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  • 1990-1994
  • 1985-1989  (14)
  • 1987  (6)
  • 1986  (8)
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  • 1990-1994
  • 1985-1989  (14)
Year
  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 6 (1987), S. 525-527 
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Advances in contraception 3 (1987), S. 341-348 
    ISSN: 1573-7195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Resumé On a étudié les effets de l'administration par voie intravaginale d'une dose unique de prostaglandine A1 à des hamsters au début de la gestation. On a constaté au huitième jour qu'une dose unique de 1 mcg par animal, administrée au quatrième jour de gestation, avait inhibé l'apparition des grosseurs embryonnaires. On a constaté en outre une baisse significative (p〈0,01) de l'HSF, avec une augmentation (p〈0,03) de la concentration de prolactine sérique, mais aucun changement dans les niveaux de l'HL. La teneur en prolactine retrouvée dans l'hypophyse présentait une biasse significative (p〈0,0006), sans qu'il y ait eu de changement dans la teneur en HSF et HL. En outre, la concentration de progestérone dans le sérum et dans les ovaires était sensiblement réduite (respectivementp〈0,002 etp〈0,01). La baisse de la concentration de progestérone concidait avec l'absence de corps jaune et d'embryon. Aucune modification du poids des ovaires n'a cependant été observée. Ces résultats font apparaitre le potentiel de la prostagladine A1 en tant qu'agent inhibiteur de la gestation. Son action semble être celle d'un agent lutéolytique qui perturbe le complexe lutéotrope. (HSF: proportion de prolactine)
    Abstract: Resumen Se investigaron los efectos de una administración intravaginal de prostaglandina A1 en hamsters con embarazo temprano. Una sola dosis de 1 mcg/animal al 4° día del embarazo (P) inhibió la aparición de los edemas embriónicos cuando se los observó en el 8° día del embarazo. Se notó una caída significativa (p〈0,01) en FSH con un aumento (p〈0,03) en la concentración de prolactina y ningun cambio en los niveles de LH. E1 contenido de prolactina en la pituitaria mostró una disminución significativa (p〈0,0006) sin cambios en los niveles de FSH y LH. La concentración de progesterona en suero estuvo notablemente reducida (p〈0,002) asi como la de los ovarios (p〈0,01). La disminución en la concentración de progesterona coincidió con la ausencia de cuerpo lúteo y de embriones. Sin embargo, no se observó cambio en el peso ovárico. Estos resultados indican el potencial antigestante de la prostaglandina A1. Esta parece actuar como agente luteolítico, interrumpiendo el complejo luteotrópico (relación FSH:prolactina).
    Notes: Abstract The effects of a single administration of authentic prostaglandin A1 intravaginally in early pregnant hamsters were investigated. A single dose of 1 mcg/animal given on day 4 of pregnancy inhibited the appearance of embryonic swellings when observed on day 8 of pregnancy. A significant fall (p〈0.01) in FSH with a rise (p〈0.03) in prolactin concentration in the serum and no change in LH levels were observed. The pituitary content of prolactin showed a significant decrease (p〈0.0006) with no change in FSH and LH contents. Progesterone concentration in the serum was markedly reduced (p〈0.002), along with that of the ovaries (p〈0.01). The decline in progesterone concentration coincided with the absence of corpora lutea and the embryos. However, no change in ovarian weights was observed. These results indicate the contragestive potential of prostaglandin A1. It appears to act as a luteolytic agent by disrupting the luteotropic complex (FSH:prolactin ratio).
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 21 (1986), S. 737-743 
    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 Di-phasic xerogel-derived composites, such as SiO2AgCl, SiO2-AIPO4, SiO2-CePO4, SiO2 -Nd2O3, SiO2-CdS, SiO2CrPO4, SiO2-BaSO4 and SiO2-PbCrO4 have been characterized in detail by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and selected-area electron diffraction (SAED) techniques. The SiO2-AgCl photochromic composites with small amounts of AgCl did not show any crystallinity either by XRD or by SAED. Thin edges of these SiO2-AgCl composites did not reveal discrete AgCl particles because these are too small to be resolved even by TEM and are expected to be in the range 1.5 to 2.5 nm in size based on the pore size of silica gel. A few large AgCI-Ag particles precipitated on the outside of silica gel were, however, detected by TEM-SAED in silica gels with higher concentrations of AgCl. The SiO2-AIPO4 and SiO2-Nd2O3 composites are noncrystalline and did not show any periodic structure by TEM and SAED. Heat treatments to 400 or 600° C did not crystallize the AIPO4 or Nd2O3 phases. On the other hand, SiO2-CePO4 and SiO2-CdS composites showed lath-like particles of CePO4 and irregular particles of presumably CdS on the surfaces of silica gels. The SiO2-BaSO4 and SiO2-PbCrO4 composites showed crystals of BaSO4 and PbCrO4 which are too large to be incorporated in the silica gel pores. These results show that the size and crystallinity of a second phase within silica gels can be controlled by the appropriate manipulation of the different parameters, and to do so is an important advantage for this new class of diphasic nanoscale composite xerogel materials.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 24 (1987), S. 1841-1848 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: In this paper, the effects of selecting initial vectors on computation efficiency for a subspace iteration method are investigated. Four algorithms are used for selecting the initial vectors. First, arbitrary starting iteration vectors are chosen according to Bathe and Wilson's algorithm.1 In the other algorithms, the initial vectors are the retrieved eigenvectors from the Guyan and quadratic reduction methods. Improvement of the eigenvalue approximations of the subspace iteration method over reduction methods is presented. The computation effort is examined for the various algorithms used for initial iteration vectors.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
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