On the lack of stellar bars in Coma dwarf galaxies

We present a study of the bar fraction in the Coma cluster galaxies based on a sample of ~190 galaxies selected from the SDSS-DR6 and observed with the Hubble Space Telescope (HST) Advanced Camera for Survey (ACS). The unprecedented resolution of the HST-ACS images allows us to explore the presence of bars, detected by visual classification, throughout a luminosity range of 9 mag (-23 < M_r < -14), permitting us to study the poor known region of dwarf galaxies. We find that bars are hosted by galaxies in a tight range of both luminosities (-22 < M_r < -17) and masses (10^9 < M*/Msun < 10^11). In addition, we find that the bar fraction does not vary significantly when going from the center to the cluster outskirts, implying that cluster environment plays a second-order role in bar formation/evolution. The shape of the bar fraction distribution with respect to both luminosity and mass is well matched by the luminosity distribution of disk galaxies in Coma, indicating that bars are good tracers of cold stellar disks.Comment: 2 pages, 1 figure, to appear in the proceedings of the conference "A Universe of Dwarf Galaxies" (Lyon, June 14-18, 2010

Neoadjuvant endocrine therapy for luminal breast cancer treatment: a first-choice alternative in times of crisis such as the COVID-19 pandemic

The epidemiological emergency caused by CoV-2 (COVID-19) has changed priorities in breast cancer management. In those places where the pandemic has had the greatest effect, it is of paramount importance for most patients to be at home, reducing or postponing their attendance at clinics, as well as avoiding surgeries. In this scenario, neoadjuvant endocrine treatment could be an appropriate alternative treatment for hormone receptor positive breast cancer (luminal-like tumours) in order to minimise hospital admissions and to delay elective surgeries. Accordingly, we present a simple protocol that can be applied to most cases of luminal-like breast cancer and is appropriate for the majority of secondary or tertiary medical centres, or even primary car

Vicente Fox, ¿una pausa en la transición a la democracia?

Crítica a la figura, desempeño, gabinete y gobierno de Vicente Fox Quezada.ITESO, A.C

Tareas pendientes de la democracia

Es probable que la novedad política del primer semestre de 1999 sea precisamente el movimiento de políticos y partidos con vistas a la elección presidencial de 2000, a pesar de que en la tradición mexicana esto venía ocurriendo en el segundo semestre del año anterior a la elección. Aunque era común que se comenzaran a mencionar, desde tiempo atrás, los nombres de los posibles candidatos, así como los procedimientos para seleccionarlos, no era sino hasta fin de año cuando este proceso se intensificaba.ITESO, A.C

El respeto a los derechos humanos de los pueblos indígenas, tarea pendiente de la democracia. La búsqueda de una alternativa por la vía del consenso y la autolimitación

Ensayo dividido en tres partes. En la primera se describen las necesidades que los derechos humanos de los pueblos indígenas podrían satisfacer; en la segunda se analiza el problema de los derechos indígenas con la intención de mostrar que no se trata de una nueva preocupación, y en la tercera se hace un análisis crítico de las posibilidades de lograr un consenso que conduzca al cumplimiento de algunos derechos indígenas.ITESO, A.C

Riesgo e incertidumbre en el gobierno de Vicente Fox

Ensayo compuesto en tres apartados: El tercer entorno: del México real al México de criterio empresarial; Los riesgos de la globalización, e Incertidumbre, riesgo y arrogancia: la ofensiva neoconservadora del gobierno foxista.ITESO, A.C

Absorption and Direct Processes in Chaotic Wave Scattering

Recent results on the scattering of waves by chaotic systems with losses and direct processes are discussed. We start by showing the results without direct processes nor absorption. We then discuss systems with direct processes and lossy systems separately. Finally the discussion of systems with both direct processes and loses is given. We will see how the regimes of strong and weak absorption are modified by the presence of the direct processes.Comment: 8 pages, 4 figures, Condensed Matter Physics (IV Mexican Meeting on Mathematical and Experimental Physics), Edited by M. Martinez-Mares and J. A. Moreno-Raz

La presidencia del señor Vicente Fox

Análisis político sobre la transición en el país con el fin de sexenio de Ernesto Zedillo, las críticas de su antecesor, Carlos Salinas de Gortari, y las promesas de campaña y los claroscuros del nuevo presidente: Vicente Fox.ITESO, A.C