals and Mo-Re, Mo-Ru alloys have been estimated using the data of linear voltammetry. The obtained values (1.85-2.20g/cm2 h for Mo-Re and 0.58-0.64g/cm2 h for Mo-Ru alloys electrochemical dissolution) are found to be thousand times greater, than reported for the process of chemical dissolution of corresponding alloys in boiling HNO3.
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Abstract
Abstract
Single crystals of Al1-
x
Ga
x
PO4 of various mole fractions x were grown from phosphoric acid solutions under hydrothermal conditions using the slow-heating method. In order to relate the parameters of this low-quartz structure analogue and the observed phase transitions to the respective mole fraction, the crystals were investigated by means of electron probe microanalysis, X-ray powder diffraction and differential thermal analysis. The results are discussed in terms of the segregation effects occuring during growth. The limiting geometrical parameters for the existence of the high-quartz phase are compared to the values given in the literature.
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Sladkov V, Peretroukhine V, Maslennikov A, David F. Differential pulse voltammetric determination of U(VI)-Tc(VII) and U(VI)-Cr(VI) in alkaline solutions. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.2001.89.3.139] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Differential pulse voltammetric (DPV) technique has been developed for the simultaneous determination of the elements in Tc(VII)-U(VI) and U(VI)-Cr(VI) mixtures in alkaline solutions. The method gave a precision of about 14% to 2% in the range of 1×10-7--1×10-4 for Cr(VI) and Tc(VII) and 1×10-6--1×10-4 for U(VI). The detection limits are 8×10-8 mol l-1 for Tc(VII) and 3×-7 mol l-1 for Cr(VI), and 8×10-7 for U(VI). It has been established that Tc(VII) could be determined in the presence of about 350 excess fold U(VI). The reduction of Tc(VII) with hydrazine has been suggested to eliminate the effect of Tc(VII) ions on the U(VI) determination. U(VI) has been determined in the presence of Cr(VI) up to molar concentration ratio U(VI)/Cr(VI)=1:1, while Cr(VI) could be determined in the presence of U(VI) in the solutions with up to molar concentration ratio Cr(VI)/U(VI)=1:15. The reliability of the determination of the elements of Tc(VII)-U(VI) and U(VI)-Cr(VI) mixtures in alkaline solution has been tested by a standard addition method.
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Maslennikov A, Fourest B, David F, Masson M. Electrochemical dissolution of simulated "white inclusions". Kinetics and material balance for Mo, Re, Ru metals and their alloys during electrochemical dissolution in nitric acid. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.91.12.761.23426] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
The kinetics of pure Mo, Re and Ru metals, as well as their alloys 52.5at. Mo – 47.5at. Re and 90at. Mo – 10at. Ru electrochemical dissolution during potential controlled electrolysis at a temperature T=25 °C in 0.5–6.0M HNO3 solutions were studied. The dissolution kinetics for all metal and alloy electrodes under study were found to be of zero order vs. metal concentration in the electrolyte. Rate constants for Mo electrochemical dissolution increased from 1.68×10-3 to 5.99×10-3mol cm-2h-1 with the growth of HNO3 concentration in the electrolyte from 0.5 to 4.0M. Further increase of the acid concentration in the solution to 6.0M did not result in the acceleration of Mo electrochemical dissolution. Rate constants of Re and Ru metals electrochemical dissolution increased monotonously from 4.27×10-4 to 1.7×10-3mol cm-2 h-1 for Re and from 1.28×10-4 to 1.61×10-3mol cm-2 h-1 for Ru with the rise of HNO3 concentration from 0.5 to 6.0M. Dissolution of Mo-Re and Mo-Ru alloys was congruent. With the increase of HNO3 concentration in the electrolyte from 0.5 to 6.0M, the dissolution rate constant of Mo-Re alloy was increasing from 1.33 to 7.60×10-3mol(Mo+Re)cm-2h-1. Maximum rates of Mo-Ru alloy electrochemical dissolution from 2.21×10-3 to 3.28×10-3mol(Mo+Ru)cm-2 h-1 were observed in 2.0–4.0M HNO3 at the electrolysis potential E=1.6V/SCE. The main electrochemical and chemical processes occurring at the metal and alloy electrodes and resulting in the metals dissolution are pointed out.
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Fourest B, Maslennikov A, David F, Masson M. Determination of Mo(VI), Ru(III), Re(VII) and NO3
- in the solutions of nuclear fuel cycle by capillary electrophoresis. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.91.8.479.20003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Summary
A method for simultaneous quantitative determination of Mo(VI), Re(VII), Ru(III) and NO3
- ions in aqueous solutions, using capillary zone electrophoresis (CZE) technique with direct UV detection, was developed. Electrophoretic mobility of Ru(III) ions in 0.1M NaHCO3 solution was determined as 6.0×10-8m2 V-1 s-1 at 25 °C. The best analytical characteristics of the developed method were achieved with a 100mM carbonate buffer solution containing 0.3mM TTAB, at a pH value of 9.8 and at an applied voltage of 10kV. Under these conditions, a linear relationship between the measured absorbance (λ=230nm) and the concentration of the species under study were observed in the range 5×10-6–10-3M for Mo(VI), 7×10-6–10-3M for Re(VII) and 10-5–-4M for Ru(III). The minimum detectable concentrations were determined as 4.1×10-6M for NO3
-, 5.2×10-6M for Mo(VI), 7.4×10-6M for Re(VII) and 1.0×10-5M for Ru(III). The accuracy of quantitative determination was estimated as 3%–5% for NO3
- and 5%–6% for Mo(VI), Re(VII) and Ru(III) ions. The presence of 0.06M NaNO3 (HNO3) and of 10-3M U(VI) in the sample affected neither the detection limits of the species under study nor the selectivity of the method.
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David F, Korneli C, Schön M, Westphal R, Franco-Lara E. Process optimization of antibody fragment-secreting Bacillus megaterium cultivations and its effect on the cell heterogeneity. N Biotechnol 2009. [DOI: 10.1016/j.nbt.2009.06.174] [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: 10/20/2022]
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Lavoie JP, Thompson D, Hamilton E, Debrue M, David F, Hickey G. Effects of a MAPK p38 inhibitor on lung function and airway inflammation in equine recurrent airway obstruction. Equine Vet J 2009; 40:577-83. [PMID: 19031513 DOI: 10.2746/042516408x284646] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
REASONS FOR PERFORMING STUDY It has been suggested that many of the beneficial effects of corticosteroids are mediated through mitogen-activated protein kinase (MAPK) p38 inhibition. OBJECTIVE To investigate the efficacy of the MAPK p38 inhibitor compound MRL-EQ1 to either prevent (Phase 1) or treat (Phase 2) recurrent airway obstruction (RAO) in horses. METHODS MRL-EQ1 was administered i.v. at a dosage of 0.75-1.5 mg/kg bwt q. 12 h. In Phase 1, susceptible horses in clinical remission were divided into 2 groups (n = 5/group), based on historical values of respiratory mechanics. All horses were entered in the study in pairs (one control, one treated horse) and exposed to the same environmental challenge (stabling, mouldy hay and dusty conditions). The treatment group received MRL-EQ1 for 14 days while the control horses were untreated during the same period. In Phase 2, affected horses were ranked by severity of respiratory dysfunction and split randomly into either dexamethasone or MRL-EQ1 treatment groups (n = 5/group). Bronchoalveolar lavage fluid, respiratory mechanic measurements, MRL-EQ1 plasma concentration and tumour necrosis factor (TNF) whole blood activity were evaluated sequentially. RESULTS In Phase 1, MRL-EQ1 did not prevent the occurrence of clinical signs and pulmonary inflammation. However, treatment was associated with a reduction in severity and a delay in the onset of signs and a reduction in pulmonary neutrophilia. In Phase 2, plasma concentrations achieved resulted in ex vivo suppression of lipopolysaccharide-induced TNF production in equine blood. MRL-EQ1 did not improve airway inflammation or lung function and was associated in a dose dependent manner with behavioural (depression, excitability) and blood changes (neutrophilia, increased serum muscle enzyme concentrations). CONCLUSIONS Inhibition of p38 in the horse was partially effective in reducing clinical signs and airway inflammation when administered prior to, but not during clinical exacerbation in RAO. POTENTIAL RELEVANCE Inhibitors of p38 MAPK with a better toxicity profile may be effective in the prevention or treatment of RAO.
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Affiliation(s)
- J P Lavoie
- Faculté de médecine vétérinaire, Université de Montréal, C.P 5000, Saint-Hyacinthe, Quebec J2S 7C6, Canada
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Mercadante S, Intravaia G, Villari P, Ferrera P, David F, Casuccio A, Mangione S. Clinical and financial analysis of an acute palliative care unit in an oncological department. Palliat Med 2008; 22:760-7. [PMID: 18715976 DOI: 10.1177/0269216308094338] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The aim of this article is to describe the clinical activity and medical intervention of an acute model of palliative care unit (APC), as well as the reimbursement procedures and economic viability. A sample of 504 patients admitted at an APC in 1 year was surveyed. Indications for admission, pain and symptom intensity, analgesic treatments, procedures, instrumental examinations and modalities of discharge were recorded. For each patient, tariff for reimbursement was calculated according to the existent disease related grouping (DRG) system. The mean age was 62 years, and 246 patients were males. The mean hospital stay was 5.4 days. Pain control was the most frequent indication for admission. All patients had laboratory tests and several instrumental examinations. Almost all patients were prescribed one or more opioids at significant doses, and different routes of administration, as well as medication as needed. 59 patients received blood cell transfusions and 34 interventional procedures. Only 40 patients died in the unit, 11 of them being sedated at the end of life. Treatment efficacy was considered optimal and mild in 264 and 226 patients respectively. A mean of 3019 euros for admission was reimbursed by the Health Care System. APCs are of paramount importance within an oncological department, as they provide effective and intensive treatments during the entire course of disease, providing a simultaneous and integrated approach. Our findings also suggest both a cost and quality incentive for oncological departments to develop APC.
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Affiliation(s)
- S Mercadante
- Anesthesia and Intensive Care Unit & Pain Relief and Palliative Care Unit, La Maddalena Cancer Center, Palermo, Italy.
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Peretrukhin VF, Moisy F, Maslennikov AG, Simonoff M, Tsivadze AY, German KE, David F, Fourest B, Sergeant C, Lecomte M. Physicochemical behavior of uranium and technetium in some new stages of the nuclear fuel cycle. RUSS J GEN CHEM+ 2008. [DOI: 10.1134/s107036320805037x] [Citation(s) in RCA: 5] [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: 11/23/2022]
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Abstract
We prove that the Lässig-Wiese (LW) field theory for the freezing transition of the secondary structure of random RNA is renormalizable to all orders in perturbation theory. The proof relies on a formulation of the model in terms of random walks and on the use of the multilocal operator product expansion. Renormalizability allows us to work in the simpler scheme of open polymers, and to obtain the critical exponents at 2-loop order. It also allows us to prove some exact exponent identities, conjectured by LW.
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Affiliation(s)
- Francois David
- Service de Physique Théorique, URA 2036 of CNRS, CEA Saclay, 91191 Gif sur Yvette Cedex, France
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Abstract
REASON FOR PERFORMING STUDY Coxofemoral joint pain is probably underestimated due to difficulties in identifying hip pain. The deep location of the joint and proximity of the sciatic nerve make arthrocentesis based on external landmarks a difficult and potentially risky procedure in mature horses. OBJECTIVES To describe an ultrasound-guided injection technique of the coxofemoral joint in standing horses and to evaluate its accuracy and potential difficulties/complications. METHODS Nine mature horses had both pelvic areas prepared for sterile ultrasound examination (3.5 MHz curvilinear probe). Coxofemoral joints were located and penetrated at their craniodorsolateral aspect under ultrasonographic guidance and injected with sterile contrast medium. A standing ventrodorsal radiographic view of each hemipelvis centred on the hip was obtained for each horse to assess the injection site. Horses were evaluated for 10 days following injection for possible complications. RESULTS Intra-articular injection was successful in all 18 joints. The procedure was well tolerated by horses under minimal restraint. Mean +/- s.d. needle repositionings required before accurate placement was 1.5 +/- 1.3 per joint. Once the needle was in the joint, synovial fluid was obtained in 7/18 joints. Minimal periarticular contrast medium was detected in 2/18 joints. Mean +/- s.d. ultrasonographic examination time required for coxofemoral localisation, accurate needle positioning and injection was 4.3 +/- 2.1 min. No complications were observed in the 10 days following injection. CONCLUSION The ultrasound-guided coxofemoral arthrocentesis is an accurate, reliable and safe technique that offers a real time evaluation of needle introduction into the deep and narrow coxofemoral joint space. POTENTIAL RELEVANCE Although this technique remains to be tested on clinical cases, it is a promising tool to facilitate diagnosis of coxofemoral pain, septic arthritis or administration of intra-articular medication.
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Affiliation(s)
- F David
- Département des Sciences Cliniques, Faculté de Médecine Vétérinaire, Université de Montréal, C.P. 5000, Saint-Hyacinthe, Québec J2S 7C6, Canada
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Norman A, Börjeson H, David F, Tienpont B, Norrgren L. Studies of uptake, elimination, and late effects in Atlantic salmon (Salmo salar) dietary exposed to Di-2-ethylhexyl phthalate (DEHP) during early life. Arch Environ Contam Toxicol 2007; 52:235-42. [PMID: 17180483 DOI: 10.1007/s00244-005-5089-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2005] [Accepted: 07/17/2005] [Indexed: 05/13/2023]
Abstract
The phthalate esters are a group of industrial chemicals considered to have endocrine-disrupting properties. The most common tonnage product among these, di-2-ethylhexyl phthalate (DEHP), is widely spread in the environment. The objectives with the present work were to study uptake and metabolism of orally administered DEHP and its major metabolite mono-2-ethyl hexyl phthalate (MEHP) and to evaluate the impact of early life exposure on sex differentiation in Atlantic salmon. The feeding with contaminated diet started immediately after yolk sac resorption and continued for 4 weeks. Nominal concentrations of DEHP in the diet were 400 (measured 359), 800 (measured 827), and 1500 (measured 1648) mg DEHP/kg and a control group was fed food mixed with solvent. After the exposure period, fish were fed non-contaminated diet until final sampling 4 months post-exposure. There were no effects on growth or survival of the fish and no late effects on hepatosomatic index or sex ratio. However, the histological examination of gonads from fish exposed to 1500 mg DEHP/kg revealed a small but significant incidence (3%) of intersex fish (ovo-testis). Chemical residues of DEHP and MEHP were analyzed weekly during the first 3 months of the post-exposure period. Both DEHP and MEHP were rapidly eliminated to near background levels within one week post exposure. The study indicates that exposure of Atlantic salmon to relatively high concentrations of DEHP during a sensitive part of the life cycle may interfere with gonad differentiation.
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Affiliation(s)
- A Norman
- Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences, P.O. Box 7028, S-750 07, Uppsala, Sweden
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Hantash J, Bartlett A, Oldfield P, Dénès G, O'Rielly R, David F. Application of an in-line imprinted polymer column in a potentiometric flow-injection chemical sensor to the determination of the carbamate pesticide carbaryl in complex biological matrices. Anal Bioanal Chem 2006; 387:351-7. [PMID: 17103148 DOI: 10.1007/s00216-006-0898-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2006] [Revised: 09/21/2006] [Accepted: 10/02/2006] [Indexed: 11/26/2022]
Abstract
A flow-injection biosensor-like system based on a nonenzymatic approach has been developed to determine the carbamate pesticide carbaryl in complex biological samples without lengthy and expensive extraction steps. Molecularly imprinted polymeric beads were used to immobilize carbaryl from biological samples. pH variation permitted the elution of carbaryl from the binding cavity to the flow cell. A pH electrode was used to detect changes in the charge of carbaryl in the sample solution resulting from the protonation and deprotonation of the molecule over different pH ranges. At pH 2.0, the secondary amine group is protonated, giving a (+1) charge to the carbaryl molecule. At pH 8.0, the ionized carbaryl loses a proton to become neutral, changing the local pH of the flow cell. The pH change at the flow cell generated by the deprotonation of carbaryl ion in alkaline medium was used to determine the carbaryl concentration. Parameters influencing the performance of the system were optimized for use in the detection procedure. The validated biosensor-like system had a carbaryl detection limit of 10.0 microg/mL and a response that was linear (r2>0.98) over the concentration range of 10.0-00 microg/mL.
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Affiliation(s)
- Jamil Hantash
- Charles River Laboratories Preclinical Services Montreal, Inc., 87 Senneville Road, Senneville, Québec, H9X 3R3, Canada.
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Purans J, Fourest B, Cannes C, Sladkov V, David F, Venault L, Lecomte M. Structural Investigation of Pd(II) in Concentrated Nitric and Perchloric Acid Solutions by XAFS. J Phys Chem B 2005; 109:11074-82. [PMID: 16852349 DOI: 10.1021/jp045489n] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
XAFS spectra of palladium(II) in concentrated HNO3/HClO4 acid mixtures have been recorded and analyzed. Structural parameters of the Pd(H2O)4(2+) complex and the mixed nitric Pd(NO3)2(H2O)2 complex, for the first time, were determined by the XAFS method. For pure 5 M HClO4 and for mixtures (0-0.3 M HNO3), the XAFS spectra of the 0.02 M Pd solutions are indeed very similar and originated from four Pd-O(w) equivalent distances. For the Pd(H2O)4(2+) square-planar aqua ion in strong perchloric acid, the use of an FEFF6 theoretical approach led to a first-shell Pd-O(w) distance of 2.00 (1) A and a Debye-Waller (DW) factor of sigma2 = 0.0030 (3) A2. Four water molecules are tightly bound to the Pd2+ ion in the equatorial plane, while two (or one) axial water molecules are weakly bound to the metal ion at 2.5 A with a DW factor of 0.015 (5) A2. For highly concentrated mixtures (4-6 M HNO3) and for pure concentrated (4-6 M) nitric acid as well as for crystalline powder Pd(NO3)2(H2O)2, the XAFS spectra are very similar and are determined by the mixed nitric complex Pd(NO3)2(H2O)2: four Pd-O near-equivalent distances of 2.01 (1) A from two H2O and two NO3 molecules with a total DW factor of sigma2 = 0.0037 (3) A2. Moreover, two Pd---N distances of 2.8-2.9 A were determined in the second coordination shell. Finally, for intermediate mixtures (1-3 M HNO3 in 5 M HClO4), the XAFS spectra are a superposition of the XAFS of Pd(H2O)4(2+) and Pd(NO3)2(H2O)2 complexes. The mean ligand number NO3(-) around Pd2+ has been calculated, and the XAFS results at pH close to zero confirm the spectrophotometric results previously published.
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Affiliation(s)
- J Purans
- Institut de Physique Nucléaire, 91406 Orsay Cedex, France.
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Fournier S, Chaffaut C, Maillard A, Loze B, Lascoux C, Gérard L, Timsit J, David F, Bergmann JF, Oksenhendler E, Sereni D, Chevret S, Molina JM. Factors associated with virological response in HIV-infected patients failing antiretroviral therapy: a prospective cohort study. HIV Med 2005; 6:129-34. [PMID: 15807719 DOI: 10.1111/j.1468-1293.2005.00275.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 11/28/2022]
Abstract
OBJECTIVES To assess the antiviral response to optimized therapy following genotypic resistance testing and to identify factors associated with virological response in HIV-1-infected patients failing antiretroviral therapy. METHODS A prospective cohort study was conducted in 344 HIV-1-infected patients who underwent genotypic resistance testing because of virological failure. Virological response was defined as a plasma HIV RNA level below 200 HIV-1 RNA copies/mL or a drop of plasma viral load from baseline of more than 1 log10. A multivariate logistic regression analysis was performed to identify factors associated with virological response. RESULTS The median age of the patients was 40 years, with a male to female ratio of 4:1. Fifty-one per cent of patients had received the three major classes of antiretrovirals and the median duration of previous antiretroviral therapy was 4.6 years. At baseline, the median plasma HIV RNA level was 4.4 log10 copies/mL and the median CD4 cell count was 274 cells/microL. At 3 months, 55% of patients (188 of 344) had a virological response, which was sustained at 6 months (53%). Predictors of virological response were exposure to two or fewer protease inhibitors [odds ratio (OR) 1.8; P=0.046], and use in optimized therapy of a new class of antiretrovirals (OR 2.9; P=0.006), of more than two new drugs (OR 3.0; P<0.0001), of abacavir (OR 1.9; P=0.03), or of lopinavir/ritonavir (OR 3.7; P=0.0002). CONCLUSIONS A high proportion of patients achieved a short-term virological response in this cohort study. Patients with the least experience of protease inhibitor treatment and in whom a new class of antiretroviral, more than two new drugs, abacavir or lopinavir/ritonavir was used in optimized therapy had the best virological outcome.
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Affiliation(s)
- S Fournier
- Department of Infectious Diseases, Saint-Louis Hospital, Assistance Publique, Hopitaux de Paris, Paris, France.
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Bary M, David F, Gasnault J, Kerneis H, Linard F, Longuet P, Pelissolo A, Ravaux I. Troubles neuropsychiatriques chez les patients infectés par le VIH et rôle de l'efavirenz. Med Mal Infect 2004; 34:435-49. [PMID: 15747468 DOI: 10.1016/j.medmal.2004.04.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [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: 11/20/2022]
Abstract
Efavirenz has now become commonly used to treat HIV infection. Neuropsychiatric disorders have been reported in patients treated with efavirenz. Several factors often make it hard to determine the cause of these disorders: HIV infected patients take many different drugs, they may suffer from various organ diseases, and may also be heavily affected by problems in their everyday life. The French experts group working on neuropsychiatric side effects of efavirenz has undertaken a review of these disorders with the aim to identify: (1) semiology, (2) epidemiology in the global population, in HIV infected patients, and in patients treated with efavirenz. The expert group suggests recommendations to manage these disorders.
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Affiliation(s)
- M Bary
- Centre du Moulin Joly, 5, rue du Moulin-Joly, 75011 Paris, France.
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Launay O, Roudière L, Boukli N, Dupont B, Prévoteau du Clary F, Patey O, David F, Lortholary O, Devidas A, Piketty C, Rey E, Urbinelli R, Allaert FA, Tréluyer JM, Caumes E. Assessment of cetirizine, an antihistamine, to prevent cutaneous reactions to nevirapine therapy: results of the viramune-zyrtec double-blind, placebo-controlled trial. Clin Infect Dis 2004; 38:e66-72. [PMID: 15095233 DOI: 10.1086/382677] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2003] [Accepted: 12/08/2003] [Indexed: 11/03/2022] Open
Abstract
We conducted a 12-week, multicenter, randomized, double-blind, placebo-controlled trial of cetirizine to assess the ability of antihistamines to prevent nevirapine-associated rash in patients infected with human immunodeficiency virus type 1. Patients initiating treatment with nevirapine were randomized to receive either cetirizine, 10 mg q.d. (104 patients), or placebo (96 patients) during the first 6 weeks of therapy. Rash occurred in 22 (11%) of 200 patients; 10 (9.6%) were in the cetirizine group and 12 (12.5%) were in the placebo group (odds ratio [OR], 0.75; 95% confidence interval [CI], 0.31-1.81; P=.5). Five of 22 rashes were cases of hypersensitivity syndrome. The rate of nevirapine discontinuation due to rash was similar in the 2 groups (7.7% and 6.25% in the cetirizine and placebo groups, respectively; P=.4). Multivariate analysis showed no treatment-group effect but indicated that age >40 years (OR, 3.83; 95% CI, 1.4-10.46; P=.008) was associated with an increased risk of rash. Cetirizine has no preventive effect on nevirapine-associated rash.
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Affiliation(s)
- O Launay
- Service de Medecine Interne, Hopital Cochin-Port Royal-Saint-Vincent de Paul, AP-HP, Paris, France.
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Dueck TA, Van Dijk CJ, David F, Scholz N, Vanwalleghem F. Chronic effects of vapour phase di-n-butyl phthalate (DBP) on six plant species. Chemosphere 2003; 53:911-920. [PMID: 14505713 DOI: 10.1016/s0045-6535(03)00580-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A fumigation experiment was performed in which six plant species representing the European flora were exposed to a range of DBP concentrations. Controlled amounts of DBP-saturated air were injected into the ingoing air-streams of plant fumigation chambers, maintaining constant concentrations there for a period of up to 76 days. The target concentrations were a control, 0.8, 1.5, 3.5, and 10.0 microg m(-3). The variation in sensitivity between plant species to atmospheric DBP was quantified on the basis of whole plant biomass in order to derive no-observed-effect-concentrations (NOECs). Significant dose-response relationships, based on realised concentrations, were thus derived using non-linear regression, resulting in NOECs of 0.51 microg m(-3) for Trifolium repens, 0.96 microg m(-3) for Brassica campestris, 1.87 microg m(-3) for Phaseolus vulgaris and 2.21 microg m(-3) for Plantago major. A significant effect was also observed for Holcus lanatus at 12.4 microg m(-3) DBP, but due to the variation at lower levels of DBP exposure, no dose-response relationship could be derived. No significant effect on growth of current year needles in Picea abies was observed, even at the highest level of DBP, 13.7 microg m(-3). Based on statistical extrapolation according to Aldenberg and Slob [Ecotox. Environ. Safety, 25 (1993) 48], an overall predicted no-effect concentration (PNEC) for the plant-atmosphere compartment of 0.33 microg m(-3) DBP was calculated. The PNEC was calculated using the mean and standard deviation of the NOEC for four of the tested species and an extrapolation factor. In addition to changes in leaf colour, leaf crinkling and growth reduction, a number of not quantified observations are described, indicating that DBP affects the physiology as well as the morphology of these species.
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Affiliation(s)
- Th A Dueck
- Plant Research International, P.O. Box 16, 6700 AA Wageningen, The Netherlands.
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