2,371 research outputs found
Uma reflexão sobre a personalidade jurídica
Resumo: O tema da personalidade jurídica, é inesgotável e umbilicalmente ligada à pessoa humana. Se historicamente, o conceito de pessoa para o direito foi evoluindo, também e consequentemente, o processo formativo da atribuição da personalidade jurídica. Diferentes entendimentos na forma de se expressar, a personalidade jurídica é em si mesma, um desafio. Focando a nossa atenção no conceito, deixamos para reflexão a análise critica do momento de atribuição da personalidade jurídica, mas também, os problemas que atualmente se levantam, como é o caso da eugenia, dos direitos à imagem e à reserva da vida privada. Também abrimos a porta a novas conceptualizações de pessoas jurídicas, que ultrapassam a matriz humana e das pessoas coletivas
Evolution of star formation in the UKIDSS ultra deep survey field-I. Luminosity functions and cosmic star formation rate out to z = 1.6
We present new results on the cosmic star formation history in the Subaru/XMM-Newton Deep Survey (SXDS)-Ultra Deep Survey (UDS) field out to z = 1.6. We compile narrowband data from the Subaru Telescope and the Visible and Infrared Survey Telescope forAstronomy (VISTA) in conjunction with broad-band data from the SXDS and UDS, to makea selection of 5725 emission-line galaxies in 12 redshift slices, spanning 10 Gyr of cosmictime. We determine photometric redshifts for the sample using 11-band photometry, and usea spectroscopically confirmed subset to fine tune the resultant redshift distribution. We usethe maximum-likelihood technique to determine luminosity functions in each redshift slice and model the selection effects inherent in any narrow-band selection statistically, to obviatethe retrospective corrections ordinarily required. The deep narrow-band data are sensitive tovery low star formation rates (SFRs), and allow an accurate evaluation of the faint end slopeof the Schechter function, α We find that a is particularly sensitive to the assumed faintest broad-band magnitude of a galaxy capable of hosting an emission line, and propose thatthis limit should be empirically motivated. For this analysis, we base our threshold on thelimiting observed equivalent widths of emission lines in the local Universe. We compute thecharacteristic SFR of galaxies in each redshift slice, and the integrated SFR density,ρ SFR. Wefind our results to be in good agreement with the literature and parametrize the evolution of the SFR density as ρ SFR α(1 + z)4.58 confirming a steep decline in star formation activity since z ~ 1.6.Peer reviewe
6-Phenyl-5a,6,6a,7,12,13a-hexahydro-5H-benzo[6,7]indolizino[3,2-a]pyrrolizine
In the title compound, C23H22N2, the central pyrrolidine ring adopts an envelope conformation. The benzene ring of the hexahydropyrroloisoquinoline ring system makes dihedral angles of 83.43 (6) and 61.99 (10)°, respectively, with the phenyl and pyrrole rings. In the crystal structure, weak C—H⋯π interactions are observed
The stellar mass function of star-forming galaxies and the mass-dependent SFR function since z = 2.23 from HiZELS
We explore a large uniformly selected sample of Hα selected star-forming galaxies (SFGs) at z = 0.40, 0.84, 1.47, 2.23 to unveil the evolution of the star formation rate (SFR) function and the stellar mass function. We find strong evolution in the SFR function, with the typical SFR of SFGs declining exponentially in the last 11 Gyr as SFR*(T[Gyr]) = 104.23/T + 0.37 M⊙ yr−1, but with no evolution in the faint-end slope, α ≈ −1.6. The stellar mass function of SFGs, however, reveals little evolution: α ≈ −1.4, M* ∼ 1011.2 ± 0.2 M⊙ and just a slight increase of ∼2.3× in Φ* from z = 2.23 to z = 0.4. The stellar mass density within SFGs has been roughly constant since z = 2.23 at ∼107.65 ± 0.08 M⊙ Mpc−3, comprising ≈100 per cent of the stellar mass density in all galaxies at z = 2.23, and declining to ≈20 per cent by z = 0.40, driven by the rise of the passive population. We find that SFGs with ∼1010.0 ± 0.2 M⊙ contribute most to the SFR density (ρSFR) per d log10M, and that there is no significant evolution in the fractional contribution from SFGs of different masses to ρSFR or ρSFR(d log10M)−1 since z = 2.23. Instead, we show that the decline of SFR* and of ρSFR is primarily driven by an exponential decline in SFRs at all masses. Our results have important implications not only on how SFGs need to be quenched across cosmic time, but also on the driver(s) of the exponential decline in SFR* from ∼66 M⊙ yr−1 to 5 M⊙ yr−1 since z ∼ 2.23
Identification of descendants of an extinct bovine population from the Algarve region of Portugal using numerical taxonomy analysis of morphological traits
The morphology of a sample of four bulls and 43 cows, presumed to be
descendants of the extinct cattle breed ‘Algarvia’ (AG), was used to
assign their relationship with animals from other Portuguese autochthonous
breeds – Arouquesa (AR), Barrosa˜ (BA), Cachena (CA), Marinhoa
(MA), Maronesa (MO), Minhota (MN), Mirandesa (MI), (only bulls),
Alentejana (AL), Garvonesa (GA), Mertolenga (ME) and Preta (PR).
Standard numerical taxonomic methods were applied to a set of 183
(cows) and 170 (bulls) traits, to derive average pairwise taxonomic distances
among the sample of 257 cows and 76 bulls. Distance coefficients
(morphological index of distance) ranged from 0.22 to 2.62 (cows) and
from 0.49 to 2.13 (bulls). Unweighted pair group method using arithmetic
averages (UPGMA)-based phenograms and a principal coordinate
analysis showed that bulls were highly clustered and cows showed a
tendency to cluster according to their geographical and breed origin.
The AG population grouped together with GA, AL, ME and MN breeds
in the Red Convex group. The average taxonomic distance among
breeds was 1.02, the highest being 1.39 (ME versus BA) and the lowest
being 0.64 (MA versus AR). The approach allowed for the identification
of a phenotypically differentiated set of animals, comprising 19 cows
and four bulls representative of the AG breed, and which can be targeted
in further studies aiming at the recovery of this extinct breed
Methyl 3-(4-chlorophenyl)-1-methyl-1,2,3,3a,4,11c-hexahydrobenzo[f]chromeno[4,3-b]pyrrole-3a-carboxylate
In the title compound, C24H22ClNO3, the dihedral angle between the naphthalene ring system and the chlorophenyl ring is 67.44 (4)°. The pyrrolidine and dihydropyran rings exhibit envelope and half chair conformations, respectively. In the crystal structure, weak C—H⋯π interactions are observed
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