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Inadequate maternal vascular response to placentation in pregnancies complicated by pre-eclampsia and by small-for-gestational age infants (1986)

KHONG, T. Y. ; WOLF, F. ; ROBERTSON, W. B. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

BJOG 93 (1986), S. 0

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ISSN: 1471-0528

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: Summary. An examination of the maternal vascular response to placentation shows that physiological changes in the placental bed normally extend from the decidua into the inner myometrium. In pre-eclampsia and in a proportion of pregnancies with small-for-gestational age infants (SGA) the physiological changes are restricted to the decidual segments alone. In addition, complete absence of physiological changes throughout the entire length of some spiral arteries is seen in pre-eclampsia and SGA. This new observation is confirmed in a study of basal plates of placentas from abnormal pregnancies. Intraluminal endovascular trophoblast may be seen in the placental bed spiral arteries in the third trimester in pre-eclampsia and SGA, a feature not seen beyond the second trimester in normal pregnancy. These findings point to a defect in the normal interaction between migratory trophoblast and maternal uterine tissues in pre-eclampsia and in SGA.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1471-0528.1986.tb07830.x

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Influence of pressure and crystallization rate on the surface microhardness of high-density polyethylene (1986)

Baltá Calleja, F. J. ; Rueda, D. R. ; Peña, J. Garcia ; [et al.]

Springer

Journal of materials science 21 (1986), S. 1139-1144

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ISSN: 1573-4803

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract The indentation microhardnessMH of high-density polyethylene crystallized at different pressuresp and crystallization ratesν c has been investigated. The results confirm thatMH is an increasing function of lamellar thickness and therefore of densityρ. The rate of increase depends on the crystallization conditionsp andν c. Crystallization at high pressure leads toMH values considerably higher than those of samples prepared under atmospheric pressure. The results are discussed in terms of compressed amorphous regions contributing to an elastic release after removal of the indenter. For samples crystallized under different pressures the hardness value turns out to be nearly independent of the elastic modulusE. For samples crystallized at different ratesν c there is a steady decrease of microhardness with increasingν c (decrease of lamellar thickness) but no simple relationship withE. With higher ratesν c the appearance of strained tie molecules provokes a rapid increase ofE whileMH decreases further because the crystals become smaller.