6 results on '"Hurel C"'
Search Results
2. Surface Reactivity of Anatase and Rutile Samples: Relationship with Toxicity on Aquatic Organisms
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Hurel, C., Jordan, N., Gerber, U., Weiß, S., Kubier, B., and Kleeberg, R.
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laser diffraction ,XRD ,TiO2 ,toxicity ,zetametry ,aquatic organisms - Abstract
The release of engineered titanium dioxide nanoparticles in the environment is nowadays continuously increasing due to their wide range of industrial applications. Their potential toxicity effects became of major concern and several assessment studies in natural waters were already undertaken. However, no consensus arised about the environmental factors influencing their hazardous impact, but rather contrary conclusions were drawn. In this study, the acute toxicity of commercial TiO2 nanoparticles suspensions at different concentrations on microcrustacean (Daphnia magna), marine rotifers (Brachionus plicatilis) and marine microalgae (Phaeodactylum tricornutum) under environmental conditions, in synthetic fresh and marine water, was investigated. Factors driving TiO2 adverse effects on aquatic environment, such as allotropic form, primary particle size, surface area, particle concentration and agglomerate size were studied. A thorough characterization of both surface and bulk properties of nano-sized TiO2 particles was therefore performed. Our results showed that Daphnia magna test is the most sensitive test for assessing toxicity of TiO2 samples on aquatic organisms. For anatase samples, toxicity towards aquatic organisms depends (i) on the primary particle size and the extent of agglomeration (mass median diameter d50), and consequently on surface reactivity (total surface site concentration, specific surface area, pHIEP) (ii) on the presence of rutile impurities in the sample. Toxicity results of rutile and anatase samples of comparable primary particle size (sub micrometric range) are of same order of magnitude and remained less toxic than nanometric particles. Rutile agglomeration was found to be higher than anatase agglomeration, toxicity results obtained for rutile could be attribute to the shape of particles, or it could be due to the presence of BaTiO3 impurities. This work emphasized the importance of studying the effects of different bulk and surface parameters of engineered TiO2 nanoparticles to understand their reactivity towards micro-organisms under environmental conditions.
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- 2022
3. FORUM DU SERVICE SANITAIRE DES ETUDIANTS EN SANTE : SIMULATION ET EMULATION !
- Author
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CHAPRON, A, primary, SCHEER, J, additional, ANDRES, E, additional, PRESTEL, T, additional, RENAUT, P, additional, HUREL, C, additional, RIDARD, E, additional, and GARLANTEZEC, R, additional
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- 2022
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4. Transverse Venous Sinus Stenosis in Patients With Nasal Cerebrospinal Fluid Leak and Idiopathic Intracranial Hypertension.
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Hurel C, Favier V, de Bonnecaze G, de Gabory L, Patsoura S, Molinier-Blossier S, Carrière M, Daubé P, Dufour X, Fieux M, and Carsuzaa F
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- Humans, Retrospective Studies, Case-Control Studies, Constriction, Pathologic, Cerebrospinal Fluid Leak surgery, Pseudotumor Cerebri complications, Pseudotumor Cerebri diagnostic imaging, Intracranial Hypertension surgery
- Abstract
Objective: Spontaneous nasal cerebrospinal fluid (CSF) leaks are frequently linked to idiopathic intracranial hypertension (IIH). The objectives of our study were: (1) to determine the rate of transverse venous sinus stenosis (TVSS) in patients with spontaneous nasal CSF leak and in patients with IIH without CSF (controls), and (2) to study the correlation between spontaneous nasal CSF leak and brain imaging features., Study Design: A multicenter retrospective case-control study., Setting: Six French tertiary hospitals., Methods: Patients with spontaneous nasal CSF leaks and patients with IIH without nasal CSF leaks (controls) were included. The transverse venous sinus patency was analyzed by magnetic resonance imaging to identify possible stenosis or hypoplasia., Results: Thirty-two patients with spontaneous nasal CSF leaks and 32 controls were included. TVSS was significantly more frequent in patients with spontaneous nasal CSF leaks than in controls (p = .029). Univariate analysis indicated that TVSS (odds ratio, OR: 4.2; 95% confidence interval, CI [1.352-14.915]; p = .017) and arachnoid granulations (OR: 3; 95% CI [1.065-8.994]; p = .042) were risk factors for spontaneous nasal CSF leak. In multivariate analysis, TVSS and arachnoid granulations were independent risk factors of nasal CSF leak (OR: 5.577, 95% CI [1.485-25.837], p = .016; and OR: 4.35, 95% CI [1.234-17.756], p = .029, respectively)., Conclusion: This multicenter case-control study shows that TVSS is an independent risk factor for CSF leak in patients with IIH. Stenosis management by interventional radiology may be proposed postoperatively to increase the success of IIH surgical treatment or preoperatively to reduce the need for surgery., (© 2023 American Academy of Otolaryngology-Head and Neck Surgery Foundation.)
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- 2023
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5. Life satisfaction in the context of the COVID-19 pandemic among middle school adolescents in France: findings from a repeated cross-sectional survey (EnCLASS, 2012-2021).
- Author
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Hurel C, Ehlinger V, Molcho M, Cohen JF, Falissard B, Sentenac M, and Godeau E
- Abstract
Background and Aims: Since the COVID-19 pandemic, several studies have reported a decrease in adolescents' well-being. We aim to describe life satisfaction over the last decade and examine the factors associated with its variations between 2020 and 2021 among French students in their last year of middle school (around 14-15 years old)., Methods: Data were drawn from a repeated biennial cross-sectional national survey conducted in French schools over the last decade (EnCLASS study), using a self-administered questionnaire. After describing life satisfaction trends between 2012 and 2021 using the Cantril ladder, we examined individual changes in life satisfaction between 2020 and 2021 and their associations with housing and studying conditions during the COVID-19 lockdown, using multinomial logistic regression analysis (decrease, increase, no change as reference)., Results: Among the 17,686 survey respondents, an overall slight decrease in the prevalence of adolescents reporting high life satisfaction (i.e., Cantril score ≥6) was observed since 2012 with the lowest proportion reported in 2021 (77.4%). Between 2020 and 2021, 16.3% of French adolescents experienced an improvement in life satisfaction, while 17.7% experienced the opposite. Decrease in life satisfaction between 2020 and 2021 was more likely experienced by adolescents living in reconstructed families [aOR 2.09 (95%CI, 1.58-2.77)], those who did not have their own room [aOR 1.58 (1.16-2.15)], nor access to the Internet to interact with their friends during the lockdown [aOR 1.47 (1.09-1.98)]. Interestingly, more girls than boys were represented in both those reporting increase and decrease in life satisfaction [aOR 1.82 (1.40-2.37) and 1.43 (1.14-1.79), respectively]., Conclusions: This study shows that the way adolescents experienced the first 2020 lockdown in France was not uniform, and that one must consider sex as well as housing and studying conditions when interpreting adolescents' life satisfaction decrease during the COVID-19 pandemic., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (© 2023 Hurel, Ehlinger, Molcho, Cohen, Falissard, Sentenac and Godeau.)
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- 2023
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6. Impact of HPV status in T1-2 oropharyngeal squamous cell carcinoma with bulky N3 nodes: a multicenter GETTEC study.
- Author
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Hurel C, Carsuzaa F, Salleron J, Gorphe P, Righini C, Rogé M, de Mones E, Morinière S, Vergez S, Thariat J, and Dufour X
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- Humans, Squamous Cell Carcinoma of Head and Neck complications, Prognosis, Retrospective Studies, Papillomaviridae, Oropharyngeal Neoplasms pathology, Papillomavirus Infections, Head and Neck Neoplasms complications
- Abstract
Purpose: The purpose of our study was to investigate the impact of HPV status in oncologic outcomes in patients with T1-2 oropharyngeal SCC associated with bulky N3 nodes, and to determine progression prognosis factors aiming to define the best therapeutic strategies for these patients., Methods: This multicenter retrospective study included patients with T1-2 oropharyngeal SCC with N3 nodes treated between 2010 and 2015 in 8 French comprehensive cancer centers. HPV status was determined with P16 hyperexpression in immunohistochemistry. HPV-positive patients were separated into 2 groups according to the associated smoking history (HPV + T +) or not (HPV + T-). We compared the oncological outcomes of patients according to HPV-status and smoking history., Results: Of 67 patients with T1-2 N3 oropharyngeal SCC, 36 patients (53.7%) were HPV negative and 31 patients (46.3%) HPV positive. 2-year PFS was significantly better in HPV + T- group (p = 0.036). The risk of death or progression was significantly reduced in HPV + T- comparatively to HPV- (HR 0.25 95%CI [0.07; 0.89]). 2-year OS was significantly better in HPV + T- group than in the other two groups (p = 0.017)., Conclusion: In patients with T1-2 oropharyngeal SCC associated with bulky N3 nodes, HPV positive patients without smoking history had better OS and PFS than HPV positive patients with smoking history and HPV negative patients. Thus, HPV status is a significant prognostic factor for survival but this benefit is altered when smoking history is associated. N3 HPV positive patients with smoking history have to be classified as high-risk., (© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
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- 2023
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