Influx Of Nutrients
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Root morphology and kinetics of Zn absorption by roots of common bean influenced by Zn status of the root environment
ABSTRACT Understanding the kinetics of Zn absorption by roots and its effect on morphology of this organ is relevant for improving crop management, but still poorly studied for common beans. Therefore, an experiment was conducted in a hydroponic system with five initial concentrations of Zn (CZnI): 0.0; 1.0; 4.0; 16.0 and 48.0 µmol L-1. The experiment was i
Rev. Ceres. Publicado em: 2021-08
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2. Estuary Adjacent to a Megalopolis as Potential Disrupter of Carbon and Nutrient Budgets in the Coastal Ocean
The goals were to estimate nutrients and carbon flow rates between Guanabara Bay and the adjacent coastal waters, to characterize the provenance of the exported/imported organic matter. Samples were collected from different depths over 25 h in two seasons at the bay entrance. Measurements included physicochemical parameters, nutrients, chlorophylls, dissolve
J. Braz. Chem. Soc.. Publicado em: 2016-10
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3. Reúso de efluente de esgoto sanitário anaeróbio e nitrificado em irrigação de roseiras / Reuse of anaerobic and nitrified wastewater effluents for irrigation of roses
Wastewater secondary treatment plants effluent may contain, yet, nutrients in amounts harmful to the environment. These effluents discharging can cause eutrophication in receiving waters, making it unsuitable for intended uses, such as provision for human consumption, leisure activities, etc. Besides the problem of eutrophication, there is the difficulty to
Publicado em: 2011
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4. Joint uptake kinetics of phosphorus, potassium, calcium and magnesium and nutritional efficiency of macronutrients of eucalyptus clones. / CinÃtica de absorÃÃo conjunta de fÃsforo, potÃssio, cÃlcio e magnÃsio e eficiÃncia nutricional de macronutrientes de clones de eucalipto
Os objetivos do presente trabalho foram avaliar a morfologia radicular, a produÃÃo de biomassa, a eficiÃncia nutricional, bem como determinar os parÃmetros cinÃticos (Vmax, Km e Cmin) da absorÃÃo conjunta de P, K, Ca e Mg e analisar o influxo desses nutrientes em mudas de clones de eucalipto. O experimento foi conduzido em casa de vegetaÃÃo e cÃmar
Publicado em: 2009
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5. Immunopathology of giardiasis: the role of lymphocytes in intestinal epithelial injury and malfunction
T lymphocyte-mediated pathogenesis is common to a variety of enteropathies, including giardiasis, cryptosporidiosis, bacterial enteritis, celiac's disease, food anaphylaxis, and Crohn's disease. In giardiasis as well as in these other disorders, a diffuse loss of microvillous brush border, combined or not with villus atrophy, is responsible for disaccharidas
Memórias do Instituto Oswaldo Cruz. Publicado em: 2005-03
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6. Electrodiffusional Uptake of Organic Cations by Pea Seed Coats. Further Evidence for Poorly Selective Pores in the Plasma Membrane of Seed Coat Parenchyma Cells
In developing seeds, the permeability of the plasma membrane of seed coat parenchyma cells is crucial for the supply of nutrients to the embryo. Here, we report characteristics of the transport of the organic cation choline and the basic amino acid l- histidine (His; cation at pH 5, electroneutral at pH 7) into isolated seed coats of pea (Pisum sativum). Sup
American Society of Plant Physiologists.
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7. H+/solute-induced intracellular acidification leads to selective activation of apical Na+/H+ exchange in human intestinal epithelial cells
The intestinal absorption of many nutrients and drug molecules is mediated by ion-driven transport mechanisms in the intestinal enterocyte plasma membrane. Clearly, the establishment and maintenance of the driving forces — transepithelial ion gradients — are vital for maximum nutrient absorption. The purpose of this study was to determine the nature of i
American Society for Clinical Investigation.
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8. Small Molecular Drug Transfer across the Blood-Brain Barrier via Carrier-Mediated Transport Systems
Summary: Because of the physiological nature of the blood-brain barrier (BBB), transport of chemical compounds between blood and brain has been widely believed to occur by means of passive diffusion, depending upon the lipophilicity of the compounds. However, discrepancies exist between the lipophilicity and apparent BBB permeation properties in many cases,
The American Society for Experimental NeuroTherapeutics.
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9. Advantages of external periodic events to the evolution of biochemical oscillatory reactions
We compare, by calculations on a simple model of glycolysis, the evolutionary development of oscillatory reaction mechanisms in the presence and absence of external periodic events, such as an oscillatory or constant influx of glucose in an open reaction system. The chosen model has autonomous oscillations for given choices of the parameters of the feedb
National Academy of Sciences.
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10. Single islet beta-cell stimulation by nutrients: relationship between pyridine nucleotides, cytosolic Ca2+ and secretion.
It is generally believed that the initiation of insulin secretion by nutrient stimuli necessitates the generation of metabolic coupling factors, leading to membrane depolarization and the gating of voltage-sensitive Ca2+ channels. To establish this sequence of events, the kinetics of endogenous fluorescence of reduced pyridine nucleotides [NAD(P)H], reflecti
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11. AtKC1, a silent Arabidopsis potassium channel α-subunit modulates root hair K+ influx
Ion channels in roots allow the plant to gain access to nutrients. The composition of the individual ion channels and the functional contribution of different α-subunits is largely unknown. Focusing on K+-selective ion channels, we have characterized AtKC1, a new α-subunit from the Arabidopsis shaker-like ion channel family. Promoter-β-glucuronidase (GUS)
The National Academy of Sciences.
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12. Characterization of an anion-permeable channel from sugar beet vacuoles: effect of inhibitors
The vacuole occupies 25-95% of the plant cell volume and plays an essential role in maintaining cytoplasmic homeostasis of nutrients and ions. Recent patch-clamp studies identified ion channels and electrogenic pumps as pathways for the movement of ions and metabolites across the vacuolar membrane (tonoplast). At high cytoplasmic Ca2+ (>10-6 M) and negative