[en] Activated carbon fibres in the form of felt or cloth have received an increasing attention in recent years as adsorbents for air and water purification. Their porosity have been characterized by high resolution transmission electron microscopy scanning electronic microscopy (SEM) 14 or scanning tunnelling microscopy (STM). The present study tempts to correlate the performances of activated carbon fibres in adsorbing different organic compounds in aqueous solutions, with their porous structure deduced either from indirect methods as N₂, adsorption, either from direct methods as microscopies. The studied rayon fibres, carbonized and activated in different operating conditions, are observed through two kinds of microscopy : Scanning Electronic Microscopy (SEM) and Atomic Force Microscopy (AFM), better appropriate than STM to observe low conductivity materials, as activated carbons are. in spite of lower resolution. The influence of activation conditions on porosity and adsorption properties of low (aromatics like phenol) and high molecular weights (humic substances) is deduced.

[en] The 2D radiative transfer equation coupled with specular reflection boundary conditions is solved using finite element schemes. Both Discontinuous Galerkin and Streamline-Upwind Petrov–Galerkin variational formulations are fully developed. These two schemes are validated step-by-step for all involved operators (transport, scattering, reflection) using analytical formulations. Numerical comparisons of the two schemes, in terms of convergence rate, reveal that the quadratic SUPG scheme proves efficient for solving such problems. This comparison constitutes the main issue of the paper. Moreover, the solution process is accelerated using block SOR-type iterative methods, for which the determination of the optimal parameter is found in a very cheap way.

[en] CeO₂ films formation is studied on single crystals and (1 0 0) oriented nickel substrates (Ni RABiTs) via the metal organic deposition technique. Ce(III) 2-ethylhexanoate: Ce(EH)₃, in solution in toluene is used as chemical precursor. Homogeneous films are easily deposited by spin coating and their crystallisation performed at 800-900 deg. C leads to bi-axial texturation on MgO, STO and Ni RABiTs with the (2 0 0) planes parallel to the surface. In the case of Ni RABiTs, the degree of disorientation is directly linked to that of the template substrate. For Ni substrates, the conditions implemented avoid the oxidation of the Ni but allow the formation of the cerium oxide. These films are good candidates to be buffer layers in the architecture of coated conductors for high Tc superconducting cables applications

[en] [³H]lithium 9-boratabicyclo[3.3.1]nonane, at specific activity of 52-55 Ci/mmol, was synthesized by reduction of B-OMe-9-BBN with lithium tritide. Its reducing characteristics were illustrated by the synthesis of [17-³H] estradiol, [2-³H] dihydrotetrabenazine and 1-(hydroxy[³H]methyl)naphtalene, with good radiochemical yields and high specific activities. (Author)

[en] The author report a study aimed at assessing the tolerance and efficiency of a technique which has been used for some years and which comprises the implantation of Gliadel wafers in the operative bed before performing a concomitant radiotherapy and chemotherapy with temozolomide, followed by six adjuvant chemotherapy sessions with the Stupp protocol. Four women and seven men have been implanted with Gliadel wafers. Only one patient did not have the concomitant chemo-radiotherapy. The global survival and global survival without progression have been assessed. Even though the obtained results are encouraging, the concomitant chemo-radiotherapy had to be stopped for three patients due to haematological consequences. Short communication

[en] A new tritiation method was used to obtain 2-deoxy-D-glucose [2,6,6'-³H] starting from a mixture of protected bromo deoxy glucose derivatives. Intermediates were characterized by ¹H- and ³H-NMR. (author)

[en] In order to label proteins with tritium in high specific activity, we synthesized ³H-formaldehyde with a specific activity of about 15 Ci/mmol (555 GBq/mmol). The method is suitable for the synthesis of about 100 mCi (3.7 GBq) of tritiated formaldehyde directly used for the reductive methylation of proteins. (author)

[en] Short communication

[en] Syntheses and analyses of three tritiated rat atrial natriuretic peptides(ANF) derivatives: (4-³H-Phe⁸)ANF, (4-³H-Phe²⁶)ANF, (4-³H-Phe⁸, 3, 5-³H₂-Tyr²⁸)ANF are described. These biologically active peptides were obtained by catalytic dehalogenation of iodinated precursors in the presence of tritium gas and Pd catalysts and exhibited high specific radioactivity (20-55 Ci/mmol, 740-2035 GBq/mmol). A radioactive by-product isolated by HPLC was characterized as a modified linear analogue of ANF(1-28): ³H-(Ala^7,23)ANF and was biologically active. (author)

[en] The hydrogen isotope exchange of Brefeldin-A with tritium gas (T₂) in 1,4-dioxane was studied over a commercial palladium catalyst supported on diatomaceous earth (5% metallic weight). The effect of the gas phase was studied. Addition of air in the gas phase led to an increase of the catalytic activity. Moreover, exchange was enhanced when the air/T₂ ratio reached a value of 4. This latter result is interpreted, principally, in terms of a strongly poisoning of the metallic particles together with an effect of the T₂ partial pressure. Through the comparison with Pd(II) oxide, the role of the support is also shown. The specific activities ranged up to 2.8 Ci/mMoles. The labelled product was analyzed by ³H NMR. Possible mechanisms for tritium incorporation are discussed and two different adsorbed species, on the catalyst surface, are involved. (author)