Respiração, liberação de etileno e qualidade de graviola (Annona muricata L.) durante a maturação pós-colheita.

O objetivo deste estudo foi avaliar alterações físicas-químicas durante a maturação da graviola

Compostos fenólicos e enzimas oxidativos da graviola (Annona muricata) durante a maturação.

O presente trabalho teve por objetivo avaliar as variações nos teores de compostos fenólicos e na atividade de enzimas oxidativas durante a maturação da graviola

Excited-state quantum phase transitions in many-body systems with infinite-range interaction : localization, dynamics, and bifurcation

Excited state quantum phase transitions (ESQPTs) are generalizations of quantum phase transitions (QPTs) to excited levels. They are associated with local divergences in the density of states. Here, we investigate how the presence of an ESQPT can be detected from the analysis of the structure of the Hamiltonian matrix, the level of localization of the eigenstates, the onset of bifurcation, and the speed of the system evolution. Our findings are illustrated for a Hamiltonian with infinite-range Ising interaction in a transverse field. This is a version of the Lipkin-Meshkov-Glick (LMG) model and the limiting case of the one-dimensional spin-1/2 system with tunable interactions realized with ion traps. From our studies for the dynamics, we uncover similarities between the LMG and the noninteracting XX models.LFS and MT were supported by the NSF grant No. DMR- 1147430. FPB was funded by MINECO grant FIS2014- 53448-C2- 2-P and by Spanish Consolider-Ingenio 2010 (CPANCSD2007- 00042). LFS and FPB thank Pedro Perez- Fernandez and Jorge Dukelsky for discussions, as well as the hospitality of Alejandro Frank and the Centro de Ciencias de la Complejidad (C3) at the UNAM in Mexico, where part of this work was carried out

Sobrevivência de pacientes adultos com Aids em hospital de referência no Nordeste brasileiro

OBJECTIVE: To evaluate the influence of sociodemographic, clinical, and epidemiological factors in AIDS patients survival in a reference hospital. METHODS: A sample of 502 adult AIDS patients out of 1,494 AIDS cases registered in a hospital in Fortaleza, Brazil, was investigated between 1986 and 1998. Sixteen cases were excluded due to death at the moment of the AIDS diagnosis and 486 were analyzed in the study. Socioeconomic and clinical epidemiological were the variables studied. Statistical analysis was conducted using the Kaplan-Meier survival analysis and the Cox proportional hazards model. RESULTS: Three hundred and sixty two out of the 486 patients studied took at least one antiretroviral drug and their survival was ten times longer than those who did not take any drug (746 and 79 days, respectively, pOBJETIVO: Avaliar, em um hospital de referência, a influência de fatores sociodemográficos e clínico-epidemiológicos na sobrevivência de pacientes com Aids. MÉTODOS:Foi estudada uma amostra de 486 adultos com Aids atendidos em hospital de referência no Ceará, entre 1986 e 1998. Foram avaliadas as variáveis socioeconômicas e clínico-epidemiológicas. A análise foi realizada pelo método Kaplan-Meier e por regressão de Cox. RESULTADOS: Dos 486 pacientes estudados, 362 utilizaram pelo menos uma droga anti-retroviral e tiveram sobrevida dez vezes maior que os que não a utilizaram (746 e 79 dias, respectivamente;