60,600 research outputs found
Intra-group diffuse light in compact groups of galaxies. HCG 79, HCG 88 and HCG 95
Deep and images of three Hickson Compact Groups, HCG 79, HCG 88 and
HCG 95, were analyzed using a new wavelet technic to measure possible
intra-group diffuse light present in these systems. The method used, OV\_WAV,
is a wavelet technic particularly suitable to detect low-surface brightness
extended structures, down to a per pixel, which corresponds to a
5--detection level in wavelet space. The three groups studied are in
different evolutionary stages, as can be judged by their very different
fractions of the total light contained in their intra-group halos: %
for HCG 79 and % for HCG 95, in the band, and HCG 88 had no
component detected down to a limiting surface brightness of . For HCG 95 the intra-group light is red, similar to the mean
colors of the group galaxies themselves, suggesting that it is formed by an old
population with no significant on-going star formation. For HCG 79, however,
the intra-group material has significantly bluer color than the mean color of
the group galaxies, suggesting that the diffuse light may, at least in part,
come from stripping of dwarf galaxies which dissolved into the group potential
well.Comment: Two suggested references added to the introductio
Lactobacillus crispatus as the etiological agent in cytolytic vaginosis
Introduction: Lactobacillus spp. dominate the vaginal niche but can also be involved in other vaginal dysbiosis, such as cytolytic vaginosis (CV), which remains poorly studied. It is characterized by a cryptic symptomatology, that often confounds the clinic.
Goals: The aim of this work was to search for the etiological agent of CV, by studying the vaginal microbiome and metabolomics of women afflicted with this disease and compare it with women with other clinical diagnostic.
Methods: Twenty-one vaginal washes have been collected from women attending a gynaecology consultation of a private clinic. The samples were categorized according with clinical diagnosis at the time of sampling (CV, 11; vulvovaginal candidosis, 8; Healthy, 2). The distribution of bacterial species, and their prevalence was assessed by next-generation sequencing of the 16S V4 region. In addition, total lactate D-lactic acid and L-lactic acid was quantified in all washes by a commercial kit, as well as lactate dehydrogenase (LDH) activity.
Results: L. crispatus was dominant (>70%) in all CV samples. Lactate was increased in CV in comparison with other cases. The presence of D-lactic acid isomer was associated with presence of L. crispatus. LDH activity was increased in vaginal washes that tested positive for the presence of L. crispatus, however no direct association was found with CV cases.
Discussion/Conclusions: The microbiome of women afflicted with CV was dominated in all cases by L. crispatus, contrarily with the results obtained for women diagnosed with other clinical symptomatology. In addition, the finding that an increase in D-lactic acid is associated with CV patients can be related to the role of L. crispatus in CV. The determination of LDH activity did not correlate exclusively with CV cases. On the other hand, D-lactic acid and total lactate quantification could be used as a valuable biomarker to diagnose this cryptic vaginal infection.info:eu-repo/semantics/publishedVersio
Interplay between structure and density anomaly for an isotropic core-softened ramp-like potential
Using molecular dynamics simulations and integral equations we investigate
the structure, the thermodynamics and the dynamics of a system of particles
interacting through a continuous core- softened ramp-like interparticle
potential. We found density, dynamic and structural anomalies similar to that
found in water. Analysis of the radial distribution function for several
temperatures at fixed densities show a pattern that may be related to the
origin of density anomaly.Comment: 7 pages, 3 figure
Nonzero Classical Discord
Quantum discord is the quantitative difference between two alternative
expressions for bipartite mutual information, given respectively in terms of
two distinct definitions for the conditional entropy. By constructing a
stochastic model of shared states, classical discord can be similarly defined,
quantifying the presence of some stochasticity in the measurement process.
Therefore, discord can generally be understood as a quantification of the
system's state disturbance due to local measurements, be it quantum or
classical. We establish an operational meaning of classical discord in the
context of state merging with noisy measurement and thereby show the
quantum-classical separation in terms of a negative conditional entropy.Comment: Replaced by the published versio
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