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  • 1
    Electronic Resource
    Electronic Resource
    Proton NMR study of effects of synergistic anion and metal ion binding on pH titration of the histidinyl side-chain residues of the half-molecules of ovotransferrin (1987)
    s.l. : American Chemical Society
    Biochemistry 26 (1987), S. 3115-3120 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00385a025
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  • 2
    Electronic Resource
    Electronic Resource
    Gas Liquid Chromatography of Some Naturally Occurring Coumarins. (1962)
    s.l. : American Chemical Society
    Analytical chemistry 34 (1962), S. 1058-1061 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60189a007
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  • 3
    Electronic Resource
    Electronic Resource
    Lignins (1966)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Plant Physiology 17 (1966), S. 223-244 
    Details
    ISSN: 0066-4294
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pp.17.060166.001255
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  • 4
    Electronic Resource
    Electronic Resource
    A new design for a UHV compatible Czochralski crystal growth system (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2427-2429 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe the design of a new system for the Czochralski growth of single crystals of intermetallic materials under ultrahigh vacuum conditions. Particular attention has been paid to an arrangement for very uniform movement of the pulling mechanism. We report the growth of large high-quality single crystals of MnSi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141333
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  • 5
    Electronic Resource
    Electronic Resource
    Reactive-ion-etched gallium nitride: Metastable defects and yellow luminescence (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3285-3287 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Gallium nitride has been reactive-ion etched with SF6 and argon plasmas. The Ar-etched samples show a striking transition from a dominant blue luminescence band to a dominant yellow luminescence band after less than 5 min of low power illumination. The observation of metastable defects which are associated with both the yellow and blue bands has important consequences for our understanding of defect-related luminescence in gallium nitride. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125326
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  • 6
    Electronic Resource
    Electronic Resource
    An evaluation of the use of infrared heating for contouring 30% short carbon-fibre-reinforced PEEK (1992)
    Springer
    Journal of materials science 3 (1992), S. 88-94 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The ability to contour reinforced composites at specific points would allow these low modulus, high strength materials to be utilized in a wide variety of new applications. Contourable materials of this type would be especially suitable for orthopaedic applications such as internal fixation of fractures where plate removal due to stress shielding and bone resorption are major concerns. To this end, the high-temperature contourability of 30% short carbon-fibre-reinforced PEEK was investigated. The use of infrared radiation to heat this material to temperatures suitable for contouring was developed and refined into a protocol for heating and bending 12.4×6.4 mm injection-moulded flexural testing bars. To evaluate the heating, contouring and cooling effects of this processing on the material's mechanical and physical properties, five specimen groups were tested: control, extended heat only, cyclical heat only, repeated contouring, and repeated contouring-quenched. Each group's flexural properties, fracture toughness, post-contouring matrix crystallinity and extent of fibre-matrix wetout were monitored. The two heat only groups showed no significant changes in any properties compared to control. For the contoured groups, the quenched subgroup showed a minimal 0–9% decrease in all categories. The non-quenched group showed only a 0–6% change. The resilience of short carbon-fibre-reinforced, PEEK after severe thermo-mechanical cycling is convincing evidence of this material's suitability for structural applications, especially in which contourability and fast processing are required. This study demonstrates the thermoductility of CFR PEEK.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00705274
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  • 7
    Electronic Resource
    Electronic Resource
    Elevated temperature deformation of several quaternary L12Al3Ti based alloys reinforced with TiB2 particles (1995)
    Springer
    Journal of materials science 30 (1995), S. 6309-6315 
    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 Concurrent with an investigation of quaternary cast and forged L12 modified Al3Ti's containing 9 at% Cr, Fe and/or Mn, a similar series of four alloys was produced via XDTM technology, whereby 20 vol% of ∼ 0.5 μm TiB2 particles was incorporated as a reinforcement. Following densification by hot pressing and slow isothermal forging, small diameter compression test samples were machined from each compact and tested. The 0.2% yield strength measurements revealed a strength advantage for the particulate reinforced materials over the unreinforced ingot metallurgy matrices to about 1175 K. Furthermore, 900 and 1100 K constant velocity testing indicated that the TiB2 containing materials were stronger than the ingot metallurgy matrices down to strain rates of ∼ 10−7s−1. None of the quaternary L12 alloys + 20 TiB2 consistently displayed a strength advantage over others. However, extrapolation of the present mechanical property data into slower strain regimes indicated that the composites will not possess any strength advantage overthe unreinforced versions. Such losses in strength appeared to be caused by small grains in the particulate reinforced alloys, which promoted grain boundary weakening mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369682
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  • 8
    Electronic Resource
    Electronic Resource
    Incidence of infection and analysis of contributing factors in revision joint arthroplasty over a two-year period (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 5 (1994), S. 103-108 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: This study examined the incidence of infection and the contributing factors in 166 patients undergoing total joint revision surgery. Of these 32 (19%) had organisms grown from material taken at the local site at the time of revision surgery. Six of the culture-negative patients were clinically suspected of having an infection. With the inclusion of these six, the total incidence of infection in these revision patients was 23%. This is not the incidence of infection in total joint surgery. This is the incidence of infection in patients undergoing revision surgery for whatever reason. The cause of infection in 53% of the cases was either Staphylococcus aureus or coagulase-negative Staphylococci. The Gram-negative bacteria were implicated in only five (15%) of the cases. Many of these infections (31%) were in patients who had had the implant for greater than 7 years. Only 15% of the infections were in patients who had the implant for less than 6 months with an additional 9% being revised in the first year. There were no clinical symptoms or underlying conditions, including allergy, that distinguished the infected from the noninfected group. The infection rate was somewhat higher with the cobalt chromium alloys, somewhat less in the uncemented devices, and somewhat higher in the patients with total knee replacements than those with total hip replacements. The histopathologic analysis revealed that the presence of polymorphonuclear leukocytes (PMNS) was correlated with infection, but most patients with infection had lymphocytes rather than PMNS indicative of a chronic infection. Thus the diagnosis of infection on the basis of histopathology needs to be carefully evaluated. The presence of PMNS is diagnostic for infection, but has a high number of false negatives. The histopathologic data and the data on implantation time indicate that most of these infections are chronic infections. © 1994 John Wiley & Sons, Inc.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770050202
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  • 9
    Electronic Resource
    Electronic Resource
    Fretting corrosion accelerates crevice corrosion of modular hip tapers (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 6 (1995), S. 19-26 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The use of multiple-component systems in orthopedic surgery gives the surgeon increased flexibility in choosing the optimal implant, but introduces the possibility of interfacial corrosion. Such corrosion could limit the longevity of prostheses due either to tissue reactions to corrosion products, or to device failure. The incidence and nature of corrosion of modular total hips was evaluated in a consecutive series of 79 retrieved implants from University Hospitals of Cleveland. Surfaces were examined with stereo- and scanning electron microscopy. Several laboratory studies were undertaken to examine mechanisms that might contribute to the initiation of corrosion. The first set of experiments investigated the effect of head neck extension; the second study looked at the effect of material combinations on fretting corrosion and crevice corrosion. Analysis of retrieved implants demonstrated that fretting corrosion played a major role in the initiation of interface corrosion, and that a correlation existed between corrosion and length of neck extensions. Laboratory studies showed that longer head neck extensions may be more susceptible to fretting corrosion because of an instability at the interface. Short-term mixedmetal corrosion studies demonstrated that the coupling of cobalt and titanium alloys did not render the interface more susceptible to corrosion. It is hypothesized that fretting corrosion contributes to the initiation of modular interface corrosion, and that the problem can be reduced by design changes that increase the stability of the interface. © 1995 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770060104
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  • 10
    Electronic Resource
    Electronic Resource
    Bone ingrowth into dynamically loaded porous-coated intramedullary nails (1976)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 10 (1976), S. 485-492 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Research to determine whether porous-coated Vitallium intramedullary rods could be used to bridge segmental defects in long bones was performed using rabbit tibias as a suitable model for human bone growth. One-centimeter segments of the midshaft of tibias of mature rabbits were removed surgically and replaced with equal-sized segments of Silastic tubing to maintain leg length. A coated rod was inserted through the proximal tibial segment, through the tubing, and into the distal bone segment. The legs were taken out of plaster at 3 weeks, and x-rays were taken periodically until sacrifice.At sacrifice, 30 weeks postoperatively, the mechanical properties of both tibias from each rabbit were measured destructively in a torsional testing machine. The load at failure of the tibia with the segmental defect averaged 90% of the contralateral control tibia. Rod pullout data and electron-probe x-ray microanalysis indicated that a substantial rod-endosteal bone bond existed due to ingrowth into the porous coating. The torsional data may have been somewhat obscured by the presence of a bony callus which grew over the Silastic tubing and bridged the segmental defect exosteally in every case.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820100403
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