Microaggregates
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Micromorphology and Genesis of Soils from Topolitosequences in the Brazilian Central Plateau
ABSTRACT The micromorphology of deeply weathered soils (Ferralsols/ Latossolos ) from the Central Plateau of Brazil remains little studied, and its affiliation to different parent materials, poorly known. To clarify the processes of soil formation of these acric, gibbsitic, Fe-oxide rich Ferralsols, three lithotoposequences on local ultrabasic to basic intru
Rev. Bras. Ciênc. Solo. Publicado em: 09/09/2019
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2. Soil quality indicators under management systems in a Quilombola community in the Brazilian Cerrado
ABSTRACT: Soil management systems exert different effects on soil attributes, especially on the organic matter content, and, consequently, the soil aggregation. The aim of this study was to evaluate the impact of different land uses practiced by quilombola family farmers on water stable aggregates, glomalin and organic carbon in soil aggregates. Soil samples
Sci. agric. (Piracicaba, Braz.). Publicado em: 30/05/2019
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3. Rheological Parameters as Affected by Water Tension in Subtropical Soils
ABSTRACT Rheological parameters have been used to study the interaction between particles and the structural strength of soils subjected to mechanical stresses, in which soil composition and water content most strongly affect soil resistance to deformation. Our objective was to evaluate the effect of water tension on rheological parameters of soils with diff
Rev. Bras. Ciênc. Solo. Publicado em: 23/06/2016
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4. Chapadas do Alto Vale do Jequitinhonha, MG: II - mineralogia, micromorfologia e evolução da paisagem
As veredas são formações típicas que ocorrem no Cerrado brasileiro, principalmente nas áreas aplainadas denominadas chapadas. O objetivo deste trabalho foi caracterizar mineralógica e micromorfologicamente os solos de uma topossequência representativa da microbacia da Vereda Lagoa do Leandro, localizada no município de Minas Novas - MG, situada nas c
Revista Brasileira de Ciência do Solo. Publicado em: 2011-08
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5. Nature et propriétés de l'horizon diagnostic de Latosols du Plateau Central brésilien.
The Latosols correspond to about 40% of the Brazilian Central Plateau. They are characterized by low activity clay, little horizon differentiation, a weak macrostructure and a strong microgranular structure resulting in microaggregates 50 to 300um in size. Ten Latosols (L) were selected along a 350-km long regional toposequence across the South American Surf
2009.. Publicado em: 2011
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6. Estoque e qualidade da matéria orgânica do solo em áreas cultivadas com café sob sistemas agroflorestal e a pleno sol / Soil organic matter stock and quality in agroforestry and full sun coffee systems
Soil organic matter (SOM) restoring is considered a main goal in the enhancement of soil quality. The evaluation of changes in the SOM as a result of soil management practices is fundamental to identify strategies to increase agricultural production, avoiding soil degradation and decreasing the emission of greenhouse gases. In Brazil, no-tillage has been bro
Publicado em: 2009
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7. Relação solo-água-vegetação em uma toposseqüência localizada na Estação Ecológica de Assis, SP / Soil-water-vegetation relationships in a toposequence located in the Ecological Station of Assis, São Paulo, Brazil
The Cerrado bioma is being fragmented due to the human and agricultural occupation. To maintain the biodiversity, ecological corridors must be created by the revegetation and the restoration of the degraded areas. It can only be ameliorated upon the knowledge of the soils natural dynamics and distribution. The aim of this work was to characterize the b
Publicado em: 2006
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8. Erroneous values for the total white cell count and ESR in patients with cryoglobulinaemia.
Temperature dependent fluctuations in the erythrocyte sedimentation rate were noted during the assessment of one patient with symptomatic cryoglobulinaemia. Two patients with this condition were found to have erroneously high leucocyte counts when estimated by the Model S Coulter Counter. The artefact was directly related to the degree of exposure to cold be
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9. Molecular Ordering of the Initial Signaling Events of CD95
Binding of either ligand or agonistic antibodies to the death receptor CD95 (APO-1/Fas) induces the formation of the death-inducing signaling complex (DISC). We now show that signal initiation of CD95 in type I cells can be further separated into at least four distinct steps. (i) The first step is ligand-induced formation of CD95 microaggregates at the cell
American Society for Microbiology.
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10. Acetylcholine receptors are required for agrin-induced clustering of postsynaptic proteins
We have investigated the role of acetylcholine receptors (AChRs) in an early step of postsynaptic assembly at the neuromuscular synapse, the clustering of postsynaptic proteins induced by nerve-released agrin. To achieve this, we used two variants of C2 myotubes virtually lacking AChRs and C2 cells in which surface AChRs were down-regulated by AChR antibodie
Oxford University Press.
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11. Exchange of monooleoylphosphatidylcholine as monomer and micelle with membranes containing poly(ethylene glycol)-lipid.
Surface-grafted polymers, such as poly(ethylene glycol) (PEG), provide an effective steric barrier against surface-surface and surface-macromolecule interactions. In the present work, we have studied the exchange of monooleoylphosphatidylcholine (MOPC) with vesicle membranes containing 750 mol wt surface-grafted PEG (incorporated as PEG-lipid) from 0 to 20 m
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12. IR spectroscopic determination of gel state miscibility in long-chain phosphatidylcholine mixtures.
We report on the gel-state microaggregation in binary mixtures of diacylphosphatidylcholines over temperatures ranging from -19 degrees C to near the gel-to-liquid crystal transition. Microaggregates with lateral dimensions in the range 1-100 chains were detected and measured with an isotope infrared method that relates the splitting or the shape of the meth