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  • Red blood cells  (3)
  • 21.60.-n  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Glycine uptake by trout (Salmo trutta) red blood cells (1993)
    Springer
    The journal of membrane biology 134 (1993), S. 251-259 
    Details
    ISSN: 1432-1424
    Keywords: Glycine uptake ; Trout (Salmo truttd) ; Red blood cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The present study demonstrates the presence of different amino acid carriers in the membrane of trout red cells. Most glycine is taken up through the Na+-dependent system ASC, although the nearly specific Gly system is also active. Besides these carriers, glycine is taken up by means of Na+-independent transporters, system l being the most important. A system asc of high affinity and low capacity has been found, and band 3 is unable to transport glycine under physiological conditions. These results suggest that although all these carriers are already present in primitive vertebrates, several differences exist in their properties with respect to those found in mammalian cells. We would like to express our sincere thanks to Mr. Antonino Clemente (Piscifactoria de Bagà, Medi Natural, Generalitat de Catalunya) for his help and logistical assistance and to Mr. Robin Rycroft for his editorial help.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234506
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  • 2
    Electronic Resource
    Electronic Resource
    Presence of an X AG − carrier in frog (Rana esculenta) red blood cells (1994)
    Springer
    The journal of membrane biology 139 (1994), S. 97-102 
    Details
    ISSN: 1432-1424
    Keywords: l-glutamic uptake ; Acidic amino acids ; System X AG − ; Red blood cells ; Frog Rana esculenta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Evidence is presented that the high levels of internal l-glutamic and l-aspartic acid in frog Rana esculenta red blood cells are due to the existence of a specific carrier for acidic amino acids of high affinity K m = 3 μm and low capacity (Vmax) 0.4 μmol l-Glu · Kg−1 dry cell mass · 10 min−1. It is Na+ dependent and the incorporation of l-glutamic acid can be inhibited by l and d-aspartate and l-cysteic acid, while d-glutamic does not inhibit. Moreover, this glutamic uptake shows a bell-shaped dependence on the external pH. All these properties show that this carrier belongs to the system X AG − family. Besides the incorporation through this system, l-glutamic acid is also taken up through the ASC system, although, under physiological conditions, this transport is far less important, since it has relatively low affinity K m 39 μm but high capacity (V max) 1.8 μmol l-Glu · Kg−1 dry cell mass · 10 min−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00232428
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Na+-independent l-alanine uptake by trout cells. Evidence for the existence of at least two functionally different asc systems (1994)
    Springer
    The journal of membrane biology 140 (1994), S. 189-196 
    Details
    ISSN: 1432-1424
    Keywords: Alanine uptake ; Red blood cells ; Peripheral blood lymphocytes ; Isolated hepatocytes ; asc System ; Trout (Salmo trutta)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The Na+-independent uptake of l-alanine has been studied in trout red blood cells, isolated hepatocytes and peripheral blood lymphocytes. The present study shows the existence of two functionally different Na+-independent systems for short chain neutral amino acids in these cells. They are designated as asc systems because of their resemblance to systems described in other cell types. Besides their independence of sodium and a rough similarity in substrate preference, the most important property shared by the two carriers is a lack of trans-stimulation, allowing further differentiation from system L. One of them is an unusually stereospecific carrier present in red blood cells, the other is less restrictive and present in hepatocytes and peripheral blood lymphocytes. Extracellular acid pH increases the incorporation to red blood cells, while it slightly depresses the uptake in the other cells. From the data presented, it is not possible, at first, to classify these carriers as asc 1 or asc 2 systems. Moreover, the system present in red cells resembles that found in the nonerythroid cells, BSC-1, while there is no clear parallelism between the system found in hepatocytes/lymphocytes and any of those described previously.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233707
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  • 4
    Electronic Resource
    Electronic Resource
    Interplay of pairing and quadrupole correlations in deformed nuclei (1993)
    Springer
    The European physical journal 346 (1993), S. 269-274 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.-n ; 25.70.Hi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study pairing correlations in deformed nuclei in the framework of the Nilsson+BCS theory. As in the spherical case, the pairing interaction is found to induce strong spacial correlations between the partners of each paired couple. The presence of the deformed mean field gives rise to a non-spherical pair field, whose deformation is governed by the properties of a few single-particle orbitals around the Fermi surface and does not necessarily follow the shape of the mean field. Multipole expansion of the pair field yields all the pair densities associated with the direct two-particle transfer processes to the members of the g.s. rotational band in the A+2 system. The interplay of the deformations of the mean and the pair fields can lead to different relative magnitudes and phases of these densities and therefore to different excitation patterns of the rotational bands in two-particle transfer reactions. In the case of non-collective twoquasiparticles and bands the associated pair densities display large components with high multipoles and the associated transfer processes may be favoured in heavy-ion collisions by kinematical conditions. Examples corresponding to both prolate and oblate cases are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292516
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    Paper (German National Licenses)
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