The larva of Seticeros aquilus (Thomson), collected in Quercus humboldtii (Fagaceae) in Colombia, is described and illustrated. Biological notes and a comparison with the larva of Chorenta reticulata described by Duffy (1960) and with the descriptions of the other South American Callipogonini species are presented.

The zona reticulata, the subdivision of the substantia nigra containing dendrites of the dopaminergic nigro-neostriatal neurons, contains dopamine-sensitive adenylate cyclase activity. This nigral dopamine receptor is similar to the striatal dopamine receptor. These and previous data suggest a physiological role (or roles) for dopamine in the substantia nigra.

Cyprinodontiformes fishes (guppies) are widely distributed in Neotropical regions and use deteriorated microhabitats in rivers where few species can occur. This study was carried out in a stretch of the Paraíba do Sul River in bracketing a large urban-industrial complex. The aim was to assess eventual effects that the industrial complex could have on distribution of two closely related fish spe...

BACKGROUND Severe gait disturbances in idiopathic Parkinson's disease (PD) are observed in up to 80% of all patients in advanced disease stages with important impact on quality of life. There is an unmet need for further symptomatic therapeutic strategies, particularly as gait disturbances generally respond unfavourably to dopaminergic medication and conventional deep brain stimulation of the s...

In order to determine whether the cholinergic fibres that innervate the substantia nigra make synaptic contact with dopaminergic neurons of the substantia nigra pars compacta, a double immunocytochemical study was carried out in the rat and ferret. Sections of perfusion-fixed mesencephalon were incubated first to reveal choline acetyltransferase immunoreactivity to label the cholinergic termina...

Studies on the evolution of female preference and male color polymorphism frequently focus on single species since traits and preferences are thought to co-evolve. The guppy, Poecilia reticulata, has long been a premier model for such studies because female preferences and orange coloration are well known to covary, especially in upstream/downstream pairs of populations. However, focused single...

Continuous cultures of Skeletonema costatum, Chaetoceros muelleri, Rhinomonas reticulata and PaÕloÕa lutheri were subjected to phosphorus or nitrogen limitation at two light intensities in order to manipulate their biochemical composition. They were then fed to Mytilus edulis larvae over a 2-week period, and the larval growth and mortality were assessed. All monospecific diets supported growth,...