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  • 1995-1999  (2)
  • 1990-1994  (1)
  • 1999  (2)
  • 1994  (1)
  • 1
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The factors that can influence the outcome of orthotopic liver transplantation (OLT) are numerous. The purpose of this study was to determine the effects of recipient preoperative factors on patient mortality. Between April 1986 and April 1998 a total of 600 OLTs were performed in our institution. We retrospectively reviewed our first 203 consecutive primary adult OLTs with at least 4 years of follow-up. A case-control comparison was performed between survivors and nonsurvivors, and differences in recipient variables were studied for their correlation with patient mortality. A logistic regression analysis was also performed. Mortality was significantly increased among those with fulminant hepatic failure (FHF) (66.6%, p= 0.003), primary cancer (63.1%, p= 0.018), females (46.1%, p= 0.043), encephalopathy grade IV (72.7%, p= 0.012), recipients under respiratory support (69.2%, p= 0.031), and ABO-incompatible transplants (80%, p= 0.05). FHF, primary cancer, and female gender were the only variables that had a significant association with mortality in the logistic regression analysis. A higher incidence of prolonged respiratory support, bacterial and fungal infections, pneumonia, and chronic rejection contributed to the lower outcome observed in females. These results stress the need for continuous evaluation of the selection criteria of candidates for OLT suffering from primary cancer and FHF. The impact of recipient gender on mortality warrants further analysis but suggests that in the future more attention must be paid to the influence of this factor on the final outcome of OLT.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5052
    Keywords: oxygen measurements ; PAM fluorescence ; photoinhibition ; Porphyra ; rhodophyta ; ultraviolet radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photosynthetic oxygen production and PAM fluorescence measurements were used to follow photoinhibition in the red macroalga Porphyra umbilicalis. Exposure to simulated solar radiation caused inhibition of the effective photosynthetic quantum yield from which the thalli partially recovered in the shade in subsequent hours. There were no significant differences between samples exposed to unfiltered radiation and those exposed to radiation from which increasing portions of UV radiation had been removed indicating that the thalli are well adapted to current levels of solar PAR and UV radiation. This notion was supported by the finding of high concentrations of UV screening pigments which were even enhanced by exposure to increased UV radiation. However, when exposed to (only) UV radiation about 50% higher than that encountered by the organisms in their natural habitat, the photosynthetic yield decreased slowly and did not show any recovery even when the degree of inhibition did not exceed 10%.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-5176
    Keywords: Dunaliella viridis ; subsidiary energy quantification ; growth ; carotenoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An account is given of the influence of different levels of mechanical energy, in the form of bubbling, on the growth of the microalgaDunaliella viridis when other variables (e.g. temperature, nutrient supply, photon fluence) do not change. The extra energy was quantified accurately through the application of the classical equations of mass and energy conservation providing a method for the calculation of the energy efficiency of primary production related to the total energy input, in which photon fluence was found to be the most important. The specific growth rate (μ) of the population vs the input of auxiliary energy fits to a second order polynomial function with a maximum growth rate at 0.63 W m−2. The increase of maximal cell density follows a hyperbolic saturation kinetics, with saturation at those same values of extra energy. Both primary production and the efficiency of energy transformation inD. viridis vs the variation of total energy input fit to hyperbolic functions, reaching a maximum efficiency for primary production of 0.85%.
    Type of Medium: Electronic Resource
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