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  • 11
    Electronic Resource
    Electronic Resource
    Total synthesis and the absolute configuration of aurovertin B
    Amsterdam : Elsevier
    Tetrahedron Letters 27 (1986), S. 3643-3646 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(00)84870-4
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  • 12
    Electronic Resource
    Electronic Resource
    Spontaneous subcapital femoral neck fracture complicating a healed intertrochanteric fracture (1999)
    Springer
    Archives of orthopaedic and trauma surgery 119 (1999), S. 271-275 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A spontaneous subcapital femoral neck fracture is an uncommon complication of a healed intertrochanteric hip fracture. To determine the etiology of this complication, 274 patients who had been treated for intertrochanteric hip fractures were followed up over an 8-year period from June 1988 to June 1996. We found 7 fractures of the subcapital femoral neck without a history of a trauma. The remaining 267 patients were defined as the control group. All seven patients with fractures of the subcapital femoral neck were women, and their average age at the time of compression hip screw (CHS) fixation was 83 years (range 74–92 years). The subcapital fractures occurred between 4 and 36 months after CHS fixation. The difference in the Singh index between the patient and control groups was statistically significant (P 〈 0.01). However, with regard to the position of the screw, spinal score, age, ambulatory ability, height, weight, and intertrochanteric fracture type (Jensen type), the differences between the patient and control groups were not statistically significant. Based on our findings, we conclude that a high grade of osteoporosis is the most important predisposing factor in the spontaneous development of a subcapital femoral neck fracture after a healed intertrochanteric hip fracture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050408
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  • 13
    Electronic Resource
    Electronic Resource
    Rotational acetabular osteotomy for the treatment of dysplastic hips with end-stage osteoarthrosis – a biological alternative to total hip arthroplasty? (1999)
    Springer
    Archives of orthopaedic and trauma surgery 119 (1999), S. 376-379 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We evaluated the results of rotational acetabular osteotomy (RAO) for the treatment of dysplastic hips with end-stage osteoarthrosis. Sixteen patients, aged 15–¶45 years at the time of surgery, were reviewed at a mean follow-up of 8 years (range 3–17 years). Remodeling of the hip joint occurred in half of the patients, with significant clinical improvement. A subsequent total hip arthroplasty, however, was done within 2 years after RAO in two other patients who had had large bone cysts in the femoral head and acetabulum. We suggest that RAO may be the procedure of choice for selected young patients, especially teenage patients, to postpone total hip arthroplasty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050432
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  • 14
    Electronic Resource
    Electronic Resource
    Transmission of a t(13q22q) chromosome observed in three generations with segregation of the translocation D1-trisomy syndrome (1975)
    Springer
    Human genetics 〈Berlin〉 30 (1975), S. 207-215 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A case of an inherited type of D/G translocation D1-trisomy syndrome was described. A female proposita who had the clinical signs of D1-trisomy syndrome was found to have a chromosome complement of 46,XX,-G,+t(DqGq). Examination of Q- and G-stained karyotypes revealed that the chromosomes involved in the translocation were members of Nos. 13 and 22, or t(13q22q) with breaks at p12 of both chromosomes. C-stained figures also showed a large heterochromatin block in its centromeric region. The t(13q22q) chromosome was transmitted from the paternal grandmother of the proposita through at least three generations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279186
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  • 15
    Electronic Resource
    Electronic Resource
    Adhesion of chromium metallization on alumina surfaces prepared by sol-gel techniques (1991)
    Springer
    Journal of materials science 26 (1991), S. 1815-1820 
    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 The adhesion of a sputter-deposited Cr metallization layer to alumina films prepared by a solution-gelation method has been investigated using a pull test. Alumina films with a range of thicknesses (1 to 6 Μm) were prepared by dipping commercially available polycrystalline alumina substrates into hydrolysed aluminium butoxide sols and fired for 1 h at 500, 900, or 1200
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543608
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  • 16
    Electronic Resource
    Electronic Resource
    Colonna capsular arthroplasty: a 33-year follow-up of four patients (1999)
    Springer
    International orthopaedics 23 (1999), S. 145-147 
    Details
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé  Nous avons évalué les résultats de l’arthroplastie capsulaire selon Colonna dans le cas de 4 malades atteint de luxation congénitale de la hanche unilatérale. Toutes étaient de sexe féminin, agées de 10 à 14 ans à l’intervention chirurgicale et de 42 à 50 ans au délai d’observation. Le résultat le plus remarquable dans cette étude réside dans la bonne qualité de la marche. Bien que la radiologie montre la présence d’une forte dégénération coxale, les malades ne souffrent que de douleurs légères ou modérées de la hanche.
    Notes: Abstract  We evaluated the results of Colonna capsular arthroplasty in 4 patients with unilateral congenital dislocation of the hip. All of these patients were female, aged 10–14 years at the time of surgery, and 42–50 years at the time of follow-up. The most striking finding in this study was the good ability to walk. Although radiographs showed considerable joint degeneration, all of these patients had only mild to moderate pain in the hip.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002640050332
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  • 17
    Electronic Resource
    Electronic Resource
    Effects of nerve growth factor on cultured adult dorsal root ganglion neurons evaluated by enzyme immunoassay for neurofilament protein (1990)
    Springer
    Age 13 (1990), S. 57-60 
    Details
    ISSN: 1574-4647
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We examined the effects of nerve growth factor (NGF) on cultured dorsal root ganglion (DRG) neurons obtained from 10-, 72-and 114-week-old mice by using a newly developed enzyme immunoassay (EIA) for neurofilament protein. Neurofilament protein levels estimated with EIA were demonstrated to depend on neurite length as well as on the neuronal number. Neurofilament protein levels increased with increasing NGF added, while surviving neuronal numbers were not affected by NGF. This indicates that NGF accelerated neurite elongation, but was not required for survival of adult DRG neurons. We also revealed that neurite-extending capacity dependent on NGF was reduced with aging, but a large amount of NGF significantly stimulated neurite extension even in 114-week old mice. Accordingly, diminished neurite regeneration after damage to neural tissue of aged animals may be related in part to a reduction of growth-inducing substances such as NGF possibly secreted by target cells as well as a reduction in the ability of neurons to synthesize or to assemble materials necessary for repair.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02432390
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  • 18
    Electronic Resource
    Electronic Resource
    Fragile networks and rheology of concentrated suspensions (1992)
    Springer
    Rheologica acta 31 (1992), S. 333-344 
    Details
    ISSN: 1435-1528
    Keywords: Iron oxide ; flocculated suspension ; linear viscoelasticity ; percolation ; cryo-scanning electron microscopy ; concentrated colloidal suspension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Suspensions consisting of particles of colloidal dimensions have been reported to form connected structures. When attractive forces act between particles in suspension they may flocculate and, depending on particle concentration, shear history and other parameters, flocs may build-up in a three-dimensional network which spans the suspension sample. In this paper a floc network model is introduced to interpret the elastic behavior of flocculated suspensions at small deformations. Elastic percolation concepts are used to explain the variation of the elastic modulus with concentration. Data taken from the suspension rheology literature, and new results with suspensions of magnetic γ-Fe2O3 and non-magnetic α-Fe2O3 particles in mineral oil are interpreted with the model proposed. Non-zero elastic modulus appeared at threshold particle concentrations of about 0.7 vol.% and 0.4 vol.% of the magnetic and non-magnetic suspensions, respectively. The difference is attributed to the denser flocs formed by magnetic suspensions. The volume fraction of particles in the flocs was estimated from the threshold particle concentration by transforming this concentration into a critical volume concentration of flocs, and identifying this critical concentration with the theoretical percolation threshold of three-dimensional networks of different coordination numbers. The results obtained indicate that the flocs are low-density structures, in agreement with cryo-scanning electron micrographs. Above the critical concentration the dynamic elastic modulus G′ was found to follow a scaling law of the type G′ ∼ (Φ f -Φ f c ) f , where Φ f is the volume fraction of flocs in suspension, and Φ f c is its threshold value. For magnetic suspensions the exponent f was found to rise from a low value of about 1.0 to a value of 2.26 as particle concentration was increased. For the non-magnetic a similar change in f was observed; f changed from 0.95 to 3.6. Two other flocculated suspension systems taken from the literature showed a similar change in exponent. This suggests the possibility of a change in the mechanism of stress transport in the suspension as concentration increases, i.e., from a floc-floc bond-bending force mechanism to a rigidity percolation mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00418330
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  • 19
    Electronic Resource
    Electronic Resource
    Strain-thickening transition in ferric-oxide suspensions under oscillatory shear (1993)
    Springer
    Rheologica acta 32 (1993), S. 539-549 
    Details
    ISSN: 1435-1528
    Keywords: Ferric-oxide suspension ; shear thickening ; floc model ; memory effect ; percolation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Shear-strain-thickening transition under oscillatory flow was observed in flocculated ferric-oxide suspensions in mineral oil. The value of the dynamic modulus of the suspensions that was measured at small strain amplitude after cessation of shear also became higher when the strain amplitude of the applied shear had been within or above the transition region. The ferric-oxide powders used were an acicular submicron maghemite (magnetic) and the hematite (non-magnetic) that was converted from the maghemite by heat treatment. The powders were treated with a dispersing agent and the suspensions were prepared in 33% by particle weight. The strain-thickening transition was observed in both the magnetic and the non-magnetic suspensions. However, the onset of the strain-thickening in the magnetic suspension was found at about one decade larger strain amplitude than that in the non-magnetic analog suspension, indicating particle interactions affect to the appearance of the phenomenon. A qualitative interpretation was made in view of site percolation for the enhancement of modulus at rest after the application of the large-amplitude oscillatory shear, where the process of the strain-thickening transition under shear and the development of the modulus after stopping the shear was described with a floc model in which the flocculation phase dilates as a result of the reduction of the particle linkages under higher shear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369070
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  • 20
    Electronic Resource
    Electronic Resource
    Synthetic fluorotetrasilisic mica as a support for stereoselective catalysts (1993)
    Springer
    Journal of materials science 28 (1993), S. 4163-4166 
    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 Synthetic fluorotetrasilisic mica (TSM) is a layered compound which has exchangeable cations between layers. Cupric cations were intercalated into TSM. X-ray diffraction study indicated that layered structures remained after calcination, but the interlayer spacings decreased. The hydrogenation of dienes with copper-exchanged TSM were investigated as heterogeneous catalysts. Ar+ ion-beam bombardment on the copper-exchanged TSM proved that copper was intercalated into the interlayer space. The turnover frequency (TOF) of 1,3-butadiene hydrogenation over Cu/TSM was 0.57 times lower than that over Cu/Al2O3 which has no structural obstacles around the active site, while the TOF of 2,3-dimethyl-1,3-butadiene hydrogenation as a bulky molecule over Cu/TSM was 0.03 times lower than that over Cu/Al2O3. TSM possesses an advantage over conventional supports in that bulky substrates have hardly any access to catalytically active sites in the interlayer space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351248
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