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Mostrando 13-18 de 18 artigos, teses e dissertações.
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13. The presence and absence of prosencephalic cell groups relaying striatal information to the medial and lateral thalamus in tenrec
Although there are remarkable differences regarding the output organization of basal ganglia between mammals and non-mammals, mammalian species with poorly differentiated brain have scarcely been investigated in this respect. The aim of the present study was to identify the pallidal neurons giving rise to thalamic projections in the Madagascar lesser hedgeho
Blackwell Science Inc.
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14. Accumulation of Major Histocompatibility Complex Class II Molecules in Mast Cell Secretory Granules and Their Release upon Degranulation
To investigate the relationship between major histocompatibility complex (MHC) class II compartments, secretory granules, and secretory lysosomes, we analyzed the localization and fate of MHC class II molecules in mast cells. In bone marrow-derived mast cells, the bulk of MHC class II molecules is contained in two distinct compartments, with features of
The American Society for Cell Biology.
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15. Electrical Potential Differences in Cells of Barley Roots and Their Relation to Ion Uptake 1
Single cell electropotentials of barley (Hordeum vulgare L., cv. `Compana') root cortex were measured at different external concentrations of KCl in the presence of Ca2+. The roots were low in salt from seedlings grown on 0.5 mm aerated CaSO4 solution. Thus, the conditions were equivalent to those used to define the dual mechanisms found with radioactive tra
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16. The Sources of Carbon and Nitrogen Supplying Leaf Growth. Assessment of the Role of Stores with Compartmental Models1
Patterns of synthesis and breakdown of carbon (C) and nitrogen (N) stores are relatively well known. But the role of mobilized stores as substrates for growth remains less clear. In this article, a novel approach to estimate C and N import into leaf growth zones was coupled with steady-state labeling of photosynthesis (13CO2/12CO2) and N uptake (15NO3−/14N
American Society of Plant Biologists.
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17. Rubidium and sodium permeability of the ATP-sensitive K+ channel in single rat pancreatic beta-cells.
1. The patch-clamp method has been used to study the selectivity of single ATP-sensitive potassium channels in excised membrane patches from dissociated rat pancreatic beta-cells. 2. In symmetrical K+ concentrations the current-voltage relation of this channel showed slight inward rectification. The K+ permeability coefficient was 1.05 x 10(-13) cm3/s ([K+]o
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18. Ca2(+)-activated K+ channels in human B lymphocytes and rat thymocytes.
1. Previous evidence for the existence of Ca2(+)-activated K+ channels in lymphocytes comes from measurements using voltage-sensitive dyes and from tracer flux studies. We have now directly measured these channels in human tonsillar B lymphocytes and rat thymocytes in single-channel recordings from cell-attached and excised patches. 2. In cell-attached recor