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  • 1
    Electronic Resource
    Electronic Resource
    Contact factor mediated fibrinolysis is increased by the combined oral contraceptive pill (1993)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 100 (1993), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective To study the fibrinolytic pathways and their relationship with the contact system in women using combined oral contraceptives (COCs).Design Serial plasma samples were collected from 18 women before treatment with COCs containing 30 μg oestrogen during treatment cycles 3 and 6, and 2 weeks after stopping treatment. Fibrinolysis was measured before and after dextran sulphate mediated contact activation using fibrin plates.Results Fibrinolysis increased significantly during cycles 3 and 6 (from 77% to 100% and 113%, respectively, P〈0.01) and showed a further increase after dextran sulphate activation (from 134% to 158% and 167%, respectively, P〈0.01). Tissue-plasminogen activator, urokinase-plasminogen activator and plasminogen activator inhibitor did not change significantly. There were significant elevations of Factor XII (from 0.92 μ/ml to 1.43 u/ml, P〈0.01) and prekallikrein (0.94 u/ml to 1.10 u/ml, P〈0.05) in cycle 3, which both remained high at cycle 6 (P〈0.01) and decreased after stopping the COC. Alpha-2-macroglobulin and C1-esterase inhibitor showed no significant change, but alpha-1-antitrypsin increased from 0.85 u/ml to 1.11 u/ml by cycle 3 (P〈0.01), and returned to near normal levels after stopping the COC.Conclusions The increase in fibrinolysis may be due to increased levels of Factor XII and prekallikrein without a corresponding increase in their natural inhibitors (C1-esterase inhibitor and alpha-2-macroglobulin). A parallel increase in the intrinsic pathway of coagulation may be limited by elevated alpha-1-antitrypsin at the level of activated Factor XI. The increase in fibrinolysis caused by oral contraceptives may balance any potential thrombotic risk due to increased fibrinogen or vitamin K dependent coagulation factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1993.tb12956.x
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  • 2
    Electronic Resource
    Electronic Resource
    Low-field magnetic hysteresis in gadolinium and terbium (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 471-475 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Fourier components of the ferromagnetic hysteresis of polycrystalline gadolinium and terbium have been measured in low ac magnetic fields (0.1–15 A m−1) using synchronous detection. The field dependences and magnitudes of the various harmonics cannot be described by the Rayleigh hysteresis law. It is shown that the dominant term in the absorptive component of the first harmonic is associated with a magnetic aftereffect. At the lowest fields (H(approximately-less-than)1 A m−1) there are indications that magnetic hysteresis vanishes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334775
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  • 3
    Electronic Resource
    Electronic Resource
    FORMULATION AND CHARACTERISTICS OF LOW-ESTER GELS FROM SUNFLOWER PECTIN (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 43 (1978), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Sunflower pectins extracted from a 1:1 mixture of heads and stalks contained 98.5% galacturonic acid of molecular weight 122,200 with ester and acetyl contents of 29.4 and 1.4%, respectively. Gel firmness and strength were evaluated over the ranges of pH 3.0–4.7,15–30 mg Ca++/g pectin, 0.75–1.25% pectin and 10–50% sucrose in the gel formulation. Conditions of pH 4.3, 22.5 mg Ca++/g pectin, 1% pectin and 30% sucrose were optimal for gel firmness and strength. The sunflower pectin gel was particularly sensitive to pH and calcium concentration which had marked influences on pectin solubility, pregelation, brittleness and granularity. A high proportion of free carboxyl groups (69.1%), and possibly nonrandom distribution of demethoxylated groups on the pectin molecules, appeared responsible for the high sensitivity of sunflower pectins to ionic conditions in the gel formulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1978.tb02408.x
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  • 4
    Electronic Resource
    Electronic Resource
    Helium temperatures in a four-circle neutron diffractometer (1977)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 10 (1977), S. 18-20 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The cooling of single-crystal samples to helium temperatures within a four-circle neutron diffractometer has been achieved by a novel continuous-flow system. The system relies solely on helium for its cooling power with two flow circuits being used. The first delivers liquid to a reservoir cryostat of capacity 1–4 l located close to the Eulerian cradle of the diffractometer and the second draws the refrigerant from this cryostat via a flexible transfer tube into the sample region of a compact cooling unit mounted off the cradle. This arrangement allows unhindered motion of the diffractometer circles for sample temperature operation in the range 3.9–300 K. The system requires a total helium flow of 1.0 l h−1 to maintain a temperature of 20±0.1 K, decreasing to 0.5 l h−1 at higher temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889877012710
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  • 5
    Electronic Resource
    Electronic Resource
    Algebraic computing and the Newman-Penrose formalism in general relativity (1977)
    Springer
    General relativity and gravitation 8 (1977), S. 987-1001 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The curvature tensor of space-time can be described most concisely by giving the components of the Weyl and Ricci tensors relative to a complex null tetrad. The Newman-Penrose equations provide a simple and direct algorithm for calculating these components. This paper describes a computer program, written in the symbolic manipulation language CAMAL, which performs this calculation. Comparisons are made with the classical tensorial method of calculation, and some applications are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00759742
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  • 6
    Electronic Resource
    Electronic Resource
    A TEM Investigation of the Symmetry of Nd3T-0.75pt29Si4B10 (T = Ni, Co) (1998)
    Springer
    Journal of materials science 17 (1998), S. 1791-1793 
    Details
    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
    URL: http://dx.doi.org/10.1023/A:1006653403091
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis and structural evolution of tungsten carbide prepared by ball milling (1997)
    Springer
    Journal of materials science 32 (1997), S. 1461-1467 
    Details
    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 Tungsten carbide has been synthesized directly by ball-milling tungsten powder and activated carbon in vacuum. The structural development of the WC phase with milling times up to 310 h has been followed using X-ray, neutron diffraction and scanning electron microscopy. Subsequent annealing (at 1000 °C for 1 and 20 h) of material milled for 90 h or longer, results in samples comprising almost entirely crystalline WC. The production of WC itself during milling results in enhanced iron contamination from the steel mill and balls on extended milling which were monitored by energy-dispersive X-ray and Mossbauer spectroscopies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018501916988
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  • 8
    Electronic Resource
    Electronic Resource
    Iron precipitation in Cu-Au-Fe alloys (1988)
    Springer
    Journal of materials science 23 (1988), S. 3480-3484 
    Details
    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 Interest is focused on the segregation and clustering behaviour of iron atoms in fcc Cu100−x−yAuxFey, alloys (x=6 to 50.7 at%, y=0.2 to 1.0 at%) of three different metallurgical states: as-rolled, fast-quenched and melt-spun. The gold concentration was varied to assess the effect of change in lattice parameter. Mössbauer spectroscopy has been used to examine iron clusters and phases in samples as functions of annealing temperature and time. The development of f c c γ-Fe, segregates with increasing annealing time at temperatures around 410° C has been monitored and the Néel temperature of the antiferromagnetic γ-Fe precipitates as well as their particle size determined, the latter by transmission electron microscopy. The increase in isomer shift with increasing gold concentration is accounted for mainly by changes in atomic volume.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540482
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  • 9
    Electronic Resource
    Electronic Resource
    Mixed hyperfine interactions and defect structure in magnesiowüstite Fe−Mg−O (1992)
    Springer
    Hyperfine interactions 68 (1992), S. 283-286 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An analysis of the 4.2 K spectra of FexO (x∼0.91) and (Fe0.4Mg0.6)xO is presented in which it is considered that because of the large electric field gradient at Fe2+ defect sites, the spectra cannot be described by Lorentzian sextets. It is assumed that the magnetic hyperfine field vector is oriented at random in the coordinate system defined by the EFG main axis, and that the EFG coordinate system is also distributed randomly. The simplifying assumption of the asymmetry parameter η=0 allows an analytical formula to be used to describe the complex spectra. Distributions of both magnetic hyperfine field and quadrupole interaction were progressively refined resulting in reasonable fits to the spectra with the main features being well reproduced. The magnetic hyperfine field distribution is rather broad with several features present while distinct values were obtained in the distribution of quadrupole interactions. These latter values are considered to correspond to the defect configurations around the Fe2+ sites. The distribution of hyperfine fields is considered to reflect the varying strengths of superexchange due to the high defect concentration as well as the effects of magnetic relaxation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396491
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  • 10
    Electronic Resource
    Electronic Resource
    Cluster phase transition in insulating spin glass Ga0.4Fe0.6NiAlO4 (1992)
    Springer
    Hyperfine interactions 68 (1992), S. 279-282 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer effect, a.c. susceptibility and magnetisation studies (4.2≦T≦350 K, −20≦H≦20 kOe) show that in the mixed spined ferrite Ga0.4Fe0.6NiAlO4, spin freezing occurs via cluster formation. As in some other insulating spin glasses, the spin glass phase diagram transitions occur not for individual spins but for clusters whose effective spins’ transverse and longitudinal components successively freeze. The presence of entropic spins and the centre shift of the field cooled hysteresis loop confirm the system’s frustrated nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396490
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