17 results on '"Chaperon M"'
Search Results
2. On generating families
- Author
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Chaperon, M., Bass, H., editor, Oesterlé, J., editor, Weinstein, A., editor, Hofer, Helmut, editor, Taubes, Clifford H., editor, Weinstein, Alan, editor, and Zehnder, Eduard, editor
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- 1995
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3. Compact multifunctional source-meter system for characterisation of laboratory-scale solar cell devices
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Corazza, M., Garcia-Valverde, R., Dam, H.F., Madsen, M.V., Hosel, M., Benatto, G.A.D.R., Beliatis, M.J., Pastorelli, F., Veenstra, S.C., Knelissen, G., Galagan, Y.O., Roesch, R., Faber, T., Hoppe, H., Berson, S., Manceau, M., Chaperon, M., Castro, F., Blakesley, J., Gevorgyan, S.A., Corazza, M., Garcia-Valverde, R., Dam, H.F., Madsen, M.V., Hosel, M., Benatto, G.A.D.R., Beliatis, M.J., Pastorelli, F., Veenstra, S.C., Knelissen, G., Galagan, Y.O., Roesch, R., Faber, T., Hoppe, H., Berson, S., Manceau, M., Chaperon, M., Castro, F., Blakesley, J., and Gevorgyan, S.A.
- Abstract
This article presents an innovative and low-cost solution for optimizing the acquisition of performance data of small-laboratory-scale photovoltaic devices. A novel measuring setup is proposed, designed based on an Arduino microcontroller and low-cost components, coupled with open source hardware and software. The manuscript describes in detail the instrument design, components and assembly enabling the reproduction and customization of the instrument for any reader. The setup is combined with an optional web-platform, which enables fast analysis and comparison of the collected data. For the demonstration of the instrument in operation, comparison of measurements of solar cell with the developed setup and commercial products has been conducted. It is shown that the presented prototype provides values of accuracy and precision during I-V curve recording, comparable with the values measured using a commercial source-meter (Keithley 2400). The study also discusses the unique advantages of easy transport and data collection by the setup and the drawbacks in the hardware, which have been observed during a round robin study. © 2019 IOP Publishing Ltd.
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- 2019
4. Polymorphisme du gène BTNL2 et uvéite sarcoïdosique
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Chaperon, M., primary, Pachéco, Y., additional, Maucort-Boulch, D., additional, Perard, L., additional, Broussolle, C., additional, Jamilloux, Y., additional, Burillon, C., additional, Kodjikian, L., additional, Calender, A., additional, and Sève, P., additional
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- 2017
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5. My Life with Augustin
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Chaperon, M.
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37D10 ,34C20 ,37C20 ,01A80 ,37G15 ,37G05 ,37J10 ,37J55 ,37C15 ,catastrophes ,53D35 ,34C23 ,34C45 ,37G10 ,bifurcations, catastrophes ,Contact or symplectic geometry, dynamical systems, bifurcations, catastrophes ,dynamical systems, bifurcations, catastrophes - Abstract
This is a very brief and partial account of Augustin's mathematics and our common interests. In the end is presented some recent work of mine whose birth he encouraged.
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- 2012
6. Some results on stable manifolds
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Chaperon, M.
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- 2001
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7. On a result of Eliashberg and Gromov
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Chaperon, M.
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- 2001
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8. Sur la thermodynamique des phénomènes chimiques
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Helmholtz, N., primary and Chaperon, M., additional
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- 1884
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9. La tétralocline dans les infections O. R. L.
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Chaperon, M., primary and Maspetiol, R., additional
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- 1971
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10. INTEREST OF REGULAR ASSAYS OF AQUEOUS HUMOR INTERLEUKIN-10 LEVELS IN MONITORING OF VITREORETINAL LYMPHOMA.
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Metayer C, Kodjikian L, Nguyen AM, Loria O, Chaperon M, Ghesquieres H, and Mathis T
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- Humans, Female, Male, Retrospective Studies, Aged, Middle Aged, Intraocular Lymphoma metabolism, Intraocular Lymphoma drug therapy, Intraocular Lymphoma diagnosis, Follow-Up Studies, Biomarkers, Tumor metabolism, Aged, 80 and over, Adult, Aqueous Humor metabolism, Interleukin-10 metabolism, Retinal Neoplasms metabolism, Retinal Neoplasms diagnosis, Retinal Neoplasms drug therapy, Vitreous Body metabolism, Vitreous Body pathology
- Abstract
Purpose: To investigate the variation of interleukin-10 (IL-10) levels in the aqueous humor (AH) of patients with vitreoretinal lymphoma (VRL) throughout therapy and follow-up and analyze the relation of these variations with VRL clinical course and relapse., Methods: This study retrospectively included consecutive patients diagnosed with VRL in a single center. AH IL-10 samples and patient clinical course were evaluated. The response to treatment was evaluated according to the criteria set by the International Primary Central Nervous System Lymphoma Collaborative Group., Results: A total of 59 eyes of 34 patients were included. Interleukin-10 levels decreased significantly at first AH sample after therapy induction (median [IQR] 3.0 [2.8-3.6] months) among patients in complete clinical remission (P < 0.001). Among patients in complete clinical remission with residual detectable IL-10 in AH after therapy induction (85.3% systemic chemotherapy, 11.8% intravitreal methotrexate, 2.9% palliative care), 87.5% experienced ocular relapse within 5 years. The detection of IL-10 in AH at the first visit after induction for complete clinical remission obtained a sensitivity of 77.8% (95% CI 0.45-0.96) and a specificity of 96.4% (95% CI 0.82-0.99) to predict ocular relapse. For relapsing eyes (N = 26), IL-10 significantly increased between the last IL-10 measurement and the time of the first ocular relapse (P < 0.001). In 76.0% of cases, an increase in IL-10 was detected earlier than clinical relapse with a mean (SD) of 4.0 (2.4) months., Conclusion: The present study suggested the usefulness of IL-10 in the prognosis of VRL. This study showed a relation between IL-10 in AH and tumoral activity, and for the first time with disease relapse.
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- 2024
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11. Correction: Long-term real-life outcomes of the Clareon® hydrophobic intraocular lens: the Clarte study in 191 eyes : 3-years real-life outcomes of the Clareon® intraocular lens.
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Bouvarel H, Agard E, Billant J, Levron A, Chudzinski R, Plas H, Bernier R, Sejournet L, Chaperon M, and Dot C
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- 2024
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12. Long-term real-life outcomes of the Clareon® hydrophobic intraocular lens: the Clarte study in 191 eyes : 3-years real-life outcomes of the Clareon® intraocular lens.
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Bouvarel H, Agard E, Billant J, Levron A, Chudzinski R, Plas H, Bernier R, Sejournet L, Chaperon M, and Dot C
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- Humans, Lens Implantation, Intraocular, Retrospective Studies, Visual Acuity, Refraction, Ocular, Prosthesis Design, Lenses, Intraocular, Cataract Extraction, Capsule Opacification, Phacoemulsification
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Background: To describe and analyze the real-life refractive, functional and safety outcomes of the Clareon® intraocular lens (IOL) after 3 years., Methods: Data was collected retrospectively for observational purposes between July 2017 and December 2019 in the ophthalmology department of Desgenettes military hospital in Lyon, France. Eyes that underwent cataract surgery with Claeron® implantation were consecutively included. Patients with a systemic or ocular condition that could affect the visual outcome were excluded. Postoperative corrected (CDVA) and uncorrected (UDVA) distance visual acuities as well as capsule and IOL transparency were assessed at 1 month and 3 years., Results: A total of 326 eyes were analyzed at one month and 191 eyes were reassessed at the 3-year follow-up visit. At 3 years, the mean CDVA was 0.003 LogMAR (95% confidence interval [CI]: -0.003 to -0.01) and the mean UDVA was 0.075 (95% CI: 0.054 to 0.095). Three quarters of the patients had an UDVA ≥ 0.097 logMAR (20/25 Snellen equivalent) and 50% had an UDVA ≥ 0 (20/20). The absence of glistening was reported in 95.3% of cases and 4.7% [9] of patients experienced a clinically significant posterior capsular opacification (PCO) for which Nd:YAG treatment was required., Conclusions: This real-life study reports high-performance and stable long-term refractive outcomes of the Clareon® IOL with good safety in terms of PCO and glistening., (© 2024. The Author(s).)
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- 2024
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13. Focal Photocoagulation as an Adjunctive Therapy to Reduce the Burden of Intravitreal Injections in Macula Edema Patients, the LyoMAC2 Study.
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Séjournet L, Kodjikian L, Elbany S, Allignet B, Agard E, Chaperon M, Billant J, Denis P, Mathis T, Burillon C, and Dot C
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Aim: To assess the efficacy of focal photocoagulation of capillary macroaneurysms (CMA) to reduce the burden of intravitreal injections (IVI) in patients with macular edema (ME)., Materials and Methods: Retrospective multicenter study in patients with diabetic ME or ME secondary to retinal vein occlusion (ME-RVO). CMA associated with ME were selectively photocoagulated. Patients were followed for one year after photocoagulation., Results: 93 eyes of 76 patients were included in this study. At 6 months after the laser (n = 93), there was a significant decrease in mean macular thickness (from 354 µm to 314 µm, p < 0.001) and in mean IVI number (from 2.52 to 1.52 at 6 months, p < 0.001). The mean BCVA remained stable (0.32 and 0.31 logMAR at baseline and 6 months, p = 0.95). At 12 months (n = 81/93), there was a significant decrease in mean macular thickness (from 354 µm to 314 µm, p < 0.001) and in mean IVI number (from 4.44 to 2.95 at 12 months, p < 0.001), while the mean BCVA remained stable (0.32 and 0.30 logMAR at baseline and 12 months, p = 0.16)., Conclusion: Focal laser photocoagulation of CMA seems to be effective and safe for reducing the burden of IVI in patients with ME. Their screening during the follow-up should be considered closely.
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- 2023
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14. Relevance of Visual Acuity Measurement for Therapeutic Decisions in Age-Related Macular Degeneration.
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Mathis T, El Ameen B, Chaperon M, Serrar Y, Devin F, Dziadzko M, Rezkallah A, and Kodjikian L
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The aim of this study is to assess if the decision to retreat could be determined by anatomical criteria (mostly driven by optical coherence tomography (OCT)-guided strategy) rather than the gold standard (visual acuity (VA) and OCT) in patients with neovascular age-related macular degeneration (nAMD). A cross-sectional study of 142 eyes already treated for nAMD from September 2021 to December 2021 was performed. At inclusion, a first therapeutic decision was made based on the analysis of the OCT. This decision was then maintained or modified after being made aware of the patient's VA. Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) were calculated. The OCT-guided strategy matched the gold standard for treatment decisions in 131 of the 142 eyes included (92.3%). The sensitivity and specificity of the OCT-guided strategy for the retreatment decision were 94.0% and 89.8%, respectively. PPV and NPV were 92.9% and 91.4%, respectively. Considering the treatment regimen, eyes followed under the Pro ReNata regimen showed better sensitivity (100%) and specificity (93.3%) than eyes followed under the treat and extend regimen (93.5% and 88.6%, respectively). Based on the findings of this study, the follow-up for selected patients with nAMD under anti-VEGF treatment could be monitored without regular VA testing with acceptable performance.
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- 2023
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15. Screening of telangiectatic capillaries in chronic macular edema based on multimodal imaging: a study of 101 eyes. LyoMAC1 study.
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Chaperon M, Kodjikian L, Agard E, Mathis T, Billant J, El-Chehab H, Pradat P, and Dot C
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- Capillaries, Cohort Studies, Fluorescein Angiography methods, Humans, Prospective Studies, Retrospective Studies, Tomography, Optical Coherence methods, Visual Acuity, Diabetic Retinopathy complications, Macular Edema complications, Macular Edema etiology, Retinal Vein Occlusion diagnosis
- Abstract
Purpose: To estimate the prevalence of telangiectatic capillaries (TCs) in patients followed for chronic macular edema (CME) (diabetic ME [DME] and ME associated with retinal vein occlusion [RVO])., Methods: Real-life, prospective, bi-centric cohort study including all consecutive patients followed for a clinically significant CME secondary to diabetic retinopathy or RVO. Inclusion criteria were patients treated with intravitreal injection for their ME for at least 12 months who had to undergo follow-up angiography. Multimodal imaging with color retinophotography, spectral-domain optical coherence tomography (SD-OCT), OCT angiography, and en face OCT was performed in all patients., Results: A total of 101 eyes of 71 patients were included between November 2019 and June 2020. Of the 101 eyes analyzed, indocyanine green angiography found at least one TC in 67 eyes (66.3%). No significant differences were found between the groups with and without TC except for the distribution of DME and RVO (p < 0.008). In 83.6% of eyes with TCs, TCs contributed to the formation of the ME. SD-OCT sensitivity for TC detection was 94%., Conclusion: In our study, the estimated prevalence of TCs in CME (DME and ME associated with RVO) was 66.3%, i.e., two-thirds of patients. SD-OCT was an excellent screening examination with a sensitivity of 94%., (© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
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- 2022
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16. A prospective multicentre study of intravitreal injections and ocular surface in 219 patients: IVIS study.
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Verrecchia S, Chiambaretta F, Kodjikian L, Nakouri Y, El Chehab H, Mathis T, Badri Y, Chudzinski R, Levron A, Chaperon M, Agard E, Pradat P, and Dot C
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- Adult, Aged, Aged, 80 and over, Angiogenesis Inhibitors administration & dosage, Conjunctiva diagnostic imaging, Female, Follow-Up Studies, Humans, Male, Meibomian Glands diagnostic imaging, Meibomian Glands metabolism, Middle Aged, Prospective Studies, Surveys and Questionnaires, Tears metabolism, Angiogenesis Inhibitors adverse effects, Conjunctiva drug effects, Intravitreal Injections methods, Meibomian Glands drug effects, Quality of Life, Retinal Diseases drug therapy
- Abstract
Purpose: To assess the impact of intravitreal injections (IVTI) on ocular surface of patients treated with multiple injections., Methods: Prospective, tricentric study conducted in patients treated with unilateral IVTI. An asepsis protocol with povidone-iodine was used for all patients during IVTI. The primary endpoint was the difference between the pre-IVTI Ocular Surface Disease Index (OSDI 1) score and that measured on day one (D1) post-IVTI (OSDI 2). Secondary endpoints were the evaluation of predictive factors for OSDI scores, pain assessment on D1, and the Lacrydiag® analysis of tears from the injected eye versus contralateral eye before IVTI., Results: Two hundred and nineteen patients with a mean age of 75.9 ± 10 years were included. The mean OSDI2-OSDI1 difference was 19.2 ± 20.6 (p < 0.001). The mean noninvasive tear break-up time was 6.41 ± 4.59 seconds in the injected eye versus 7.36 ± 4.36 seconds in the contralateral eye (p < 0.001). In the multivariate analysis, the factors significantly associated with the OSDI 2 score were the OSDI 1 score (p < 0.001), the pain score on D1 (p < 0.001) the number of instilled glaucoma eye drop (p = 0.01) and a centre effect (centres 2 and 3 versus centre 1, p < 0.001)., Conclusion: Our results confirm the impairment of the ocular surface and quality of life immediately after an IVTI. These results suggest 3 levels of action to improve the immediate tolerance: improving the basal status of the ocular surface, reducing the contact time with povidone-iodine that might be toxic to the surface, and improving immediate post-IVTI treatment., (© 2021 Acta Ophthalmologica Scandinavica Foundation. Published by John Wiley & Sons Ltd.)
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- 2021
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17. BTNL2 gene polymorphism and sarcoid uveitis.
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Chaperon M, Pacheco Y, Maucort-Boulch D, Iwaz J, Perard L, Broussolle C, Jamilloux Y, Burillon C, Kodjikian L, Calender A, and Seve P
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- Adult, Case-Control Studies, DNA Primers chemistry, Female, Genotype, Humans, Male, Middle Aged, Polymerase Chain Reaction, Risk Factors, Sarcoidosis diagnosis, Uveitis diagnosis, Butyrophilins genetics, Polymorphism, Single Nucleotide, Sarcoidosis genetics, Uveitis genetics
- Abstract
Background: Uveitis is a frequent and early feature of sarcoidosis. As BTNL2 (butyrophilin-like 2) gene polymorphism was found linked with the susceptibility to sarcoidosis, we investigated whether a specific genotype of BTNL2 gene G16071A (or rs2076530) single-nucleotide polymorphism (SNP) would be associated with the risk of sarcoid uveitis in all patient subgroups., Methods: The study compared the genotype frequencies of SNP G16071A of 135 patients with sarcoid uveitis (Sa
+ Uv+ ) with those of 196 patients with sarcoidosis without uveitis (Sa+ Uv- ), 81 patients with uveitis without sarcoidosis (Sa- Uv+ ), and 271 controls with no sarcoidosis nor uveitis (Sa- Uv- ). Three hypothetical subgroups of patients with sarcoid uveitis (Sa+ Uv+ cases) were considered: (1) subgroup I: patients aged <45 years of both sexes and all ethnic origins; (2) subgroup II: Caucasian women aged >45 years; and (3) subgroup III: all other patients., Results: A statistically significant difference in genotype frequencies was found between the groups Sa+ Uv- and Sa- Uv- (p=3.2×10-6 ) and between the groups Sa+ Uv+ and Sa+ Uv- (p=7.1×10-3 ). There was no difference between the three subgroups of Sa+ Uv+ patients. There was a statistically significant difference in genotype frequencies between Sa+ Uv- and Sa+ Uv+ subgroup II (p=0.005) but no difference between Sa+ Uv- and Sa+ Uv+ subgroup I., Conclusion: No association was found between G16071A and the susceptibility to sarcoid uveitis. BTNL2 gene G16071A SNP seems to be a predisposing factor for sarcoidosis except in Caucasian postmenopausal women with sarcoid uveitis in whom the GG genotype prevails. These and future results will help in understanding differences between particular subgroups of patients with sarcoid uveitis., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2019. No commercial re-use. See rights and permissions. Published by BMJ.)- Published
- 2019
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