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Weiss P, Westbrook A, Weiss J, Gulliver J, Biesboer D. Effect of water velocity on hydroponic phytoremediation of metals. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2014; 16:203-217. [PMID: 24912210 DOI: 10.1080/15226514.2013.773274] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The influence of flow velocity on the uptake of cadmium, copper, lead, and zinc by hydroponically grown soft stem bulrush (Scirpus validus) was investigated. The roots of the plants were exposed to a continually recycled, nutrient enriched, synthetic stormwater. Plants were divided into groups and the roots of each group exposed to different but constant water velocities. The metal concentrations in the roots and stems were compared after three weeks. Metal accumulation in roots was increased for water velocities between 1.3 and 4.0 cm s(-1). In a second experiment, the roots of all plants were exposed to a single velocity and the root and stem metal concentrations were determined as a function of time. Metal concentrations in the roots approached a constant value after three weeks. After this time, accumulation of metals depends upon root growth. The results suggest that long-term accumulation by the roots of hydroponic Scirpus validus can be increased by increasing water velocity, which implies that floating islands with movement will retain more metals from the water column.
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Corre P, Merceron C, Vignes C, Sourice S, Masson M, Durand N, Espitalier F, Pilet P, Cordonnier T, Mercier J, Remy S, Anegon I, Weiss P, Guicheux J. Determining a clinically relevant strategy for bone tissue engineering: an "all-in-one" study in nude mice. PLoS One 2013; 8:e81599. [PMID: 24349093 PMCID: PMC3862877 DOI: 10.1371/journal.pone.0081599] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Accepted: 10/15/2013] [Indexed: 11/20/2022] Open
Abstract
Purpose Autologous bone grafting (BG) remains the standard reconstruction strategy for large craniofacial defects. Calcium phosphate (CaP) biomaterials, such as biphasic calcium phosphate (BCP), do not yield consistent results when used alone and must then be combined with cells through bone tissue engineering (BTE). In this context, total bone marrow (TBM) and bone marrow-derived mesenchymal stem cells (MSC) are the primary sources of cellular material used with biomaterials. However, several other BTE strategies exist, including the use of growth factors, various scaffolds, and MSC isolated from different tissues. Thus, clinicians might be unsure as to which method offers patients the most benefit. For this reason, the aim of this study was to compare eight clinically relevant BTE methods in an “all-in-one” study. Methods We used a transgenic rat strain expressing green fluorescent protein (GFP), from which BG, TBM, and MSC were harvested. Progenitor cells were then mixed with CaP materials and implanted subcutaneously into nude mice. After eight weeks, bone formation was evaluated by histology and scanning electron microscopy, and GFP-expressing cells were tracked with photon fluorescence microscopy. Results/Conclusions Bone formation was observed in only four groups. These included CaP materials mixed with BG or TBM, in which abundant de novo bone was formed, and BCP mixed with committed cells grown in two- and three-dimensions, which yielded limited bone formation. Fluorescence microscopy revealed that only the TBM and BG groups were positive for GFP expressing-cells, suggesting that these donor cells were still present in the host and contributed to the formation of bone. Since the TBM-based procedure does not require bone harvest or cell culture techniques, but provides abundant de novo bone formation, we recommend consideration of this strategy for clinical applications.
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Struillou X, Rakic M, Badran Z, Macquigneau L, Colombeix C, Pilet P, Verner C, Gauthier O, Weiss P, Soueidan A. The association of hydrogel and biphasic calcium phosphate in the treatment of dehiscence-type peri-implant defects: an experimental study in dogs. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2013; 24:2749-2760. [PMID: 23912791 DOI: 10.1007/s10856-013-5019-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 07/22/2013] [Indexed: 06/02/2023]
Abstract
Hydrogel polymers have many applications in regenerative medicine. The aim of this study in dogs was to investigate bone regeneration in dehiscence-type peri-implant defects created surgically and treated with (i) biphasic calcium phosphate (BCP) granules alone; (ii) a composite putty hydroxypropyl methylcellulose (HPMC)/BCP (MBCP/putty); and (iii) a polymer crosslinked membrane of silanized-HPMC (Si-HPMC/BCP) compared with empty controls. At 3 months, new bone formation was significantly more important in defects filled with HPMC/BCP or Si-HPMC/BCP compared with spontaneous healing in control (P = 0.032 and P = 0.046 respectively) and more substantial compared with BCP alone. Furthermore, new bone formation in direct contact with the implant surface was observed in all three groups treated with BCP. The addition of HPMC to the BCP granules may have enhanced the initial stability of the material within the blood clot in these large and complex osseous defects. The Si-HPMC hydrogel may also act as an occlusive membrane covering the BCP, which could improve the stability of the granules in the defect area. However, the crosslinking time of the Si-HPMC is too long for easy handling and the mechanical properties remain to be improved. The composite MBCP/putty appears to be a valuable bone-graft material in complex defects in periodontology and implantology. These encouraging results should now be confirmed in clinical studies.
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Wilson D, Aragonez R, Archuleta T, Atkinson D, Barrios M, Batha S, Bower D, Bradley D, Buckles R, Clark D, Clark D, Clark D, Cradick J, Danly C, Day R, Dzenitis J, Drury O, Fatherley V, Felker B, Finch J, Fittinghoff D, Frank M, Gallegos R, Garcia F, Glenn S, Grim G, Guler N, Hsu A, Izumi N, Jaramillo S, Jones O, Kaufman M, Kilkenny J, Kyrala G, Pape SL, Liddick S, Loomis E, Lutz S, Ma T, Mackinnon A, Malone R, Mares D, Marinak M, Martinson D, McKenty P, Meezan N, Merrill F, Moran M, Morgan G, Munson C, Munro D, Murphy T, Oertel J, Patel M, Polk P, Regan S, Roberson G, Schmidt D, Sepke S, Spears B, Tommasini R, Town R, Traille A, Tregillis I, Valdez A, Volegov P, Wang TS, Weiss P, Wilde C, Wilke M. Comparing neutron and X-ray images from NIF implosions. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20135904002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Castelot-Enkel B, Nguyen JM, Armengol V, Volteau C, Laboux O, Lombrail P, Weiss P. A recall program for the outcome of conventional root canal treatment performed in a teaching hospital. Acta Odontol Scand 2013; 71:1399-409. [PMID: 23387429 DOI: 10.3109/00016357.2013.765591] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVES This study investigated the long-term survival and the prognostic factors of endodontic treatments performed in a dental teaching hospital. The aim was to calculate the probabilities of success or failure according to the follow-up extent and to assess the time allowed for a complete periapical healing. MATERIALS AND METHODS A cohort of 185 teeth were re-examined 1-4 years after treatment. The outcome was assessed on the basis of radiographic and clinical criteria as success, uncertain or failure. A survival analysis using the Cox model was used (i) to explore tooth survival and periapical healing over the time and (ii) to highlight the predictive factors of treatment outcome. RESULTS After 2 years, the appearance of an apical periodontitis remained lower than 3.5%, whereas only 22.8% of periapical healed cases were notified. The prognosis factors are: (i) for teeth with initial healthy periapical conditions, coronal leakage (p = 0.002) with the higher risk of failure (RR = 19.77), absence of correspondence filling length/shaping = 0.026), type of teeth (p = 0.041) and (ii) for teeth with apical periodontitis, number of root canals (p = 0.000,91), correspondence filling length/shaping length (p = 0.017) and over-filling (p = 0.09). New periapical lesions or tooth loss were recorded after 2 years. Half of the successful cases of periapical healing were observed during the follow-up from 2-4 years. CONCLUSIONS This longitudinal study shows that coronal leakage is responsible for late failure and that periapical healing is long to achieve. Therefore, endodontic treatments may require a follow-up of over 2 years.
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Pereira J, Portron S, Dizier B, Vinatier C, Masson M, Sourice S, Galy-Fauroux I, Corre P, Weiss P, Fischer AM, Guicheux J, Helley D. The in vitro and in vivo effects of a low-molecular-weight fucoidan on the osteogenic capacity of human adipose-derived stromal cells. Tissue Eng Part A 2013; 20:275-84. [PMID: 24059447 DOI: 10.1089/ten.tea.2013.0028] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Human adipose-derived stromal cells (hASCs) may hold potential for bone tissue engineering. Osteogenic differentiation of these cells is crucial to bone formation. Low-molecular-weight fucoidan (LMWF) is a sulfated polysaccharide that potentiates several growth factors, including pro-angiogenic growth factors. To investigate whether hASC preconditioning with LMWF promoted bone repair, we compared the effects of LMWF and low-molecular-weight heparin on hASC phenotype and osteogenic differentiation. LMWF did not modify the stem-cell phenotype of hASCs but enhanced their osteogenic differentiation (formation of calcium deposits, increased activity and expression of alkaline phosphatase, and increased expression of osteopontin and runt-related transcription factor 2). However, when hASCs were exposed to LMWF before their adhesion to biphasic calcium phosphate particles and implantation in a bone-growth mouse model, no bone formation was apparent after 5 or 8 weeks, probably due to cell death. In conclusion, LMWF may hold promise for enhancing the osteogenic differentiation of hASCs before their implantation. However, concomitant vascularization would be required to enhance bone formation.
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Glanzman J, Weiss P, Mehta K, Mourad W, Bodner W, Yaparpalvi R, Kalnicki S, Garg M. Surgical Resection Followed by High-Dose-Rate Brachytherapy With Iridium-192 for Management of Keloids at High Risk for Recurrence. Int J Radiat Oncol Biol Phys 2013. [DOI: 10.1016/j.ijrobp.2013.06.1484] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Sohier J, Corre P, Perret C, Pilet P, Weiss P. Novel and simple alternative to create nanofibrillar matrices of interest for tissue engineering. Tissue Eng Part C Methods 2013; 20:285-96. [PMID: 23937338 DOI: 10.1089/ten.tec.2013.0147] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Synthetic analogs to natural extracellular matrix (ECM) at the nanometer level are of great potential for regenerative medicine. This study introduces a novel and simple method to produce polymer nanofibers and evaluates the properties of the resulting structures, as well as their suitability to support cells and their potential interest for bone and vascular applications. The devised approach diffracts a polymer solution by means of a spraying apparatus and of an airstream as sole driving force. The resulting nanofibers were produced in an effective fashion and a factorial design allowed isolating the processing parameters that control nanofiber size and distribution. The nanofibrillar matrices revealed to be of very high porosity and were effectively colonized by human bone marrow mesenchymal cells, while allowing ECM production and osteoblastic differentiation. In vivo, the matrices provided support for new bone formation and provided a good patency as small diameter vessel grafts.
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Buchtová N, Réthoré G, Boyer C, Guicheux J, Rambaud F, Vallé K, Belleville P, Sanchez C, Chauvet O, Weiss P, Le Bideau J. Nanocomposite hydrogels for cartilage tissue engineering: mesoporous silica nanofibers interlinked with siloxane derived polysaccharide. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2013; 24:1875-1884. [PMID: 23666665 DOI: 10.1007/s10856-013-4951-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Accepted: 04/30/2013] [Indexed: 06/02/2023]
Abstract
Injectable materials for mini-invasive surgery of cartilage are synthesized and thoroughly studied. The concept of these hybrid materials is based on providing high enough mechanical performances along with a good medium for chondrocytes proliferation. The unusual nanocomposite hydrogels presented herein are based on siloxane derived hydroxypropylmethylcellulose (Si-HPMC) interlinked with mesoporous silica nanofibers. The mandatory homogeneity of the nanocomposites is checked by fluorescent methods, which show that the silica nanofibres dispersion is realized down to nanometric scale, suggesting an efficient immobilization of the silica nanofibres onto the Si-HPMC scaffold. Such dispersion and immobilization are reached thanks to the chemical affinity between the hydrophilic silica nanofibers and the pendant silanolate groups of the Si-HPMC chains. Tuning the amount of nanocharges allows tuning the resulting mechanical features of these injectable biocompatible hybrid hydrogels. hASC stem cells and SW1353 chondrocytic cells viability is checked within the nanocomposite hydrogels up to 3 wt% of silica nanofibers.
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Bourgine A, Pilet P, Diouani S, Sourice S, Lesoeur J, Beck-Cormier S, Khoshniat S, Weiss P, Friedlander G, Guicheux J, Beck L. Mice with hypomorphic expression of the sodium-phosphate cotransporter PiT1/Slc20a1 have an unexpected normal bone mineralization. PLoS One 2013; 8:e65979. [PMID: 23785462 PMCID: PMC3681848 DOI: 10.1371/journal.pone.0065979] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Accepted: 05/03/2013] [Indexed: 11/18/2022] Open
Abstract
The formation of hydroxyapatite crystals and their insertion into collagen fibrils of the matrix are essential steps for bone mineralization. As phosphate is a main structural component of apatite crystals, its uptake by skeletal cells is critical and must be controlled by specialized membrane proteins. In mammals, in vitro studies have suggested that the high-affinity sodium-phosphate cotransporter PiT1 could play this role. In vivo, PiT1 expression was detected in hypertrophic chondrocytes of murine metatarsals, but its implication in bone physiology is not yet deciphered. As the complete deletion of PiT1 results in embryonic lethality at E12.5, we took advantage of a mouse model bearing two copies of PiT1 hypomorphic alleles to study the effect of a low expression of PiT1 on bone mineralization in vivo. In this report, we show that a 85% down-regulation of PiT1 in long bones resulted in a slight (6%) but significant reduction of femur length in young mice (15- and 30-day-old). However, despite a defect in alcian blue / alizarin red S and Von Kossa staining of hypomorphic 1-day-old mice, using X-rays micro-computed tomography, energy dispersive X-ray spectroscopy and histological staining techniques we could not detect differences between hypomorphic and wild-type mice of 15- to 300-days old. Interestingly, the expression of PiT2, the paralog of PiT1, was increased 2-fold in bone of PiT1 hypomorphic mice accounting for a normal phosphate uptake in mutant cells. Whether this may contribute to the absence of bone mineralization defects remains to be further deciphered.
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Liu W, Zhang J, Weiss P, Tancret F, Bouler JM. The influence of different cellulose ethers on both the handling and mechanical properties of calcium phosphate cements for bone substitution. Acta Biomater 2013. [PMID: 23201018 DOI: 10.1016/j.actbio.2012.11.020] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The influence of cellulose ether additives (CEAs) on the performance of final calcium phosphate cement (CPC) products is thoroughly investigated. Four CEAs were added into the liquid phase of apatitic CPCs based on the hydrolysis of α-tricalcium phosphate, to investigate the influence of both molecular weight and degree of substitution on the CPCs' properties, including handling (e.g. injectability, cohesion, washout resistance and setting time), microstructure (e.g. porosity and micromorphology) and mechanical properties (e.g. fracture toughness and compressive strength). The results showed that even a small amount of CEAs modified most of these CPCs' features, depending on the structural parameters of the CEAs. The CEAs dramatically improved the injectability, cohesion and washout resistance of the pastes, prolonged the final setting time and increased the porosity of CPCs. Moreover, the CEAs had an evident toughening effect on CPCs, and this effect become more significant with increasing molecular weight and mass fraction of CEAs, inducing a significant tolerance to damage. Overall, the molecular weight of CEAs played a major role compared to their degree of substitution in CPCs' performances.
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Glanzman J, Weiss P, Mehta K, Bodner W, Kalnicki S, Garg M. PO-0986: Surgical resection followed by HDR brachytherapy for management of keloids at high risk for recurrence. Radiother Oncol 2013. [DOI: 10.1016/s0167-8140(15)33292-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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113
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Schartner E, Höflmayer D, Müller-Knespel EM, Dzirlo L, Haunold I, Dawid M, Stanek-Kalchhauser D, Weiss P, Klimpfinger M. [First manifestation of a leucocytoclastic vasculitis in the colon: case report and differential diagnostic aspects]. ZEITSCHRIFT FUR GASTROENTEROLOGIE 2013; 51:37-42. [PMID: 23315650 DOI: 10.1055/s-0032-1325470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This report presents a female patient suffering from chronic diarrhea, who developed palpable purpura on the lower extremities 8 weeks after onset of the gastrointestinal symptoms. Biopsies obtained from the colon and skin showed leukocytoclastic vasculitis. Possible triggers or underlying diseases could not be found, and the patient recovered without specific treatment for vasculitis. Possible differential diagnoses and the difficulties in classifying vasculitides are discussed in the present report.
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Mathieu E, Lamirault G, Toquet C, Lhommet P, Rederstorff E, Sourice S, Biteau K, Hulin P, Forest V, Weiss P, Guicheux J, Lemarchand P. Intramyocardial delivery of mesenchymal stem cell-seeded hydrogel preserves cardiac function and attenuates ventricular remodeling after myocardial infarction. PLoS One 2012; 7:e51991. [PMID: 23284842 PMCID: PMC3527411 DOI: 10.1371/journal.pone.0051991] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Accepted: 11/09/2012] [Indexed: 12/18/2022] Open
Abstract
Background To improve the efficacy of bone marrow-derived mesenchymal stem cell (MSC) therapy targeted to infarcted myocardium, we investigated whether a self-setting silanized hydroxypropyl methylcellulose (Si-HPMC) hydrogel seeded with MSC (MSC+hydrogel) could preserve cardiac function and attenuate left ventricular (LV) remodeling during an 8-week follow-up study in a rat model of myocardial infarction (MI). Methodology/Principal Finding Si-HPMC hydrogel alone, MSC alone or MSC+hydrogel were injected into the myocardium immediately after coronary artery ligation in female Lewis rats. Animals in the MSC+hydrogel group showed an increase in cardiac function up to 28 days after MI and a mid-term prevention of cardiac function alteration at day 56. Histological analyses indicated that the injection of MSC+hydrogel induced a decrease in MI size and an increase in scar thickness and ultimately limited the transmural extent of MI. These findings show that intramyocardial injection of MSC+hydrogel induced short-term recovery of ventricular function and mid-term attenuation of remodeling after MI. Conclusion/Significance These beneficial effects may be related to the specific scaffolding properties of the Si-HPMC hydrogel that may provide the ability to support MSC injection and engraftment within myocardium.
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Weiss P, Stelmach GE, Adler CH, Waterman C. Parkinsonian arm movements as altered by task difficulty. Parkinsonism Relat Disord 2012; 2:215-23. [PMID: 18591043 DOI: 10.1016/s1353-8020(96)00026-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/15/1996] [Indexed: 11/29/2022]
Abstract
A discrete elbow movement to targets with different indexes of difficulty (ID) was used to determine the kinematic organization of arm movements in a young, an elderly and a Parkinson's disease (PD) group (n = 14). Target size and movement amplitude changes led to expected modifications of the kinematics in all three groups according to Fitts' law. Increased task demands by changing target size produced not only differences between the age-groups, but affected the modulation of velocity and acceleration in the parkinsonian patients differentially. For large amplitude movements, the PD patients were less able to increase velocity and acceleration magnitudes when target accuracy constraints were reduced. These findings, when taken together with the observation that speed scaling was preserved for small movement amplitudes, suggest that a reduced capability to initiate and regulate force is the cause for the observed slowness in PD.
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Fehrenbach J, Weiss P, Lorenzo C. Variational algorithms to remove stationary noise: applications to microscopy imaging. IEEE TRANSACTIONS ON IMAGE PROCESSING : A PUBLICATION OF THE IEEE SIGNAL PROCESSING SOCIETY 2012; 21:4420-30. [PMID: 22752131 DOI: 10.1109/tip.2012.2206037] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
A framework and an algorithm are presented in order to remove stationary noise from images. This algorithm is called variational stationary noise remover. It can be interpreted both as a restoration method in a Bayesian framework and as a cartoon+texture decomposition method. In numerous denoising applications, the white noise assumption fails. For example, structured patterns such as stripes appear in the images. The model described here addresses these cases. Applications are presented with images acquired using different modalities: scanning electron microscope, FIB-nanotomography, and an emerging fluorescence microscopy technique called selective plane illumination microscopy.
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Mack C, Sathyanarayana S, Weiss P, Mikonsaari I, Hübner C, Henning F, Elsner P. Twin-screw extrusion of multi walled carbon nanotubes reinforced polycarbonate composites: Investigation of electrical and mechanical properties. ACTA ACUST UNITED AC 2012. [DOI: 10.1088/1757-899x/40/1/012020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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118
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Dzirlo L, Haunold I, Lung S, Buchinger E, Müller-Knespel EM, Weiss P. [Pneumatosis intestinalis in anorexia nervosa: a case report]. ZEITSCHRIFT FUR GASTROENTEROLOGIE 2012; 51:1265-8. [PMID: 22890570 DOI: 10.1055/s-0031-1281680] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Pneumatosis intestinalis (PI) is identified as the accumulation of gas within the wall of the small or large intestine. It was first described by Du Vernoi in 1783. The pathogenesis is supposed to be multifactorial. It is assumed that there are 3 paths of disease development: mechanical, bacterial and biochemical. Adult patients are mostly asymptomatic and PI is diagnosed frequently by different radiological methods. The treatment of patients depends on their clinical picture. Most patients can be treated only with antibiotics and elemental diet. In a small number of cases, surgical intervention is essential. We report about a 35-year-old female patient with anorexia nervosa who developed PI after an excessive use of chewing gum for 3 years.
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de Vieilleville F, Weiss P, Lobjois V, Kouamé D. Alternating direction method of multipliers applied to 3D light sheet fluorescence microscopy image deblurring using GPU hardware. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2012; 2011:4872-5. [PMID: 22255430 DOI: 10.1109/iembs.2011.6091207] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This paper focuses on the deblurring and denoising of Poisson noise contaminated images acquired with a new imaging technique producing large 3D data sets: Light Sheet Fluorescence Microscopy. This paper details the optimization algorithm used, which is based on the Alternating Direction Method of Multipliers, and its efficient implementation using GPU hardware. In practice, a 3D 100 million voxel image is deconvolved in five minutes, which is at least 25 times faster than a state-of-the-art MATLAB implementation.
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Fatimi A, Tassin JF, Bosco J, Deterre R, Axelos MAV, Weiss P. Injection of calcium phosphate pastes: prediction of injection force and comparison with experiments. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:1593-603. [PMID: 22528073 DOI: 10.1007/s10856-012-4640-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2011] [Accepted: 03/29/2012] [Indexed: 05/06/2023]
Abstract
Calcium phosphate ceramics suspensions (ICPCS) are used in bone and dental surgery as injectable bone substitutes. This ICPCS biomaterial associates biphasic calcium phosphate (BCP) granules with hydroxypropylmethylcellulose (HPMC) polymer. Different ICPCS were prepared and their rheological properties were evaluated in parallel disks geometry as a function of the BCP weight ratio (35, 40, 45 and 50 %). The suspensions show a strongly increased viscosity as compared to the suspending fluid and the high shear rate part of the flow curve can be fitted with a power law model (Ostwald-de Waele model). The fitting parameters depend on the composition of the suspension. A simple device has been used to characterize extrusion of the paste using a disposable syringe fitted with a needle. The injection pressure of four ICPCS formulations was studied under various conditions (needle length and radius and volumetric flow rate), yielding an important set of data. A theoretical approach based on the capillary flow of non-Newtonian fluids was used to predict the necessary pressure for injection, on the basis of flow curves and extrusion conditions. The extrusion pressure calculated from rheological data shows a quantitative agreement with the experimental one for model fluids (Newtonian and HPMC solution) but also for the suspension, when needles with sufficiently large diameters as compared to the size of particles, are used. Depletion and possibly wall slip is encountered in the suspensions when narrower diameters are used, so that the injection pressure is less than that anticipated. However a constant proportionality factor exists between theory and injection experiments. The approach developed in this study can be used to correlate the rheological parameters to the necessary pressure for injection and defines the pertinent experimental conditions to obtain a quantitative agreement between theory and experiments.
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Badran Z, Boutigny H, Struillou X, Weiss P, Laboux O, Soueidan A. Clinical Outcomes After Nonsurgical Periodontal Therapy with an Er:YAG Laser Device: A Randomized Controlled Pilot Study. Photomed Laser Surg 2012; 30:347-53. [DOI: 10.1089/pho.2011.3215] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Portron S, Merceron C, Maillard N, Weiss P, Grimandi G, Vinatier C, Guicheux J, Gauthier O. Cellules souches et biomatériaux injectables pour la médecine régénératrice du cartilage : le consortium « chondrograft ». Ing Rech Biomed 2012. [DOI: 10.1016/j.irbm.2012.01.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Badran Z, Pilet P, Verron E, Bouler JM, Weiss P, Grimandi G, Guicheux J, Soueidan A. Assay of in vitro osteoclast activity on dentine, and synthetic calcium phosphate bone substitutes. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:797-803. [PMID: 22190199 DOI: 10.1007/s10856-011-4534-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Accepted: 12/11/2011] [Indexed: 05/31/2023]
Abstract
Resorption of synthetic bone substitute materials is essential for the integration of these materials into the natural bone remodeling process. Osteoclast behavior in the presence of calcium phosphate bioceramics (CaPB) is partially understood, and a better understanding of the underlying mechanisms is expected to facilitate the development of new synthetic bone substitutes to improve bone regeneration. In the present study, our aim was to investigate osteoclastic resorption of various synthetic CaPB. We used neonatal total rabbit bone cells to generate osteoclasts. Osteoclast-generated resorption on dentine and multiple CaPB was investigated by quantifying the surface resorbed and measuring tartrate resistant acid phosphatase (TRAP) enzyme activity. In this study, we observed that osteoclastic cells responded in a different way to each substrate. Both dentine and CaPB were resorbed but the quantitative results for the surface resorbed and TRAP activity showed a specific response to each substrate and that increased mineral density seemed to inhibit osteoclast activity.
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Merceron C, Portron S, Vignes-Colombeix C, Rederstorff E, Masson M, Lesoeur J, Sourice S, Sinquin C, Colliec-Jouault S, Weiss P, Vinatier C, Guicheux J. Pharmacological modulation of human mesenchymal stem cell chondrogenesis by a chemically oversulfated polysaccharide of marine origin: potential application to cartilage regenerative medicine. Stem Cells 2012; 30:471-80. [PMID: 22131189 PMCID: PMC3443367 DOI: 10.1002/stem.1686] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Revised: 10/31/2011] [Accepted: 11/15/2011] [Indexed: 01/09/2023]
Abstract
Mesenchymal stem cells (MSCs) are considered as an attractive source of cells for cartilage engineering due to their availability and capacity for expansion and multipotency. Differentiation of MSC into chondrocytes is crucial to successful cartilage regeneration and can be induced by various biological agents, including polysaccharides that participate in many biological processes through interactions with growth factors. Here, we hypothesize that growth factor-induced differentiation of MSC can be increased by chemically oversulfated marine polysaccharides. To test our hypothesis, human adipose tissue-derived MSCs (hATSCs) were cultured in pellets with transforming growth factor (TGF)-β1-supplemented chondrogenic medium containing either the polysaccharide GY785 DR or its oversulfated isoform GY785 DRS. Chondrogenesis was monitored by the measurement of pellet volume, quantification of DNA, collagens, glycosaminoglycans (GAGs), and immunohistological staining. Our data revealed an increase in pellet volume, total collagens, and GAG production with GY785 DRS and chondrogenic medium. The enhanced chondrogenic differentiation of hATSC was further demonstrated by the increased expression of several chondrogenic markers by real-time reverse transcription-polymerase chain reaction. In addition, surface plasmon resonance analyses revealed that TGF-β1 bound GY785 DRS with higher affinity compared to GY785 DR. In association with TGF-β1, GY785 DRS was found to upregulate the phosphorylation of extracellular signal-regulated kinase 1/2, indicating that oversulfated polysaccharide affects the mitogen activated protein kinase signaling activity. These results demonstrate the upregulation of TGF-β1-dependent stem cell chondrogenesis by a chemically oversulfated marine polysaccharide. This polysaccharide of marine origin is easily producible and therefore could be considered a promising additive to drive efficient and reliable MSC chondrogenesis for cartilage tissue engineering.
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Corre P, Khonsari RH, Laure B, Elamrani K, Weiss P, Mercier JM. [Synthetic calcium phosphate ceramics in secondary alveoloplasty]. ACTA ACUST UNITED AC 2012; 113:131-5. [PMID: 22306772 DOI: 10.1016/j.stomax.2011.12.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2011] [Revised: 05/14/2011] [Accepted: 12/23/2011] [Indexed: 11/24/2022]
Abstract
INTRODUCTION Bone substitutes are rarely used in the reconstruction of cleft lip and palate. The graft material of choice is cancellous bone, harvested in the hip or tibia. Tibial harvesting may lead to postoperative morbidity, or even complications. This has lead surgeons to develop alternative solution. We present a secondary alveolar bone grafting technique using synthetic calcium phosphate ceramics. OBSERVATION A patient presenting with a complete unilateral cleft lip and palate was treated by alveolar bone grafting at the age of nine years, using a mixture of autologous bone, harvested on the operative field, and particles of biphasic calcium phosphate (BCP); the graft was included in a platelet rich plasma (PRP) gel. The patient was followed up for eight years after the procedure. No sign of early or late infection was observed. At the end of facial growth, the cuspid had erupted correctly in a safe periodontal environment. Sequential X-rays showed complete filling of the initial bone defect, progressive resorption of ceramics, and spontaneous eruption of the cuspid. DISCUSSION In this long-term follow-up report, the use of BCP mixed with autologous bone did not interfere with dental eruption or maxilla growth. A second bone-harvesting site was thus avoided. BCP could be a suitable alternative to autologous bone graft for secondary alveoloplasty.
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