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Ferrero C, Humair L. Diagnostic de l’origine gauche ou droite d’un bruit de galop par la manœuvre de Valsalva. Cardiology 2008. [DOI: 10.1159/000168238] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Duchosal P, Ferrero C, Doret J, Andereggen P, Rilliet B. Les potentiels intra-cardiaques recueillis par cathétérisme chez l’homme. Cardiology 2008. [DOI: 10.1159/000164858] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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53
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Ferrero C, Arnold E, Bopp P. Etude de l’influence hémodynamique immédiate d’un diurétique mercuriel pur chez les cardiaques. Cardiology 2008. [DOI: 10.1159/000167415] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Ferrero C, Leupin A, Moret P, Cuénod CL. Oscillographie artérielle de la jambe. Changements de volumes et contours sphygmiques après effort. Cardiology 2008. [DOI: 10.1159/000165644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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57
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Duchosal PW, Ferrero C, Doret JP, Grosgurin J, Mastrangelo A. L’ordre d’excitation du myocarde ventriculaire. Cardiology 2008. [DOI: 10.1159/000164997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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59
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Doret J, Ferrero C. Inégalité de la température cutanée dans l’infarctus du myocarde et I’angine de poitrine. Cardiology 2008. [DOI: 10.1159/000165069] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Morawe C, Guigay JP, Mocella V, Ferrero C. An analytical approach to estimating aberrations in curved multilayer optics for hard x-rays: 2. Interpretation and application to focusing experiments. OPTICS EXPRESS 2008; 16:16138-16150. [PMID: 18825252 DOI: 10.1364/oe.16.016138] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Aberration effects are studied in parabolic and elliptic multilayer mirrors for hard x-rays, basing on a simple analytical approach. The interpretation of the underlying equations provides insight into fundamental limitations of the focusing properties of curved multilayers. Using realistic values for the multilayer parameters the potential impact on the broadening of the focal spot is evaluated. Within the limits of this model, systematic contributions to the spot size can be described. The work is complemented by a comparison with experimental results obtained with a W/B(4)C curved multilayer mirror.
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De Felici M, Felici R, Ferrero C, Tartari A, Gambaccini M, Finet S. Structural characterization of the human cerebral myelin sheath by small angle x-ray scattering. Phys Med Biol 2008; 53:5675-88. [PMID: 18812651 DOI: 10.1088/0031-9155/53/20/007] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Myelin is a multi-lamellar membrane surrounding neuronal axons and increasing their conduction velocity. When investigated by small-angle x-ray scattering (SAXS), the lamellar quasi-periodical arrangement of the myelin sheath gives rise to distinct peaks, which allow the determination of its molecular organization and the dimensions of its substructures. In this study we report on the myelin sheath structural determination carried out on a set of human brain tissue samples coming from surgical biopsies of two patients: a man around 60 and a woman nearly 90 years old. The samples were extracted either from white or grey cerebral matter and did not undergo any manipulation or chemical-physical treatment, which could possibly have altered their structure, except dipping them into a formalin solution for their conservation. Analysis of the scattered intensity from white matter of intact human cerebral tissue allowed the evaluation not only of the myelin sheath periodicity but also of its electronic charge density profile. In particular, the thicknesses of the cytoplasm and extracellular regions were established, as well as those of the hydrophilic polar heads and hydrophobic tails of the lipid bilayer. SAXS patterns were measured at several locations on each sample in order to establish the statistical variations of the structural parameters within a single sample and among different samples. This work demonstrates that a detailed structural analysis of the myelin sheath can also be carried out in randomly oriented samples of intact human white matter, which is of importance for studying the aetiology and evolution of the central nervous system pathologies inducing myelin degeneration.
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62
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Ponzio NR, Puppo MC, Ferrero C. Mixtures of Two Argentinean Wheat Cultivars of Different Quality: A Study on Breadmaking Performance. Cereal Chem 2008. [DOI: 10.1094/cchem-85-5-0579] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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63
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Guigay JP, Morawe C, Mocella V, Ferrero C. An analytical approach to estimating aberrations in curved multilayer optics for hard x-rays: 1. Derivation of caustic shapes. OPTICS EXPRESS 2008; 16:12050-12059. [PMID: 18679478 DOI: 10.1364/oe.16.012050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
An analytical approach has been developed to derive aberration effects in parabolic and elliptic multilayer optics with weak interaction between photons and matter. The method is based on geometrical ray tracing including refraction effects up to the first order of the refractive index decrement delta. In the parabolic case, the derivation leads to simple parametric equations for the caustic shape. In the elliptic case, the analytical results more involved, but can be well approximated by the parabolic solution. Both geometries are compared with regard to the fundamental impact on their focusing properties.
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Ferrero C, Doret J. Syndrome cérébelleux d'origine frontale. Eur Neurol 2008. [DOI: 10.1159/000148158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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66
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Mocella V, Ferrero C, Hrdý J, Wright J, Pascarelli S, Hoszowska J. Experimental verification of dynamical diffraction focusing by a bent crystal wedge in Laue geometry. J Appl Crystallogr 2008. [DOI: 10.1107/s0021889808017883] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Recent X-ray optical experiments have validated previous theoretical work on focusing by bent crystals in Laue geometry. It was shown that a suitable choice of the crystal thickness significantly improves the focusing performance of the crystal by combining the dynamical focusing of the Borrmann triangle with the geometrical focusing obtained by the crystal bending. The best focus size achieved during the experiments was less than 5 µm and is in practice limited by the source demagnification for the considered setup.
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Durelli L, Barbero P, Bergui M, Versino E, Bassano MA, Verdun E, Rivoiro C, Ferrero C, Picco E, Ripellino P, Giuliani G, Montanari E, Clerico M. MRI activity and neutralising antibody as predictors of response to interferon beta treatment in multiple sclerosis. J Neurol Neurosurg Psychiatry 2008; 79:646-51. [PMID: 17986500 DOI: 10.1136/jnnp.2007.130229] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVE To prospectively validate MRI activity and neutralising anti-interferon antibody (NAb) during the first 6 months of interferon beta treatment as response indicators in multiple sclerosis (MS). METHODS Patients with relapsing-remitting MS were followed during the first 2 years of treatment. Neurological assessments were performed every 3 months or when a relapse was suspected. MRI scans performed at baseline and at 3, 4, 5 and 6 months after the start of treatment were assessed centrally for disease activity: new T2 or gadolinium enhancing T1 lesions. NAb were assessed using the MxA protein assay; positivity was defined as two consecutive titres >or=20 NU/ml. We evaluated the predictivity of an active scan, NAb positivity, or both, during the first 6 months of treatment, on the occurrence of clinical disease activity in the following 18 months. RESULTS 147 patients were assessed at 16 centres. Predictivity parameters (with confidence intervals) were as follows: active scan, sensitivity (SN) 52% (34-69%), specificity (SP) 80% (65-91%), negative predictive value (NPV) 73% (58-77%), positive predictive value (PPV) 62% (42-79%), p = 0.002; NAb positivity, SN 71% (45-88%), SP 66% (55-76%), NPV 92% (82-97%), PPV 29% (16-45%), p = 0.01; active scan and NAb positivity, SN 71% (38-91%), SP 86% (73-94%), NPV 94% (86-98%), PPV 50% (29-70%), p = 0.0003. CONCLUSIONS MRI activity and NAb occurrence during the first 6 months of interferon beta treatment were reliable predictors of long term clinical response, particularly when combined. Patients with negative predictors showed a less than 10% risk of developing clinical activity. Patients with positive predictors showed a 50% risk of further clinical activity. These patients need to be followed carefully with further MRI and NAb tests.
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Ferrero C, Massuelle D, Jeannerat D, Doelker E. Towards elucidation of the drug release mechanism from compressed hydrophilic matrices made of cellulose ethers. I. Pulse-field-gradient spin-echo NMR study of sodium salicylate diffusivity in swollen hydrogels with respect to polymer matrix physical structure. J Control Release 2008; 128:71-9. [DOI: 10.1016/j.jconrel.2008.02.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2007] [Revised: 02/08/2008] [Accepted: 02/15/2008] [Indexed: 11/24/2022]
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Felici MD, Siegbahn EA, Spiga J, Hanson AL, Felici R, Ferrero C, Tartari A, Gambaccini M, Keyriläinen J, Bräuer-Krisch E, Randaccio P, Bravin A. Monte Carlo code comparison of dose delivery prediction for microbeam radiation therapy. ACTA ACUST UNITED AC 2008. [DOI: 10.1088/1742-6596/102/1/012005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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70
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Escudero JJ, Ferrero C, Jiménez-Castellanos MR. Compaction properties, drug release kinetics and fronts movement studies from matrices combining mixtures of swellable and inert polymers: Effect of HPMC of different viscosity grades. Int J Pharm 2008; 351:61-73. [PMID: 17996408 DOI: 10.1016/j.ijpharm.2007.09.031] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2007] [Revised: 09/11/2007] [Accepted: 09/17/2007] [Indexed: 11/20/2022]
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71
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Bravo-Osuna I, Ferrero C, Jiménez-Castellanos MR. Drug release behaviour from methyl methacrylate-starch matrix tablets: effect of polymer moisture content. Eur J Pharm Biopharm 2007; 69:285-93. [PMID: 17997292 DOI: 10.1016/j.ejpb.2007.09.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2007] [Revised: 09/27/2007] [Accepted: 09/28/2007] [Indexed: 10/22/2022]
Abstract
The aim of this work was to study the effect of the initial moisture content of the polymer on the tabletting and drug release behaviour of controlled release inert matrices elaborated with methyl methacrylate (MMA)-starch copolymers. The copolymers, obtained by free radical polymerisation and dried by two different methods (oven-drying or freeze-drying), were equilibrated at different relative humidities (0%, 25%, 50% and 75% RH) at room temperature. From these copolymers, matrix systems were directly compressed containing either a slightly water-soluble drug (anhydrous theophylline) or a freely water-soluble drug (salbutamol sulphate), and their compaction properties and in vitro dissolution profiles were evaluated. The release profiles were compared following model-independent methods, such as the Qt parameter and the similarity factor f2. Moreover, several kinetic models were employed to evaluate the possible changes in the release mechanism. For anhydrous theophylline, the initial moisture content of the copolymers did not affect the release characteristics from the inert matrices under study, and a typical Fickian diffusion mechanism was observed for the different formulations. However, in case of salbutamol sulphate, the presence of moisture might induce a fast drug dissolution, promoting the weakness of the matrix structure and hence, its partial disintegration. So, an "anomalous" mixed phenomenon of diffusion and erosion was found, influenced by the initial moisture content of the copolymer.
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Campos A, de la Guardia F, Reyes J, Ferrero C. [Adverse reactions induced by gadopentetate dimeglumine in magnetic resonance imaging]. ANALES DE MEDICINA INTERNA (MADRID, SPAIN : 1984) 2007; 24:428-430. [PMID: 18198950 DOI: 10.4321/s0212-71992007000900004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
BACKGROUND AND OBJECTIVES It is considered that the Gadolinium salts used as a contrast medium in the Magnetic Resonance Imaging (MRI) studies present an index of adverse reactions below the iodine contrast mediums. The main objective of this study is to determine, in our medium, the frequency and intensity of the adverse reactions related to the administration of Gadopentotate Dimeglumine (Gd-DTPA) and compare it with the rate of adverse reactions induced by the iodine contrast mediums. MATERIAL AND METHODS During the period comprised between 1st of January 2005 and 30th of June 2006, the adverse affects were collected for all the studies by means of MRI in which the Gd-DTPA contrast was applied, programmed or urgent, performed in Eresa Diagnosis Centres by Image located ( 11 centre in total) in the provinces of Castellón and Valencia. The adverse effects induced by the iodine salts were also collected in this period. RESULTS A total of 54,909 studies with magnetic resonance were performed in the referred study centres, and 12,791 studies with MCI. The total of adverse reactions observed was 62 (0.11%) and 47 (0.36%) respectively. The profile of adverse reactions with both contrast mediums was similar, except in the moderate reactions where we objectively observed a greater percentage of palpebral edema and dyspnea with the usage of MCI than with Gd-DTPA. No cases of anaphylaxia or exitus were observed. CONCLUSIONS The data contributed by this series support a safety profile of Gadolinium superior to that of the MCI in line with the results shown by extensive published series.
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Bravin A, Mocella V, Coan P, Astolfo A, Ferrero C. A numerical wave-optical approach for the simulation of analyzer-based x-ray imaging. OPTICS EXPRESS 2007; 15:5641-5648. [PMID: 19532822 DOI: 10.1364/oe.15.005641] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
An advanced wave-optical approach for simulating a monochromator-analyzer set-up in Bragg geometry with high accuracy is presented. The polychromaticity of the incident wave on the monochromator is accounted for by using a distribution of incoherent point sources along the surface of the crystal. The resulting diffracted amplitude is modified by the sample and can be well represented by a scalar representation of the optical field where the limitations of the usual 'weak object' approximation are removed. The subsequent diffraction mechanism on the analyzer is described by the convolution of the incoming wave with the Green-Riemann function of the analyzer. The free space propagation up to the detector position is well reproduced by a classical Fresnel-Kirchhoff integral. The preliminary results of this innovative approach show an excellent agreement with experimental data.
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Bravo-Osuna I, Ferrero C, Jiménez-Castellanos MR. Influence of moisture content on the mechanical properties of methyl methacrylate–starch copolymers. Eur J Pharm Biopharm 2007; 66:63-72. [PMID: 17005383 DOI: 10.1016/j.ejpb.2006.08.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2006] [Revised: 07/14/2006] [Accepted: 08/09/2006] [Indexed: 10/24/2022]
Abstract
The water vapour sorption-desorption behaviour of graft copolymers (hydroxypropylstarch-methyl methacrylate -HSMMA- and carboxymethylstarch-methyl methacrylate -CSMMA-) synthetised by free-radical polymerisation and alternatively dried by oven (OD) or freeze-drying (FD) techniques was investigated in a previous paper. The aim of the present study was to analyse the influence of the amount and distribution of water molecules on the flow and compaction characteristics of this family of methyl methacrylate-starch copolymers. Products were stored at constant temperature (25 degrees C) and different relative humidity conditions (RH). Flow properties of the powdered materials were evaluated using glass and stainless-steel funnels and the densification behaviour was studied in detail by means of Heckel treatment and compression parameters. Results revealed that the storage at 25-50% RH was the optimum condition relating flowability for HSMMA and OD-CSMMA copolymers. At higher RH values, the flow characteristics worsened, due to an increment in cohesive forces. Compaction experiments showed that the 25-50% RH range improved also the compression performance of the copolymers, due to increasing powder compressibility and reduced compact relaxation. Under these circumstances, absorbed water might act as plasticiser and adsorbed water as lubricant.
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Arduini A, Caciuffo R, Geremia S, Ferrero C, Ugozzoli F, Zontone F. Temperature Dependence of the Weak Host-guest Interactions in the p‐tertbutylcalix[4]Arene 1:1 Toluene Complex. Supramol Chem 2006. [DOI: 10.1080/10610279808055404] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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