14 research outputs found
Variations in the 6.2 m emission profile in starburst-dominated galaxies: a signature of polycyclic aromatic nitrogen heterocycles (PANHs)?
Analyses of the polycyclic aromatic hydrocarbon (PAH) feature profiles,
especially the 6.2 m feature, could indicate the presence of nitrogen
incorporated in their aromatic rings. In this work, 155 predominantly
starburst-dominated galaxies (including HII regions and Seyferts, for example),
extracted from the Spitzer/IRS ATLAS project (Hern\'an-Caballero &
Hatziminaoglou 2011), have their 6.2 m profiles fitted allowing their
separation into the Peeters' A, B and C classes (Peeters et al. 2002). 67% of
these galaxies were classified as class A, 31% were as class B and 2% as class
C. Currently class A sources, corresponding to a central wavelength near 6.22
m, seem only to be explained by polycyclic aromatic nitrogen heterocycles
(PANH, Hudgins et al. 2005), whereas class B may represent a mix between PAHs
and PANHs emissions or different PANH structures or ionization states.
Therefore, these spectra suggest a significant presence of PANHs in the
interstellar medium (ISM) of these galaxies that could be related to their
starburst-dominated emission. These results also suggest that PANHs constitute
another reservoir of nitrogen in the Universe, in addition to the nitrogen in
the gas phase and ices of the ISM
Comment on "Ab initio calculations of the lattice parameter and elastic stiffness coefficients of bcc Fe with solutes" Comp. Mat. Sci. v.126 pp.503-513 (2017)
In a recent paper, the authors propose to separately calculate the volumetric
and chemical contributions to the elastic stiffness coefficients of systems
containing solutes, as it is "computationally more efficient". We show that
this is not the case and further that their methodology and hence their results
are incorrect. There is no short cut for performing the desired calculations,
if done rigorously, as we show in our 2012 work
Additional file 13: Table S11. of Links of gut microbiota composition with alcohol dependence syndrome and alcoholic liver disease
Associations between the levels of gut microbial genera and clinical factors. The table contains the coefficients of linear model obtained by applying MaAsLin method to the reference-mapping based taxonomic composition vectors (adjusted p-value < 0.05). Positive values denote direct association between the factor and the relative abundance of the respective taxon, while negative values denote reverse association. Each empty cell denotes that no significant association was detected between the respective factor and taxon. (XLSX 8 kb
Le Monde
06 septembre 18711871/09/06 (N117,A12).Appartient à l’ensemble documentaire : BbLevt
Additional file 18: Table S16. of Links of gut microbiota composition with alcohol dependence syndrome and alcoholic liver disease
Virulence factors genes with increased abundance in ALC patients in comparison with the control group. (XLSX 12 kb
Additional file 11: Table S10. of Links of gut microbiota composition with alcohol dependence syndrome and alcoholic liver disease
Bacterial species differentially abundant between each of the ADS and ALC groups and the control group (for the composition obtained via MetaPhlAn2). (XLSX 10 kb
Additional file 12: Figure S2. of Links of gut microbiota composition with alcohol dependence syndrome and alcoholic liver disease
Pairwise dissimilarity of the gut metagenomes of the ADS, ALC and control groups obtained using MetaFast algorithm (Wardâs linkage, Bray-Curtis metric). (PDF 228 kb
Additional file 16: Table S14. of Links of gut microbiota composition with alcohol dependence syndrome and alcoholic liver disease
Metabolic pathways differentially abundant in ADS patients in comparison with the control group. (XLSX 8 kb
Additional file 15:Table S13. of Links of gut microbiota composition with alcohol dependence syndrome and alcoholic liver disease
Metabolic pathways differentially abundant in ALC patients in comparison with the control group. (XLSX 8 kb
Additional file 7: Figure S1. of Links of gut microbiota composition with alcohol dependence syndrome and alcoholic liver disease
Heatmap displaying the relative abundance of the major microbial species for the gut metagenomes of ADS and ALC patients. Only the species with the abundance of >5% in at least one sample are shown. (PDF 115 kb