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  • 1
    Electronic Resource
    Electronic Resource
    Superconductivity at 91 K in the magnetic oxide holmium barium copper oxide, HoBa2Cu3O6+x (1987)
    s.l. : American Chemical Society
    Inorganic chemistry 26 (1987), S. 1645-1646 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00258a004
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Branchial osteochondroma in a gilthead sea bream, Sparus aurata L., cultured in the Gulf of Aqaba (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 8 (1985), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1985.tb00951.x
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal/chemical structures and magnetic properties of naturally occurring Mn1.7Fe1.3O4 (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4133-4135 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An unusually pure Mnx Fe3−x O4 sample (x(approximately-equal-to)1.3) from a regionally metamorphosed ore body is expected to exhibit an approach to thermodynamic equilibrium unattainable in synthetic materials. This expectation is confirmed by the observation of (1) a small tetragonal distortion and (2) a complete ordering of Fe on the B sublattice. 57Fe Mössbauer spectra, obtained at 298, 175, 125, and 92 K and in an external field of 30 kG at 92 K, exhibit magnetic hyperfine splitting requiring the fitting of two subspectra, I and II. At 298 K, Heff =418 kOe, α=0.36 mm s−1 , and ε≈0 for the more intense subspectrum I, whereas for II Heff =403 kOe, δ=0.34 mm s−1 , and ε(approximately-equal-to)−0.15 mm s−1 . The two subspectra are not split by a 30 kG external field. Subspectra I and II correspond to Fe3+ ions located on a single magnetic sublattice. Subspectrum II is assigned to Fe3+ ions in regions with locally, large tetragonal distortions as a consequence of Mn3+clustering, which has often been invoked to explain the crystal chemistry and physical properties of Mnx Fe3−x O4 .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340519
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  • 4
    Electronic Resource
    Electronic Resource
    The intrauterine device and ectopic pregnancy (1986)
    Springer
    Advances in contraception 2 (1986), S. 55-63 
    Details
    ISSN: 1573-7195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé A partir de données obtenues par contrôle de cas individuels et études de cohortes, on a évalué les rapports entre ĺemploi actuel et passé des stérilets, la durée d'emploi et le type des stérilets utilisés dans le but de cerner les risques de grossesse extra-utérine chez les utilisatrices de stérilets. Les résultats de ces études indiquent que le risque de grossesse extra-utérine ńaugmente pas chez les femmes ayant utilisé ou utilisant un stérilet. II ńa été découvert aucun rapport entre la durée d'emploi du stérilet-actuel ou passé-et les risques de grossesse extra-utérine. Les données regroupées en provenance d'études clinques portant sur divers types de stérilet ont révélé que le risque de grossesse extra-utérine était moindre chez les utilisatrices de stérilets contenant du cuivre, et était le plus élevé chez les femmes portant des stérilets à dégagement de progestérone. II faudra procéder à des recherches plus approfondies afin d'évaluer le degré de risque de grossesse extra-utérine chez les femmes ayant utilisé des stérilets dans le passé, d'autant plus que des études récentes ont révélé que ces femmes pourraient éventuellement courir un risque accru de stérilité.
    Abstract: Resumen Basado en datos proporcionados por estudios de casos-controlados y de cohortes se evaluaron las relaciones entre el uso presente y pasado de DIU, la duración de uso, y el tipo de DIU, a fin de determinar el riesgo de embarazo ectópico entre las portadoras de DIU. El resultado de esta revisión indica que las usantes pasadas y presentes de DIU no tienen un riesgo aumentado de embarazo ectópico. No se observó ninguna relación entre la duración de uso de DIU, el uso presente o pasado de DIU y el riesgo de embarazo ectópico. Datos agrupados de estudios clínicos de diferentes tipos de DIU mostraron que el más bajo riesgo de embarazo ectópico fue para los DIU con cobre y que el más alto riesgo para los DIU liberadores de progesterona. Más investigación es necesaria para evaluar los riesgos de embarazo ectópico en usuarias antiguas de DIU, especialmente, desde que estudios recientes han demostrado que estas mujeres podrían sufrir un más alto riesgo de infertilidad.
    Notes: Abstract Based on data given by case-control and cohort studies the relationships between current and past IUD use, duration of IUD use and the type of IUD were evaluated to determine the risk of ectopic pregnancy among IUD users. The results of this review indicate that current and past IUD users do not have an increased risk of ectopic pregnancy. No relationship was found between the duration of IUD use, for either current or past IUD users, and the risk of ectopic pregnancy. Pooled data from clinical studies of different types of IUD showed that the lowest risk of ectopic pregnancy was for users of copper-bearing IUDs, and the highest risk was for users of progesterone-releasing IUDs. Further research is needed to evaluate the ectopic pregnancy risks to past IUD users, especially in view of recent studies which have shown that these women may be at a higher risk of infertility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01849297
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  • 5
    Electronic Resource
    Electronic Resource
    Pelvic inflammatory disease and the IUD (1986)
    Springer
    Advances in contraception 2 (1986), S. 313-325 
    Details
    ISSN: 1573-7195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Resumé Les preuves qu'il existe un rapport entre l'utilisation des DIU et la salpiginte aiguë (SA) ont été examinées sur la base des résultats d'études cas témoins et cohortes. Ces deux types d'études épidémiologiques sont décrits brièvement. Elles ont été menées pour la plupart en hôpital et elles montrent que les utilisatrices de DIU courent plus de risques de contracter une SA que les femmes qui font appel à d'autres méthodes de contraception. Néanmoins, les résultats des études cas témoins et cohortes ne concordent pas. Considérées collectivement, les études cohortes indiquent des taux de SA analogues pour les utilisatrices de tous les types de DIU: il est semblable au taux de SA dans la population générale n'ayant subi ni avortement, ni accouchement, ni intervention chirurgicale.
    Abstract: Resumen Se revisa la evidencia de la asociación entre el uso de DIU y la enfermedad inflamatoria pelviana (PID) basada en los resultados de estudios de control de casos y estudios cohortes. Se describen brevemente ambos tipos de estudios epidemiológicos. La mayoría de los estudios de los casos controlados han ocurrido en hospitales y muestran que las usuarias de DIU tienen riesgo más alto de contraer una inflamación pelviana (PID) comparadas con mujeres que usan otros métodos anticonceptivos. Sin embargo, los resultados de estudios de control de casos y cohortes no están de acuerdo. Considerados en forma colectiva, los estudios cohorte muestran que las tasas de enfermedad inflamatoria pelviana (PID) son las mismas para usuarias de todos los tipos de DIU. Esta tasa essimilar a la tasa de enfermedad inflamatoria pelviana en la población general no asociada con aborto, parto o cirugía.
    Notes: Abstract The evidence for the association between IUD use and PID is reviewed based on the results of case-control and cohort studies. Both types of epidemiologic studies are described briefly. Most case-control studies are hospital-based and show that IUD users have a higher risk of having PID compared to women using other contraceptive methods. The results of case-control and cohort studies, however, are not in agreement. Considered collectively, cohort studies show that the PID rates are the same for users of all types of IUDs. This rate is similar to the PID rate in the general population not associated with abortion, childbirth or surgery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02340048
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  • 6
    Electronic Resource
    Electronic Resource
    Evolution of Sceloporus grammicus complex (Sauria: Iguanidae) in central Mexico II. Studies on rates of nondisjunction and the occurrence of spontaneous chromosomal mutations (1987)
    Springer
    Genetica 75 (1987), S. 131-144 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The iguanid lizard Sceloporus grammicus has a high level of karyotypic variability, and has often been cited as an example of chromosomal speciation. We examined a total of 2036 secondary spermatocytes from 30 S. grammicus males, and found that 16 of the 30 individuals (including a single lizard collected from a hybrid zone between two chromosome races) produced completely balanced spermatocytes. Fourteen of the 30 lizards (including both chromosomal heterozygotes and homozygotes) had relatively low (0.6% to 7.1%) levels of aneuploidy. Heterozygotes had a 1.1% increase over homozygotes in the number of aneuploid spermatocytes observed. The frequency of aneuploidy in S. grammicus may not be high enough to cause chromosomal speciation by any of the mechanisms that have been proposed for this complex. Most individuals showed balanced segregation of the autosomal trivalents, but nearly half of the lizards had a significant excess of spermatocytes with the X1 and X2 rather than the Y sex chromosomes. Five lizards had spermatocytes which had fission mutations not found in the somatic cells. As many as 5.9% of the spermatocytes in one individual had chromosomal mutations. This chromosomal mutation rate has important implications for chromosomal evolution in S. grammicus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00055257
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  • 7
    Electronic Resource
    Electronic Resource
    Identification and confirmation of arsenobetaine and arsenocholine in fish, lobster and shrimp by a combination of fast atom bombardment and tandem mass spectrometry (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 14 (1987), S. 723-732 
    Details
    ISSN: 0887-6134
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Using fast atom bombardment (FAB) ionization combined with tandem mass spectrometry (MS/MS), the identity of arsenobetaine (AB) in extracts of sole, haddock, lobster and shrimp was unequivocally confirmed. Evidence was also presented for the presence of arsenocholine (AC) in the shrimp extract. Confirmation was obtained by comparing the collision-induced dissociation (CID) daughter ion and parent ion spectra of major ions in the FAB spectra from these extracts with those from the authentic standards.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200141206
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