Weed spatial distribution as a function of soil properties in two distinct environments of the Brazilian semi-arid region.

The present study aimed was to evaluate the spatial variability of weed species by means of phytosociological parameters and their correlations with the physical-chemical soil properties, under semiarid climate conditions. Weed phytosociology and soil characterization were carried out in two areas one newly deforested area covering 8.86 ha, and one experimental agricultural area covering 24.7 ha; both in the semi-arid region of Brazil. Weed and soil were sampled by following georeferenced grids in each area. Biomass and the total number of weed individuals, as well as soil properties, were mapped by the ordinary Kriging method. The predominant herbaceous plants in the newly deforested area were Hexasepalum teres and Digitaria insularis. The weed species that predominated in the agricultural area were Cyperus rotundus L., Euphorbia heterophylla L. and Herissantia Crispa (L.) Brizicky; the latter species outstanding for dry biomass (873.5g). Spatial dependence was observed for the predominant species, except for Digitaria insularis. The spatial distribution of these weeds was conditioned by soil K+ contents in both areas, and by sand content for the experimental agricultural area. Therefore, these two soil attributes resulted key factors for weed infestation in this semi-arid region.

Reactive lymphoid hyperplasia in the oral cavity of a cardiac patient ­case report

ABSTRACT: This descriptive observational study reports a case of reactive lymphoid hyperplasia in the oral cavity of a pediatric cardiac patient followed up at a public tertiary care hospital. This male patient was five years old, with hypoplastic left heart syndrome, treated with Carvedilol, Furo-semide, Losartan, Warfarin, Montelukast, and beclometasone. His legal guardian reported an in-creased amount of tissue on the floor of the mouth ongoing for approximately 24 hours, followed by prostration, fever, bilateral lymphadenopathy, and a refusal to eat. After removal of the oral infectious foci (carious lesions) in the operating room, regression of the lesion and symptoms was observed, suggesting a diagnosis of a lesion caused by reactional lymphoid hyperplasia, a rareand benign condition in which there is an increase in tissue volume, caused by the proliferation of lym-phoid cells to fight an aggressor agent.