Nutrient enrichment is related to two facets of beta diversity for stream invertebrates across the united states

Beta diversity, the spatial or temporal variability of species composition, is a key concept in community ecology. However, our ability to predict the relative importance of the main drivers of beta diversity (e. g., environmental heterogeneity, dispersal limitation, and environmental productivity) remains limited. Using a comprehensive data set on stream invertebrate assemblages across the continental United States, we found a hump-shaped relationship between beta diversity and within-ecoregion nutrient concentrations. Within-ecoregion compositional dissimilarity matrices were mainly related to environmental distances in most of the 30 ecoregions analyzed, suggesting a stronger role for species-sorting than for spatial processes. The strength of these relationships varied considerably among ecoregions, but they were unrelated to within-ecoregion environmental heterogeneity or spatial extent. Instead, we detected a negative correlation between the strength of species sorting and nutrient concentrations. We suggest that eutrophication is a major mechanism disassembling invertebrate assemblages in streams at a continental scale.

Signaling Pathways Activation by Primary Endodontic Infectious Contents and Production of Inflammatory Mediators

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Antioxidant activity and determination of total phenol contents, carotenoids, beta-carotene, lycopene and zinc in white, yellow and pinkish varieties of manihot esculenta crantz

There are cassava varieties that present compounds as carotenoids, beta-carotene, lycopene and minerals important for human and animal health. The present study evaluated the antioxidant activity of the white, yellow and pinkish varieties of Manihot esculenta, by mean of the DPPH test and by the ferrous ion-chelating activity. Furthermore, the total phenols, carotenoids, beta-carotene, lycopene and zinc contents were also determined. Utilizing the DPPH test it was possible to find that extracts of boiled samples presented higher antioxidant activity (89.53% -pinkish) in comparison to the fresh samples (1.97% -white). For the ferrous ion-chelating test, the highest activity was found for the boiled pinkish variety extract (63.43%) and the lowest was for fresh yellow extract (17.34%) the white sample did not present activity. The highest concentration of total phenols and zinc content was obtained for the boiled pinkish variety extract 136.12 mg EAG/g of extract and 0,811ppm, respectively, in the concentration of 1000 mu g/mL. The pinkish variety presented also higher quantity of pigments, including carotenoid (29.40 mu g/g), beta-carotene (9.14 mu g/100g) and lycopene (68.92%). According to the results obtained in this study it was possible to conclude that the yellow and pinkish varieties of M. esculenta present quantity of phenolic compounds and minerals sufficient to attribute the antioxidant activity and may thus contribute to reduce oxidative damage and be used as nutraceuticals or directly ingested in the diet to maintain good health.

Cádmio, cobre e cromo em solo e plantas de milho após quinze anos de aplicações anuais de lodo de esgoto

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Avaliação do crescimento de plantas de milho em função de doses de potássio e estresse hídrico

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Adubação fosfatada e épocas de cultivo na composição química de sementes de cultivares de feijoeiro

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Effects of potassium application and soil moisture on the growth of Corymbia citriodora plants

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Influence of rootstocks and pruning times on yield and on nutrient content and extraction in 'Niagara Rosada' grapevine

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Nutrient accumulation and biomass production of alfafa after soil amendment with silicates

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Macrophage Cell Activation with Acute Apical Abscess Contents Determined by Interleukin-1 Beta and Tumor Necrosis Factor Alpha Production

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

High paracellular nutrient absorption in intact bats is associated with high paracellular permeability in perfused intestinal segments

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Ciclagem de nutrientes em mangueira

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Physiological performances of two populations of Compsopogon caeruleus (Rhodophyta) to inorganic nitrogen and phosphorus impoverishment

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Rainwater major and trace element contents in Southeastern Brazil: an assessment of a sugar cane region in dry and wet period

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Soil and leaf nutrient content of tree species support deciduous forests on limestone outcrops as a eutrophic ecosystem

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)