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  • 1
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: We demonstrated a nonvolatile memory fabricated with the sandwich device structure ofAl/Au nano-crystals embedded in the PVK/Al. The bi-stable conduction switching characteristic(Ion/Ioff ratio) was 〉1x102, depending on Au nano-crystal size. The size and distribution of Aunano-crystals were determined by the inserted Au-layer thickness between PVK layers. The size ofAu nano-crystals increased with the inserted Au-layer thickness. The uniform distribution of isolatedAu nano-crystals was obtained with 5 nm of the inserted Au-layer thickness
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 1195-1198 
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Transformation of uniformly strained GexSi1-x layers into GeSi dots of 3 ~ 7 nm which arecompositionally ordered by one or concurrently two sets of {111} planes was carried out for the firsttime under non-equilibrium conditions induced by 1.25 MeV electron irradiation at Tc ≥ 200 oC inthe high voltage electron microscope (JEM-ARM1300S). This microscope installed in the KBSI ischaracterized by an excellent point-to-point resolution of 0.12 nm allowing obtaining detailedinformation on chemical ordering at specific parameters of defocus (-800 Å) and crystal thickness(200~250 Å) determined by extensive HRTEM image simulation for the ordered dots
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1243-1246 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Medial placement of a cementless acetabular component into or beyond the medial wall ofa shallow, dysplastic acetabulum is a technique to enhance its coverage during difficult total hiparthroplasty (THA). Dysplastic hips almost always need small size of acetabular component, so anaccelerated polyethylene wear can occur when a conventional bearing surface is used. Modernalumina-on-alumina couplings can be an alternative for these patients. We evaluated the clinicalresults of 43 medially placed cementless acetabular components (PLASMACUP®SC) incorporating amodern alumina bearing surface (BIOLOX® forte). Acetabular components were inserted mediallybeyond the ilioischial line and, therefore, beyond the level of the cortical bone of the cotyloid notch,and followed up for more than 5 years (range, 60 – 93 months). In 14 hips, the medial acetabular wallwas perforated purposefully and the medial aspect of the cup was placed beyond both the ilioischialand the iliopubic line on radiographs. The mean Harris hip score improved from 55.3 pointspreoperatively to 94.5 points postoperatively. Postoperatively, the hip center migrated 12.1 mmmedially and 1.5 mm inferiorly. The average amount of cup protrusion beyond the ilioischial and theiliopubic line was 3.1 mm and 1.9 mm, respectively. The average superolateral coverage of the cupwas 98.5 percent. During follow-up, no osteolysis or loosening of acetabular components wasobserved and no revision was required. Medial placement of a cementless acetabular component intoor beyond the medial acetabular wall offers predictable clinical results and durable fixation in modernalumina-on-alumina THA
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1247-1250 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Total hip arthroplasty (THA) in patients with sequelae of the hip joint infection is atechnically challenging procedure. In addition, the majority of such patients are less than fifty yearsold, so it has been reported that they have higher prevalence of complication and failure ofcomponent fixation. Alumina-on-alumina couplings are an attractive alternative and may offer apromising option for such young active patients. We analyzed 33 primary cementless alumina-onaluminaTHAs (PLASMACUP®SC-BiCONTACT® system incorporating BIOLOX® forte) that hadbeen performed in patients who had sequelae of the hip joint infection. The average age of thepatients was 37.8 years (range, 19-68 years) and 26 patients were younger than 50 years old. Theywere followed-up for more than 5 years (average, 74 months; range, 60-93 months). All hips had norecurrence of hip joint infection. The mean Harris hip score improved from 59.8 points to 93.5points. All of the implants had radiographic evidence of a bone ingrowth and no radiologicalloosening was found. During the follow-up period, no cup or stem was revised and no periprostheticosteolysis was observed. Nonunion of the osteotomized greater trochanter occurred in one hip, butno postoperative infection or ceramic failure was observed. The 5-year minimum follow-up clinicalresults of modern alumina-on-alumina THAs performed in patients with sequelae of the hip jointinfection were encouraging with regard to osteolysis and implant stability. Our findings show thatthis alternative articulation offers a reliable solution for these young patients with long-standinganatomic abnormalities of the bone and soft tissues
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 780-785 
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Effects of acicular ferrite and retained austenite on the mechanical properties ofbainite-base steels were investigated. Various morphology and volume fraction of constituent phaseshave been obtained by control of hot rolling conditions and alloy compositions. It has been shown thatthe steels containing retained austenite have better combinations of strength and ductility than theones with no retained austenite. However, there is no noticeable change in DBTT by the incorporationof retained austenite in the microstructure since retained austenite exists as fine particles. On the otherhand, DBTT of the steels are largely affected by the presence of acicular ferrite in the microstructure.EBSD analyses of fractured Charpy specimens show that cracks are deflected within themorphological packet of acicular ferrite, indicating its role in reducing the effective grain size of thesteels
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Alkylbenzene-degrading Rhodococcus sp. strain DK17 is able to utilize phthalate and terephthalate as growth substrates. The genes encoding the transformation of phthalate and terephthalate to protocatechuate are organized as two separate operons, located 6.7 kb away from each other. Interestingly, both the phthalate and terephthalate operons are induced in response to terephthalate while expression of the terephthalate genes is undetectable in phthalate-grown cells. In addition to two known plasmids (380-kb pDK1 and 330-kb pDK2), a third megaplasmid (750-kb pDK3) was newly identified in DK17. The phthalate and terephthalate operons are duplicated and are present on both pDK2 and pDK3. RT-PCR experiments, coupled with sequence analysis, suggest that phthalate and terephthalate degradation in DK17 proceeds through oxygenation at carbons 3 and 4 and at carbons 1 and 2 to form 3,4-dihydro-3,4-dihydroxyphthalate and 1,2-dihydro-1,2-dihydroxyterephthalate, respectively. The 3,4-dihydroxyphthalate pathway was further corroborated through colorometric tests. Apparently, the two dihydrodiol metabolites are subsequently dehydrogenated and decarboxylated to form protocatechuate, which is further degraded by a protocatechuate 3,4-dioxygenase as confirmed by a ring-cleavage enzyme assay.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A novel catalase-peroxidase (CP) from methanol-grown cells of Mycobacterium sp. strain JC1 was purified. The CP exhibited properties of both typical mycobacterial CPs (i.e. strict pH optimum, labile to heat treatment, capable of oxidizing NADH, and resistant to inhibition by 3-amino-1,2,4-triazole) and true catalases (i.e. stable against ethanol–chloroform treatment). The enzyme oxidized methanol and shared common antigenic groups with other mycobacteria. Isoniazid had almost no effect on the growth and expression of CP but inhibited the enzyme activity to some extent. Sodium nitroprusside arrested the growth but strongly stimulated the expression of CP with a concomitant increase in activity after the mid-exponential growth phase.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 223 (2003), S. 0 
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Rhodococcus sp. strain DK17 is able to utilize a variety of monocyclic aromatic hydrocarbons, including benzene, phenol, toluene, and o-xylene, as growth substrates. Although DK17 is unable to grow on m- and p-xylene, this strain could transform these two xylene isomers to some extent after induction by o-xylene. The major accumulating compounds formed during the degradation of m- and p-xylene by DK17 were isolated by high-pressure liquid chromatography and identified by gas chromatography-mass spectrometric and 1H nuclear magnetic resonance spectral techniques. Both xylene isomers were transformed to dihydroxylated compounds by what must be two successive hydroxylation events: m-xylene was converted to 2,4-dimethylresorcinol and p-xylene was converted to 2,5-dimethylhydroquinone. The rigorous structural identification of 2,4-dimethylresorcinol and 2,5-dimethylhydroquinone demonstrates that DK17 can perform distinct regioselective hydroxylations depending on the position of the substituent groups on the aromatic ring.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 81 (2002), S. 907-909 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An electrode structure consisting of two phases of Pt and WOx for use in thin-film fuel cells was designed and fabricated using a cosputtering system with a Pt metal and a tungsten oxide target. The coexistence of a polycrystalline Pt nanosized phase and an amorphous tungsten oxide phase in the electrode layer was confirmed by transmission electron microscopic images and x-ray diffraction data. In addition, compared with a Pt thin-film electrode, the two-phase electrode of Pt and WOx showed excellent performance for the devices because of the improved activity of the Pt metallic phase and the spill-over effect of porous tungsten oxides. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: To find the accessory proteins participating in expression and maturation of nickel-containing superoxide dismutase (NiSOD), a metal-binding protein (CbiXhp) homologous to cobaltochelatase (CbiX) of Bacillus megaterium was isolated by nickel-nitrilotriacetic acid resin from Streptomyces seoulensis. The deduced amino acid sequence of cbiXhp showed 87% and 39% identity to CbiX of Streptomyces coelicolor and that of B. megaterium, respectively. Overexpression of CbiXhp increased the activity and the expression of NiSOD in the presence and absence of nickel, but to a lesser extent in its absence. This result indicates that CbiXhp is involved in the expression of NiSOD.
    Type of Medium: Electronic Resource
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