Faint arc-minute extended radio emission around Cygnus X-3

Aims.We revisit the vicinity of the microquasar Cygnus X-3 at radio wavelengths. We aim to improve our previous search for possible associated extended radio features/hot spots in the position angle of the Cygnus X-3 relativistic jets focusing on shorter angular scales than previously explored. Methods.Our work is mostly based on analyzing modern survey and archive radio data, mainly including observations carried out with the Very Large Array and the Ryle Telescopes. We also used deep near-infrared images that we obtained in 2005. Results.We present new radio maps of the Cygnus X-3 field computed after combining multi-configuration Very Large Array archive data at 6 cm and different observing runs at 2 cm with the Ryle Telescope. These are probably among the deepest radio images of Cygnus X-3 reported to date at cm wavelengths. Both interferometers reveal an extended radio feature within a few arc-minutes of the microquasar position, thus making our detection more credible. Moreover, this extended emission is possibly non-thermal, although this point still needs confirmation. Its physical connection with the microquasar is tentatively considered under different physical scenarios. We also report on the serendipitous discovery of a likely Fanaroff-Riley type II radio galaxy only away from Cygnus X-3.

Possible hot spots excited by the relativistic jets of Cygnus X-3

We present the results of a deep search for associated radio features in the vicinity of the microquasar Cygnus X-3. The motivation behind is to find out evidence for interaction between its relativistic jets and the surrounding interstellar medium, which could eventually allow us to perform calorimetry of the total energy released by this microquasar during its flaring lifetime. Remarkably, two radio sources with mJy emission level at centimeter wavelengths have been detected in excellent alignment with the position angle of the inner radio jets. We propose that these objects could be the hot spots where the relativitic outflow collides with the ambient gas in analogy with Fanaroff-Riley II radio galaxies. These candidate hot spots are within a few arc-minutes of Cygnus X-3 and, if physically related, the full linear extent of the jet would reach tens of parsecs. We discuss here the evidence currently available to support this hypothesis based on both archival data and our own observations.

Informe sobre les X Jornades d'Arxivística de Catalunya: "Els arxivers com (ens) comuniquem?" (Terrassa, 19, 20 i 21 de maig de 2005)

Com ja és costum des de fa vint anys (1985-2005), pel maig l'Associació d'Arxivers de Catalunya (AAC) convoca els seus associats i la comunitat arxivística en general a les Jornades d'Arxivística de Catalunya. Enguany han estat les desenes i amb el títol "Els arxivers com (ens) comuniquem?" s'han dut a terme els dies 19, 20 i 21 de maig a la ciutat de Terrassa. L'objectiu de les X Jornades ha estat doble: en primer lloc, s'ha volgut reflexionar sobre les estratègies de què disposen els arxivers per fer difusió de la seva activitat professional ("com comuniquem") i a continuació s'ha produït el debat sobre la comunicació intraprofessional dels arxivers ("com ens comuniquem").

Final Report Energy Efficiency Plans and Programs Study Committee, February 2009

The Legislative Council created the Energy Efficiency Plans and Programs Study Committee for the 2008 Legislative Interim pursuant to the passage of S.F. 2386 during the 2008 Legislative Session, which provided, in Section 8: The Legislative Council is requested to establish an interim study committee to examine the existence and effectiveness of energy efficiency plans and programs implemented by gas and electric public utilities, with an emphasis on results achieved by current plans and programs from the demand, or customer, perspective, and to make recommendations for additional requirements applicable to energy efficiency plans and programs that would improve such results. In conducting the study and developing recommendations, the Committee shall consider testimony from the Iowa Utilities Board, rate and nonrate-regulated gas and electric utilities, the Consumer Advocate, state agencies involved with energy efficiency program administration, environmental groups and associations, and consumers.

DNA methylation profiles of human active and inactive X chromosomes.

X-chromosome inactivation (XCI) is a dosage compensation mechanism that silences the majority of genes on one X chromosome in each female cell. To characterize epigenetic changes that accompany this process, we measured DNA methylation levels in 45,X patients carrying a single active X chromosome (X(a)), and in normal females, who carry one X(a) and one inactive X (X(i)). Methylated DNA was immunoprecipitated and hybridized to high-density oligonucleotide arrays covering the X chromosome, generating epigenetic profiles of active and inactive X chromosomes. We observed that XCI is accompanied by changes in DNA methylation specifically at CpG islands (CGIs). While the majority of CGIs show increased methylation levels on the X(i), XCI actually results in significant reductions in methylation at 7% of CGIs. Both intra- and inter-genic CGIs undergo epigenetic modification, with the biggest increase in methylation occurring at the promoters of genes silenced by XCI. In contrast, genes escaping XCI generally have low levels of promoter methylation, while genes that show inter-individual variation in silencing show intermediate increases in methylation. Thus, promoter methylation and susceptibility to XCI are correlated. We also observed a global correlation between CGI methylation and the evolutionary age of X-chromosome strata, and that genes escaping XCI show increased methylation within gene bodies. We used our epigenetic map to predict 26 novel genes escaping XCI, and searched for parent-of-origin-specific methylation differences, but found no evidence to support imprinting on the human X chromosome. Our study provides a detailed analysis of the epigenetic profile of active and inactive X chromosomes.

Fate of nickel ion in (II-III) hydroxysulphate green rust synthesized by precipitation and coprecipitation

In order to investigate the efficiency of sulfate green rust (GR2) to remove Ni from solution, GR2 samples were synthesized under controlled laboratory conditions. Some GR2 samples were synthesized from Fe(II) and Fe(III) sulfate salts by precipitation. Other samples were prepared by coprecipitation, of Ni(II), Fe(II) and Fe(III) sulfate salts, i.e., in the presence of Ni. In another sample, Ni(II) sulfate salt was added to pre-formed GR2. After an initial X-ray diffraction (XRD) characterization all samples were exposed to ambient air in order to understand the role of Ni in the transformation of the GR2 samples. XRD was repeated after 45 days. The results showed that Nious GR2 prepared by coprecipitation is isomorphous to Ni-free GR2, i.e. Ni is incorporated into the crystalline structure. Fe(II) was not replaced by Ni(II) in the crystalline structure of GR2 formed prior to exposure to solution-phase Ni. This suggests Ni was adsorbed to the GR2 surface. Sulfate green rust is more efficient in removing Ni from the environment by coprecipitation.

Correlations between trabecular bone score, measured using anteroposterior dual-energy x-ray absorptiometry acquisition, and 3-dimensional parameters of bone microarchitecture: an experimental study on human cadaver vertebrae.

Developing a novel technique for the efficient, noninvasive clinical evaluation of bone microarchitecture remains both crucial and challenging. The trabecular bone score (TBS) is a new gray-level texture measurement that is applicable to dual-energy X-ray absorptiometry (DXA) images. Significant correlations between TBS and standard 3-dimensional (3D) parameters of bone microarchitecture have been obtained using a numerical simulation approach. The main objective of this study was to empirically evaluate such correlations in anteroposterior spine DXA images. Thirty dried human cadaver vertebrae were evaluated. Micro-computed tomography acquisitions of the bone pieces were obtained at an isotropic resolution of 93μm. Standard parameters of bone microarchitecture were evaluated in a defined region within the vertebral body, excluding cortical bone. The bone pieces were measured on a Prodigy DXA system (GE Medical-Lunar, Madison, WI), using a custom-made positioning device and experimental setup. Significant correlations were detected between TBS and 3D parameters of bone microarchitecture, mostly independent of any correlation between TBS and bone mineral density (BMD). The greatest correlation was between TBS and connectivity density, with TBS explaining roughly 67.2% of the variance. Based on multivariate linear regression modeling, we have established a model to allow for the interpretation of the relationship between TBS and 3D bone microarchitecture parameters. This model indicates that TBS adds greater value and power of differentiation between samples with similar BMDs but different bone microarchitectures. It has been shown that it is possible to estimate bone microarchitecture status derived from DXA imaging using TBS.

Reliure de : Georgii Agricolae de Ortu et causis subterraneorum lib. V. De natura eorum quae effluunt ex terra lib. IIII. De natura fossilium lib. X. De veteribus et novis metallis lib. II. Bermannus, sive de re metallica dialogus. Interpretatio germanica vocum rei metallicae...

Numérisation partielle de reliure

Ex XIIII. T. Livii Decadibus. Prima, tertia, quarta, in qua praeter fragmenta III, & X libri, quae in Germania nuper reperta, hic etiam continentur, multa adulterina expunximus, multa vera recepimus, quae in aliis non habentur. Epitome singulorum librorum XIIII Decadum. Historia omnium XIIII Decadum in compendium redacta ab L. Floro. Polybii lib. V de rebus Romanis latinitate donati à Nicolao Perotto. Index copiosissimus rerum omnium memorabilium...

[Histoire romaine (latin). 1518-1533]

Ex XIIII. T. Livii Decadibus. Prima, tertia, quarta, in qua praeter fragmenta III, & X libri, quae in Germania nuper reperta, hic etiam continentur, multa adulterina expunximus, multa vera recepimus, quae in aliis non habentur. Epitome singulorum librorum XIIII Decadum. Historia omnium XIIII Decadum in compendium redacta ab L. Floro. Polybii lib. V de rebus Romanis latinitate donati à Nicolao Perotto. Index copiosissimus rerum omnium memorabilium...

[Histoire romaine (latin). 1518-1533]