434 research outputs found
The anatomy of urban social networks and its implications in the searchability problem
The appearance of large geolocated communication datasets has recently
increased our understanding of how social networks relate to their physical
space. However, many recurrently reported properties, such as the spatial
clustering of network communities, have not yet been systematically tested at
different scales. In this work we analyze the social network structure of over
25 million phone users from three countries at three different scales: country,
provinces and cities. We consistently find that this last urban scenario
presents significant differences to common knowledge about social networks.
First, the emergence of a giant component in the network seems to be controlled
by whether or not the network spans over the entire urban border, almost
independently of the population or geographic extension of the city. Second,
urban communities are much less geographically clustered than expected. These
two findings shed new light on the widely-studied searchability in
self-organized networks. By exhaustive simulation of decentralized search
strategies we conclude that urban networks are searchable not through
geographical proximity as their country-wide counterparts, but through an
homophily-driven community structure
Physical activity quantification in elder women
Cuantificación de la actividad física en mujeres mayores
The CaT strength in Seyfert nuclei revisited: analyzing young stars and non-stellar light contributions to the spectra
In a former paper (Garcia-Rissmann et al. 2005; hereafter Paper I), we have
presented spectra of 64 active, 9 normal and 5 Starburst galaxies in the region
around the near-IR Calcium triplet absorption lines and the [SIII]9069 line. In
the present paper we analyze the CaT strength (WCaT), and kinematical products
derived in that study, namely stellar and ionized gas velocity dispersions. Our
main results may be summarized as follows: (1) Seyfert 2s show no sign of
dilution in WCaT with respect to the values spanned by normal galaxies, even
when optical absorption lines such as the CaII K band at 3933 A are much weaker
than in old, bulge-like stellar populations. (2) The location of Seyfert 2s in
the WCaT-WCaK plane is consistent with evolutionary synthesis models. The
implication is that the source responsible for the dilution of optical lines in
these AGN is a young stellar population, rather than an AGN featureless
continuum, confirming the conclusion of the pioneer study of Terlevich, Diaz &
Terlevich. (3) In Seyfert 1s, both W[SIII] and WCaT tend to be diluted due to
the presence of a non-stellar component, in agreement with the unification
paradigm. (4) A comparison of stellar and gas velocity dispersions confirms the
existence of a correlation between the typical velocities of stars and clouds
of the Narrow Line Region. The strength and scatter around this correlation are
similar to those previously obtained from the [OIII]5007 line width.Comment: 14 pages, 15 figures. Paper accepted for publication in MNRA
Mass-metallicity relation explored with CALIFA I. Is there a dependence on the star-formation rate?
We studied the global and local M-Z relation based on the first data available from the CALIFA survey (150 galaxies). This survey provides
integral field spectroscopy of the complete optical extent of each galaxy (up to 2−3 effective radii), with a resolution high enough to separate
individual Hii regions and/or aggregations. About 3000 individual Hii regions have been detected. The spectra cover the wavelength range
between [OII]3727 and [SII]6731, with a sufficient signal-to-noise ratio to derive the oxygen abundance and star-formation rate associated with
each region. In addition, we computed the integrated and spatially resolved stellar masses (and surface densities) based on SDSS photometric data.
We explore the relations between the stellar mass, oxygen abundance and star-formation rate using this dataset.
We derive a tight relation between the integrated stellar mass and the gas-phase abundance, with a dispersion lower than the one already reported
in the literature (σΔlog (O/H) = 0.07 dex). Indeed, this dispersion is only slightly higher than the typical error derived for our oxygen abundances.
However, we found no secondary relation with the star-formation rate other than the one induced by the primary relation of this quantity with
the stellar mass. The analysis for our sample of ∼3000 individual Hii regions confirms (i) a local mass-metallicity relation and (ii) the lack of a
secondary relation with the star-formation rate. The same analysis was performed with similar results for the specific star-formation rate.
Our results agree with the scenario in which gas recycling in galaxies, both locally and globally, is much faster than other typical timescales, such
like that of gas accretion by inflow and/or metal loss due to outflows. In essence, late-type/disk-dominated galaxies seem to be in a quasi-steady
situation, with a behavior similar to the one expected from an instantaneous recycling/closed-box model.Nacional de Investigación y Desarrollo funding programs of the Spanish Ministerio de Ciencia e Innovación
AYA2010-22111-C03-03
AYA2010-10904ERamon y Cajal project of the spanish Ministerio de Economía y Competitividad
RyC-2011-07590Academy of Sciences of the Czech Republic (ASCR Internal support program of international cooperation projects-PIPPMS)
M100031241
M100031201Czech Republic program for the long-term development of the research institution
RVO67985815Plan Nacional de Investigación y Desarrollo funding program
AYA2010-15081Consejo Nacional de Ciencia y Tecnología (CONACyT)Spanish grant
AYA2010-15169Junta de Andalucía
TIC114Excellence Project
P08-TIC-03531Consejo Superior de Investigaciones Científicas (CSIC)Junta para la Ampliación de EstudiosEuropean Social Fund (ESF)spanish programme of International Campus of Excellence MoncloaSpanish PNAYA
AYA2010-21887Spanish Government
CSD2006-00070
AYA2012-38491-C02-02Junta de Andalucía
TIC114Autonomic Government of Andalusia
P08-TIC-4075
TIC-126CienciaPortuguese Foundation for Science and TechnologyEuropean Commission
European Commission Joint Research Centre
European Social Fund (ESF)Portuguese Foundation for Science and Technology
SFRH/BPD/66958/2009National Science Foundation (NSF
Cambios epigenéticos en ápices crioconservados de Mentha xpiperita
La crioconservación ofrece una serie de ventajas sobre otros métodos para la conservación a largo plazo del germoplasma de especies de propagación vegetativa. En comparación con la conservación in vitro tiene la ventaja de reducir los posibles cambios genéticos que pueden ocurrir
Assessment of humoral immune response to two mRNA SARS-CoV-2 vaccines (Moderna and Pfizer) in healthcare workers fully vaccinated with and without a history of previous infection
Aims: Presence of anti-S1 region of SARS-CoV-2 spike protein was analysed, at two and eight months, in 477 immunocompetent healthcare workers in Zaragoza, Spain, vaccinated with mRNA-1273 (Moderna) or BNT162b2 (Pfizer). Methods and results: Antibody analysis was performed with Alinity i System (Abbott). At 2 months, 100% of vaccinated had anti-S1 IgG (mean = 13, 285 AU ml-1). This value was significantly higher with Moderna (18, 192 AU ml-1) than with Pfizer (10, 441 AU ml-1). The mean value of anti-S1 IgG after vaccination was significantly higher in patients with than without previous infection (18, 539 vs. 7919 AU ml-1); in both groups was significantly higher with Moderna than with Pfizer (21, 881 vs. 15, 733 AU ml-1 and 11, 949 vs. 6387 AU ml-1), respectively. At 8 months, 100% of patients were IgG positive, with higher levels with Moderna than with Pfizer. Nevertheless, in ensemble of cases, a mean decrease of antibody levels of 11, 025 AU ml-1 was observed. Conclusion: At 2 and 8 months after vaccination, IgG response persists with both vaccines but with important decrease which suggests the need for revaccination. Significance and impact of study: The study contributes to know the immune status after vaccination with two of more used anti-SARS-CoV-2 vaccines. This knowledge is important for establishing the best vaccination strategy. © 2022 The Authors. Journal of Applied Microbiology published by John Wiley & Sons Ltd on behalf of Society for Applied Microbiology
Comparative study of the use of Doxycycline and Oxytetracycline to treat Anaplasmosis in fattening lambss
Lamb icteric carcasses condemnation due to Anaplasma ovis is causing relevant economic losses. A comparative study was developed on the effects of different antibiotics to treat ovine anaplasmosis in fattening lambs. A total of 100 A. ovis naturally infected lambs were selected and randomly divided into four groups of 25 lambs: Group ID, treated with injectable doxycycline; Group OD, oral doxycycline; Group O, injectable oxytetracycline; and Group C, untreated animals for the control group. Clinical, haematological, and molecular analyses were performed before the treatment and 12 and 45 days after the beginning of the treatments, and carcass condemnation was followed after slaughter. The A. ovis bacterial load was high before the treatments in the four groups and decreased significantly 45 days after treatment in the ID and O Groups (p < 0.001). The parameters that were related to haemolysis showed similar results. At the abattoir, 15 out of the 47 examined carcasses were condemned; 7 of C Group, 6 of OD Group, 2 of O Group, and 0 of ID Group. It can be concluded that injectable doxycycline and oxytetracycline significantly reduce A. ovis bacterial load in blood and carcass condemnation at the abattoir. Further studies are needed in order to confirm these encouraging findings
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