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Brazilian Latosols are characterized by low activity clay, little horizon differentiation, a weak macrostructure and a strong microgranular structure. The development of the latter that was reported as being possibly related to the fine material mineralogy, location in the landscape, parental material and biological activity is still under discussion. The(More)
A comparative analysis of the gastrointestinal tracts of wild-caught marmosets, Callithrix emiliae, and tamarins, Saguinus fuscicollis weddelli, was undertaken in order to evaluate the degree of specialisation for digestion of plant exudates. Compared to S.f. weddelli, C. emiliae exhibits a reduced small intestine and a relatively large, compartmentalised(More)
This study compared the centrifuge and pressure plate methods with appropriate run durations. Samples collected in tropical soils located in Brazil along a 10-km local hydrosequence across the Cerrado–Amazonia transition (Set 1) and along a 350-km regional toposequence across the Cerrado region (Set 2) were selected to compare and discuss statistically the(More)
The Cerrado region, with over 50 million hectares of cultivated pasture, provides 55% of Brazilian beef production. Previous investigations have shown that about 70-80% of this pasture is affected by some kind of degradation, leading to low productivity. However, until now, few surveys have been carried out on a regional scale. The aim of the present work(More)
Mineralogy of the Latosols of the Brazilian Central Plateau remains under discussion in the absence of clear relationship with their age according to their geomorphic location. The aim of this study was thus to clarify the origin the kaolinite and gibbsite content variation by studying a regional toposequence and using data from the literature. Chemical(More)
AIMS To evaluate the association among serum immunoglobulin G (IgG) responses to Aggregatibacter actinomycetemcomitans (Aa) serotypes a, b and c, Porphyromonas gingivalis (Pg), Tannerella forsythia (Tf) and clinical parameters in Aggressive Periodontitis (AP) subjects. Associations between periodontal pathogens and clinical and immunological parameters were(More)
INTRODUCTION Despite the high rate of tuberculosis (TB) indicators in Brazil, the Federal District (FD) shows a low prevalence of the disease. OBJECTIVE To analyze the relationship between climatic factors and air quality with tuberculosis in the Brazilian Federal District. METHODOLOGY This was an ecological and descriptive study comparing 3927 new(More)
Latosols are characterized by a poor differentiation of the horizons, a weak macrostructure and a strong submillimetric granular structure resulting in microaggregates 50 to 300 µm in size. The shrinkage properties of these microaggregates that are generally considered as very weak or absent are still under discussion. The objective of our study is the(More)