6,282 research outputs found
The host of the Type I SLSN 2017egm: A young, sub-solar metallicity environment in a massive spiral galaxy
Here we present an integral-field study of the massive, high-metallicity
spiral NGC 3191, the host of SN 2017egm, the closest SLSN Type I to date. We
use data from PMAS/CAHA and the public MaNGA survey to shed light on the
properties of the SLSN site and the origin of star-formation in this
non-starburst spiral galaxy. We map the physical properties different
\ion{H}{II} regions throughout the galaxy and characterize their stellar
populations using the STARLIGHT fitting code. Kinematical information allows to
study a possible interaction with its neighbouring galaxy as the origin of
recent star formation activity which could have caused the SLSN. NGC 3191 shows
intense star-formation in the western part with three large SF regions of low
metallicity. The central regions of the host have a higher metallicity, lower
specific star-formation rate and lower ionization. Modeling the stellar
populations gives a different picture: The SLSN region has two dominant stellar
populations with different ages, the youngest one with an age of 2-10 Myr and
lower metallicity, likely the population from which the SN progenitor
originated. Emission line kinematics of NGC 3191 show indications of
interaction with its neighbour MCG+08-19-017 at 45 kpc, which might be
responsible for the recent starburst. In fact, this galaxy pair has in total
hosted 4 SNe, 1988B (Type Ia), SN 2003ds (Type Ic in MCG+08-19-017), PTF10bgl
(SLSN-Type II) and 2017egm, underlying the enhanced SF in both galaxies due to
interaction. Our study shows that one has to be careful interpreting global
host and even gas properties without looking at the stellar population history
of the region. SLSNe seem to still be consistent with massive stars ( 20
M) requiring low () metallicity and those environments
can also occur in massive, late-type galaxies but not necessarily starbursts.Comment: Accepted for publication in A&A, 13 pages, 11 figures, 7 tables.
Abstract has been reduced to match arXiv form requirement
Vector bosons in heavy-ion collisions at the LHC
Vector bosons become accessible experimental probes in heavy-ion collisions
at the LHC. The capabilities of the LHC experiments to perform their
measurement are outlined. The focus is given to their utility to study the
possible formation and properties of the Quark Gluon Plasma (QGP) in the most
central heavy-ion collisions. Their own sensitivity (if any) to the QGP is
discussed. Their interest as references to observe multiple QGP sensitive
probes is justified.Comment: HP2008 proceedings, to appear in Eur.Phys.J.
CSIC High Specialization Course on Cultural Heritage Intervention Models: Research, Protection, Conservation and Valorization: A training Experience from a complex research programme.
ComunicaciĂłn presentada en la 18th Annual Meeting of the European Association of Archaeologists, celebrada en Helsinki del 29 de agosto al 1 de septiembre de 2012.In late 2007 the then called Ministry of Education and Science funded the Research Program on Technologies for the Conservation and Valorization of Cultural Heritage (TCP) within the CONSOLIDER -INGENIO 2010 call. In it 16 research groups take part, from the CSIC and 4 Spanish universities, articulating traditionally distant disciplines directly involved with Cultural Heritage. The base for working is the culture of cooperation and collaboration between groups in an interdisciplinary way. TCP was the only funded proposal of the call that focused on the study of Cultural Heritage.
One of the main objectives of the project included training, so after valorizing different options, it was finally decided to opt for a CSIC High Specialization Course model. The aim was to create a postgraduate training strategy for preparing, in a truly specialized way, professionals with technical or scientific profile, who can become the best professionals working on cultural heritage.
This course was an alternative possibility, different from formal university education. It also benefited from greater freedom in designing the course, choosing the participating teachers, and establishing the relationship between practical and theoretical aspects.
This goal lies at the very foundations of the Consolider call and more specifically, also within TCP: strengthen and highlight the link between the interdisciplinary research, the professional practice and the social visibility of research through training, dissemination and knowledge transfer.Peer Reviewe
Impact of Fermion Mass Degeneracy on Flavor Mixing
We carry out a systematic analysis of flavor mixing and CP violation in the
conceptually interesting limit where two quarks or leptons of the same charge
are degenerate in mass. We pay some particular attention to the impact of
neutrino mass degeneracy and Majorana phase degeneracy on the lepton flavor
mixing matrix.Comment: 14 page
GISH-based comparative genomic analysis in Urochloa P. Beauv.
The genus Urochloa P. Beauv. [syn. Brachiaria (Trin.) Griseb.] comprises species of great economic relevance as forages. The genomic constitution for the allotetraploid species Urochloa brizantha (cv. Marandu) and Urochloa decumbens (cv. Basilisk) and the diploid Urochloa ruziziensis was previously proposed as BBB1B1, B1B1B2B2 and B2B2, respectively. Evidence indicates U. ruziziensis as the ancestral donor of genome B2 in U. decumbens allotetraploidy, but the origin of the genomes B and B1 is still unknown. There are diploid genotypes of U. brizantha and U. decumbens that ay be potential ancestors of the tetraploids. The aim of this study was to determine the genomic constitution and relationships between genotypes of U. brizantha (2x and 4x), U. decumbens (2x and 4x) and U. ruziziensis (2x) via genomic in situ hybridization (GISH). Additionally, chromosome number and genome size were verified for the diploid genotypes. The diploids U. brizantha and U. decumbens presented 2n = 2x = 18 chromosomes and DNA content of 1.79 and 1.44 pg, respectively. The GISH analysis revealed high homology between the diploids U. brizantha and U. decumbens, which suggests relatively short divergence time. The GISH using genomic probes from the diploid accessions on the tetraploid accessions? chromosomes presented similar patterns, highlighting the genome B1 present in both of the tetraploids. Based on GISH results, the genomic constitution was proposed for the diploid genotypes of U. brizantha (B1B1) and U. decumbens (B1′B1′) and both were pointed as donors of genome B1 (or B1′), present in the allotetraploid genotypes
Efeito de fatores de processo na atividade holocelulolĂtica e no crescimento micelial de Lentinula edodes.
Resumo. DisponĂvel online. MIPE
Avaliação de hĂbridos de Brachiaria decumbens quanto Ă resistĂȘncia Ă cigarrinha-das-pastagens Deois flavopicta.
Estudos de resistĂȘncia de gramĂneas forrageiras Ă s cigarrinhas-das-pastagens tĂȘm gerado resultados decisivos para o lançamento de cultivares que se apresentem resistentes a essas pragas, o que atĂ© o momento se caracteriza como melhor mĂ©todo de controle das mesmas. Objetivou-se com este trabalho avaliar 38 hĂbridos intraespecĂficos de Brachiaria decumbens (R12, R71, R81, R120, R158, R161, R165, R167, R168, R169, R176, R178, R179, R181, R183, R184, R188, R189, R193, S3, T44, T54, T66, T68, T86, T87, T89, X2, X30, X61, X72, X78, X99, X118, X121, X122, Y22, Y23) pelo mĂ©todo proposto pelo Centro Internacional de Agricultura Tropical (CIAT)
Microsporogenesis in Brachiaria brizantha (Poaceae) as a selection tool for breeding.
The genus Brachiaria comprises more than 100 species and is the single most important genus of forage grass in the tropics. Brachiaria brizantha , widely used in Brazilian pastures for beef and dairy production, is native to tropical Africa. As a subsidy to the breeding program underway in Brazil, cytological studies were employed to determine the chromosome number and to evaluate microsporogenesis in 46 accessions of this species available at Embrapa Beef Cattle (Brazil)
Design, Synthesis and Discovery of N,N'-Carbazoyl-aryl-urea Inhibitors of Zika NS5 Methyltransferase and Virus Replication
The recent outbreaks of Zika virus (ZIKV) infection worldwide make the discovery of novel antivirals against flaviviruses a research priority. This work describes the identification of novel inhibitors of ZIKV through a structureâbased virtual screening approach using the ZIKV NS5âMTase. A novel series of molecules with a carbazoylâarylâurea structure has been discovered and a library of analogues has been synthesized. The new compounds inhibit ZIKV MTase with IC50 between 23â48â
ÎŒM. In addition, carbazoylâarylâureas also proved to inhibit ZIKV replication activity at micromolar concentration
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