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  • Renal tubule  (2)
  • 34  (1)
  • 1975-1979  (3)
  • 1945-1949
Document type
Keywords
Publisher
Years
  • 1975-1979  (3)
  • 1945-1949
Year
  • 1
    Electronic Resource
    Electronic Resource
    Collisional effects upon optical coherences: Experimental study in a xenon three-level system (1979)
    Springer
    Applied physics 20 (1979), S. 83-88 
    Details
    ISSN: 1432-0630
    Keywords: 32 ; 34 ; 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Laser induced nonlinear absorption profiles in a three-level system have been recorded to study the effect of elastic collisions upon optical coherences. In our particular system, the signal is due to a pure double-quantum term, where we have separated the effect of phase-interrupting collisions from the effect of velocity-changing collisions. Experimental results show that the effect of velocity-changing collisions is very small, and that broadening of the signal is due to phase-interrupting collisions mainly. We are able to determine the increase of the decay rate of the coherent superposition (the “coherence”) of two levels of same parity [Dγ 13/dp=(6.5±1) MHz/Torr] and an upper limit for the mean velocity change (ũ≲5m/s).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00901791
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The role of brush border enzymes in tubular reabsorption of disaccharides (1977)
    Springer
    Pflügers Archiv 371 (1977), S. 141-145 
    Details
    ISSN: 1432-2013
    Keywords: Renal tubule ; Disaccharide reabsorption ; Maltase ; Brush border enzymes ; Microperfusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Renal tubular reabsorption of maltose, sucose and lactose were studied in vivo et situ by continuous microperfusion of single proximal convolutions of rat kidney. The14C-label of maltose (2.5 mmol/l) was removed from the lumen of the proximal tubule at about the same rate as found for glucose. Maltose reabsorption was completely inhibited in presence of 30 mmol/l glucose or of 0.1 mmol/l phlorizin. Chemical analysis of the samples showed a complete conversion of maltose into glucose within a perfusion distance of 2 mm. It is concluded from these results that within the tubular lumen maltose is split very rapidly by a brush border glucosidase. The short half time of this process permits the breakdown product glucose to be almost completely reabsorbed subsequently within the proximal tubule. In contrast, sucrose and lactose were neither split nor reabsorbed by the tubule brush border.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00580782
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Amino acid reabsorption in the proximal tubule of rat kidney: Stereospecificity and passive diffusion studied by continuous microperfusion (1977)
    Springer
    Pflügers Archiv 367 (1977), S. 221-227 
    Details
    ISSN: 1432-2013
    Keywords: Amino acid transport ; Renal tubule ; Stereospecificity ; Passive diffusion ; Saturation kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Renal tubular reabsorption of glycine and of thel- andd-isomers of histidine, serine, phenylalamine, methionine, proline and cystine was investigated in vivo et situ by continuous microperfusion of single proximal convolutions of the rat kidney. In the case of glycine and thel-isomers, tubular reabsorption is saturable to a great extent. Thed-amino acids are reabsorbed much more slowly than the respectivel-forms. Furthermore in the case of methionine and perhaps also of proline, serine and phenylalanine, the fractional reabsorption decreases in the presence of high concentrations of thel-form. This indicates that thed-isomers also have a measurable affinity for the reabsorption mechanisms of the renal tubule. The very poor reabsorption ofd-amino acids in the presence of theirl-isomers indicates that simple passive diffusion plays only a relatively small role in tubular amino acid reabsorption. Permeability coefficients estimated from these findings are in the range from 1–5×10−7 cm2·s−1. These values are very similar to those found for other organic molecules of comparable molecular weights.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00581358
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    Paper (German National Licenses)
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