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  • 1990-1994  (2)
  • Glomerular capillary pressure  (1)
  • acidic and bifunctional catalysts  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric nephrology 5 (1991), S. 88-93 
    ISSN: 1432-198X
    Keywords: Glomerular hemodynamic adaptations ; Renal mass reduction ; Chronic renal failure ; Glomerular capillary pressure ; Therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Although experiments in the rat suggest that glomerular hemodynamic alterations following a reduction of renal mass may be implicated in the progression of chronic renal failure, we argue that the deleterious effects of similar adaptations in human renal disease are unproven. In the otherwise normal solitary kidney the supranormal glomerular filtration rate (GFR) remains stable over the longterm, and in early diabetic nephropathy which is also accompanied by hyperfiltration, renal deterioration cannot be dissociated from a rise in systemic blood pressure. In patients with miscellaneous renal diseases and a depressed basal GFR there is indirect evidence that hyperfiltration might occur in some of the remnant glomeruli. However, at present there is little conclusive evidence to indicate that therapies which might normalize glomerular hemodynamics, e.g., dietary protein restriction, have any effect on progression of renal disease, or that angiotensin converting-enzyme inhibitors, which lower glomerular capillary pressure, have any advantage over other antihypertensive agents which are equally efficacious in lowering systemic blood pressure.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-879X
    Keywords: Alkali-free synthesis zeolite ; [Ga]-ZSM-5 ; degalliation ; acidic and bifunctional catalysts ; propane aromatization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Propane aromatization (530°C, 1 atm) was used as a reaction model to evaluate the effect of the calcination temperature on the catalytic properties of an as-synthesized [Ga1.3]-ZSM-5 zeolite obtained from alkali-free media and calcined at two different temperatures: 530°C (C-530) and 750°C (C-750). Results show that in spite of its lower acidity, C-750 is more active and selective toward aromatics than C-530. This is probably due to the fact that at higher temperature the decomposition of organic compounds used during the zeolite synthesis is accompanied by a partial degalliation of the zeolitic support leading to the production of a bifunctional x“Ga2O3” /H-[Gay-ZSM-5(2x+y=1.3)catalyst.
    Type of Medium: Electronic Resource
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