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  • 1990-1994  (1)
  • 1970-1974  (2)
  • 1945-1949
  • 1930-1934
  • Pomatoceros triqueter  (2)
  • Childhood  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 113 (1971), S. 388-395 
    ISSN: 1432-0878
    Keywords: Pomatoceros triqueter ; Egg investments ; Fertilization reaction ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of unfertilized and fertilized egg investments ofPomatoceros triqueter is described. A characteristic feature is the presence of a hitherto unrecorded additional investment layer, inserted between the chorion and the “outer border layer”, which is referred to as the intermediate layer. The fertilization reaction consists of the release of cortical granule material into the perivitelline “space”, and the severing of the microvillous cytosome to “outer border layer” connections, thus allowing an increase in the width of the perivitelline “space”. More ridged corrugations are found on the outer surface of the investments in the fertilized as compared with the unfertilized condition.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 123 (1972), S. 486-495 
    ISSN: 1432-0878
    Keywords: Pomatoceros triqueter ; Cytokinesis ; Surface folding ; New surface membrane ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The first cleavage division of Pomatoceros triqueter eggs is described. Time-lapse microcinematographic and electron microscopic studies revealed that, prior to division, the plasma membrane was folded into pleats. These were not present after division. This fact pointed to an unfolding of the plasma membrane which enabled it to cover the increased surface area resulting from cleavage. It is suggested that the pre-cleavage folds are derived from the membranes of the cortical granules, which continue releasing their contents into the perivitelline region following fertilization and first division. Filamentous material in the form of a band was present subjacent to the plasma membrane in the region of the furrow. The individual filaments of this band measure 5 to 7 nm in cross section, the dimensions being similar to those described for other kinds of dividing cells.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 68 (1994), S. 514-518 
    ISSN: 1439-6327
    Keywords: Body surface area ; Anthropometry ; Liver disease ; Childhood ; Three-dimensional surface anthropometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Body surface area (BSA) is used in paediatrics to assess fluid requirement, drug doses, cardiac output and glomerular filtration rate. The aim of this study was to examine, in children with liver disease, the relationship between BSA determined by a traditional nomogram and BSA measured by a novel three-dimensional technique — Loughborough Anthropometric Shadow Scanner (LASS). Subjects were 16 children, mean age 8.1 (range 3.6–14.9) years, with a variety of liver diseases. Twenty-eight controls had a mean age of 7.1 (3.1–10.5) years. All had LASS scans performed as well as 21 anthropometric measurements taken by a single observer. There was a significant relationship between BSA (LASS) and BSA nomogram for liver-diseased children (r=0.99) and controls (r=0.96). The BSA nomogram values were significantly greater (P 〈 0.05) than BSA (LASS) for liver-diseased subjects by 10.1% (−0.35 to + 20.6; 95% confidence interval), and for controls by 9.6% (4.1–23.2). Best prediction of BSA (LASS) for liver-disease subjects used height, body weight and gluteal furrow circumference [r 2=0.997; standard estimated error (SEE) = 0.015 m2] and for controls used body weight alone (r 2=0.907; SEE=0.048 m2). BSA nomogram has no additional error in children with liver disease, but may overestimate BSA by 10% compared with a novel three-dimensional body surface scanning technique.
    Type of Medium: Electronic Resource
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