Hubble Space Telescope WFC3 Early Release Science: Emission-Line Galaxies from Infrared Grism Observations

We present grism spectra of emission-line galaxies (ELGs) from 0.6-1.6 microns from the Wide Field Camera 3 on the Hubble Space Telescope. These new infrared grism data augment previous optical Advanced Camera for Surveys G800L 0.6-0.95 micron grism data in GOODS-South from the PEARS program, extending the wavelength covereage well past the G800L red cutoff. The ERS grism field was observed at a depth of 2 orbits per grism, yielding spectra of hundreds of faint objects, a subset of which are presented here. ELGs are studied via the Ha, [OIII], and [OII] emission lines detected in the redshift ranges 0.2<z<1.4, 1.2<z<2.2 and 2.0<z<3.3 respectively in the G102 (0.8-1.1 microns; R~210) and G141 (1.1-1.6 microns; R~130) grisms. The higher spectral resolution afforded by the WFC3 grisms also reveals emission lines not detectable with the G800L grism (e.g., [SII] and [SIII] lines). From these relatively shallow observations, line luminosities, star-formation rates, and grism spectroscopic redshifts are determined for a total of 48 ELGs to m(AB)~25 mag. Seventeen GOODS-South galaxies that previously only had photometric redshifts now have new grism-spectroscopic redshifts, in some cases with large corrections to the photometric redshifts (Delta(z)~0.3-0.5). Additionally, one galaxy had no previously-measured redshift but now has a secure grism-spectroscopic redshift, for a total of 18 new GOODS-South spectroscopic redshifts. The faintest source in our sample has a magnitude m(AB)=26.9 mag. The ERS grism data also reflect the expected trend of lower specific star formation rates for the highest mass galaxies in the sample as a function of redshift, consistent with downsizing and discovered previously from large surveys. These results demonstrate the remarkable efficiency and capability of the WFC3 NIR grisms for measuring galaxy properties to faint magnitudes and redshifts to z>2.Comment: Accepted for publication in AJ. Updated to include referee comments. Updated sample using improved reduction contains 23 new galaxies (Table 1; Figures 2 & 3

Comparative genome analysis of lignin biosynthesis gene families across the plant kingdom

<p>Abstract</p> <p>Background</p> <p>As a major component of plant cell wall, lignin plays important roles in mechanical support, water transport, and stress responses. As the main cause for the recalcitrance of plant cell wall, lignin modification has been a major task for bioenergy feedstock improvement. The study of the evolution and function of lignin biosynthesis genes thus has two-fold implications. First, the lignin biosynthesis pathway provides an excellent model to study the coordinative evolution of a biochemical pathway in plants. Second, understanding the function and evolution of lignin biosynthesis genes will guide us to develop better strategies for bioenergy feedstock improvement.</p> <p>Results</p> <p>We analyzed lignin biosynthesis genes from fourteen plant species and one symbiotic fungal species. Comprehensive comparative genome analysis was carried out to study the distribution, relatedness, and family expansion of the lignin biosynthesis genes across the plant kingdom. In addition, we also analyzed the comparative synteny map between rice and sorghum to study the evolution of lignin biosynthesis genes within the <it>Poaceae </it>family and the chromosome evolution between the two species. Comprehensive lignin biosynthesis gene expression analysis was performed in rice, poplar and <it>Arabidopsis</it>. The representative data from rice indicates that different fates of gene duplications exist for lignin biosynthesis genes. In addition, we also carried out the biomass composition analysis of nine <it>Arabidopsis </it>mutants with both MBMS analysis and traditional wet chemistry methods. The results were analyzed together with the genomics analysis.</p> <p>Conclusion</p> <p>The research revealed that, among the species analyzed, the complete lignin biosynthesis pathway first appeared in moss; the pathway is absent in green algae. The expansion of lignin biosynthesis gene families correlates with substrate diversity. In addition, we found that the expansion of the gene families mostly occurred after the divergence of monocots and dicots, with the exception of the C4H gene family. Gene expression analysis revealed different fates of gene duplications, largely confirming plants are tolerant to gene dosage effects. The rapid expansion of lignin biosynthesis genes indicated that the translation of transgenic lignin modification strategies from model species to bioenergy feedstock might only be successful between the closely relevant species within the same family.</p

L'INFECTION BANALE A GERMES ANAEROBIES OBSERVEE EN MILIEU HOSPITALIER

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Septicémies à bactéroides fragilis. Etude clinique et bactériologique

B. fragilis, an anaerobic normal inhabitant of the intestinal tract, is recovered from about 5% of bacteriologically proved bacteremias. Its high resistance to beta lactam antibiotics and to aminoglycosides accounts for its increasing importance in infectious diseases, particularly in patients with altered host defenses; in these subjects, B. fragilis may cause deadly superinfections.SCOPUS: NotDefined.jinfo:eu-repo/semantics/publishe

Données générales sur la recherche de sensibilité das bactéries anaerobies aux antibiotiques

SCOPUS: NotDefined.jinfo:eu-repo/semantics/publishe

Etude des germes anaerobies isolés des escarres de decubitus

Anaerobic bacteria are commonly isolated from necrotic decubitus ulcers. In patients suffering from such lesions, Bacteroides fragilis bacteremia occurs not infrequently.SCOPUS: NotDefined.jinfo:eu-repo/semantics/publishe

Etat actuel de la sensibilité des bactéries anaerobies aux antibiotiques

SCOPUS: NotDefined.jinfo:eu-repo/semantics/publishe

Isolation of actinomyces israelii in a case of gallbladder infection and comparison of identification methods

In a case of gallbladder infection, bacteriological studies revealed the presence of Actinomyces israelii, an organism rarely encountered in this site. While direct or indirect immunofluorescence techniques would undoubtedly provide the best identification criteria in the shortest time, the antisera were not available when the study was conducted. The most rapid technique for a tentative identification of isolated colonies of the strain was based upon detection of glycosidases together with catalase activity. Although not sufficient since A. israelii and A. naeslundii present the same enzymatic profiles, the other species and the most closely related genera can nevertheless be excluded by this method. Gas liquid chromatography - indeed useful yet much slower - contributes to identification but is not suitable for differentiation at the species level. Accurate identification was obtained by classical, time-consuming techniques. Distinguishing A. israelii from A. naeslundii ten days following pathogen isolation can only be of limited practical interest. © 1981 MMW Medizin Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Ostéite à Capnocytophaga ochracea

A strain belonging to the genus Capnocytophaga has been isolated from a bone abcess of a patient without any underlying factor. This strain exhibited the typical features of C. ochracca. The origin of this strain remains unknown. The clinical observation and the bacteriological findings are reported and commented in the present paper. © 1983.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Gastrite associée au Campylobacter pylori: Essai thérapeutique en double-insu amoxycilline versus placebo

A double-blind, placebo-controlled treatment study was performed in adults with antral gastritis associated with C. pylori. Patients received 20 ml of a placebo or an amoxycillin suspension (1g) two times daily for 8 days. Twenty-two patients received amoxycillin and twenty-three received a placebo. At the end of therapy 91 % (20/22) of patients treated with amoxycillin demonstrated clearance of the organism from the antrum compared to 16 % (4/23) in the placebo group (p < 0.001). Active antral gastritis resolved in 68 % (15/22) of patients in the amoxycillin group versus only 9 % (2/23) in the placebo group (p < 0.001). No significant improvement was observed in the assessment of clinical symptoms and endoscopic appearance. Reappearance of C. pylori and significant aggravation of the histological score was observed after 2 weeks in 100 % (19/19) of patients who demonstrated bacterial clearance after 8 days and had then received placebo for 14 days. Conversely, eighteen patients (not cleared from their bacteria after 8 days) received amoxycillin in single blind for 14 days. CLearance of bacteria associated with improvement or resolution of active gastritis was observed in 72 % (13/ 18) of patients. In this subgroup, 100 % (8/8) of patients observed at follow-up 1 month after stopping therapy were recolonized with C. pylori and again had histological active gastritis. These results indicate that amoxycillin suspension 2 g daily for 1 or 2 weeks is effective in treating active antral gastritis associated with C. pylori, but not in preventing relapses, which occur in all patients within one month after therapy. © 1987 Springer-Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe