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  • 1995-1999  (3)
  • 03.75.Dg  (1)
  • Ca2+  (1)
  • Cerebrovascular disease  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 60 (1995), S. 187-191 
    ISSN: 1432-0649
    Keywords: 42.50.Dv ; 03.75.Dg ; 03.75.Fi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The standard quantum limit is calculated for the atom-light interferometer. It is shown that the smallest detectable phase is $$\delta \phi _{\min } = \frac{1}{2}[N_{atoms} + 4N_{photons} )/N_{atoms} N_{photons} ]^{1/2} .$$ Therefore, in practical experiments, the accuracy is limited by the square root of the number of atoms. We propose a novel correlated atom-photon state interferometer which makes a transition to the Heisenberg limit, δφmin ∝ 1/N atoms, as the atoms approach a Bose condensate. Such an interferometer may serve as a sensitive probe of the onset of Bose condensation. Finally, we point out that the correlated atom-photon state preparation scheme we propose may be used in a different way to approach the Heisenberg limit for non-Bose-condensed atoms.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5036
    Keywords: Al stress ; Ca2+ ; H+ pump ; K+ efflux ; low pH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract H+-ATPase activity of a plasma membrane-enriched fraction decreased after the treatment of barley (Hordeum vulgare) seedlings with Al for 5 days. A remarkably high level of Al was found in the membrane fraction of Al-treated roots. A long-term effect of Al was identified as the repression of the H+-ATPase of plasma membranes isolated from the roots of barley and wheat (Triticum aestivum) cultivars, Atlas 66 (Al-tolerant) and Scout 66 (Al-sensitive). To monitor short-term effects of Al, the electrical membrane potentials across plasma membranes of both wheat cultivars were compared indirectly by measuring the efflux of K+ for 40 min under various conditions. The rate of efflux of K+ in Scout was twice that in Atlas at low pH values such as 4.2. Vanadate, an inhibitor of the H+-ATPase of the plasma membrane, increased the efflux of K+. Al repressed this efflux at low pH, probably through an effect on K+ channels, and repression was more pronounced in Scout. Al strongly repressed the efflux of K+ irrespective of the presence of vanadate. Ca2+ also had a repressive effect on the efflux of K+ at low pH. The effect of Ca2+, greater in Scout, might be related to the regulation of the net influx of H+, since the effect was negated by vanadate. The results suggest that extracellular low pH may cause an increase in the influx of H+, which in turn is counteracted by the efflux of K+ and H+. These results suggest that the ability to maintain the integrity of the plasma membrane and the ability to recover the electrical balance at the plasma membrane through a net influx of H+ and the efflux of K+ seem to participate in the mechanism of tolerance to Al stress under acidic conditions.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1437-7799
    Keywords: Key words: Hemodialysis ; Survival analysis ; Cerebrovascular disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background. The overall survival rate and contributory factors were examined in patients undergoing hemodialysis in one dialysis program. The clinical profiles of dialysis patients who suffered from cerebro- and cardiovascular diseases (CCVD) were also studied. Methods. Data were available for 1064 patients who had received hemodialysis treatment for more than 3 months in our program (17 centers) in Miyazaki, Japan, between 1971 and 1994. Results. The respective 3-, 5-, and 10-year actuarial survival rates were 85%, 79%, and 66%. The Cox proportional hazard model identified three variables: age at start of hemodialysis (adjusted relative hazard [RH], 1.05), sex (RH, 1.42 for males), and type of underlying renal disease (RH, 1.00 for chronic glomerulonephritis, 2.80 for diabetes mellitus, 1.59 for nephrosclerosis), as being significantly associated with survival. Patients with CCVD had a high incidence of cerebral hemorrhage (8.7 per 1000 person-years). Patients whose first CCVD episode occurred within 36 months of starting hemodialysis were older, and more frequently had diabetes mellitus or nephrosclerosis and suffered from cerebral infarction. Long-term hemodialysis patients with CCVD more frequently had chronic glomerulonephritis as the underlying disease and had a higher incidence of cerebral hemorrhage. Conclusion. Age, sex, and underlying renal disease were independent factors that contributed to the mortality of the hemodialysis patients. There was a high incidence of CCVD among the hemodialysis patients, but the etiology of CCVD may differ depending on the underlying renal disease.
    Type of Medium: Electronic Resource
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