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Bianchi-Demicheli F, Perrin E, Dupanloup A, Dumont P, Bonnet J, Berthoud M, Kulier R, Bettoli L, Lorenzi-Cioldi F, Chardonnens D. Contraceptive counselling and social representations: a qualitative study. Swiss Med Wkly 2006; 136:127-34. [PMID: 16633957 DOI: 10.4414/smw.2006.11218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
BACKGROUND Contraceptive use is a complex issue and several studies have been conducted in an effort to understand user behaviour. It is of interest to explore the representations of professionals who give advice on contraception, since their views could have an impact on contraceptive use. METHODS Individual in-depth interviews of 65 healthcare professionals likely to provide contraceptive advice to patients at a Swiss maternity unit. RESULTS 83% of healthcare professionals interviewed were favourable to contraception in general while being highly critical of its practical efficacy. The methods most often spontaneously cited were oral contraceptive pills, male condom, intrauterine devices and hormonal implants. Theoretically, all methods should be proposed during contraceptive counselling but in practice interviewees have different social representations of user groups and associate them with specific contraceptive methods. Personal experience appears to play a bigger role than scientific knowledge. CONCLUSIONS The counsellor's social representations probably play an important role in determining user behaviour. These representations should be taken into consideration in the training of healthcare professionals in this field.
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Condat B, Zanditenas D, Collot V, Legoupil N, Cazals-Hatem D, Hauuy MP, Bonnet J, Ngo Y, Roucoules J, Blazquez M. Une nouvelle cause de cholangite intra et extra-hépatique : le syndrome d’hypersensibilité médicamenteuse ou DRESS. ACTA ACUST UNITED AC 2006; 30:142-6. [PMID: 16514397 DOI: 10.1016/s0399-8320(06)73131-1] [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: 10/22/2022]
Abstract
The DRESS (Drug Rash with Eosinophilia and Systemic Symptoms) corresponds to a drug reaction generally including cutaneous eruption, fever, hematologic abnormalities such as eosinophilia and atypical lymphocytosis and one or more specific visceral lesions specially in the liver. We report a case of drug hypersensitivity syndrome or DRESS associated with intra and extra-hepatic biliary lesions. This syndrome was associated with sulfasalazine and naproxene therapy. A reactivation of HHV6 was documented in the continuations of the DRESS and could play a role in the symptomms.
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Milia J, Teyssier F, Dalenc F, Ader I, Delmas C, Pradines A, Lajoie-Mazenc I, Baron R, Bonnet J, Cohen-Jonathan E, Favre G, Toulas C. Farnesylated RhoB inhibits radiation-induced mitotic cell death and controls radiation-induced centrosome overduplication. Cell Death Differ 2005; 12:492-501. [PMID: 15776002 DOI: 10.1038/sj.cdd.4401586] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Our previous results demonstrated that expressing the GTPase ras homolog gene family, member B (RhoB) in radiosensitive NIH3T3 cells increases their survival following 2 Gy irradiation (SF2). We have first demonstrated here that RhoB expression inhibits radiation-induced mitotic cell death. RhoB is present in both a farnesylated and a geranylgeranylated form in vivo. By expressing RhoB mutants encoding for farnesylated (RhoB-F cells), geranylgeranylated or the CAAX deleted form of RhoB, we have then shown that only RhoB-F expression was able to increase the SF2 value by reducing the sensitivity of these cells to radiation-induced mitotic cell death. Moreover, RhoB-F cells showed an increased G2 arrest and an inhibition of centrosome overduplication following irradiation mediated by the Rho-kinase, strongly suggesting that RhoB-F may control centrosome overduplication during the G2 arrest after irradiation. Overall, our results for the first time clearly implicate farnesylated RhoB as a crucial protein in mediating cellular resistance to radiation-induced nonapoptotic cell death.
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Le Morvan V, Formento JL, Milano G, Bonnet J, Robert J. Techniques de recherche des polymorphismes génétiques. ONCOLOGIE 2005. [DOI: 10.1007/s10269-005-0146-8] [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]
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Bonnet J, Neukomm S. Sur la composition chimique de la fumée du tabac III. La fraction acide et l'uréthanne. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19570400323] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Brunisholz G, Bonnet J. Sur le dosage de l'acide borique. I. Séparation de l'acide borique d'avec l'ion ammonium et les cations métalliques au moyen d'échangeurs d'ions. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19510340649] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Bonnet J, Neukomm S. Sur la composition chimique de la fumée du tabac. I. Analyse de la fraction neutre. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19560390631] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Bonnet J, Neukomm S. Sur la composition chimique de la fumée du tabac. II. La fraction alcaline. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19570400114] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Lemann M, Bonnet J, Allez M, Gornet JM, Mariette X. [Bone and joints in inflammatory bowel disease]. GASTROENTEROLOGIE CLINIQUE ET BIOLOGIQUE 2004; 28:D75-82. [PMID: 15213667 DOI: 10.1016/s0399-8320(04)94991-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
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Condat B, Bonnet J, Hauuy MP, Collot V, Charlier A, Dugue L, Ngo Y, Maftouh A, Diche T, Bandin O, Guigui B, Asli B, Blazquez M. [Hepatitis C virus infection and primary hepatic large B-cell lymphoma: a non-fortuitous association. Case report and review of literature]. GASTROENTEROLOGIE CLINIQUE ET BIOLOGIQUE 2003; 27:1157-9. [PMID: 14770120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
We report a case of hepatitis C virus infection in association with primary hepatic large B-cell non-Hodgkin's lymphoma. Primary hepatic non-Hodgkin's lymphoma is a rare disease. Association of hepatitis C virus infection with primary hepatic B-cell non-hodgkin's lymphoma is probably not fortuitous. Indeed, in case of primary hepatic non-hodgkin's lymphoma' patients are often hepatitis C virus positive. Moreover, several studies have reported a high prevalence of chronic hepatitis C virus infection among patients with B-cell non-Hodgkin's lymphoma whatever the localization of the lymphoma. A recent study found a high rate of remission of a splenic form of lymphoma after treatment of hepatitis C virus infection. Our case report confirms the hypothesis of a key role of hepatitis C virus in the pathogenesis of various forms of B-cell lymphoproliferative disorders and in particular in primary hepatic lymphoma.
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Mercié P, Etienne G, Couffinhal T, Vatan R, Bonnet J, Grenouillet M, Malvy D, Longy-Boursier M. Anévrismes et sténoses coronariennes au cours d'une maladie de Takayasu. Rev Med Interne 2003. [DOI: 10.1016/s0248-8663(03)80219-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Masana L, Madan T, Visvikis S, Sass C, Baranova H, Bonnet J, Dembinska A, Ehrlich H, Gueyffier F, Schmitz G, Siest G, Zannis V. Which, and how limited number of polymorphisms should be selected per disease, risk assessment, health profile or biological system? Clin Chem Lab Med 2003; 41:554-8. [PMID: 12747602 DOI: 10.1515/cclm.2003.084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Erlich H, Bonnet J, Frueh FW, Bertrand P, Schmitz G, Salvatore G, Little S, Lambert C, Baranova E, Siest G. Pharmacogenetics: from bench to bedside. Clin Chem Lab Med 2003; 41:610-4. [PMID: 12747610 DOI: 10.1515/cclm.2003.092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Sabate JM, Villarejo J, Lemann M, Bonnet J, Allez M, Modigliani R. An open-label study of thalidomide for maintenance therapy in responders to infliximab in chronically active and fistulizing refractory Crohn's disease. Aliment Pharmacol Ther 2002; 16:1117-24. [PMID: 12030953 DOI: 10.1046/j.1365-2036.2002.01273.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
BACKGROUND Infliximab, a chimeric monoclonal antibody to tumour necrosis factor-alpha, is a new potent therapy for active Crohn's disease, but induces short-lived improvements. AIM To evaluate the efficacy of thalidomide, a drug with anti-tumour necrosis factor-alpha activity, for the maintenance of infliximab-induced response in refractory Crohn's disease. METHODS Fifteen patients with severe, refractory disease (10 females, five males; mean age, 40 years; eight with luminal disease, two with fistulizing disease and five with both luminal and fistulizing disease) were started on thalidomide (100 mg daily), 29 +/- 10 days after they had responded to infliximab (5 mg/kg infusions). RESULTS The median follow-up period was 238 days (range, 10-458 days) from the initiation of thalidomide and 265 days (range, 10-537 days) from the last infliximab infusion. The median Crohn's disease activity indices were 322 (range, 170-525), 119 (range, 24-503) and 35 (range, -60-360) before infliximab, at the initiation of thalidomide and at the end of follow-up, respectively. Remission rates on thalidomide were 92%, 83% and 83% at 3, 6 and 12 months, respectively, after the last infliximab infusion (Kaplan-Meier). Four patients (two in remission) stopped thalidomide for suspected adverse effects. Side-effects (drowsiness, rash and peripheral neuropathy) were mild and mostly transient. CONCLUSIONS Thalidomide appears to be an effective and relatively safe drug to maintain response to infliximab in chronically active and fistulizing refractory Crohn's disease.
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Allez M, Lemann M, Bonnet J, Cattan P, Jian R, Modigliani R. Long term outcome of patients with active Crohn's disease exhibiting extensive and deep ulcerations at colonoscopy. Am J Gastroenterol 2002; 97:947-53. [PMID: 12003431 DOI: 10.1111/j.1572-0241.2002.05614.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE Prediction of the clinical course of Crohn's disease (CD) is difficult in the long term. Our aim was to determine whether the presence of severe endoscopic lesions (SELs) may predict a higher risk of colectomy and penetrating complications. METHODS All patients at our institution with active ileocoIonic CD who had colonoscopies between 1990 and 1996 were included in the study. SELs were defined as extensive and deep ulcerations covering more than 10% of the mucosal area of at least one segment of the colon. RESULTS Among the 102 patients included, 53 had SELs at index colonoscopy. During the follow-up (median = 52 months), 37 patients underwent colonic resection. Probabilities of colectomy at 1, 3, and 8 yr were 20%, 26%, and 42%. Risk of colectomy was independently affected by the presence of SELs at index colonoscopy (relative risk [RR] = 5.43, 95% CI = 2.64-11.18), a Crohn's Disease Activity Index level greater than 288 (RR = 2.21, 95% CI = 1.09-4.47), and the absence of immunosuppressive therapy during the follow-up (RR = 2.44, 95% CI = 1.20-5.00). Probabilities of colectomy were, respectively, 31% and 6% at 1 yr, 42% and 8% at 3 yr, and 62% and 18% at 8 yr in patients with and without SELs. We performed a second analysis excluding the 14 patients operated on within the 3 months after the index colonoscopy: presence of SELs remained the only significant factor predictive of colectomy (RR = 6.72, 95% CI = 2.26-20.03). All six patients with penetrating complications during the follow-up had SELs at index colonoscopy. CONCLUSIONS Patients with CD exhibiting deep and extensive ulcerations at colonoscopy have a more aggressive clinical course with an increased rate of penetrating complications and surgery.
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Delannes M, Latorzeff I, Carrie C, Alibelli MJ, Bonnet J, Duthil P. [Intracoronary brachytherapy]. Cancer Radiother 2002; 6:116-8. [PMID: 12035483 DOI: 10.1016/s1278-3218(02)00157-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Couffinhal T, Dufourcq P, Jaspard B, Daret D, Allières C, Alzieu P, Serre P, Bonnet J, Duplàa C. Kinetics of adventitial repair in the rat carotid model. Coron Artery Dis 2001; 12:635-48. [PMID: 11811329 DOI: 10.1097/00019501-200112000-00007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Discrepancies between success in experimental animals with a variety of pharmacologic strategies and failure with such agents in clinical trials have raised questions concerning the mechanism of restenosis. Recent observations suggest a potential implication for the adventitial (Adv) layer in neointimal formation. METHODS The purpose of this study was to examine the Adv changes in the rat carotid artery subjected to balloon injury. These changes were characterized by morphometric, immunohistochemical, and electron microscopy analyses, with special attention devoted to early time-points post-injury. RESULTS We report that the most important adventitial changes occurred in the first 48 h post-injury. Within 2 h there was extensive cell-loss by apoptosis and oncosis in the Adv and in the media; this was followed by the rapid onset of proliferation and a parallel slow increase in Adv thickening, reaching a maximum at 7 days. We further demonstrate an early migration of these Adv cells to the media and neointima. Moreover, we characterize the Adv cell phenotype with a panel of antibodies. Within 48 h after injury, a population of Adv cells expressed alpha-actin and vinculin with a maximum expression 7 days post-injury. At that time, these Adv cells started to express smooth muscle myosin heavy chain, a specific marker of smooth muscle cells. In parallel, we report an impaired production of elastic fibres in the Adv and medial layer. CONCLUSIONS We reported a detailed time-course of adventitial changes after rat carotid injury (cell death, proliferation, migration and differentiation) that supports an important role of adventitia in neointima formation.
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Sabatini M, Thomas M, Deschamps C, Lesur C, Rolland G, de Nanteuil G, Bonnet J. Effects of ceramide on aggrecanase activity in rabbit articular cartilage. Biochem Biophys Res Commun 2001; 283:1105-10. [PMID: 11355886 DOI: 10.1006/bbrc.2001.4920] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Ceramide participates in signal transduction of IL-1 and TNF, two cytokines likely involved in cartilage degradation in osteoarthritis. We previously showed that ceramide stimulates proteoglycan degradation, mRNA expression of matrix metalloproteinase (MMP)-1, -3, and -13, and pro-MMP-3 production in rabbit cartilage. Since aggrecan, the main cartilage proteoglycan, can be cleaved by metalloproteinases both of MMP and aggrecanase type, the aim of this study was to determine if ceramide stimulates aggrecanase action and, if that is the case, in which measure aggrecanase mediates the degradative effect of ceramide. To this end, antibodies were used against the C terminal aggrecan neoepitopes generated by aggrecanases (NITEGE(373)) and MMPs (DIPEN(341)). Ceramide C(2) at 10(-5) to 10(-4) M dose-dependently increased NITEGE signal, without changing that of DIPEN, in cultured explants of rabbit cartilage. The effects of 10(-4) M C(2) on NITEGE signal and proteoglycan degradation were similarly antagonized by the metalloproteinase inhibitor batimastat, with return to the basal level at 10(-6) M. These results show that, similarly to IL-1 and TNF, ceramide-induced aggrecan degradation is mainly due to aggrecanases. That no increase of MMP activity was detected, despite stimulation of MMP expression, was probably due to lack of proenzyme conversion to mature form, since addition of a MMP activator to C(2)-treated cartilage increased both DIPEN signal and proteoglycan degradation. These findings support the hypothesis that cytokine-induced ceramide could play a mediatory role in situations of increased degradation of cartilage matrix.
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Marazanof M, Thiessard F, Laffort P, Lemieux H, Chene G, Bonnet J, Roudaut R. [Aortic atheroma: not a sensitive indicators for coronary artery disease in patients with mitral valve disease]. ARCHIVES DES MALADIES DU COEUR ET DES VAISSEAUX 2001; 94:563-8. [PMID: 11480153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
Aortic atheroma detected by transoesophageal echocardiography has been reported to be a good prognostic marker for coronary disease on angiography. The value of this detection in valvular heart disease would be to avoid preoperative coronary angiography in asymptomatic patients. The aim of this study was to assess the prognostic value of aortic atheroma in a population with a low prevalence of coronary artery disease in whom transoesophageal echocardiography was systematically performed. In addition, calcification of the aortic knuckle, a marker of atherosclerosis, was analysed by simple chest X-ray. One hundred and ninety two patients (103 men, 89 women; mean age: 63.1 +/- 15 years), operated for mitral valve replacement, underwent transoesophageal echocardiography, angiography, within 6 months, and chest X-ray. The cardiovascular risk factors, presence of aortic atherome, angiographic coronary artery disease and aortic calcification were studied. Aortic atheroma was observed in 72 patients (37.5%), usually in the descending thoracic aorta (73.6%). Coronary stenosis was observed in 36 patients (18.7%). On univariate analysis, aortic atherome predicted coronary stenosis with a sensitivity of 53%, specificity of 66% and positive predictive value of 26% and negative predictive value of 86%, compared with chest X-ray: 71%, 65%, 33% and 90%, respectively. In multivariate analysis, only hypercholesterolaemia, smoking and age predicted the presence of coronary artery disease. The presence of aortic atheroma was not predictive (p = 0.3). The authors conclude that aortic atheroma does not predict the presence of coronary artery disease in a patient population with mitral valve disease and a low prevalence of coronary artery disease. Simple chest X-ray has almost the same diagnostic value. The association of these two investigations does not give sufficient negative predictive values to avoid coronary angiography.
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De Ceuninck F, Pastoureau P, Agnellet S, Bonnet J, Vanhoutte PM. Development of an enzyme-linked immunoassay for the quantification of YKL-40 (cartilage gp-39) in guinea pig serum using hen egg yolk antibodies. J Immunol Methods 2001; 252:153-61. [PMID: 11334975 DOI: 10.1016/s0022-1759(01)00352-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
An indirect competition immunoassay for the quantification of YKL-40 (cartilage gp-39, Chondrex) in guinea pig serum has been developed using egg yolk antibodies (IgY). The immune response of hens to YKL-40 was verified by immunoblot analyses. Highly specific antibodies were obtained 30 days after the first injection. The ELISA was developed in 96-well microtiter plates with quadruplicate determinations for each point. The assay was based on the ability of YKL-40 present in serum to displace the binding of antibodies to the coated antigen. An inhibition mixture containing standard YKL-40 or guinea pig serum, diluted 1/5, and primary antibodies, diluted 1/5000, was allowed to equilibrate for 2 h at room temperature and dispensed for 16 h at 4 degrees C in wells coated with 1 microg/ml of YKL-40. Detection was achieved by the addition of rabbit anti-chicken antibodies conjugated to peroxidase followed by tetramethylbenzidine. Specificity was assessed by parallelism between a dilution curve of serum and standard YKL-40. The sensitivity of detection was 10 ng/ml. Intra- and interassay coefficients of variation were both 8.7%. The analytical recovery was 101.5+/-5.4% (mean+/-standard deviation (SD), n=9). The YKL-40 concentration in serum from 12 adult guinea pigs was 330+/-216 ng/ml (mean+/-SD) with a lower value of 164 ng/ml and an upper value of 982 ng/ml. In contrast to the rat, a dilution curve of rabbit serum gave parallelism with the guinea pig standard, suggesting recognition of a similar epitope. Possible applications of the assay in the guinea pig include disease models where YKL-40 is overexpressed and could be used as a marker, i.e. osteoarthritis, rheumatoid arthritis, cancer, liver fibrosis, atherosclerosis and more generally, pathologies with increased tissue remodeling.
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Chollet AM, Le Diguarher T, Murray L, Bertrand M, Tucker GC, Sabatini M, Pierré A, Atassi G, Bonnet J, Casara P. General synthesis of alpha-substituted 3-bisaryloxy propionic acid derivatives as specific MMP inhibitors. Bioorg Med Chem Lett 2001; 11:295-9. [PMID: 11212095 DOI: 10.1016/s0960-894x(00)00646-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Modulations of alpha and aryl substitutions on 3-aryloxy propionic acid hydroxamates led to novel and potent inhibitors of MMP-2,3,9 and 13, and selectivity versus MMP-1.
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Bonnet J, Palau JM, Soonckindt L, Lassabatere L. On the interest of a current amplifier associated with a Kelvin vibrating capacitor. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3735/10/3/006] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Lassabatere L, Alibert C, Bonnet J, Soonckindt L. The use of surface properties for determining semiconductor band gaps. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3735/9/9/022] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Bonnet J. L'athérosclérose : un défi commun du biologiste et du clinicien. Med Sci (Paris) 2001. [DOI: 10.4267/10608/1886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Pierre A, Bonnet J, Vekris A, Portier J. Encapsulation of deoxyribonucleic acid molecules in silica and hybrid organic-silica gels. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2001; 12:51-55. [PMID: 15348377 DOI: 10.1023/a:1013857102461] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The encapsulation of small DNA molecules was attempted in pure silica and in hybrid polyvinyl alcohol-silica gels. The materials which were obtained were examined by nitrogen adsorption, and by 29Si and 31P NMR spectroscopy. The extraction of the DNA molecules from the gels was examined in a buffer aqueous solution as well as in an acidic medium. The results suggested that the DNA molecules remained trapped inside the gels due to a permanent bonding to the gel network.
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