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  • Boleophthalmus boddaerti  (3)
  • 62C05  (1)
  • Springer  (4)
  • 1990-1994  (4)
  • 1960-1964
  • 1950-1954
Collection
Keywords
Publisher
  • Springer  (4)
Years
  • 1990-1994  (4)
  • 1960-1964
  • 1950-1954
Year
  • 1
    Electronic Resource
    Electronic Resource
    Adaptive estimates of linear functionals (1994)
    Springer
    Probability theory and related fields 98 (1994), S. 261-275 
    Details
    ISSN: 1432-2064
    Keywords: 62C05 ; 62E20 ; 62J02 ; 62G05 ; 62M99
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary Given a collection of nested closed, convex symmetric sets and a linear functional, we find estimates which are within a logarithm term of being simultaneously asymptotically minimax. Moreover, these estimates can be constructed so that the loss of this logarithm term only occurs on a small subset of functions. These estimates are quasi-optimal since there do not exist estimators which do not lose a logarithm term on some part of the parameter spaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01192517
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  • 2
    Electronic Resource
    Electronic Resource
    Osmoregulation in the mudskipper,Boleophthalmus boddaerti I. Responses of branchial cation activated and anion stimulated adenosine triphosphatases to changes in salinity (1991)
    Springer
    Fish physiology and biochemistry 9 (1991), S. 63-68 
    Details
    ISSN: 1573-5168
    Keywords: Boleophthalmus boddaerti ; mudskipper ; osmoregulation ; Na+ ; K+-ATPase ; HCO3 − ; Cl−-ATPase ; carbonic anhydrase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The mudskipperB. boddaerti, was able to survive in waters of intermediate salinities (4–27‰). Fish submerged in dechlorinated tap water suffered 60% mortality by the fifth day while 60% of those in 100% sea-water (sw) died after the third day of exposure. After being submerged in 50% or 80% sw for 7 days, the plasma osmolality, plasma Na+ and Cl− concentrations and the branchial Na+ and K+ activated adenosine triphosphatase (Na+,K+-ATPase) activity were significantly higher than those of fish submerged in 10% sw for the same period. However, the activities of the branchial HCO3 − and Cl− stimulated adenosine triphosphatase (HCO3 −,Cl−-ATPase) and carbonic anhydrase of the latter fish were significantly greater than those of the former. Such correlation suggests that Na+,K+-ATPase is important for hyperosmotic adaptation in this fish while HCO3 −-Cl−-ATPase and carbonic anhydrase may be involved in hypoosmotic survival.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01987612
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  • 3
    Electronic Resource
    Electronic Resource
    Osmoregulation in the mudskipper,Boleophthalmus boddaerti II. transepithelial potential and hormonal control (1991)
    Springer
    Fish physiology and biochemistry 9 (1991), S. 69-75 
    Details
    ISSN: 1573-5168
    Keywords: Boleophthalmus boddaerti ; mudskipper ; osmoregulation ; hormone ; cortisol ; prolactin ; Na+,K+-ATPase ; HCO3 − ; Cl−-ATPase ; transepithelial potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Boleophthalmus boddaerti submerged in 10%, 50% and 80% seawater (sw) for 7 days, had whole body transepithelial potentials (TEP) of 3.3, 18.3 and 22.9 mV, respectively. Hypophysectomy significantly decreased the TEP ofB. boddaerti and reversed the polarity of the TEP of the fish exposed to 10% sw. Hypophysectomy also significantly decreased the branchial Na+-K+ activated adenosine triphosphatase (Na+,K+-ATPase) activity but increased the activity of branchial HCO3 −-Cl− stimulated adenosine triphosphatase (HCO3 −,Cl−-ATPase) inB. boddaerti exposed to 10% sw. However, survival in 10% sw was not significantly impaired by hypophysectomy and no significant change in plasma osmolality and plasma Na+ and Cl− concentrations was observed. Various doses of ovine-prolactin or salmon-prolactin were unable to restore the TEP of hypophysectomizedB. boddaerti in 10% sw to that of the sham-operated fish. However, cortisol increased TEP to a positive value in hypophysectomizedB. boddaerti, though it was still lower than the sham-operated control. Cortisol treatment also affected the plasma osmolality, plasma Na+ and Cl− contents and branchial Na+,K+-ATPase and HCO3 −,Cl−-ATPase activities. Overall, the hormonal control of osmoregulation inB. boddaerti appeared to differ from that of other teleosts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01987613
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  • 4
    Electronic Resource
    Electronic Resource
    A comparative study on the responses of the gills of two mudskippers to hypoxia and anoxia (1993)
    Springer
    Journal of comparative physiology 163 (1993), S. 487-494 
    Details
    ISSN: 1432-136X
    Keywords: Glycogen ; Lactate ; Pasteur effect ; Boleophthalmus boddaerti ; Periophthalmodon schlosseri
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A comparison of branchial enzyme profiles indicates that the gills of Periophthalmodon schlosseri would have a greater capacity for energy metabolism through glycolysis than those of Boleophthalmus boddaerti. Indeed, after exposure to hypoxia, or anoxia, there were significant increases in the lactate content in the gills of P. schlosseri. In addition, exposure to hypoxia or anoxia significantly lowered the glycogen level in the gills of this mudskipper. It can be deduced from these results that the glycolytic flux was increased to compensate for the decrease in ATP production through anaerobic glycolysis. Different from P. schlosseri, although there was an increase in lactate production in the gills of B. boddaerti exposed to hypoxia, there was no significant change in the branchial glycogen content, indicating that a reversed Pasteur effect might have occurred under such conditions. In contrast, anoxia induced an accumulation of lactate and a decrease in glycogen in the gills of B. boddaerti. Although lactate production in the gills of these mudskippers during hypoxia was inhibited by iodoacetate, the decreases in branchial glycogen contents could not account for the amounts of lactate formed. The branchial fructose-2,6-bisphosphate contents of these mudskippers exposed to hypoxia or anoxia decreased significantly, leaving phosphofructokinase and glycolytic rate responsive to cellular energy requirements under such conditions. The differences in response in the gills of B. boddaerti and P. schlosseri to hypoxia were possibly related to the distribution of phosphofructokinase between the free and bound states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346933
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