Charmed hadron signals of partonic medium

We present a short review of our results on the collectivity and the suppression pattern of charmed mesons in heavy-ion collisions based on the microscopic Hadron-String Dynamics (HSD) transport approach for different scenarios of charm interactions with the surrounding matter - the 'comover' dissociation by mesons with further recreation by D+Dbar channels and 'pre-hadronic' interaction scenarios. While at SPS energies the hadronic 'comover' absorption scenario is found to be compatible with the experimental data, the dynamics of c and cbar quarks at RHIC are dominated by partonic or 'pre-hadronic' interactions in the strongly coupled quark-gluon plasma stage and cannot be modeled by pure hadronic interactions. We find that the collective flow of charm in the purely hadronic scenario appears compatible with the data at SPS energies but underestimates the data at top RHIC energies. Thus, the large elliptic flow v2 of D mesons and the low R_AA(pT) of J/Psi seen experimentally at RHIC have to be attributed to early interactions of non-hadronic degrees of freedom. Simultaneously, we observe that non-hadronic interactions are mandatory in order to describe the narrowing of the J/Psi rapidity distribution from p+p to central Au+Au collisions at the top RHIC energy. We demonstrate additionally that the strong quenching of high-pT J/Psi's in central Au+Au collisions indicates that a fraction of final J/Psi mesons is created by a coalescence mechanism close to the phase boundary.Comment: Talk given at International Conference on Strangeness in Quark Matter (SQM 2008), Beijing, China, 6-10 Oct 200

Tendências genéticas para peso aos 240 e 420 dias de idade de bovinos da raça Nelore.

Nesse sentido, o presente trabalho objetivou avaliar as tendências genéticas dos efeitos diretos para o peso aos 240 (P240) e 420 (P420) dias de idade de animais da raça Nelore criados na região de Goiás

Bertholletia excelsa Bonpl. seed removal in a primary forest in the Southwest Amazon.

Bertholletia excelsa Bonpl. (Brazil nut) is an important extractive resource and one of the main sources of income for many traditional forest communities. The agouti (Dasyprocta spp.) is primarily responsible for seed removal and dispersal as this species has its seeds enclosed in a fibrous endocarp that most species cannot penetrate. The objective of this study was to quantify the rate of Brazil nut seed removal and to photograph possible seed dispersers and predators