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Barras A, Mezzetti A, Richard A, Lazzaroni S, Roux S, Melnyk P, Betbeder D, Monfilliette-Dupont N. Formulation and characterization of polyphenol-loaded lipid nanocapsules. Int J Pharm 2009; 379:270-7. [PMID: 19501139 DOI: 10.1016/j.ijpharm.2009.05.054] [Citation(s) in RCA: 164] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2009] [Revised: 04/27/2009] [Accepted: 05/25/2009] [Indexed: 11/25/2022]
Abstract
The purpose of this study was to design and characterize two flavonoid-loaded lipid nanocapsules (LNC) by applying the phase inversion process, and to enhance their apparent solubility and/or the stability. The flavonoid-loaded LNC were characterized by particle size, encapsulation efficiency, drug leakage rates, stability and spectroscopic studies. It was observed that quercetin-loaded LNC30 (3%) and LNC60 (2%) carried a particle size of 30.3 and 55.1 nm, respectively and significant higher entrapment efficiency. Encapsulation of quercetin (QC) in LNC enabled us to increase its apparent aqueous solubility by a factor of 100. And in view of calculations and results, it seems most probable that QC is arranged at this LNC interface between the oil phase and the hydrophilic polyethylene glycol moieties of the surfactant. In addition, colloidal suspensions proved to be stable in term of encapsulation for at least 10 weeks and QC was not oxidised. With simple chemical modification of (-)-epigallocatechin-3-gallate or (-)-EGCG, it was possible to reach very high encapsulation rates (95%). Thus we obtained stable colloidal suspensions of (-)-EGCG in water over 4 weeks while free (-)-EGCG solubilised in water exhibited 100% degradation within 4h. The initial problems (solubility and stability) of these flavonoids were resolved thanks to drug-loaded LNC.
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Débarre A, Kobylko M, Bonnot AM, Richard A, Popov VN, Henrard L, Kociak M. Electronic and mechanical coupling of carbon nanotubes: a tunable resonant Raman study of systems with known structures. PHYSICAL REVIEW LETTERS 2008; 101:197403. [PMID: 19113310 DOI: 10.1103/physrevlett.101.197403] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2008] [Indexed: 05/27/2023]
Abstract
We report on the first tunable resonant Raman scattering study performed on suspended isolated and coupled single-wall carbon nanotubes, unambiguously identified by electron diffraction. Besides the confirmation of the relation between the structural properties, the radial breathing frequency and the optical resonances for isolated metallic nanotubes, we evidence that interacting nanotubes experience drastic modifications of their resonance fingerprints. We first demonstrate a degeneracy lifting of an electronic level in a bundle of identical zigzag nanotubes. We then show the existence of a strong energy transfer mediated by a mechanical coupling between two nonidentical bundled nanotubes.
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Bourgade JL, Marmoret R, Darbon S, Rosch R, Troussel P, Villette B, Glebov V, Shmayda WT, Gomme JC, Le Tonqueze Y, Aubard F, Baggio J, Bazzoli S, Bonneau F, Boutin JY, Caillaud T, Chollet C, Combis P, Disdier L, Gazave J, Girard S, Gontier D, Jaanimagi P, Jacquet HP, Jadaud JP, Landoas O, Legendre J, Leray JL, Maroni R, Meyerhofer DD, Miquel JL, Marshall FJ, Masclet-Gobin I, Pien G, Raimbourg J, Reverdin C, Richard A, Rubin de Cervens D, Sangster CT, Seaux JP, Soullie G, Stoeckl C, Thfoin I, Videau L, Zuber C. Diagnostics hardening for harsh environment in Laser Megajoule (invited). THE REVIEW OF SCIENTIFIC INSTRUMENTS 2008; 79:10F301. [PMID: 19044614 DOI: 10.1063/1.2991161] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The diagnostic designs for the Laser Megajoule (LMJ) will require components to operate in environments far more severe than those encountered in present facilities. This harsh environment will be induced by fluxes of neutrons, gamma rays, energetic ions, electromagnetic radiations, and, in some cases, debris and shrapnel, at levels several orders of magnitude higher than those experienced today on existing facilities. The lessons learned about the vulnerabilities of present diagnostic parts fielded mainly on OMEGA for many years, have been very useful guide for the design of future LMJ diagnostics. The present and future LMJ diagnostic designs including this vulnerability approach and their main mitigation techniques will be presented together with the main characteristics of the LMJ facility that provide for diagnostic protection.
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Bourgade JL, Troussel P, Casner A, Huser G, Sangster TC, Pien G, Marshall FJ, Fariaud J, Remond C, Gontier D, Chollet C, Zuber C, Reverdin C, Richard A, Jaanimagi PA, Keck RL, Bahr RE, Armstrong WJ, Dewandel J, Maroni R, Aubard F, Angelier B, Cote CY, Magnan S. A versatile high-resolution x-ray imager (HRXI) for laser-plasma experiments on OMEGA. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2008; 79:10E904. [PMID: 19044559 DOI: 10.1063/1.2987975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A high-resolution x-ray imager (HRXI) devoted to laser-plasma experiments combines two state-of-the-art technologies developed in France: a high-resolution x-ray microscope and a high-speed x-ray streak camera. The resulting streaked imager achieves spatial and temporal resolutions of approximately 5 microm and approximately 10 ps, respectively. The HXRI has recorded enhanced spatial and temporal resolution radiographs of indirectly driven targets on OMEGA. This paper describes the main features of the instrument and details the activation process on OMEGA (particularly the alignment). Recent results obtained on joint CEA/LLE radiographic OMEGA experiments will also be presented.
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Lakhdar H, Zouhair K, Khadir K, Essari A, Richard A, Seité S, Rougier A. Evaluation of the effectiveness of a broad-spectrum sunscreen in the prevention of chloasma in pregnant women. J Eur Acad Dermatol Venereol 2007; 21:738-42. [PMID: 17567299 DOI: 10.1111/j.1468-3083.2007.02185.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Chloasma, or melasma, is a pigmentary disorder that can affect between 50% and 70% of pregnant women. During pregnancy, chloasma does not require any particular treatment beside the use of an effective sunscreen and avoiding the use of any photosensitizing products or inappropriate skin care routine. However, there exist very few studies related to the benefits of sunscreens to prevent this dermatosis. OBJECTIVE The aim of this study was to assess the role of a broad-spectrum sunscreen in the prevention and treatment of chloasma in pregnant women. METHODS We tested the effectiveness and tolerance of a sunscreen composition (SPF 50+, UVA-PF 28) during a 12-month clinical trial on 200 parturients. RESULTS The 'excellent' tolerance of the sunscreen under evaluation was confirmed. Out of 185 patients who completed the study, only five new cases of chloasma were noted, an occurrence of 2.7%, which is much lower than the 53% previously observed in an usual condition study (same investigators, same geographical area and same time frame). In addition, the clinical effectiveness of the evaluated sunscreen was judged 'excellent' by the majority of parturients and by the research dermatologists during all the consultations. It is also worth noting that at 6 months, a clinical improvement was observed in 8 out of 12 volunteers who were affected by a pre-existing chloasma observed during their inclusion visit. Colorimetric measurements showed that, at the end of their pregnancy, the parturients' skin was, on average, significantly lightened (increase of parameter L* in 38% cases) and less pigmented (reduction of parameter b* in 50% cases); thus, resulting in a significantly lighter skin colour (increase of ITA degrees in 69% cases) compared to their inclusion visit. CONCLUSIONS This study clearly demonstrates the effectiveness of the well-tolerated broad-spectrum sunscreen evaluated, in the prevention of the development of chloasma in pregnant women.
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Denolle T, Sharareh A, Dib M, Agaesse MF, Auguste V, Boutier H, Bouvet C, Maillard J, Richard A, Revault d'allonnes F. [Effectiveness of a health network in secondary prevention among coronary patients]. ARCHIVES DES MALADIES DU COEUR ET DES VAISSEAUX 2007; 100:625-629. [PMID: 17928764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
OBJECTIVE To improve the secondary prevention, particularly hypertension management among coronary patients. METHODS In 2004-2005, out of 175 coronary patients having taken part in a cycle of the Educoeur center of the health network Rivarance, 131 (75%) aged between 32-79 years of age (an average of 61 years with 11% women, 52% hypertensive, 24% smokers, 10% diabetics and 72% with unbalanced dyslipidemia (LDL>1g/l)) were re-examined within 12 months and were compared with a French cohort of the EuroAspire II study (365 patients - Lancet 2001). 56% were treated by angioplasty, 24% by coronary bypass and 20% by medical treatment. The 4-week ambulatory educational program consisted of a physical education with 22 meetings of cardiac rehabilitation (ergo cycle, carpet, segmentary muscular work, steps and balneotherapy) and a therapeutic and dietetic education (18 courses and cooking workshops, supermarket visits and self BP measurement). These 131 patients were re-examined 3, 6 and 12 months after by the paramedical team. The GP and nurses were taught recommendations on CV risk factors management. The patients were followed by a computerized medical file. BP (average of 3 measurements by OMRON M4), total cholesterol (CT), weight, physical activity (insufficient if less than 3 walks of 30 min per week), smoking and drugs intake were analyzed on J0 then at one year and were compared with the French results of EuroAspire II. [table: see text] CONCLUSION The education and the follow-up of the patient in a network of health improve CV risk factors and particularly hypertension management of these coronary patients but this decreases with time.
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Bethell R, De Muys J, Lippens J, Richard A, Hamelin B, Ren C, Collins P. In vitro interactions between apricitabine and other deoxycytidine analogues. Antimicrob Agents Chemother 2007; 51:2948-53. [PMID: 17517847 PMCID: PMC1932514 DOI: 10.1128/aac.01204-06] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Apricitabine is a novel deoxycytidine analogue reverse transcriptase inhibitor that is under development for the treatment of human immunodeficiency virus type 1 (HIV-1) infection. Apricitabine is phosphorylated to its active triphosphate by deoxycytidine kinase, which is also responsible for the intracellular phosphorylation of lamivudine (3TC) and emtricitabine (FTC); hence, in vitro studies were performed to investigate possible interactions between apricitabine and these agents. Human peripheral blood mononuclear cells (PBMC) were incubated for 24 h with various concentrations of (3)H-labeled or unlabeled apricitabine, 3TC, or FTC. Intracellular concentrations of parent compounds and their phosphorylated derivatives were measured by high-performance liquid chromatography. In other experiments, viral reverse transcriptase activity was measured in PBMC infected with HIV-1 bearing M184V in the presence of various concentrations of apricitabine and 3TC. [(3)H]apricitabine and [(3)H]3TC were metabolized intracellularly to form mono-, di-, and triphosphates. 3TC and FTC (1 to 10 microM) produced concentration-dependent decreases in apricitabine phosphorylation; in contrast, apricitabine at concentrations of up to 30 muM had no effect on the phosphorylation of 3TC or FTC. The combination of apricitabine and 3TC reduced the antiviral activity of apricitabine against HIV-1: apricitabine concentrations producing 50% inhibition of viral reverse transcriptase were increased two- to fivefold in the presence of 3TC. These findings suggest that nucleoside reverse transcriptase inhibitors with similar modes of action may show biochemical interactions that affect their antiviral efficacy. It is therefore essential that potential interactions between combinations of new and existing agents be thoroughly investigated before such combinations are introduced into clinical practice.
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Richard A, Godart F, Brevière GM, Francart C, Foucher C, Rey C. [Abnormal origin of the left coronary artery from the pulmonary artery: a retrospective study of 36 cases]. ARCHIVES DES MALADIES DU COEUR ET DES VAISSEAUX 2007; 100:433-8. [PMID: 17646770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The aim of this study was to show the evolution of diagnostic techniques revealing an abnormal origin of the left coronary artery and present the follow-up results of patients operated for this malformation at different ages. This retrospective study includes 36 children or adults, with a mean age at the moment of of 28 months old, ranging from 7 days to 39 years. In 9% of cases, patients were asymptomatic. Before 1990, 81% of children had a cardiac catheterization, versus 25% after. Indeed, echocardiography with color Doppler enabled the diagnosis of abnormal origin of the left coronary artery in 70% of cases. The pre-operative mortality is at 21% (12.5% after 1990). Twenty-three patients had surgery: left coronary artery reimplantation (n=16), bypass (n=5), at mean of 44 months old for the entire series, but 21 months old after 1990. The follow-up was clinical, ECG and radiographic and echocardiographic after 1975; when possible an exercise test, cardiac nuclear imaging and more recently coronary CT scan and MRI have been performed. In conclusion, children are operated earlier and the follow-up should focus on the detection of occlusion of the re-implanted left coronary artery by echocardiography, with or without stress, exercise test, cardiac nuclear imaging, MRI and sometimes, coronary angiography.
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Moulin F, Cantegreil-Kallen I, De Rotrou J, Weinisch E, Batouche F, Richard A, Rigaud AS. Stress, maladie d’alzheimer et psychothérapie. Encephale 2006; 32 Pt 4:S1158-9. [PMID: 17356491 DOI: 10.1016/s0013-7006(06)76308-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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De Rotrou J, Thévenet S, Richard A, Cantegreil I, Wenisch E, Chausson C, Moulin F, Batouche F, Rigaud AS. Impact d’un programme psycho-éducatif sur le stress des aidants de patients Alzheimer. Encephale 2006; 32 Pt 5:S650-5. [PMID: 17099590 DOI: 10.1016/s0013-7006(06)76217-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Poindron D, Godart F, Duhamel A, Richard A, Francart C, Brevière GM, Rey C. [The effect of an endothelin receptor antagonist in Eisenmenger syndrome: a single-center experience of 11 patients]. ARCHIVES DES MALADIES DU COEUR ET DES VAISSEAUX 2006; 99:457-62. [PMID: 16802735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The Eisenmenger syndrome is a complication of congenital heart disease with significant left-to-right shunts, such as large ventricular septal defects, and corresponds to fixed pulmonary hypertension with shunt reversal. Bosentan, an inhibitor of endothelin A and B receptors, is a new molecule previously validated in the treatment of primary pulmonary hypertension. The authors report their monocentric experience of bosentan in 11 consecutive patients with the Eisenmenger syndrome treated for at least one year. This retrospective study comprised 7 females and 4 males with an average age of 34 years (range 17 to 51 years). The underlying lesion was ventricular septal defect (n = 4), atrial septal defect (n = 3), pulmonary atresia with septal defect (n = 4 of which 2 were treated palliatively). Before treatment, the patients were classified according to the NHYA functional class (I, II, IIIa and IIIb, IV or, respectively from 1 to 5) with a distribution in this series between Classes IIIa and IV (average 3.81 +/- 0.75) and from 3 to 10 on Borg's dyspnoea scale (average 6.54 +/- 2.29). The ambient oxygen saturation (SaO2) at rest was, on average 77 +/- 9%, the haemoglobin concentration 16.6 +/- 2.4 g/dl; hepatic transaminase levels were normal. The 6 minute walk test before treatment was 216 +/- 111 m with marked desaturation on exercise (49 +/- 18%). With Bosentan, patients were globally much better clinically with a decrease in dyspnoea, improvement in NHYA class and increased 6 minute walking perimeter. Improvement in NYHA class was observed from 3 months' treatment (3.0 +/- 0.8, p = 0.0002) and was sustained to one year (2.54 +/- 0.7, p< 0.001). An improvement of dyspnoea on Borg's scale was observed from the second month's treatment (5.56 +/- 1.65, p = 0.0201) and persisted throughout follow up to one year (3.81 +/- 1.32, p < 0.0001). Similarly, the 6 minute walking perimeter increased from the first control at 6 months (323 +/- 82 m, p < 0.0001) and at one year (322 +/- 62 m, p <0.0004). Finally, although a significant increase in SaO2 was observed at 6 months (p = 0.0032), this was hardly significant at one year (82 +/- 10 %, p = 0.0512). Transaminase levels did not rise significantly at the follow up visits (p = ns) and the haemoglobin concentration was unchanged. No patient died during the study period. This study showed a clear functional improvement in patients with Eisenmenger's syndrome treated with bosentan. The drug was well tolerated clinically with few adverse effects and a good safety margin of usage.
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Godart F, Brevière GM, Francart C, Cajot MA, Richard A, Rey C. [Percutaneous angioplasty of native coarctation of the aorta. Results in children and young adults]. ARCHIVES DES MALADIES DU COEUR ET DES VAISSEAUX 2006; 99:419-23. [PMID: 16802728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The authors report the experience of one centre in the treatment of native coarctation of the aorta by percutaneous angioplasty. Between 1999 and August 2005, 22 patients (7 girls, 15 boys) underwent dilatation of their coarctation by a balloon catheter at an average age of 11.8 +/- 5 years and body weight of 44 +/- 21 kg. In 20 patients, balloon angioplasty alone was performed and, in the other two, the angioplasty was associated with the insertion of a covered CP stent. The dilatation was performed with a balloon/coarctation ratio of 2.18 +/- 0.6 (1.7 to 3.5) and a balloon/isthmus ratio of 1.0 +/- 0.23 (0.7 to 1.87). After the procedure, ascending aortic pressure decreased from 134.7 +/- 23.4 mmHg to 125 +/- 22.7 mmHg (p= 0.0003); descending aortic pressure increased from 93.4 +/- 14.9 mmHg to 104.8 +/- 21.7 mmHg (p= 0.003); transisthmic pressure gradient decreased from 41.7 +/- 14.1 mmHg to 19.8 +/- 9.5 mmHg (p< 0.0001) and the diameter of the coarctation increased from 5.9 +/- 2.6 mm to 9.3 +/- 2.6mm (p= 0.0015). The two patients treated by covered CP stents had excellent immediate results without significant residual gradients. After dilatation (sometimes repeated, N= 13), a gradient > 20 mmHg persisted in ten patients (36% of cases) but no predictive factor was found on statistical analysis. There were no cases of acute aneurysm. In one patient, the femoral pulse decreased but returned to normal with heparin therapy. No patient required emergency surgical treatment after the angioplasty. During the clinical follow-up, echocardiography and MRI showed no signs of aneurysm and one patient had mild irregularity of the isthmic region. Three patients underwent surgery by resection suture for persistent coarctation (one combined with a Ross procedure); another patient was treated by a CP stent. In conclusion, percutaneous angioplasty of native coarctation of the aorta gives satisfactory results with few complications in bigger children and young adults. The results can be improved by using a slightly higher balloon/coarctation ratio.
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Hiroto K, Kumar A, Brasic J, Alexander M, Ye W, McCaul M, Wand G, Earley C, Richard A, McCann U, Ricaurte G, Wong D. Dopamin receptors, transporters, and amphetamine-induced release in late middle life. Neuroimage 2006. [DOI: 10.1016/j.neuroimage.2006.04.099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Vaz G, Richard A, Guyen O, Bejui-Hugues J, Carret JP. Le fibrome desmoplastique ou fibrome desmoïde osseux. ACTA ACUST UNITED AC 2005; 91:782-7. [PMID: 16553001 DOI: 10.1016/s0035-1040(05)84490-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Desmoplastic fibroma or desmoid bone tumor is a rare tumor described for the first time by Jaffe in 1958. It accounts for 0.1 to 0.3% of all benign bone tumors. To date, about 150 cases involving the locomotor system have been reported. Histology is required for certain diagnosis of desmoplastic fibroma. The tumor is composed of sparse fibroblasts in a rich background of collagen fibers, a histological presentation exactly the same as soft tissue desmoid fibroma. We report two new cases of desmoplastic fibroma of the locomotor system. The observations illustrate the radiological diagnosis. MRI was used to search for local extension in bone or soft tissues. Biopsy is necessary to confirm the diagnosis. The histological presentation may be difficult to recognized and distinguish from low grade fibrosarcoma. After treatment, the rate of local recurrence is high in the event of partial resection. Surgery is the optimal treatment, with tumor resection as wide as possible depending on the localization.
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Julien C, Débarre A, Nutarelli D, Richard A, Tchénio P. Single Molecule Study of Perylene Orange Photobleaching in Thin Sol−Gel Films. J Phys Chem B 2005; 109:23145-53. [PMID: 16375276 DOI: 10.1021/jp052398x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The paper reports on photobleaching mechanisms of perylene orange embedded in thin sol-gel films, derived from single molecule studies. The experimental configuration uses wide-field illumination and one photon excitation of the molecules. Measurements have been performed both at ambient conditions and under vacuum in order to get information on the influence of oxygen on photobleaching in such porous samples. We have also recorded the evolution of photobleaching with respect to the excitation intensity. The results demonstrate that photobleaching from excited states higher than the first singlet and triplet states has a nonnegligible contribution as soon as the excitation energy exceeds a few hundred W/cm2 and that this process is favored in the presence of air. The study also demonstrates that perylene orange in sol-gel films is not a very efficient emitter but that photobleaching can be slow, which explains the interest for perylene orange as a good candidate to produce long lifetime solid-state lasers when embedded in monoliths of sol-gel.
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Alt C, Anticic T, Baatar B, Barna D, Bartke J, Betev L, Białkowska H, Billmeier A, Blume C, Boimska B, Botje M, Bracinik J, Bramm R, Brun R, Buncić P, Cerny V, Christakoglou P, Chvala O, Cramer JG, Csató P, Darmenov N, Dimitrov A, Dinkelaker P, Eckardt V, Farantatos G, Flierl D, Fodor Z, Foka P, Freund P, Friese V, Gál J, Gaździcki M, Georgopoulos G, Gładysz E, Grebieszkow K, Hegyi S, Höhne C, Kadija K, Karev A, Kliemant M, Kniege S, Kolesnikov VI, Kollegger T, Kornas E, Korus R, Kowalski M, Kraus I, Kreps M, van Leeuwen M, Lévai P, Litov L, Lungwitz B, Makariev M, Malakhov AI, Markert C, Mateev M, Mayes BW, Melkumov GL, Meurer C, Mischke A, Mitrovski M, Molnár J, Mrówczyński S, Pálla G, Panagiotou AD, Panayotov D, Petridis A, Pikna M, Pinsky L, Pühlhofer F, Reid JG, Renfordt R, Richard A, Roland C, Roland G, Rybczyński M, Rybicki A, Sandoval A, Sann H, Schmitz N, Seyboth P, Siklér F, Sitar B, Skrzypczak E, Stefanek G, Stock R, Ströbele H, Susa T, Szentpétery I, Sziklai J, Trainor TA, Varga D, Vassiliou M, Veres GI, Vesztergombi G, Vranić D, Wetzler A, Włodarczyk Z, Yoo IK, Zaranek J, Zimányi J. Omega- and Omega+ production in central Pb + Pb collisions at 40 and 158A GeV. PHYSICAL REVIEW LETTERS 2005; 94:192301. [PMID: 16090164 DOI: 10.1103/physrevlett.94.192301] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2004] [Indexed: 05/03/2023]
Abstract
Results are presented on Omega production in central Pb+Pb collisions at 40 and 158A GeV beam energy. For the first time in heavy ion reactions, rapidity distributions and total yields were measured for the sum Omega(-) + Omega(+) at 40A GeV and for Omega(-) and Omega(+) separately at 158A GeV. The yields are strongly underpredicted by the string-hadronic UrQMD model but agree better with predictions from hadron gas models.
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Rakza T, Richard A, Lelieur AC, Villaume I, Huyghe A, Nempont C, Storme L. Facteurs influençant la délivrance de substances perfusées à faible débit par seringue autopulsée : conséquences sur la perfusion de médicaments vasoactifs chez l'enfant prématuré. Arch Pediatr 2005; 12:548-54. [PMID: 15885544 DOI: 10.1016/j.arcped.2005.01.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2004] [Accepted: 01/24/2005] [Indexed: 10/25/2022]
Abstract
UNLABELLED The infusion of vasoactive drugs in preterm babies using syringe pumps can be complicated by important variations in the infusion rate. AIMS OF THE STUDY 1) to assess the time between pump start and the actual presence of a substance in the circulation, when using slow rates; 2) to evaluate the effects of changes in the main infusion rate on substance rates infused on the same line. METHODS We used 10% glucose to mimic vasoactive drugs. The main infusion consisted of saline, and both were infused on the same line using syringe pumps. Glucose concentration was measured at the end of the line. RESULTS The time between pump start and the actual infusion of glucose depended on syringe volume and on the adjustment of the syringe in the pump. There was a transient increase in glucose rate when the main rate increased, and a transient decrease when the main rate decreased. CONCLUSION To minimize the time before a substance is actually infused, one should use low volume syringes and correctly adjust the syringe in the pump. Moreover, when a steady infusion rate is necessary, one should avoid variations in the main infusion rate.
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Alt C, Anticic T, Baatar B, Barna D, Bartke J, Betev L, Białkowska H, Billmeier A, Blume C, Boimska B, Botje M, Bracinik J, Bramm R, Brun R, Buncić P, Cerny V, Christakoglou P, Chvala O, Cramer JG, Csató P, Darmenov N, Dimitrov A, Dinkelaker P, Eckardt V, Farantatos G, Flierl D, Fodor Z, Foka P, Freund P, Friese V, Gál J, Gaździcki M, Georgopoulos G, Gładysz E, Grebieszkow K, Hegyi S, Höhne C, Kadija K, Karev A, Kliemant M, Kniege S, Kolesnikov VI, Kollegger T, Kornas E, Korus R, Kowalski M, Kraus I, Kreps M, van Leeuwen M, Lévai P, Litov L, Lungwitz B, Makariev M, Malakhov AI, Markert C, Mateev M, Mayes BW, Melkumov GL, Meurer C, Mischke A, Mitrovski M, Molnár J, Mrówczyński S, Pálla G, Panagiotou AD, Panayotov D, Petridis A, Pikna M, Pinsky L, Pühlhofer F, Reid JG, Renfordt R, Richard A, Roland C, Roland G, Rybczyński M, Rybicki A, Sandoval A, Sann H, Schmitz N, Seyboth P, Siklér F, Sitar B, Skrzypczak E, Stefanek G, Stock R, Ströbele H, Susa T, Szentpétery I, Sziklai J, Trainor TA, Trubnikov V, Varga D, Vassiliou M, Veres GI, Vesztergombi G, Vranić D, Wetzler A, Włodarczyk Z, Yoo IK, Zaranek J, Zimányi J. System-size dependence of strangeness production in nucleus-nucleus collisions at squareroot[sNN]=17.3 GeV. PHYSICAL REVIEW LETTERS 2005; 94:052301. [PMID: 15783629 DOI: 10.1103/physrevlett.94.052301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2004] [Indexed: 05/24/2023]
Abstract
Emission of pi+/-, K+/-, phi, and Lambda was measured in near-central C+C and Si+Si collisions at 158 AGeV beam energy. Together with earlier data for p+p, S+S, and Pb+Pb, the system-size dependence of relative strangeness production in nucleus-nucleus collisions is obtained. Its fast rise and the saturation observed at about 60 participating nucleons can be understood as the onset of the formation of coherent systems of increasing size.
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Châtain F, Richard A, Deschamps G, Chambat P, Neyret P. [Revision total knee arthroplasty after unicompartmental femorotibial prosthesis: 54 cases]. ACTA ACUST UNITED AC 2004; 90:49-57. [PMID: 14968003 DOI: 10.1016/s0035-1040(04)70006-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
PURPOSE OF THE STUDY We analyzed technical difficulties encountered when performing revision total knee arthroplasty in patients with unicompartmental femorotibial prostheses. MATERIAL AND METHODS This multicentric retrospective study included 54 revisions of unicompartmental femorotibial prosthesis with implantation of a total knee prosthesis. The series included 45 medial and nine lateral compartment prostheses. A gliding total knee prosthesis was implanted in 53 cases (98%) (39 standard, 14 revision). Mean time to failure of the unicompartmental prosthesis was four years. IKS scores were established at review. The radiological work-up included AP and lateral views in single leg stance and goniometry for 22 medial compartment revisions. Twenty-seven patients were seen for physical examination and x-rays and eight were lost to follow-up; data were recorded from medical files for 19 patients. RESULTS The revision procedure was considered easy in 82% of the cases. Mean follow-up after revision was four years (range 2 - 12 years). Subjective outcome was very satisfactory for 56% of the patients, satisfactory for 36% and unsatisfactory for 8%. The mean function score was 62 points, the mean knee score 85 points, and the mean flexion was 113 degrees. No laxity was found for 90% of the knees. The femorotibial angle was 180 +/- 2 degrees in 46% of the patients. The mechanical femoral angle was 90 degrees in 54% of the patients with 2-4 degrees varus in 42%. The mechanical tibial angle was 90 degrees in 46% of the patients with 2-8 degrees valgus in 37%. Complications included pulmonary embolism (n=2), mobilization under general anesthesia (n=3), arthrolysis (n=1), lateral vertical patellectomy (n=1), and secondary infection (n=1). There were five failures requiring changing the total knee prosthesis. DISCUSSION Loss of bone stock raises specific problems during revision of unicompartmental knee prostheses. Loss of tibial bone is more frequent but it is more difficult to correct for loss of femoral bone. A gliding knee prosthesis is generally preferred for first intention revision. We recommend a long stem when the bone defect is important or involves loss of cortical bone. We have had good mid-term results with revision total knee prostheses after unicompartmental prostheses. Longer follow-up is needed. Poor results were obtained when revision was performed for persistent pain without a clearly defined cause. The presence or not of significant bone loss did not appear to affect outcome. The observation of medial laxity in case of failed lateral unicompartmental prostheses suggests a more constrained total knee prosthesis might be indicated. Compared with earlier series, our results with total knee prostheses after unicompartmental prostheses appear to be better than after tibial valgus osteotomy and also better than after total knee arthroplasty. Conversely, they would be less satisfactory than for primary total knee arthroplasty. The surgical procedure for revision total knee arthroplasty after unicompartmental prosthesis requires precision and skill but is not technically difficult.
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Pollo C, Richard A, De Preux J. Résection d’un schwannome rétropéritonéal en sablier par abord combiné. Neurochirurgie 2004; 50:53-6. [PMID: 15097921 DOI: 10.1016/s0028-3770(04)98306-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND AND PURPOSE We report a remarkable case of retroperitoneal schwannoma with significant spinal growth illustrating the effectiveness of a combined surgical approach. METHODS A 41-year-old man presented with a long history of back pain and unexplained weight loss. An abdominal mass was found in the right upper quadrant. The CT-scan revealed a partially cystic lesion located in the right psoas muscle. Spinal extension was noticed through the L1-L2 neural foramen. MRI better showed the wide rostro-caudal extension in the spinal canal. RESULTS Bilateral L1 and L2 laminectomy was performed to remove the spinal portion of the tumor. It was extradural but attached to the dura. The roots were not infiltrated. The retroperitoneal mass was removed by an anterior transperitoneal approach. The histological examination did not reveal criteria of malignancy. CONCLUSIONS Retroperitoneal schwannomas are rare and their preoperative diagnosis remains difficult. In case of significant spinal growth, a combined surgical exposure should be preferred to allow total removal of the lesion and control of the neurological structures.
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Débarre A, Jaffiol R, Julien C, Richard A, Nutarelli D, Tchénio P. Antenna effect in dimetallofullerene peapods. Chem Phys Lett 2003. [DOI: 10.1016/j.cplett.2003.08.064] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Débarre A, Jaffiol R, Julien C, Nutarelli D, Richard A, Tchénio P. Specific Raman signatures of a dimetallofullerene peapod. PHYSICAL REVIEW LETTERS 2003; 91:085501. [PMID: 14525252 DOI: 10.1103/physrevlett.91.085501] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2002] [Indexed: 05/24/2023]
Abstract
We report on the Raman spectroscopy of a dimetallofullerene peapod, (La(2)@C(80))(m)@SWNT. Drastic changes are observed with respect to pristine nanotubes. A sharp intense line at 142 cm(-1) is interpreted as a signature of polymerization of the encapsulated metallofullerenes. Additional strong signatures appear at about 400, 520, and 640 cm(-1), respectively. Their intensity suggests the existence of an enhancement effect. The stiffening and the up-shift of the G-band modes appear to imply that a charge transfer process between the nanotube and the peas occurs.
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Krakowski I, Theobald S, Balp L, Bonnefoi MP, Chvetzoff G, Collard O, Collin E, Couturier M, Delorme T, Duclos R, Eschalier A, Fergane B, Larue F, Magnet M, Minello C, Navez ML, Richard A, Richard B, Rostaing-Rigattieri S, Rousselot H, Santolaria N, Torloting G, Toussaint S, Vuillemin N, Wagner JP, Fabre N. Summary version of the Standards, Options and Recommendations for the use of analgesia for the treatment of nociceptive pain in adults with cancer (update 2002). Br J Cancer 2003; 89 Suppl 1:S67-72. [PMID: 12915905 PMCID: PMC2753010 DOI: 10.1038/sj.bjc.6601086] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Siari S, Scali J, Richard A, Tretarre B, Daurès JP, Padilla M, Grosclaude P, Gerber M. Subregional variations of dietary consumption and incidences of cancers in southern France. IARC SCIENTIFIC PUBLICATIONS 2003; 156:127-9. [PMID: 12484144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
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Débarre A, Jaffiol R, Richard A, Tchénio P. Raman hyperspectral imaging applied to chemical co-localization in diluted samples of perylene-doped nanotubes. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)01608-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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