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  • Articles: DFG German National Licenses  (64)
  • 1990-1994  (64)
  • 1
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The conversion efficiency into kilovolt line radiation for 248-nm light at 1017 W/cm2 on an aluminum target is measured. The x-ray yield is found to increase with the scale length of the target plasma. The interaction is modeled as resonance absorption, and the plasma scale length is determined from the prelase energy and irradiance.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5593-5595 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By means of inelastic magnetic neutron scattering, we have determined the molecular field acting on the Gd3+ ions in Gd2Fe14B. This field is due to the Gd-Fe exchange interaction and amounts to 2μBHm/kB = 435 K for the average value of f and g sites. From the width of the magnetic response, a maximal ratio of 1.3 for the molecular fields on f and g sites is deduced.
    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 69 (1991), S. 6219-6221 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dispersion relation of the spin-wave excitations in bcc iron has been studied by neutron inelastic scattering at the spallation neutron source ISIS. Magnetic intensity was followed up to 550 meV along the [100] direction. The general form of the dispersion curve is in qualitative agreement with that calculated from a spin-polarized band model, and in particular the prediction of propagating modes extending above 300 meV has been confirmed.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ultrafast time-resolved absorption spectroscopy in the hard ultraviolet has been used to investigate the photodissociation of gas-phase CF2Br2 photolyzed at 248 nm. The broadband spectra obtained in the 250–265 nm region have shown that absorption of a single photon activates a two-step sequential elimination of the molecule's two bromine atoms, leaving the product CF2 radical in the ground or first-excited vibrational state of its ν2 bending mode. The spectra also demonstrate the direct detection of the vibrationally hot CF2Br intermediate species itself. We interpret the ∼6 ps time scale over which the diffuse CF2Br spectrum evolves as evidence for slow intramolecular vibrational redistribution within this molecule.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An x-ray streak camera is used to diagnose a laser-produced Al plasma with time resolution of ∼10 ps. A streak record of filtered emission and a time-integrated transmission grating spectrum reveal that the plasma radiation is dominated by emission from He- and H-like resonance lines.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objectives To determine whether the change in erythrocyte potassium content in normal human pregnancy is accompanied by a similar change in erythrocyte chloride content. To assess erythrocyte hydration and potassium and chloride content in pregnancies complicated by proteinuric pregnancy induced hypertension.Design A serial study during and after normal pregnancy. A comparative study during and after pregnancies complicated by proteinuric pregnancy induced hypertension (PIH). Erythrocyte hydration, total osmoles, potassium and chloride and plasma osmolality were determined.Setting University teaching hospital, UK.Subjects Twenty-eight women studied at 14, 28 and 36 weeks of normal pregnancy and ten women with PIH studied during the third trimester of pregnancy. All women were reinvestigated 20 weeks after delivery.Results The fall of erythrocyte potassium early in normal pregnancy (277.4 vs 265.2 mmol/kg; P〈0.02) and its rise between 28 and 36 weeks (272.3 vs 288.0 mmol/kg; P〈0.005) were accompanied by similar changes in erythrocyte chloride content (151.9 vs 131.1 mmol/kg; P〈0.001 and 129.4 vs 141.3 mmol/kg; P〈0.001, respectively). Plasma osmolality in PIH was raised above that normal in pregnancy (287.2 vs 283.0 mosm/kg; P〈0.005). In PIH, compared to normal pregnancy, erythrocyte hydration (2.00 vs 1.89 l/kg dry weight cells), total osmoles (573.0 vs 534.2 mosm/kg), potassium (303.0 vs 288.0 mmol/kg) and chloride (154.9 vs 141.3 mmol/kg) were greater.Conclusions These findings further support the hypothesis that changes in plasma osmolality in pregnancy are secondary to alterations in cell osmoles and serve to limit changes in cell hydration. Erythrocyte composition and plasma osmolality are altered in PIH.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 100 (1993), S. 0 
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. In a double blind trial, 60 nulliparae with a modified Bishop score of 〈inlineGraphic alt="leqslant R: less-than-or-eq, slant" extraInfo="nonStandardEntity" href="urn:x-wiley:14700328:BJO827:les" location="les.gif"/〉5 requiring induction of labour, received either 8 mg of salbutamol or an identical placebo orally, 30 min before vaginal administration of 2 mg prostaglandin E2 gel. Women in the salbutamol group experienced less uterine activity over the subsequent 12 h compared with those given placebo, and fewer (35%) commenced labour compared with the placebo group (62%). However, the change in cervical score was significantly less in the salbutamol group (mean 3.0, SD 3.1) than that in the placebo group (mean 5.8, SD 3.2), and the prostaglandin treatment to delivery time in the salbutamol group (mean 26.1 h, SD 6.49) was significantly longer than that in the placebo group (mean 19.3 h, SD 7.95). The first stage of labour lasted 〉10h in 11 women in the salbutamol group compared with five in the placebo group. Side effects attributable to salbutamol occurred in 10% 〉 of the treated women but in none of their fetuses and fetal outcome was satisfactory and similar in both groups. Our findings show that salbutamol can suppress prostaglandin-induced uterine activity during cervical ripening, which could be an advantage in induction of labour where a planned delivery is preferred. However, the poorer outcome of labour in salbutamol-treated women mitigates against this approach.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of cosmetic science 15 (1993), S. 0 
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The effects of aqueous solutions of 2-hydroxyalkanoic acids and analogous materials on the extensibility of an in vitro model for human stratum corneum have been investigated. The increase in extensibility of stratum corneum caused by treatment with 2-hydroxy acid solutions reaches a peak at C8 in the case of the saturated molecules. Introducing unsaturation into the hydrocarbon chain shifts the point of maximum efficacy to a longer chain length. Further modifications to the molecular backbone, such as the replacement of a methylene group by heteroatoms, can improve significantly the relative plasticization obtained from aqueous treatment. Alteration of the acidic head group markedly influences the elasticity increase. The free acid is the most efficacious species. An increase in the pKa of HCA by the addition of polyol increases the extensibility improvement. Movement of the hydroxyl group from C-2 is not advantageous, but replacement with a 2-thio derivative is beneficial in terms of increased plasticization. The best systems for improving extensibility have a strong affinity for protein.〈section xml:id="abs1-2"〉〈title type="main"〉RésuméNous avons analysé les effets de solutions aqueuses d'acides 2-hydroxyalkanoïques et de matériaux similaires sur l'extensibilité in vitro d'un échantillon de stratum corneum humain. L'augmentation de l'extensibilité du stratum corneum générée par le traitement aux solutions des acides 2-hydroxy atteint un pic à C8 dans le cas de molécules saturées. L'introduction d'une insaturation au niveau de la chaîne d'hydrocarbone amène le point d'efficacité maximum à une chaîne plus longue. Des modifications apportées aux molécules principales, telles que le remplacement du groupe méthylène par des hétéroatomes peuvent améliorer de façon significative la plasticité relative obtenue par un traitement aqueux. L'altération du groupe acide de tête influence de façon notable l'augmentation de l'élasticité. L'acide libre est la plus efficace. Une augmentation du pKa de l'acide 2-hydroxy caprylique par addition de polyol accroît l'amélioration de l'extensibilité. Le deplacement du groupe hydroxy de C-2 n'est pas efficace mais le remplacement par des dérivés 2-thio améliore la plasticité. Les systémes qui améliorent au maximum l'extensibilité ont une affinité importante avec les protéines.
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  • 10
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 200-202 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated visible photoluminescence (PL) from thin porous Si1−xGex alloy layers prepared by stain etching of molecular-beam-epitaxy-grown material. Seven samples with nominal Ge fraction x varying from 0.04 to 0.41 were studied at room temperature and 80 K. Samples of bulk stain etched Si and Ge were also investigated. The composition of the porous material was determined using x-ray photoemission spectroscopy and Rutherford backscattering techniques to be considerably more Ge rich than the starting epitaxial layers. While the luminescence intensity drops significantly with the increasing Ge fraction, we observe no significant variation in the PL wavelength at room temperature. This is clearly in contradiction to the popular model based on quantum confinement in crystalline silicon which predicts that the PL energy should follow the band-gap variation of the starting material. However, our data are consistent with small active units containing only a few Si atoms that are responsible for the light emission. Such units are present in many compounds proposed in the literature as the cause of the visible PL in porous Si.
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