Eventos

Expositor: Dra. Andrea Kunder, CTIO.

Lugar: Sala de Conferencias Federico Ristenpart, Departamento de Astronomía. El Observatorio 1515 (Cerro Calán), Edificio Central, tercer piso, Las Condes.

Fecha: Jueves 23 de mayo, 16:00 hrs.

Contacto: Nicolas Alvarez / nalvarez@das.uchile.cl

Organiza: Departamento de Astronomía FCFM, U. de Chile.

Abstract: “Only for stars in the Milky Way is it currently possible to examine both the three dimensional kinematics and composition of a central bulge/bar population, offering a unique laboratory for the study of galaxy formation and evolution. I will present the results from the BRAVA spectroscopic survey of giants in the Galactic bulge, and how this database constrains dynamical models of the Galactic bulge and the formation of the Milky Way Galaxy”.

Lugar: Hotel The Ritz-Carlton, El Alcalde Nº 15, Las Condes, Santiago.

Fecha: Viernes 24 de mayo a las 8:30 hrs.

Contacto: Francisca López / frlopez@dii.uchile.cl

Organiza: Magíster en Gestión y Dirección de Empresas DII, FCFM, U. de Chile.

Más información en: http://www.dii.uchile.cl/eventos/inauguracion-ano-academico-tercera-vers...

Expositor: Juan Keymer

Lugar: Sala de seminarios DFI, Av Blanco Encalada 2008, 3er piso, Santiago.

Fecha: Viernes 24 de mayo, 16:00 hrs.

Contacto: Fernando Lund / flund@dfi.uchile.cl

Organiza: Deartamento de Física FCFM, U. de Chile.

Abstract: Conceptually, I will be talking about the basic notion of what is a population from the perspective of functional niche coherence among individuals (as suppose to being just a number density). Experimentally, I will show and discuss data of the colonization of a patchy ecosystem by two neutrally labeled, but otherwise isogenic, strains of Escherichia coli. One-dimensional arrays of habitat patches linked by connectors were inoculated at opposite ends by two fluorescently-labeled strains and studied by time-lapse microscopy. The habitats are colonized by a series of traveling waves followed by an expansion front. When colonization waves collide, they branch into a reflected wave, a stationary population, and a wave continuing in the same direction. Subsequent expansion fronts coming from opposite sides remain largely segregated in space and often one will displace the other from most of the habitat. Although all cultures are started from the same -80°C frozen stock, spatiotemporal colonization patterns in habitat replicas inoculated with cells from the same ancestral culture are significantly more similar to each other than to patterns in identical habitats inoculated with cells from different ancestral cultures. Cells coming from different ancestral monocultures do not mix in the habitat, while cells coming from a mixed ancestral co-culture colonize the habitat together and do not separate spatially. Using physically separated, but chemically coupled habitats we show that colonization waves and expansion fronts interact mostly through chemical fields. Together, our data show the crucial roles of inoculum ancestry and chemical coupling between cells in determining the outcome of habitat colonization.