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El límit per poder anunciar en paper seminaris i conferències en els ascensors és el divendres a les 12 hores de la setmana anterior. Amb posterioritat a aquesta data el seminari o conferència quedarà només recollit al web de la Facultat. Aleshores la publicitació en paper serà responsabilitat dels organitzadors.



Facultat de Física, Dilluns 25 de Febrer de 2019, a les 12:00h

Seminari de l'Institut de Ciències del Cosmos

Títol: Detailed chemical abundances from integrated-light observations of star clusters
Conferenciant: Soeren Larsen
Abstract:

From integrated-light spectroscopy of GCs and other massive star clusters, it is now possible to extend studies of the chemical composition of stellar populations far beyond the few nearby galaxies where individual stars can be measured in detail. I will discuss results from our work on the detailed chemistry of GCs in Local Group galaxies and beyond, and look ahead to future applications of this technique with 30-40 m class telescopes that will allow detailed abundance studies in a representative sample of galaxies in the nearby Universe. One noteworthy result so far is a clear demonstration that GCs in dwarf galaxies are, on average, more metal-poor than those in larger galaxies, and that a large fraction of the most metal-poor stars in dwarf galaxies tend to belong to GCs. The GC spectra show the signatures of Na and Mg abundance anomalies that are widespread also in Galactic GCs. This has important implications for scenarios that invoke heavy cluster mass loss to account for the large fractions of enriched "second-generation" stars in GCs, as well as for GC disruption and its contribution to the field star populations in halos in general.

Lloc: Seminari DAM
Contacte: secretariacientifica@icc.ub.edu
Web: http://icc.ub.edu/activity/1306

Facultat de Física, Dimarts 26 de Febrer de 2019, a les 12:00h

Seminari del Dep. de Física de la Matèria Condensada

Títol: The temporal scaling of C. elegans ageing
Conferenciant: Nicholas Stroustrup (CRG)
Abstract:

Aging produces a wide distribution of lifespan even among isogenic individuals housed in controlled environments. Analyzing high-resolution demographic data collected using our automated method, we find that diverse interventions in aging alter C. elegans lifespan of through an apparent stretching or shrinking of time: a temporal scaling of the survival curve. Interventions producing this effect include changes in diet and temperature, exposure to oxidative stress, and the disruption of genes including the insulin/IGF-1 pathway components daf-2.
In certain cases, a temporal scaling of survival curves is statistically indistinguishable from several other parametric models previously proposed to describe the quantitative effect of interventions in aging. So, to differentiate between these models, we investigated the effect of transient interventions applied early in adulthood. We observed that early-adulthood changes in temperature produce temporal shifts of the survival curve, distinct from the temporal scaling produced by whole-life exposure. The magnitudes of these shifts were accurately predicted by a model in which interventions produce a temporal scaling of a single aging process during any period of exposure, in which the rate of all physiologic changes influencing lifespan are altered in concert.
Clearly, the interventions we characterize produce diverse changes at molecular level and differential effects across various “health-span” phenotypes. It is therefore surprising to see all the physiologic determinants of lifespan, whatever they may be, appearing to respond in such a uniform way across many interventions. In a series of simulations, we find that temporal scaling can arise as a general behavior of complex networks, in which the interdependence of components serves to propagate the consequences of declines in functions of small sub-networks across the whole network. Perhaps such network phenomena may help explain other aspects of aging, and provide the basis for an empirically-grounded, quantitative framework that links molecular interventions to their systemic effects in aging.

Lloc: Aula Seminari 3.20
Contacte: fritort@gmail.com
Web: http://ffn.ub.es/ritort/news-activities

Facultat de Física, Divendres 01 de Març de 2019, a les 12:00h

Seminari de l'Institut de Nanociència i Nanotecnologia

Títol: Marker-free monitoring of cells and tissues
Conferenciant: Dra. Katja Schenke-Layland (University of Tübingen, Germany)
Abstract:

As the field of regenerative and personalized medicine matures, the need for novel enabling technologies to characterize cells and engineered constructs (i.e. cells/tissue combined with scaffolds and/or growth factors) as well as their individual components in a more insightful, quantitative and preferably non-invasive manner becomes imperative. Raman microspectroscopy is an emerging technique based on light scattering that allows assessing molecular interactions and the biochemical structure of a sample in a non-invasive manner. Specifically for tissue engineering applications, it has been proven to allow determining biochemical information on cells, tissues and/or material-cell tissue constructs without the need for labels.
The aim of the presentation is to show the applicability of Raman microspectroscopy for regenerative and personalized medicine applications and disease monitoring, and to discuss the added value of the generated data for tissue engineering construct design optimization and preclinical as well as clinical applications.

Lloc: Sala de Graus Eduard Fontseré
Contacte: isaborit@ub.edu
Web: http://www.ub.edu/in2ub/files/IN2UB_IRS_01_03_2019.pdf

Facultat de Física, Divendres 05 de Abril de 2019, a les 12:00h

Seminari de l'Institut de Ciències del Cosmos

Títol: A Two-Higgs-Doublet-Model for muon g-2 and dark matter
Conferenciant: Eung Jin Chun (Korea Institute for Advanced Study)
Abstract:

Although the Higgs boson found at the LHC is consistent with the minimal Higgs sector the Standard Model, there might exist additional Higgs bosons and thus various aspects of the extended Higgs sector have been studied extensively. Motivated by the observed anomaly of muon g-2, we will consider a specific type of two Higgs doublet models (called type-X) to explore its favored parameter space and prospects of finding the extra Higgs bosons at the LHC. In addition, we will discuss the properties of Higgs-portal dark matter in this context.

Lloc: Aula Pere Pascual 507
Contacte: secretariacientifica@icc.ub.edu
Web: http://icc.ub.edu/activity/1315