Search

Les fractures articulaires de l’épiphyse distale du radius de type Die Punch sont difficiles à traiter chirurgicalement. Une marche d’escalier interfragmentaire de un millimètre est la limite tolérée afin d’éviter la formation d’arthrose radiocarpienne. Nous avons voulu montrer grâce à une étude anatomique que la cimentoplastie sous contrôle arthroscopique peut être un atout intéressant dans le traitement des fractures die punch.

Les fractures articulaires de l’épiphyse distale du radius de type Die Punch sont difficiles à traiter chirurgicalement. Une marche d’escalier interfragmentaire d’un millimètre est la limite tolérée afin d’éviter la formation d’arthrose radiocarpienne. Nous avons voulu montrer grâce à une étude anatomique que la cimentoplastie sous contrôle arthroscopique peut être un atout intéressant dans le traitement des fractures Die Punch.

Nos mesures V-I sur YBa2Cu3O7-xcéramique, dans la limite I=0, confirment une transition de phase du second ordre à une température critique Tc(0)T_{\rm c}(0),\ \sigma\sim\bar{t}^{-\gamma}$avec γ≃ 0,9 et $\bar{t}=(T-T_{\rm c}(I))/T_{\rm c}(0)$, ce comportement est identique à celui observé en l'absence de courant (I=0) lorsque T→Tc(0)+. Pour les températures $T_{\rm c}(I)\lesssim T\ll T^{*}(I)

Abstract:: The reflectivity spectra of an oriented ceramic of Bi-2223 has been investigated by polarized infrared reflectivity spectroscopy in the energy range 0.005-2.2 eV. It is shown that the data for the polarization parallel to the c axis cannot be fitted with a one-component Drude or extended-Drude model. The conductivity spectrum is then obtained from the best fit of a “double-damping Drude” model to reflectivity spectra, itself derived from the factorized form of the dielectric function, and by a Kramers-Kronig inversion as well. The data and their analysis give a new insight of the 2D character of the system.

The temperature dependence of the reflectivity spectra of three manganites ceramics with compositions Pr0.7Ca0.3MnO3, Pr0.7Ca0.25Sr0.05MnO3and Pr0.7Ca0.1Sr0.2MnO3has been investigated by infrared reflectivity spectroscopy in the wave number range 0.005-1.1 eV. The compound Pr0.7Ca0.25Sr0.05MnO3which shows the largest conductivity jump at the ferromagnetic-paramagnetic phase transition has been studied in details. The optical conductivity of this compound is deduced from the best fit to reflectivity spectra of a “double-damping Drude” model, itself derived from the factorized form of the dielectric function. Excellent agreement with Kramers-Kronig transformation is reported. The model allows in particular to discriminate the contributions to the optical conductivity of trapped charges (polarons) and mobile charge carriers.

The conventional quantizer design based on average error minimization over a training set does not guarantee a good subjective behavior on individual images even if perceptual metrics are used.

Résumé A l'occasion d'anomalies de la veine cave inférieure dont 6 cas nouveaux sont présentés, l'étude de l'organogenèse de la veine cave inférieure est reprise à partir de la littérature et de reconstructions personnelles d'embryons: l'évolution de cette organogenèse est précisée par rapport aux stades de Streeter.

We have previously reported that expression of the c-myb gene in normal avian thymic cells proceeds through the intermolecular recombination of ET (thymus-specific) and c-myb coding sequences, thereby generating a novel type of c-myb product. Antisense transcripts expressed from the ET locus encode the extremely well-conserved splicing factor PR264/SC35. We now show that the human PR264 promoter sequences contain several myb-recognition elements that efficiently interact in vitro with the c-myb DNA-binding domain. Moreover, expression from the PR264 promoter is transactivated, both in vitro and in cultured cells, by different c-myb products. Thus, the PR264 gene is most likely a physiological target for the c-myb family of transcription factors.

We previously established that the expression of a thymic c-myb mRNA species requires the intermolecular recombination of coding sequences expressed from transcriptional units localized on different chromosomes, in both chicken and human. We now report that a putative splicing factor (PR264), extremely well conserved in chicken and human, is encoded by the opposite strand of the c-myb trans-spliced exon. The PR264 polypeptide, which contains a typical ribonucleoprotein 80 and an arginine/serine-rich domain, is highly homologous to the Drosophila splicing regulators tra, tra-2, and su(wa) and to the human alternative splicing factor ASF/SF2. Furthermore, we show that PR264-specific mRNAs are expressed in normal hematopoietic cells of chicken and human origin and that the relative proportion of the PR264 transcripts is developmentally regulated in chicken.

Myeloblastosis-associated virus type 1 (MAV1) derived from a molecular clone of infectious proviral DNA (B. Perbal, J. S. Lipsick, J. Svoboda, R. F. Silva, and M. A. Baluda, J. Virol. 56:240-244, 1985) was shown to specifically induce nephroblastoma in chickens and therefore belongs to the MAV-N class. We show that nephroblastomas are polyclonal tumors containing rearranged proviral genomes. Rearrangements occur preferentially in the gag-pol region of the MAV1 proviral genome, and similar rearrangements can be detected in well-developed independent tumors.

Brown Leghorn chicken embryo fibroblasts were transfected with a mixture of avian myeloblastosis virus (AMV) and myeloblastosis-associated virus type 1 (MAV1) proviral DNA purified from lambda-Charon 4A recombinant clones. A transformed cell line (T1AM) able to grow without anchorage in semisolid medium was obtained. The presence of both proviral AMV and MAV sequences was detected in T1AM DNA by hybridization with v-myb- and MAV1-specific probes. Altered AMV and MAV1 proviral genomes were found in T1AM genome. Characterization of the RNA species expressed in transformed cells showed that in addition to a 2.5-kilobase (kb) putative subgenomic v-myb-specific RNA, three other myb-containing RNAs (9.4, 8.4, and 7.0 kb) were present in T1AM cells. No AMV genomic RNA was detected. Also, a new 5.0-kb MAV1-specific RNA species was expressed in transformed cells in addition to MAV1 genomic RNA species (7.8 kb). No infectious AMV virions are released by T1AM cells. Chicken embryo fibroblasts infected by T1AM-released virions contained and expressed all MAV1 sequences detected in T1AM transformed cells but did not express any transformation parameter. These results indicated that the presence of AMV proviral sequences in T1AM cells is responsible for their transformed phenotype.

Our measurements V-I in YBa2Cu3O7-xceramic, in the limit I=0, confirm a second-order phase transition at a critical temperature Tc(0)Tc(0), ??t-?with ??0.9 and t=(T-Tc(I))/Tc(0) where Tc(I) corresponds to the critical temperature shift due to I. This conductivity critical behaviour is identical to the one observed as T?Tc(0)+and I=0. For the temperature range Tc(I)Tc(0), ??t-?avec ?? 0,9 et t=(T-Tc(I))/Tc(0), ce comportement est identique ? celui observ? en l'absence de courant (I=0) lorsque T?Tc(0)+. Pour les temp?ratures Tc(I)?T?T*(I)

The plane-wave-spectrum technique is applied to study the transmission of a three-dimensional beam through a dielectric slab. The electromagnetic beam radiated from an aperture antenna is represented by an angular spectrum of plane waves. The use of three different co-ordinate systems using rectangular co-ordinates allows a rigorous formulation to be obtained. The near field transmitted through a dielectric slab is obtained and compared with measurements.

La pachydermopériostose (PDP), génodermatose autosomique récessive, est exceptionnelle. La mutation de SCLO2A1 associerait un phénotype plus sévère et des anomalies hématologiques plus fréquentes.

An alternative transform coder design criterion based on restricting the maximum perceptual error of each coefficient is proposed. This perceptually uniform quantisation of the transform domain ensures that the perceptual error will be below a certain limit regardless of the particular input image. The results show that the proposed criterion improves the subjective quality of the conventional average error criterion even if it is weighted with the same perceptual metric.