Nutrient Recycling
Mostrando 13-24 de 35 artigos, teses e dissertações.
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13. Monitoramento do uso da terra e dos níveis de nutrientes do solo no Sistema Integrado de Produção Agroecológica utilizando geoprocessamento. / Monitoring of land use and soil nutrients levels on an integrated agroecological production system by image processing.
Agroecological production systems are more complex than conventional ones, since a series of crops follow in sequence or are intercropped to achieve high diversity and maximize soil nutrient recycling. The full understanding of these systems require systemic analyses and therefore, adequate tools. To understand soil fertility evolution, heterogeneity should
Publicado em: 2007
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14. Dinâmica bacteriana em sedimentos costeiros de Ubatuba, São Paulo / Bacterial dynamics in coastal sediments of Ubatuba, São Paulo
Coastal sediments are characterized by high organic matter contents. Bacteria play a key role in organic matter decomposition and are essential in the nutrient recycling process. Moreover, represent an important food source for meio- and macrofaunal organisms. The present study aimed to evaluate the abundance and biomass of the benthic bacterial community in
Publicado em: 2007
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15. Influence of vegetation cover on nutrient cycling in soil solution at the area of Manaus AM. / Influência da cobertura vegetal na ciclagem de nutrientes via solução do solo na região de Manaus - AM.
The main objective of this study was to contribute for the sustainability of land use in the central Amazon, evaluating the influence of vegetation cover on nutrient concentrations in soil solution that is, on the amounts of cations, anions and dissolved organic carbon (DOC). Using a primary forest as reference, we compared these concentrations with those in
Publicado em: 2005
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16. Transcriptome Profiling of the Response of Arabidopsis Suspension Culture Cells to Suc Starvation1[w]
Upon encountering nutrient stress conditions, plant cells undergo extensive metabolic changes and induce nutrient recycling pathways for their continued survival. The role of nutrient mobilization in the response of Arabidopsis suspension cells to Suc starvation was examined. Vacuolar autophagy was induced within 24 h of starvation, with increased expression
American Society of Plant Biologists.
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17. Microbial diversity, producer-decomposer interactions and ecosystem processes: a theoretical model.
Interactions between the diversity of primary producers and that of decomposers--the two key functional groups that form the basis of all ecosystems--might have major consequences on the functioning of depauperate ecosystems. I present a simple ecosystem model in which primary producers (plants) and decomposers (microbes) are linked through material cycling.
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18. RapA, a bacterial homolog of SWI2/SNF2, stimulates RNA polymerase recycling in transcription
We report that RapA, an Escherichia coli RNA polymerase (RNAP)-associated homolog of SWI2/SNF2, is capable of dramatic activation of RNA synthesis. The RapA-mediated transcriptional activation in vitro depends on supercoiled DNA and high salt concentrations, a condition that is likely to render the DNA superhelix tightly compacted. Moreover, RapA activates t
Cold Spring Harbor Laboratory Press.
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19. Autophagic Nutrient Recycling in Arabidopsis Directed by the ATG8 and ATG12 Conjugation Pathways1
Autophagy is an important mechanism for nonselective intracellular breakdown whereby cytosol and organelles are encapsulated in vesicles, which are then engulfed and digested by lytic vacuoles/lysosomes. In yeast, this encapsulation employs a set of autophagy (ATG) proteins that direct the conjugation of two ubiquitin-like protein tags, ATG8 and ATG12, to ph
American Society of Plant Biologists.
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20. Exploitation of pollen by mycorrhizal mycelial systems with special reference to nutrient recycling in boreal forests.
Very large quantities of pollen are released annually by wind-pollinated trees, which dominate northern forest ecosystems. Since pollen is enriched in both nitrogen and phosphorus, this recurrent pulse of deposition constitutes a significant potential source of these elements in what are known to be severely nutrient-limited systems. Here, we demonstrate for
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21. Effects of probiotics and commensals on intestinal epithelial physiology: implications for nutrient handling
Eukaryotes and prokaryotes have developed mutually beneficial relationships over millennia of evolutionary adaptation. Bacteria in our gut rely on our diet and the protected environment of our bodies just as our health depends on byproducts of microbial metabolism. Microorganisms of the gut microbiota ferment carbohydrates into short-chain fatty acids, conve
Blackwell Science Inc.
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22. The Potassium-Dependent Transcriptome of Arabidopsis Reveals a Prominent Role of Jasmonic Acid in Nutrient Signaling1[w]
Full genome microarrays were used to assess transcriptional responses of Arabidopsis seedlings to changing external supply of the essential macronutrient potassium (K+). Rank product statistics and iterative group analysis were employed to identify differentially regulated genes and statistically significant coregulated sets of functionally related genes. Th
American Society of Plant Biologists.
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23. Eutrophication of aquatic ecosystems: Bistability and soil phosphorus
Eutrophication (the overenrichment of aquatic ecosystems with nutrients leading to algal blooms and anoxic events) is a persistent condition of surface waters and a widespread environmental problem. Some lakes have recovered after sources of nutrients were reduced. In others, recycling of phosphorus from sediments enriched by years of high nutrient inputs ca
National Academy of Sciences.
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24. Nitrogen recycling and nutritional provisioning by Blattabacterium, the cockroach endosymbiont
Nitrogen acquisition and assimilation is a primary concern of insects feeding on diets largely composed of plant material. Reclaiming nitrogen from waste products provides a rich reserve for this limited resource, provided that recycling mechanisms are in place. Cockroaches, unlike most terrestrial insects, excrete waste nitrogen within their fat bodies as u
National Academy of Sciences.