Actividad de investigación científica con alumnos de nivel medio : un estudio de caso

El trabajo presenta una actividad de investigación científica sobre el tema Cama de Faquir, realizada con alumnos de nivel medio (15 y 17 años) de una escuela estatal, y desarrollado en partes entre la universidad y la escuela. Los alumnos proyectaron la cama de faquir, la construyeron, y estudiaron la presión que un globo soporta sobre ella sin explotar. Participaron activamente en el proceso de aprendizaje y se familiarizaron con la investigación científica. Cambiaron sus concepciones inicial simplista por una más próxima a la realidad sobre la naturaleza de la investigación y empezaron a utilizar con más frecuencia términos científicos. El hecho de que el trabajo fuera en su mayoría desarrollado en el ambiente universitario, ayudó a los alumnos a desmitificar la universidad, proporcionándoles nuevas perspectivas en sus vidas profesionales

1.65 micrometers (H-band) surface photometry of galaxies. III: observations of 558 galaxies with the TIRGO 1.5m telescope

We present near-infrared H-band (1.65 micron) surface photometry of 558 galaxies in the Coma Supercluster and in the Virgo cluster. This data set, obtained with the Arcetri NICMOS3 camera ARNICA mounted on the Gornergrat Infrared Telescope, is aimed at complementing, with observations of mostly early-type objects, our NIR survey of spiral galaxies in these regions, presented in previous papers of this series. Magnitudes at the optical radius, total magnitudes, isophotal radii and light concentration indices are derived. We confirm the existence of a positive correlation between the near-infrared concentration index and the galaxy H-band luminosity. (Tables 1 and 2 are only available in electronic form upon request to [email protected])Comment: 12 pages, 6 figures. Accepted for publication in A&A

Near-infrared observations of galaxies in Pisces-Perseus: I. H-band surface photometry of 174 spirals

We present near-infrared, H-band (1.65 um), surface photometry of 174 spiral galaxies in the area of the Pisces-Perseus supercluster. The images, acquired with the ARNICA camera mounted on various telescopes, are used to derive radial profiles of surface brightness, ellipticities, and position angles, together with global parameters such as H-band magnitudes and diameters. The mean relation between H-band isophotal diameter D_{21.5} and the B-band D_{25} implies a B-H color of the outer disk bluer than 3.5; moreover, D_{21.5}/D_{25} depends on (global) color and absolute luminosity. The correlations among the various photometric parameters suggest a ratio between isophotal radius D_{21.5}/2 and disk scale length of about 3.5 and a mean disk central brightness of 17.5 H-mag arcsec^{-2}. We confirm the trend of the concentration index C_{31} with absolute luminosity and, to a lesser degree, with morphological type. We also assess the influence of non-axisymmetric structures on the radial profiles and on the derived parameters.Comment: 10 pages, 11 postscript figures (one table and one figure are available only at the CDS); to be published on A&A

Single-incision laparoscopic adnexectomy in an obese patient with previous laparotomies

No case of single-incision laparoscopic surgery in obese patients who had previously undergone multiple midline vertical laparotomies has been described in the literature to date. Hence we report the first case of single-port laparoscopic salpingo-oophorectomy in an obese patient who was affected by a left adnexal mass and who had previously undergone 3 midline vertical laparotomies

Targeted therapies in the management of metastatic bladder cancer

The management of metastatic urothelial carcinoma (UC) of the bladder is a common and complex clinical challenge. Despite the fact that UC is one of the most frequent tumors in the population, long term survival for metastatic disease remains low, and chemotherapy is curative for only a small minority of patients. UC is genetically heterogeneous, and it is surrounded by a complex tissue microenvironment. The problems of clinical practice in the field of metastatic bladder cancer have begun to stimulate translational research. Advances in the understanding of the molecular biology of urothelial cancer continue to contribute to the identification of molecular pathways upon which new therapeutic approaches can be targeted. New agents and strategies have recently been developed which can direct the most appropriate choice of treatment for advanced disease. A review of literature published on the targeted therapy for metastatic bladder cancer is presented, focusing on the molecular pathways shut down by the new therapeutic agents

Transmission curves and effective refraction indices of MKO near infrared consortium filters at cryogenic temperatures

We report transmission measurements at cryogenic temperatures for 4 broad-band filters of the Mauna Kea Observatories (MKO) near-infrared filter set and 5 narrow-band filters. The spectral scans were collected using the multi-mode IR instrument of the TNG telescope (NICS) in which these filters are permanently mounted and commonly used for astronomical observations. We determined the transmission curves at a temperature of 78K and found no significant red-leak up to 2.6 microns, the data are available in electronic form on the TNG web page. We also estimated the variation of the wavelength response with the incidence angle and found it compatible with an effective refractive index of about 2

Determination of the antimicrobial susceptibility pattern of enterobacteriaceae in a tertiary health center of Northeastern Nigeria.

Gram negative resistance particularly amongst species of has emerged as a worldwide threat affecting the efficacy of our commonly used antimicrobial agents. These threats affect the quality of care and results in prolonged hospitalization and increase in health care cost. We set out to evaluate the occurrence and profile of antimicrobial resistance from clinical isolates of in a tertiary health center of north-eastern, Nigeria. Method: Confirmed species of isolated from 225 patients that were admitted in various units of University of Maiduguri Teaching Hospital (UMTH) Maiduguri were tested for susceptibility to 6 antimicrobial agents; ampicillin (10µg), aztreonam (30µg), gentamicin (10µg), ceftriaxone (30µg), ciprofloxacin (5µg) and amoxicillin/clavulanic acid (20/10µg) using the clinical and laboratory standards institute (CLSI) breakpoints. Results: A total of 225 clinical variants of were isolated during the study period. The specie with the highest proportion was with 73(32.4%) and this was followed closely by with 61(27.1%). The result of the susceptibility testing on this species of showed ampicillin (10µg) with the highest resistance of 118(52.4%) while aztreonam(30µg) has the lowest resistance of 58(25.8%). Conclusion: There is the existence of widespread resistance to mostly the beta lactam agents among species of with the exception of Aztreonam. Irrational use of antibiotics must be discouraged so as to reduce this emerging threat. Stringent infection control and antibiotic stewardship programshould be established and sustained in our hospitals nationwide

Exploring Brown Dwarf Disks in rho Oph

This paper discusses evidence for and properties of disks associated to brown dwarfs in the star-forming region rho-Oph. We selected nine objects fr om the ISOCAM survey of Bontemps et al. (2001) that have detections in the two mid-infrared bands (6.7 and 14.3 um), relatively low extinction and low luminosity. We present low-resolution near-infrared spectra in the J, H and K bands, and determine for each source spectral type, extinction, effective temperature a nd luminosity by comparing the spectra to those of field dwarfs and to the most recent model stellar atmospheres. The results indicate that eight objects have spectral types M6-M7.5, effective temperature of 2600-2700 K, one has a later spectral type (M8.5) and lower temperature (about 2400 K). The derived extinctions range between Av~2 and 8 mag. The location of the objects on the HR diagram, in spite of the uncertainties of the evolutionary tracks for young objects of substellar mass, indicates that all the objects are very young and have masses below about 0.08 Msun. The coolest object in our sample has mass in the range 8-12 Mjup (0.008-0.012 Msun). In all cases, the mid-infrared excess is consistent with the predictions of mode ls of disks irradiated by the central object, showing that circumstellar disks are commonly associated to young brown dwarfs and plan etary-mass objects. Finally, we discuss possible variations of the disk geometry among different objects, as well as the possibility of using these data to discriminate between various f ormation scenarios.Comment: 15 pages, A&A in press, full resolution color figures for appendix A and B are available at http://www.arcetri.astro.it/~lt/preprints/preprints.htm

Actividad de investigación científica con alumnos de nivel medio : un estudio de caso

El trabajo presenta una actividad de investigación científica sobre el tema Cama de Faquir, realizada con alumnos de nivel medio (15 y 17 años) de una escuela estatal, y desarrollado en partes entre la universidad y la escuela. Los alumnos proyectaron la cama de faquir, la construyeron, y estudiaron la presión que un globo soporta sobre ella sin explotar. Participaron activamente en el proceso de aprendizaje y se familiarizaron con la investigación científica. Cambiaron sus concepciones inicial simplista por una más próxima a la realidad sobre la naturaleza de la investigación y empezaron a utilizar con más frecuencia términos científicos. El hecho de que el trabajo fuera en su mayoría desarrollado en el ambiente universitario, ayudó a los alumnos a desmitificar la universidad, proporcionándoles nuevas perspectivas en sus vidas profesionales