Maria Aparecida Lopes

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We present data on aspects of the behavioral ecology of a free- ranging group of Saguinus fuscicollis weddelliat a site in Brazilian Amazonia where a second callitrichid, Callithrix emiliae,is syntopic. Diet, activity patterns, and ranging behavior are broadly similar to those of S. fuscicollisfrom sites in Bolivia, Brazil, and Perú, though significant(More)
Ethnobotanical information can clarify how dependent a community is on local plant resources and provide evidence about the consequences of resource exploitation. We performed a quantitative analysis on different aspects of knowledge and use of palms by the residents of the surrounding the Tucuruí Hydroelectric Power Station reservoir, eastern Amazonia, and(More)
We study numerically and analytically first- and second-order phase transitions in neuronal networks stimulated by shot noise (a flow of random spikes bombarding neurons). Using an exactly solvable cortical model of neuronal networks on classical random networks, we find critical phenomena accompanying the transitions and their dependence on the shot noise(More)
One of the most common types of polyspecific association observed in Neotropical primate communities is that between squirrel monkeys (Saimiri) and capuchins (Cebus). The present study focused on association patterns in two Saimiri sciureus groups in eastern Brazilian Amazonia, between March and October, 2009. The associations were analyzed in terms of the(More)
(Population structure of Eschweilera coriacea (DC.) S. A. Mori in forest fragments in eastern Brazilian Amazonia). The population structure of a common canopy tree was examined in three sites to investigate the possible effects of forest fragmentation in eastern Amazonia. Evidence for the escape hypothesis of differential seed/seedling survival was(More)
Quantitative data on the gut proportions of the recently-described black-headed marmoset (Callithrix nigriceps) from western Brazilian Amazonian are presented. Like other marmosets, C. nigriceps exhibits a relatively large caecum and colon associated with adaptations for gummivory. The degree of gut specialisation recorded is greater than that for any other(More)
Squirrel monkeys (Saimiri spp.) are widely distributed in the Amazon basin. This study describes the ecological and behavioral patterns of two social groups of S. sciureus in forests adjacent to the Tucuruí hydroelectric reservoir in eastern Amazonia, including range size, activity budgets, and composition of the diet. The groups were monitored at Base 4(More)
Understanding of short-term synaptic depression (STSD) and other forms of synaptic plasticity is a topical problem in neuroscience. Here we study the role of STSD in the formation of complex patterns of brain rhythms. We use a cortical circuit model of neural networks composed of irregular spiking excitatory and inhibitory neurons having type 1 and 2(More)
One thousand seven hundred and eight chronic chagasic post-mortem examinations studied from a total of 4690 autopsies performed at our Institution. Two hundred and seventy-three chagasic had megas. Megacolon was the most frequent, followed by megaesophagus. Megacolon associated with megaesophagus was the third most common finding. Our data are discussed and(More)