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  • 1
    Electronic Resource
    Electronic Resource
    Activation of Pt-Rh(100) Alloy and Pt/Rh(100) and Rh/Pt(100) Bimetallic Surfaces by Chemical Reconstruction (1994)
    s.l. : American Chemical Society
    Langmuir 10 (1994), S. 4530-4533 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00024a024
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  • 2
    Electronic Resource
    Electronic Resource
    The role of Rh on Pt-based catalysts: structure sensitive NO + H2 reaction on Pt(110) and Pt(100) and structure insensitive reaction on Rh/Pt(110) and Rh/Pt(100) (1994)
    Springer
    Catalysis letters 28 (1994), S. 161-166 
    Details
    ISSN: 1572-879X
    Keywords: Pt(110) ; Pt(100) ; Rh/Pt(110) ; Rh/Pt(100) ; activity ; structure sensitivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The catalytic activity of the Pt(110) surface for the reaction of NO + H2 was much less than that of the Pt(100) surface. However, the catalytic activity of the Rh deposited Pt(1l0) surface was almost equal to that of the Rh deposited Pt(100) surface. That is, the catalytic reaction of NO + H2 on Pt(110) and Pt(100) surfaces is highly structure sensitive, but it changes to structure insensitive by the deposition of Rh atoms. These results are rationalized by formation of an active overlayer on the Pt(110) and Pt(100) surfaces, which is very analogous to the Rh-O/Pt-layer formed on Rh/Pt(100), Pt/Rh(100) and Pt-Rh(100) alloy surfaces during catalysis. The formation of the common overlayer of Rh-O/Pt-layer during catalysis is responsible for the structure insensitive catalysis of Rh deposited Pt-based catalysts, which is an important role of Rh in a three way catalyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806045
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  • 3
    Electronic Resource
    Electronic Resource
    Isolation of intermediate compounds of catalytic reactions on single crystal surfaces (1992)
    Springer
    Catalysis letters 12 (1992), S. 1-6 
    Details
    ISSN: 1572-879X
    Keywords: Surface carbide ; surface nitride ; intermediates ; NO + H2 reaction ; methanation reaction ; catalysis on single crystal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A key intermediate of the methanation reaction on nickel catalyst is a carbidic carbon. Accumulated carbidic intermediates on Ni(100) gives a p(2×2) p4g structure, whereas that on Ni(111) is too complex to be solved. A single domain carbide layer accidentally on Ni(111) allowed us to solve the structure explicitly. Comparison of the carbide layer on Ni(100) and that on Ni(111) showed that the carbon atoms are arranged by forming the same ordered structure. The carbide layers prepared on Ni(100), Ni(111) and Ni(110) have almost equal decomposition temperatures. Consequently, we can conclude that the same overlayer compound is formed on the three surfaces. Furthermore, the hydrogenation of the p4g carbide on Ni(100) occurs at almost equal rate to the turnover frequency of the catalytic methanation reaction. The structure insensitive methanation reaction on Ni(100), Ni(111) and Ni(110) is responsible for the same intermediate compound on these surfaces. The same strategy was applied to the reaction of NO with H2 on Pd(100), Rh(100) and Pt-Rh(100) surfaces, and ac(2×2)-N overlayer was isolated on each of these. The hydrogenation of the isolatedc(2×2)-N produced predominantly NH species, which indicates slow NH species hydrogenation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00767183
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  • 4
    Electronic Resource
    Electronic Resource
    Oxygen induced direct hydrogenation of CO on Ni(100) surface (1994)
    Springer
    Catalysis letters 25 (1994), S. 105-113 
    Details
    ISSN: 1572-879X
    Keywords: Hydrogenation of CO ; direct hydrogenation of CO ; intermediates of CO hydrogenation ; Ni(100)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A trace amount of oxygen in H2 promotes a new type of direct hydrogenation reaction of adsorbed CO on Ni(100) surface. The formation of HxCOy was suggested by high resolution electron energy loss spectroscopy (HREELS) and thermal desorption spectroscopy (TDS). HREEL spectra showed the formation of surface hydroxyl (OH) and the C-H bonds of HiCOy species but no carbonyl (C=O) loss peak was detected although thermal desorption yielded large amount of CO. The H x CO y undergoes the decomposition at 400–450 K on the hex-OH Ni(100) surface, which yielded CO, CO2, H2 and H2CO. It was confirmed that no C-H bond formation occurs on c(2 × 2)-O, p(2 × 2)-O Ni(100) and hex-OH Ni(100) as well as on clean Ni(100) surfaces. This fact indicates that the gas phase oxygen may induce the direct hydrogenation of CO to form H x CO y , which is analogous to the hydrogenation of O to form hex-OH onNi(100).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00815420
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  • 5
    Electronic Resource
    Electronic Resource
    Spectroscopic evidence for the formation of CHx species in the hydrogenation of carbidic carbon on Ni(100) (1992)
    Springer
    Catalysis letters 16 (1992), S. 407-412 
    Details
    ISSN: 1572-879X
    Keywords: CH x species ; carbide ; methanation ; hydrogenation ; nickel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The CH x species formed on Ni(100) by hydrogenation of carbidic carbon have been detected using high resolution electron energy-loss spectroscopy (HREELS). Exposures of carbidic carbon to 1×10−7 Torr H2 and D2 at 313 K for 20 min produce CH x and CD x species, respectively. These species are identified by two energy-loss peaks for CH x at 2970 and 1380 cm−1 and only one peak for CD x at 1980 cm−1. Because of the existence of the intense peak at 1380 cm−1, in the range of a scissors mode for CH2 and a symmetric deformation mode for CH3, the CH x species are tentatively ascribed to CH2 and/or CH3. The CD x species undergo decomposition at 330–370 K in UHV as well as in hydrogen below 10−7 Torr. No stable CH x species are observed above 400 K, which is lower than the normal reaction temperature of the methanation reaction (500 K).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764898
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  • 6
    Electronic Resource
    Electronic Resource
    The Eiken Latex test for detection of a cryptococcal antigen in cryptococcosis (1994)
    Springer
    Mycopathologia 127 (1994), S. 131-134 
    Details
    ISSN: 1573-0832
    Keywords: Cryptococcal antigen ; Eiken Latex ; Latex agglutination test ; Murine disseminated cryptococcosis ; Pastorex® Cryptococcus ; Pulmonary cryptococcosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A latex agglutination test for cryptococcal antigen, the Eiken Latex test (Eiken, Tokyo, Japan), was compared with a monoclonal antibody-based agglutination assay, Pastorex® Cryptococcus (Diagnostics Pasteur, Marneur-la-Coquette, France). In a murine model of disseminated cryptococcosis, the kinetics of the antigen titers by the Eiken Latex were similar to those by the Pastorex® Cryptococcus, but sensitivity was much higher. In HIV-negative patients with pulmonary cryptococcosis, a cryptococcal antigen was detected in 6 of 10 patients by the Eiken Latex test and in only 3 of those patients by the Pastorex® Cryptococcus. The results indicate that the Eiken Latex is more sensitive for the detection of the cryptococcal antigen, even in non-disseminated cryptococcosis. The sensitivity and specificity of the Eiken Latex were examined using 195 sera from 25 patients with pulmonary cryptococcosis and 170 patients with non-cryptococcosis. The cutoff value of ≥ 1:8 showed a sensitivity of 76% (19/25) and a specificity of 98.9% (168/170).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01102911
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  • 7
    Electronic Resource
    Electronic Resource
    A model of Pt-Rh catalyst prepared by electro-chemical deposition of Rh ions on Pt(100) surface (1994)
    Springer
    Topics in catalysis 1 (1994), S. 95-102 
    Details
    ISSN: 1572-9028
    Keywords: Electro-catalysis ; metal deposition ; alloys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract When Pt-Rh(100) alloy surface was exposed to NO or O2 at temperatures higher than 400 K, a characteristic p(3 × 1) LEED pattern appeared with segregation of Rh atoms on the surface. It was shown that when a Rh-deposited Pt(100) surface is heated in NO or O2 the same 5 × 10−8 Torr of H2 at room temperature, the p(3 × 1) pattern disappears but is readily recovered 5 × 10−8 Torr of H2 at room temperature, the p(3 × 1) pattern disappears but is readily recovered by exposing to O2 of 1 × 10−7 Torr at room temperature. The growth of a Rh-O overlayer on Pt layer is responsible for the formation of the p(3 × 1) structure on either the Pt-Rh(100) alloy or Pt(100) surface, and this peculiar surface may correspond to the active surface of the Pt-Rh catalyst for NO x reduction
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01379579
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  • 8
    Electronic Resource
    Electronic Resource
    Systematic characterization of curved DNA segments randomly cloned from Escherichia coli and their functional significance (1991)
    Springer
    Molecular genetics and genomics 226 (1991), S. 367-376 
    Details
    ISSN: 1617-4623
    Keywords: Curved DNA ; Protein H-NS (or Hla) ; E. coli chromosome ; Regulation of transcription
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In addition to the set of curved DNA segments isolated previously from Escherichia coli, another set of curved DNA segments has now been isolated. To gain an insight into the functional significance of these curved DNA sequences, systematic analyses were carried out, which included not only mapping of the precise locations of the segments on the E. coli chromosome but also clarification of the gene organization in the chromosomal regions surrounding the curved DNA sequences. It was demonstrated that most of the curved DNA sequences, which have been characterized so far, appear to be located immediately upstream of the coding sequences of adjacent genes. It was also demonstrated that an E. coli histone-like protein, named H-NS (or H1a), exhibits a strong affinity for naturally occurring curved DNA sequences in regions upstream promoters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00260648
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  • 9
    Electronic Resource
    Electronic Resource
    Molecular analysis of the Escherichia coli has gene encoding a DNA-binding protein, which preferentially recognizes curved DNA sequences (1991)
    Springer
    Molecular genetics and genomics 230 (1991), S. 332-336 
    Details
    ISSN: 1617-4623
    Keywords: Curved DNA-Protein H-NS (or H1a) ; E. coli chromosome ; Regulation of transcription
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We previously demonstrated that the E. coli protein, H-NS (or Hla), encoded by the gene hns (or osmZ or bglY preferentially recognizes curved DNA sequences in vitro. In order to gain further insight into the complex function of H-NS and the significance of DNA curvature, we constructed a structurally defined hns deletion mutant on the E. coli chromosome. The hns deletion mutant thus obtained showed a variety of phenotypes previously for other lesions in hns. It was further demonstrated that, in this hns deletion background, numerous E. coli cellular proteins were either strongly expressed or remarkably repressed, as compared to their expression levels in wild-type cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00290685
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  • 10
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    Activation of Pt-Rh(100) Alloy and Pt/Rh(100) and Rh/Pt(100) Bimetallic Surfaces by Chemical Reconstruction (1994)
    American Chemical Society
    Details
    Publication Date: 1994-12-01
    Print ISSN: 0743-7463
    Electronic ISSN: 1520-5827
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society
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