229 research outputs found
Presence of New Delhi metallo-ÎČ-lactamase gene (NDM-1) in a clinical isolate of Acinetobacter junii in Argentina
Here we report the presence of a clinically significant A. junii blaNDM-1 positive in a 38-year-old woman who was admitted to the emergency department with a fever and leg ulcers with signs of infection. The NDM-1 carbapenemase has been dramatically spread among Gram-negative bacilli, thus imposing a new challenge on the health system to fight bacterial infections.These data expand the number of Acinetobacter species harbouring blaNDM-1. The wide existence of Acinetobacter harbouring and dispersing this carbapenemase emphasizes the importance of non-previously recognized pathogens as reservoirs of dangerous resistance determinants. These resistance determinants can be later easily transferred to other menacing pathogens.Fil: Montaña, Sabrina Daiana. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Houssay. Instituto de Investigaciones en MicrobiologĂa y ParasitologĂa MĂ©dica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en MicrobiologĂa y ParasitologĂa MĂ©dica; ArgentinaFil: Cittadini, Roxana. Sanatorio Mater Dei; ArgentinaFil: Del Castillo M,. Sanatorio Mater Dei; ArgentinaFil: Uong, S.. California State University; Estados UnidosFil: Lazzaro, T.. California State University; Estados UnidosFil: Almuzara, Marisa. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentina. Universidad de Buenos Aires. Facultad de Farmacia y BioquĂmica. Departamento de BioquĂmica ClĂnica; Argentina. Universidad de Buenos Aires. Facultad de Medicina. Hospital de ClĂnicas General San MartĂn; ArgentinaFil: Barberis, Claudia. Sanatorio Mater Dei; Argentina. Universidad de Buenos Aires. Facultad de Farmacia y BioquĂmica. Departamento de BioquĂmica ClĂnica; Argentina. Universidad de Buenos Aires. Facultad de Medicina. Hospital de ClĂnicas General San MartĂn; ArgentinaFil: Vay, Carlos Alberto. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentina. Universidad de Buenos Aires. Facultad de Farmacia y BioquĂmica. Departamento de BioquĂmica ClĂnica; Argentina. Universidad de Buenos Aires. Facultad de Medicina. Hospital de ClĂnicas General San MartĂn; ArgentinaFil: RamĂrez, M. S.. California State University; Estados Unido
The SCUBA-2 Cosmology Legacy Survey: The EGS deep field -- III. The evolution of faint submillimeter galaxies at
We present a demographic analysis of the physical and morphological
properties of -selected galaxies from the deep observations
of the SCUBA-2 Cosmology Legacy Survey in the Extended Groth Strip that are
detected below the classical submillimeter-galaxy regime (/beam) and compare them with a sample of
optically-selected star-forming galaxies detected in the Cosmic Assembly
Near-infrared Deep Extragalactic Legacy Survey in the same field. We derive the
evolution of the main sequence of star-forming galaxies, finding a steeper
specific star formation rate versus stellar mass at than previous
studies. Most faint submillimeter-galaxies fall within of the main
sequence, but 40~per cent are classified as starbursts. Faint submillimeter
galaxies have 50~per cent larger sizes at than optically-selected
star-forming galaxies of the same mass range. This is also the redshift bin
where we find the largest fraction of starbursts, and hence we could be
witnessing merging processes, as confirmed by the preference for
visual-morphology classifications of these systems as irregular disk galaxies
and mergers. Both populations show an increment towards lower redshifts ()
of their concentration in -band morphology, but faint submillimeter galaxies
on average show larger concentration values at later times. These findings
support the claim that faint submillimeter galaxies are mostly a population of
massive dust-obscured disk-like galaxies that develop larger bulge components
at later epochs. While the similarities are great, the median sizes, starburst
numbers and -band concentration of faint submillimeter galaxies differ from
those of optically-selected star-forming galaxies of the same stellar mass.Comment: Accepted for publication in MNRA
Mapping the potential use of endectocide-treated cattle to reduce malaria transmission
Treating cattle with endectocide is a longstanding
veterinary practice to reduce the load of endo and
ectoparasites, but has the potential to be added to the malaria
control and elimination toolbox, as it also kills malaria
mosquitoes feeding on the animals. Here we used openly available
data to map the areas of the African continent where high
malaria prevalence in 2-10 year old children coincides with a
high density of cattle and high density of the partly zoophilic
malaria vector Anopheles arabiensis. That is, mapping the areas
where treating cattle with endectocide would potentially have
the greatest impact on reducing malaria transmission. In regions
of Africa that are not dominated by rainforest nor desert, the
map shows a scatter of areas in several countries where this
intervention shows potential, including central and eastern
sub-Saharan Africa. The savanna region underneath the Sahel in
West Africa appears as the climatic block that would benefit to
the largest extent from this intervention, encompassing several
countries. West Africa currently presents the highest under-10
malaria prevalence and elimination within the next twenty years
cannot be contemplated there with currently available
interventions alone, making the use of endectocide treated
cattle as a complementary intervention highly appealing
Genomics helps to decipher the resistance mechanisms present in a Pseudomonas chlororaphis strain recovered in an HIV patient
Fil: Montaña, Sabrina Daiana. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Houssay. Instituto de Investigaciones en MicrobiologĂa y ParasitologĂa MĂ©dica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en MicrobiologĂa y ParasitologĂa MĂ©dica; ArgentinaFil: Lazzaro, T.. California State University; Estados UnidosFil: Uong, S.. California State University; Estados UnidosFil: Place, K.. California State University; Estados UnidosFil: Iriarte, A.. Universidad de la RepĂșblica; UruguayFil: Ocampo, C. V.. Sanatorio Mater Dei; ArgentinaFil: Vay, C.. Sanatorio Mater Dei; Argentina. Universidad de Buenos Aires. Facultad de Medicina. Hospital de ClĂnicas General San MartĂn; ArgentinaFil: RamĂrez, M. S.. California State University; Estados Unido
Presence of New Delhi metallo-ÎČ-lactamase gene (NDM-1) in a clinical isolate of Acinetobacter junii in Argentina
The Casiquiare river acts as a corridor between the Amazonas and Orinoco river basins: biogeographic analysis of the genus Cichla
The Casiquiare River is a unique biogeographic corridor between the Orinoco and Amazonas basins. We investigated the importance of this connection for Neotropical fishes using peacock cichlids ( Cichla spp.) as a model system. We tested whether the Casiquiare provides a conduit for gene flow between contemporary populations, and investigated the origin of biogeographic distributions that span the Casiquiare. Using sequences from the mitochondrial control region of three focal species ( C. temensis , C. monoculus , and C. orinocensis ) whose distributions include the Amazonas, Orinoco, and Casiquiare, we constructed maximum likelihood phylograms of haplotypes and analyzed the populations under an isolation-with-migration coalescent model. Our analyses suggest that populations of all three species have experienced some degree of gene flow via the Casiquiare. We also generated a mitochondrial genealogy of all Cichla species using >2000âbp and performed a dispersal-vicariance analysis (DIVA) to reconstruct the historical biogeography of the genus. This analysis, when combined with the intraspecific results, supports two instances of dispersal from the Amazonas to the Orinoco. Thus, our results support the idea that the Casiquiare connection is important across temporal scales, facilitating both gene flow and the dispersal and range expansion of species.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/79059/1/j.1365-294X.2010.04540.x.pd
Early Science with the Large Millimetre Telescope: Molecules in the Extreme Outflow of a proto-Planetary Nebula
Extremely high velocity emission likely related to jets is known to occur in
some proto-Planetary Nebulae. However, the molecular complexity of this
kinematic component is largely unknown. We observed the known extreme outflow
from the proto-Planetary Nebula IRAS 16342-3814, a prototype water fountain, in
the full frequency range from 73 to 111 GHz with the RSR receiver on the Large
Millimetre Telescope. We detected the molecules SiO, HCN, SO, and CO.
All molecular transitions, with the exception of the latter are detected for
the first time in this source, and all present emission with velocities up to a
few hundred km s. IRAS 16342-3814 is therefore the only source of this
kind presenting extreme outflow activity simultaneously in all these molecules,
with SO and SiO emission showing the highest velocities found of these species
in proto-Planetary Nebulae. To be confirmed is a tentative weak SO component
with a FWHM 700 km s. The extreme outflow gas consists of dense
gas (n 10--10 cm), with a mass larger than
0.02--0.15 M. The relatively high abundances of SiO and SO may
be an indication of an oxygen-rich extreme high velocity gas.Comment: Accepted for publication in Monthly Notices of the Royal Astronomical
Society Letter
AzTEC 1.1 mm observations of high-z protocluster environments : SMG overdensities and misalignment between AGN jets and SMG distribution
We present observations at 1.1 mm towards 16 powerful radio galaxies and a radio-quiet quasar at 0.5 > z > 6.3 acquired with the AzTEC camera mounted at the James Clerk Maxwell Telescope and Atacama Submillimeter Telescope Experiment to study the spatial distribution of submillimetre galaxies (SMGs) towards possible protocluster regions. The survey covers a total area of 1.01 sq deg with rms depths of 0.52-1.44 mJy and detects 728 sources above 3Ï. We find overdensities of a factor of ~2 in the source counts of three individual fields (4C+23.56, PKS1138-262, and MRC0355-037) over areas of ~200 sq deg. When combining all fields, the source-count analysis finds an overdensity that reaches a factor âł 3 at S 1.1mm = 4mJy covering a 1.5-arcmin-radius area centred on the active galactic nucleus. The large size of our maps allows us to establish that beyond a radius of 1.5 arcmin, the radial surface density of SMGs falls to that of a blank field. In addition, we find a trend for SMGs to align closely to a perpendicular direction with respect to the radio jets of the powerful central radio galaxies (73 -14 +13 deg). This misalignment is found over projected comoving scales of 4-20 Mpc, departs from perfect alignment (0 deg) by ~5Ï, and apparently has no dependence on SMG luminosity. Under the assumption that the AzTEC sources are at the redshift of the central radio galaxy, the misalignment reported here can be interpreted as SMGs preferentially inhabiting mass-dominant filaments funnelling material towards the protoclusters, which are also the parent structures of the radio galaxies.Peer reviewe
Molecular characterization of KPC-2âpositive Klebsiella pneumoniae isolates from a neurosurgical centre in Argentina
Carbapenem-resistant Enterobacteriaceae is a growing concern worldwide. Klebsiella pneumoniae is an important nosocomial pathogen with a high capacity for nosocomial spread. We described the occurrence of plasmid-encoded KPC-2âharbouring K. pneumoniae isolates recovered from a neurosurgical centre in Argentina. The blaKPC-2 gene was surrounded by ISkpn6 and ISkpn7.Fil: Montaña, Sabrina Daiana. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Houssay. Instituto de Investigaciones en MicrobiologĂa y ParasitologĂa MĂ©dica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en MicrobiologĂa y ParasitologĂa MĂ©dica; ArgentinaFil: Hernandez, M.. California State University; Estados UnidosFil: Fernandez, J. S.. California State University; Estados UnidosFil: Penini, M.. Stamboulian Servicios de Salud; ArgentinaFil: Centron, Daniela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Houssay. Instituto de Investigaciones en MicrobiologĂa y ParasitologĂa MĂ©dica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en MicrobiologĂa y ParasitologĂa MĂ©dica; ArgentinaFil: Sucari, A.. Stamboulian Servicios de Salud; ArgentinaFil: Iriarte, A.. Universidad de la RepĂșblica; UruguayFil: Ramirez, Maria Soledad. California State University; Estados Unido
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