216 research outputs found
PERFIL HEMATOLĂGICO DE OVELHAS SANTA INĂS SUPLEMENTADAS A PASTO NO TERĂO FINAL DE GESTAĂĂO E NO PĂS-PARTO
RepresentaçÔes cotidianas: uma proposta de apreensão de valores sociais na vertente marxista de produção do conhecimento
Angiosperm flora used by meliponine guilds (Apidae, Meliponina) occurring at rainforest edges in the state of CearĂĄ, Brazil
Early assembly of the most massive galaxies
The current consensus is that galaxies begin as small density fluctuations in
the early Universe and grow by in situ star formation and hierarchical merging.
Stars begin to form relatively quickly in sub-galactic sized building blocks
called haloes which are subsequently assembled into galaxies. However, exactly
when this assembly takes place is a matter of some debate. Here we report that
the stellar masses of brightest cluster galaxies, which are the most luminous
objects emitting stellar light, some 9 billion years ago are not significantly
different from their stellar masses today. Brightest cluster galaxies are
almost fully assembled 4-5 Gyrs after the Big Bang, having grown to more than
90% of their final stellar mass by this time. Our data conflict with the most
recent galaxy formation models based on the largest simulations of dark matter
halo development. These models predict protracted formation of brightest
cluster galaxies over a Hubble time, with only 22% of the stellar mass
assembled at the epoch probed by our sample. Our findings suggest a new picture
in which brightest cluster galaxies experience an early period of rapid growth
rather than prolonged hierarchical assembly.Comment: Published in Nature 2nd April 2009. This astro ph version includes
main text and supplementary material combine
Biofilm production by multiresistant Corynebacterium striatumassociated with nosocomial outbreak
Ichthyofauna as bioindicator of environmental quality in an industrial district in the amazon estuary, Brazil
Longitudinal Associations Between Perceived Parent-Adolescent Attachment Relationship Quality and Generalized Anxiety Disorder Symptoms in Adolescence
This longitudinal study examined the direction of effects between adolescentsâ generalized anxiety disorder (GAD) symptoms and perceived parent-adolescent attachment relationship quality, as well as the moderating role of gender and age. 1,313 Dutch adolescents (48.5% boys) from two age cohorts of early (nâ=â923, Mageâ=â12 at W1) and middle (nâ=â390, Mageâ=â16 at W1) adolescents completed questionnaires regarding their attachment relationship to parents and GAD symptoms in four waves. Cross-lagged path analyses demonstrated that adolescentsâ GAD symptoms and perceived father-adolescent attachment relationship quality bidirectionally negatively affected each other over time. For mothers, adolescentsâ GAD symptoms negatively predicted perceived mother-adolescent attachment relationship quality over time. The within-wave correlated residuals between perceived attachment relationship quality with fathers and GAD symptoms were stronger for boys than for girls and stronger for the cohort of middle adolescents than for the cohort of early adolescents. This study demonstrates that both the parentsâ and the adolescentsâ gender as well as the adolescentsâ age affects the relation between adolescentsâ GAD symptoms and perceived parent-adolescent attachment relationship quality
AnĂĄlise das prĂĄticas gerenciais na Atenção PrimĂĄria Ă SaĂșde nos municĂpios de pequeno porte do norte do ParanĂĄ, Brasil
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