19 results on '"Ronsin, O."'
Search Results
2. Exenatide decreases liver fat content and epicardial adipose tissue in patients with obesity and type 2 diabetes: a prospective randomized clinical trial using magnetic resonance imaging and spectroscopy
- Author
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Dutour, A., Abdesselam, I., Ancel, P., Kober, F., Mrad, G., Darmon, P., Ronsin, O., Pradel, V., Lesavre, N., Martin, J. C., Jacquier, A., Lefur, Y., Bernard, M., and Gaborit, B.
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- 2016
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3. Ectopic fat storage in the pancreas using 1H-MRS: importance of diabetic status and modulation with bariatric surgery-induced weight loss
- Author
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Gaborit, B, Abdesselam, I, Kober, F, Jacquier, A, Ronsin, O, Emungania, O, Lesavre, N, Alessi, M-C, Martin, J C, Bernard, M, and Dutour, A
- Published
- 2015
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4. Ectopic fat storage in the pancreas using 1H-MRS: importance of diabetic status and modulation with bariatric surgeryinduced weight loss
- Author
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Gaborit, B, Abdesselam, I, Kober, F, Jacquier, A, Ronsin, O, Emungania, O, Lesavre, N, Alessi, M-C, Martin, J C, Bernard, M, and Dutour, A
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- 2015
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5. P308 Strategies for the screening of glucose tolerance abnormalities and diabetes in people with cystic fibrosis: a French position statement
- Author
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Weiss, L., Reix, P., Mosnier-Pudar, H., Ronsin, O., Beltrand, J., Reynaud, Q., Mely, L., Burgel, P.-R., Stremler, N., Rakotoarisoa, L., Galderisi, A., Perge, K., Bendelac, N., Abely, M., and Kessler, L.
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- 2023
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6. Glass-like dynamics of the strain-induced coil/helix transition on a permanent polymer network.
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Ronsin, O., Caroli, C., and Baumberger, T.
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POLYMERS , *GELATIN , *CHEMICAL relaxation , *COVALENT bonds , *ISOMERIZATION , *MOLECULAR dynamics - Abstract
We study the stress response to a step strain of covalently bonded gelatin gels in the temperature range where triple helix reversible crosslink formation is prohibited. We observe slow stress relaxation towards a T-dependent finite asymptotic level. We show that this is assignable to the strain-induced coil → helix transition, previously evidenced by Courty et al. [Proc. Natl. Acad. Sci. U. S. A. 102, 13457 (2005)], of a fraction of the polymer strands. Relaxation proceeds, in a first stage, according to a stretched exponential dynamics, then crosses over to a terminal simple exponential decay. The respective characteristic times TK and Tf exhibit an Arrhenius-like T-dependence with an associated energy E incompatibly larger than the activation barrier height for the isomerisation process which sets the clock for an elementary coil → helix transformation event. We tentatively assign this glass-like slowing down of the dynamics to the long-range couplings due to the mechanical noise generated by the local elementary events in this random elastic medium. [ABSTRACT FROM AUTHOR]
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- 2016
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7. Exenatide decreases liver fat content and epicardial adipose tissue in patients with obesity and type 2 diabetes: a prospective randomized clinical trial using magnetic resonance imaging and spectroscopy
- Author
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Martin , Jean-Charles, Dutour , M, Abdesselam , B, Ancel , M, Kober , B, Mrad , M., Darmon , M., Ronsin , M., Pradel , M., Lesavre , M, Martin , M., Jacquier , B., Lefur , B, Bernard , B, Gaborit , B., Dutour , A., Abdesselam , I., Ancel , P., Kober , F., Mrad , G., Darmon , P., Ronsin , O., Pradel , V., Lesavre , N., Jacquier , A., Lefur , Y., Bernard , M., Centre recherche en CardioVasculaire et Nutrition ( C2VN ), Institut National de la Recherche Agronomique ( INRA ) -Aix Marseille Université ( AMU ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies ( FEMTO-ST ), Université de Technologie de Belfort-Montbeliard ( UTBM ) -Ecole Nationale Supérieure de Mécanique et des Microtechniques ( ENSMM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Franche-Comté ( UFC ), Neuropsychopharmacologie, Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ), Laboratoire de génétique oncologique, Centre National de la Recherche Scientifique ( CNRS ), Technologies et systèmes d'information pour les agrosystèmes ( UR TSCF ), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture ( IRSTEA ), Environnement Ville Société ( EVS ), École normale supérieure - Lyon ( ENS Lyon ) -Université Lumière - Lyon 2 ( UL2 ) -Université Jean Moulin - Lyon III-Université Jean Monnet [Saint-Étienne] ( UJM ) -École Nationale des Travaux Publics de l'État ( ENTPE ) -Ecole Nationale Supérieure des Mines de Saint-Etienne-École nationale supérieure d'architecture de Lyon ( ENSAL ) -Centre National de la Recherche Scientifique ( CNRS ) -Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Université de Lyon-Institut National des Sciences Appliquées ( INSA ), Laboratoire de Physico-Chimie des Matériaux Luminescents ( LPCML ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Centre de résonance magnétique biologique et médicale ( CRMBM ), Aix Marseille Université ( AMU ) -Assistance Publique - Hôpitaux de Marseille ( APHM ) -Centre National de la Recherche Scientifique ( CNRS ), Nutrition, obésité et risque thrombotique ( NORT ), Service de Nutrition, Endocrinologie et Maladies Métaboliques, Hôpital Sainte Marguerite, Mécanique multi-échelles des solides faibles ( INSP-E7 ), Institut des Nanosciences de Paris ( INSP ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Hôpital Sainte-Marguerite [CHU - APHM] ( Hôpitaux Sud ), Techniques of Informatics and Microelectronics for integrated systems Architecture ( TIMA ), and Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut polytechnique de Grenoble - Grenoble Institute of Technology ( Grenoble INP ) -Institut National Polytechnique de Grenoble ( INPG ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA )
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endocrine system ,obesity ,hepatic triglyceride content ,education ,digestive, oral, and skin physiology ,[ SDV.MHEP.EM ] Life Sciences [q-bio]/Human health and pathology/Endocrinology and metabolism ,epicardial adipose tissue ,proton magnetic resonance spectroscopy ,glucagon-like peptide 1 receptor agonist ,magnetic resonance imaging ,pancreatic triglyceride content ,myocardial triglyceride content ,type 2 diabetes ,hormones, hormone substitutes, and hormone antagonists - Abstract
International audience; To conduct a prospective randomized trial to investigate the effect of glucagon-like peptide-1 (GLP-1) analogues on ectopic fat stores.
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- 2016
8. Two-step build-up of a thermoreversible polymer network: From early local to late collective dynamics.
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Souguir, H., Ronsin, O., Caroli, C., and Baumberger, T.
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THERMOREVERSIBLE gels , *POLYMER networks , *MODULUS of rigidity , *OPTICAL rotation , *NUCLEATION - Abstract
We probe the mechanisms at work in the build-up of thermoreversible gel networks, with the help of hybrid gelatin gels containing a controlled density of irreversible, covalent crosslinks (CLs), which we quench below the physical gelation temperature. The detailed analysis of the dependence on covalent crosslink density of both the shear modulus and optical activity evolutions with time after quench enables us to identify two stages of the physical gelation process, separated by a temperature-dependent crossover modulus: (i) an early nucleation regime during which rearrangements of the triple-helix CLs play a negligible role, and (ii) a late, logarithmic aging one, which is preserved, though slowed down, in the presence of irreversible CLs. We show that aging is fully controlled by rearrangements and discuss the implication of our results in terms of the switch from an early, local dynamics to a late, cooperative long-range one. [ABSTRACT FROM AUTHOR]
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- 2015
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9. Ectopic fat storage in the pancreas using 1H-MRS: importance of diabetic status and modulation with bariatric surgery-induced weight loss.
- Author
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Gaborit, B, Abdesselam, I, Kober, F, Jacquier, A, Ronsin, O, Emungania, O, Lesavre, N, Alessi, M-C, Martin, J C, Bernard, M, and Dutour, A
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ADIPOSE tissues ,BARIATRIC surgery ,WEIGHT loss ,PANCREATIC diseases ,PANCREATIC cancer ,PANCREATITIS ,TRIGLYCERIDES - Abstract
Objectives:Recent literature suggests that ectopic fat deposition in the pancreas may contribute to endocrine and exocrine organ dysfunction, such as type 2 diabetes (T2D), pancreatitis or pancreatic cancer. The aim of this study was to determine factors associated with pancreatic triglyceride content (PTGC), and to investigate the impact of bariatric surgery on ectopic fat pads, pancreatic fat (PTGC) and hepatic fat (HTGC).Subjects:In all, 45 subjects (13 lean, 13 obese nondiabetics and 19 T2D, matched for age and gender) underwent
1 H-magnetic resonance spectroscopy, computed tomography of the visceral abdominal fat, metabolic and lipidomic analysis, including insulin-resistance homeostasis model assessment (HOMA-IR), insulin-secretion homeostasis model assessment (HOMA-B) and plasma fatty-acid composition. Twenty obese subjects were reassessed 6 months after the bariatric surgery.Results:PTGC was significantly higher in type 2 diabetic subjects (23.8±3.2%) compared with obese (14.0±3.3; P=0.03) and lean subjects (7.5±0.9%; P=0.0002). PTGC remained significantly associated with T2D after adjusting for age and sex (β=0.47; P=0.004) or even after adjusting for waist circumference, triglycerides and HOMA-IR (β=0.32; P=0.04). T2D, C18:1n-9 (oleic acid), uric acid, triglycerides and plasminogen activator inhibitor-1 were the five more important parameters involved in PTGC prediction (explained 80% of PTGC variance). Bariatric surgery induced a huge reduction of both HTGC (−51.2±7.9%) and PTGC (−43.8±7.0%) reaching lean levels, whereas body mass index remained greatly elevated. An improvement of insulin resistance HOMA-IR and no change in HOMA-B were observed after bariatric surgery. The PTGC or HTGC losses were not correlated, suggesting tissue-specific mobilization of these ectopic fat stores.Conclusion:Pancreatic fat increased with T2D and drastically decreased after the bariatric surgery. This suggests that decreased PTGC may contribute to improved beta cell function seen after the bariatric surgery. Further, long-term interventional studies are warranted to examine this hypothesis and to determine the degree to which ectopic fat mobilization may mediate the improvement in endocrine and exocrine pancreatic functions. [ABSTRACT FROM AUTHOR]- Published
- 2015
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10. P180 Clinical practice versus guidelines for the screening of Cystic Fibrosis-Related Diabetes (CFRD): a French survey of 47 centres.
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Weiss, L., Ronsin, O., Reynaud, Q., Abely, M., Mely, L., Burgel, P.R., Beltrand, J., and Kessler, L.
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- 2022
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11. Environmental Nanoparticle-Induced Toughening and Pinning of a Growing Crack in a Biopolymer Hydrogel.
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Ronsin, O., Naassaoui, I., Marcellan, A., and Baumberger, T.
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DROPLETS , *ELECTROSTATIC interaction , *ADHESIVES , *COLLOIDS - Abstract
We study the interplay between a crack tip slowly propagating through a hydrogel and nanoparticles suspended in its liquid environment. Using a proteinic gel enables us to tune the electrostatic interaction between the network and silica colloids. Thereby, we unveil two distinct, local toughening mechanisms. The primary one is charge independent and involves the convective building of a thin particulate clog, hindering polymer hydration in the crack process zone. When particles and network bear opposite charges, transient adhesive bonding superimposes, permitting the remarkable pinning of a crack by a liquid drop. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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12. Screening strategies for glucose tolerance abnormalities and diabetes in people with cystic fibrosis.
- Author
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Weiss L, Reix P, Mosnier-Pudar H, Ronsin O, Beltrand J, Reynaud Q, Mely L, Burgel PR, Stremler N, Rakotoarisoa L, Galderisi A, Perge K, Bendelac N, Abely M, and Kessler L
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- Adult, Humans, Child, Glucose Tolerance Test, Comorbidity, Glucose, Blood Glucose, Cystic Fibrosis complications, Cystic Fibrosis diagnosis, Diabetes Mellitus diagnosis, Diabetes Mellitus epidemiology, Diabetes Mellitus drug therapy, Glucose Intolerance complications, Glucose Intolerance diagnosis, Glucose Intolerance epidemiology
- Abstract
The increase in life expectancy of patients with cystic fibrosis has come with new comorbidities, particularly diabetes. The gradual development of glucose tolerance abnormalities means that 30 to 40% of adults will be diabetic. Cystic fibrosis-related diabetes is a major challenge in the care of these patients because it is a morbidity and mortality factor at all stages of the disease. Early glucose tolerance abnormalities observed from childhood, before the stage of diabetes, are also associated with a poor pulmonary and nutritional outcome. The long asymptomatic period justifies systematic screening with an annual oral glucose tolerance test from the age of 10 years. However, this strategy does not take into account the new clinical profiles of patients with cystic fibrosis, recent pathophysiological knowledge of glucose tolerance abnormalities, and the emergence of new diagnostic tools in diabetology. In this paper, we summarise the challenges of screening in the current context of new patient profiles - patients who are pregnant, have transplants, or are being treated with fibrosis conductance transmembrane regulator modulators - and put forward an inventory of the various screening methods for cystic fibrosis-related diabetes, including their applications, limitations and practical implications., Competing Interests: Declaration of Competing Interest None., (Copyright © 2023 Elsevier Masson SAS. All rights reserved.)
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- 2023
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13. Syneresis of self-crowded calcium-alginate hydrogels as a self-driven athermal aging process.
- Author
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Da Silva Pinto B, Ronsin O, and Baumberger T
- Abstract
The assembly of biopolymers into a hydrated elastic network often goes along with syneresis , a spontaneous process during which the hydrogel slowly shrinks and releases solvent. The tendency to syneresis of calcium-alginate hydrogels, widely used biocompatible materials, is a hindrance to applications for which dimensional integrity is crucial. Although calcium-induced aggregation of specific block-sequences has been long known as the microscopic process at work in both primary cross-linking and syneresis, the nature of the coupling between these structural events and the global deswelling flow has remained so far elusive. We have tackled this issue within the regime of entangled pregels that yield highly cross-linked, self-crowded hydrogels with stiff networks. Using an original, stopped-flow extrusion experiment, we have unveiled a robust, stretched-exponential kinetics of shrinking, spanning more than six decades of time and quasi-independent of the alginate concentration. A careful analysis of the puzzling dynamical features of syneresis in these gels has led us to propose that due to the network rigidity, the calcium-fueled, random collapse events that drive solvent locally, are not thermally activated but rather controlled by the average poroelastic flow itself, according to a self-sustained mechanism described here for the first time.
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- 2023
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14. Clinical practice versus guidelines for the screening of cystic fibrosis-related diabetes: A French survey from the 47 centers.
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Weiss L, Ronsin O, Reynaud Q, Abely M, Mely L, Burgel PR, Beltrand J, and Kessler L
- Abstract
This study aimed to analyze clinical practices concerning cystic fibrosis-related diabetes (CFRD) screening in France. A web-based questionnaire was distributed between December 1, 2020 and January 31, 2021 among 47 cystic fibrosis centers including pediatric, adult, and mixed units. In accordance with guidelines, 92.8% of CF centers performed annual oral glucose tolerance tests (OGTT). Overall, 86.3% of CF centers performed 1- and 2-hour blood glucose determinations following OGTT. The OGTT was conducted before 10 years of age in 73% of pediatric centers. Continuous glucose monitoring (CGM) and laboratory glycated hemoglobin were employed for CFRD screening in 86.5% and 50% of centers, respectively. CGM was carried out in 69% of centers after glucose tolerance abnormalities had been detected in OGTT. Most CF centers used OGTT and CGM for CFRD screening. Studies are required to assess CGM usefulness as a validated tool in CFRD screening., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2022 The Author(s).)
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- 2022
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15. Nanostructured Dense Collagen-Polyester Composite Hydrogels as Amphiphilic Platforms for Drug Delivery.
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Wang X, Ronsin O, Gravez B, Farman N, Baumberger T, Jaisser F, Coradin T, and Hélary C
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- In Vitro Techniques, Collagen chemistry, Drug Delivery Systems methods, Hydrogels chemistry, Nanostructures chemistry, Polyesters chemistry, Spironolactone pharmacokinetics, Surface-Active Agents chemistry
- Abstract
Associating collagen with biodegradable hydrophobic polyesters constitutes a promising method for the design of medicated biomaterials. Current collagen-polyester composite hydrogels consisting of pre-formed polymeric particles encapsulated within a low concentrated collagen hydrogel suffer from poor physical properties and low drug loading. Herein, an amphiphilic composite platform associating dense collagen hydrogels and up to 50 wt% polyesters with different hydrophobicity and chain length is developed. An original method of fabrication is disclosed based on in situ nanoprecipitation of polyesters impregnated in a pre-formed 3D dense collagen network. Composites made of poly(lactic- co -glycolic acid) (PLGA) and poly(lactic acid) (PLA) but not polycaprolactone (PCL) exhibit improved mechanical properties compared to those of pure collagen dense hydrogels while keeping a high degree of hydration. Release kinetics of spironolactone, a lipophilic steroid used as a drug model, can be tuned over one month. No cytotoxicity of the composites is observed on fibroblasts and keratinocytes. Unlike the incorporation of pre-formed particles, the new process allows for both improved physical properties of collagen hydrogels and controlled drug delivery. The ease of fabrication, wide range of accessible compositions, and positive preliminary safety evaluations of these collagen-polyesters will favor their translation into clinics in wide areas such as drug delivery and tissue engineering., Competing Interests: The authors declare no conflict of interest., (© 2021 The Authors. Advanced Science published by Wiley‐VCH GmbH.)
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- 2021
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16. Core-Shell Pure Collagen Threads Extruded from Highly Concentrated Solutions Promote Colonization and Differentiation of C3H10T1/2 Cells.
- Author
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Picaut L, Trichet L, Hélary C, Ducourthial G, Bonnin MA, Haye B, Ronsin O, Schanne-Klein MC, Duprez D, Baumberger T, and Mosser G
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- Cell Differentiation, Tissue Engineering, Tissue Scaffolds, Collagen, Mesenchymal Stem Cells
- Abstract
The elaboration of scaffolds able to efficiently promote cell differentiation toward a given cell type remains challenging. Here, we engineered dense type I collagen threads with the aim of providing scaffolds with specific morphological and mechanical properties for C3H10T1/2 mesenchymal stem cells. Extrusion of pure collagen solutions at different concentrations (15, 30, and 60 mg/mL) in a PBS 5× buffer generated dense fibrillated collagen threads. For the two highest concentrations, threads displayed a core-shell structure with a marked fibril orientation of the outer layer along the longitudinal axis of the threads. Young's modulus and ultimate tensile stress as high as 1 and 0.3 MPa, respectively, were obtained for the most concentrated collagen threads without addition of any cross-linkers. C3H10T1/2 cells oriented themselves with a mean angle of 15-24° with respect to the longitudinal axis of the threads. Cells penetrated the 30 mg/mL scaffolds but remained on the surface of the 60 mg/mL ones. After three weeks of culture, cells displayed strong expression of the tendon differentiation marker Tnmd, especially for the 30 mg/mL threads. These results suggest that both the morphological and mechanical characteristics of collagen threads are key factors in promoting C3H10T1/2 differentiation into tenocytes, offering promising levers to optimize tissue engineering scaffolds for tendon regeneration.
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- 2021
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17. Glass-like stress relaxation of a permanent gelatin network as a signature of pretransitional helix-coil fluctuations.
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Caroli C, Ronsin O, and Lemaître A
- Abstract
The stress response of permanently crosslinked gelatin gels was recently observed to display glass-like features, namely, a stretched-exponential behavior terminated by an exponential decay, the characteristic time scales of which increase dramatically with decreasing temperature. This phenomenon is studied here using a model of flexible polymer gel network where relaxation proceeds via elementary monomer exchanges between helix and coil segments. The relaxation dynamics of a full network simulation is found to be nearly identical to that of a model of independent strands, which shows that for flexible polymer gels in the range of elastic moduli of interest, both strand contour length disorder and elastic couplings are irrelevant. We thus focus on the independent strand model and find it not only to explain the observed functional form of the stress relaxation curves but also to yield predictions that match very satisfactorily the experimental measurements of final relaxation time and total stress drop. The system under study thus constitutes a rare case where the origin of glass-like behavior can be unambiguously identified, namely, as the signature of the enhancement of helix content fluctuations when approaching from above the mean-field helix-coil transition of strands.
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- 2018
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18. Stabilization of foams by the combined effects of an insoluble gas species and gelation.
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Bey H, Wintzenrieth F, Ronsin O, Höhler R, and Cohen-Addad S
- Abstract
Liquid foams are unstable due to aging processes such as drainage, coalescence or coarsening. Since these processes modify the foam structure, they can be a severe limitation to the elaboration of solid foams with controlled structures inherited from their liquid precursors. Such applications call for a thorough understanding of foam stabilization. Here we study how coarsening can be inhibited by the combined effects of a mixture of gas containing a species insoluble in the foaming solution and of gelation of the foaming solution. We present experiments with model ordered liquid foams and hydrogel foams. They allow us to identify the underlying physical mechanisms of stabilization and their governing parameters, namely the bubble radius R
o , the foam shear modulus G and the number ηo of insoluble trapped gas molecules per bubble. We propose a scaling model that predicts the stability diagram of an ideal monodisperse perfectly ordered foam as a function of Ro , G and ηo , in qualitative agreement with our data. We show that the domain of stable foams is governed by a characteristic elasto-capillary radius set by the ratio of surface tension to storage modulus.- Published
- 2017
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19. The physics and chemistry of silica-in-silicates nanocomposite hydrogels and their phycocompatibility.
- Author
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Ahmed NB, Ronsin O, Mouton L, Sicard C, Yéprémian C, Baumberger T, Brayner R, and Coradin T
- Abstract
Silicates-in-silica nanocomposite hydrogels obtained from sodium silicates/colloidal silica mixtures have previously been found to be useful for bacterial encapsulation. However the extension of synthesis conditions and the understanding of their impact on the silica matrix would widen the applicability of this process in terms of encapsulated organisms and the host properties. Here the influence of silicates and the colloidal silica concentration as well as pH conditions on the gel time, the optical properties, the structural and mechanical properties of silica matrices was studied. We show that gel formation is driven by silicate condensation but that the aggregation of silica colloids also has a major influence on the transparency and structure of the nanocomposites. Three different photosynthetic organisms, cyanobacteria Anabaena flos-aquae and two microalgae Chorella vulgaris and Euglena gracilis, were used as probes of the phycocompatibility of the process. The three organisms were highly sensitive to the silicate concentration, which impacts both the gelation time and ionic strength conditions. The Ludox content was crucial for cyanobacteria as it strongly impacts the Young's modulus of the matrices. The detrimental effect of acidic pH on cell suspension was compensated by the silica network. Overall, it is now possible to select optimal encapsulation conditions based on the physiology of the targeted cells, opening wide perspectives for the design of biosensors and bioreactors.
- Published
- 2017
- Full Text
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