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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1130-1131 
    ISSN: 1420-9071
    Keywords: Nasal irritant receptors ; cigarette smoke ; blood pressure ; heart rate ; rabbits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Reflex autonomic changes which occur after cigarette smoke enters the upper airways are partially due to peripheral chemoreceptor stimulation. Chemoreceptor denervation attenuates but does not abolish smoke induced bradycardia. Denervation nearly abolishes bradycardia induced by tracheal occlusion. Hypertension accompanies smoke induced apnea but does not occur during tracheal occlusion.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We show that thermally stimulated luminescence is an important method for detecting insulating impurity phases that commonly occur in high Tc superconductors. The technique is sensitive to impurity phases at 〈1% level with a probe depth of ∼ 1 μm, which is the region of interest for many superconductor applications. Samples of Y2O3, Y2BaCuO5, YBa2Cu3O6.2, BaCO3, Ba3CuO4, BaCuO2, and YBa2Cu3Ox (x≈7) were investigated. All but the high quality sintered pellets of YBa2Cu3Ox exhibited relatively intense luminescence. The absence of luminescence, and thus of insulating phases, is correlated with low values of rf surface resistance.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 3712-3713 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The strength of the magnetostrictive material, Terfenol-D, Tb0.27Dy0.73Fe2.0, has been evaluated by measuring the modulus of rupture as a function of the Fe stoichiometry of the compound. It is shown that the strength improves markedly as the Fe concentration decreases from the stoichiometric value of 2.0 in the compound. The increased strength results from the increasing volume fraction of the rare-earth metal phase produced in the Terfenol-D matrix by the solidification process at lower Fe concentrations.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 5057-5060 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The high-temperature superconductor YBa2Cu3O7−x has been irradiated in a transmission electron microscope to investigate the effect of high doses of ionizing energy on the microstructure of this material. Electrons of energies low enough to avoid knock-on displacement damage (80 and 100 keV) were used to achieve radiation doses of 1×1012 Gy at 115 K and 2×1013 Gy at room temperature. Using the criteria of twin fading and formation of extended defects, no microstructural damage was observed. These results indicate that YBa2Cu3O7−x is extremely resistant to damage by radiolytic processes.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 651-653 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Intermixing of AlGaAs-based interfaces is known to be enhanced by capping wafers with a layer of SiO2. Assuming that this enhancement results from the introduction of additional Ga vacancies into the sample, it is possible to obtain the temperature-dependent equilibrium Ga vacancy diffusivity. Experiments are performed whereby SiO2-capped quantum well samples are annealed at temperatures ranging from 800 to 1025 °C. Calculated photoluminescence shifts are compared with the measured spectra, and a relation for the Ga vacancy diffusivity of the form 0.962 exp(−2.72/kBT) cm2/s is obtained. Using this relation, the equilibrium Ga vacancy concentration can be computed via an ensemble Monte Carlo simulation. The resulting expression is 1.25×1031 exp(−3.28/kBT) cm−3.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Advances in contraception 4 (1988), S. 265-270 
    ISSN: 1573-7195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Resumé On a examiné l'utilisation des DIU chez 962 femmes ayant interrompu une grossesse, à l'Hôpital de l'Université de Trondheim (Norvège) en 1983. Le diagnostic de grossesse ectopique était significativement plus fréquent chez les femmes qui portaient un dispositif au moment de la conception, par comparaison avec celles qui n'utilisaient pas cette méthode (7,8% contre 1,3%, soitp〈0,01). Malgré le retrait du DIU au cours du premier trimestre, les femmes qui devenaient enceintes alors qu'elles portaient encore le dispositif ont plus souvent eu un avortement spontané que celles qui n'en portaient pas (15,6% contre 7,0%, soitp〈0,05). L'explication de la cause de ces constatations appelle un examen plus poussé. Il est possible que le nombre réduit de grossesses ectopiques faisant suite à l'inefficacité d'un DIU utilisé comme contraceptif, comparé au nombre total des grossesses au cours de la même période, explique l'absence de rapport démontrable entre l'utilisation de plus en plus répandue des DIU et l'accroissement des pourcentages de grossesses ectopiques.
    Abstract: Resumen Se estudió el uso de DIU en 962 mujeres cuyos embarazos terminaron en el Hospital Universitario de Trondheim, Noruega, durante 1983. Con mayor frecuencia de diagnosticaron embarazos ectópicos entre las mujeres con un DIU durante la concepción que entre las no usuarias (7,8%vs 1,3%p〈0,01). A pesar de la remoción del DIU en el primer trimestre, las mujeres que se embarazaron con el DIU in situ tuvieron abortos espontáneos con mayor frecuencia que las no usuarias (15,6vs 7,0%p〈0,05). Estos hallazgos requiren mas investigación. El escaso numero de embarazos ectópicos a continuación de la falla contraceptiva de un DIU en relación con la cantidad de embarazos en el mismo tiempo, podría explicar la falta de una relación demonstrable entre el aumento de uso de los DIU y el aumento de tasas de embarazos ectópicos.
    Notes: Abstract Use of IUDs was examined among 962 women whose pregnancy was terminated at the University Hospital of Trondheim, Norway during 1983. Ectopic pregnancy was significantly more often diagnosed among women with an IUD in place at conception compared to non-users (7.8%vs 1.3%,p〈0.01). Despite removal of the IUD during the first trimester, women who became pregnant with an IUDin situ had spontaneous abortion more often than non-users (15.6%vs 7.0%,p〈0.05). The causal significance of these findings will require further investigation. The small number of ectopic pregnancies subsequent to an IUD contraceptive failure in relation to the number of all pregnancies within the same time frame may explain the lack of a demonstrable link between increasing IUD use and increasing rates of ectopic pregnancy.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-0428
    Keywords: Sucrose ; carbohydrate ; diabetic diet ; metabolic control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of regularly eating sucrose were studied in 23 diabetic patients, 12 Type 1 (insulin-dependent) and 11 Type 2 (non-insulin-dependent), with differing degrees of glycaemic control. Two diets, each lasting 6 weeks, were compared in a randomised cross-over study. Both diets were high in fibre and low in fat. In one diet 45 g of complex carbohydrate was replaced by 45 g of sucrose taken at mealtimes. There were no significant biochemical differences between the two diets in either Type 1 or Type 2 patients. In Type 1 patients the mean (±SEM) fasting plasma glucose was 10.5 (1.8) mmol/1 on the control diet and 10.3 (1.5) mmol/1 on sucrose. In Type 2 patients the levels were 9.1 (0.8) mmol/1 and 8.9 (0.8) mmol/l respectively. Glycosylated haemoglobin for the Type 1 patients was 9.9% on control and 10.3% on sucrose; for Type 2 patients the figures were 9.3% and 9.0% respectively. There were no differences in mean daily plasma glucose levels or diurnal glucose profiles. Cholesterol (total and in lipoprotein fractions) was unchanged, as were diurnal triglyceride profiles and plasma insulin profiles in the Type 2 patients. There were no changes in medication or body weight. We conclude that a moderate amount of sucrose taken daily at mealtimes does not cause deterioration in metabolic control in diabetic patients following a high fibre/low fat diet.
    Type of Medium: Electronic Resource
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