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  • 1
    Electronic Resource
    Electronic Resource
    Reactions of N and NO on Pt(335) (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 9569-9576 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: As part of a study of species important in automotive exhaust chemistry, the reactivity of atomic N and NO on Pt(335) at low temperature has been studied. The atomic N was produced by dissociating adsorbed NO with a 76 eV electron beam. Cross sections for electron-stimulated desorption and dissociation are estimated for NO on terrace and step sites. Terrace NO is at least five times more likely to desorb than to dissociate. Step NO has a lower desorption cross section than terrace NO, but probably a higher dissociation cross section. Temperature-programmed desorption was used to monitor desorption, dissociation, and the formation of N2 and N2O from adsorbed N and NO. Five distinct desorption states of N2 formed by NO dissociation are identified. The dominant N2 peak (435 K) comes from electron-dissociated step NO; its desorption temperature is higher than the N2 peaks from electron-dissociated terrace NO. Coadsorbed N and NO react to form N2O even below 100 K, with an activation barrier of ∼6 kcal/mol. Only terrace NO participates in this reaction; step NO does not react to form N2O. This site dependence resembles that for CO oxidation on Pt(112) and Pt(335) and can be rationalized with simple steric considerations. All of the forms of atomic N participate in N2O formation, but that formed by the dissociation of step NO exhibits the lowest reaction temperature. Hence, the same N atoms that only recombine to form N2 at 435 K, react with NO to form N2O at 100 K. We found no evidence for an NO reaction with N atoms to form N2 and adsorbed O, or for NO formation from the recombination of adsorbed N and adsorbed O2. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475254
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  • 2
    Electronic Resource
    Electronic Resource
    Structures, Phase Transformations, and Dielectric Properties of Pyrochlores Containing Bismuth (1997)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 80 (1997), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The structures, phase transformations, and dielectric properties of pyrochlore ceramics containing bismuth were studied. The relation between the orthorhombic and cubic pyrochlores in the Bi2O3-ZnO-Nb2O5 (BZN) system has been investigated. The effect of bismuth in distorted cubic pyrochlore structures is discussed. BZN compositions with pyrochlore structures have excellent dielectric properties, very low dielectric loss, and high dielectric constants with stable frequency and temperature dependence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1997.tb03189.x
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  • 3
    Electronic Resource
    Electronic Resource
    Relatively low plasma leptin concentrations precede weight gain in Pima Indians (1997)
    [s.l.] : Nature Publishing Group
    Nature medicine 3 (1997), S. 238-240 
    Details
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Leptin, the product of the ob gene1, is a hormone, produced by adipose cells, that inhibits food intake2–5 and increases energy expenditure2,3 in rodents. In humans, plasma leptin concentrations correlate closely with the size of the adipose tissue depot; however, there is considerable ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nm0297-238
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  • 4
    Electronic Resource
    Electronic Resource
    FP-21399 blocks HIV envelope protein-mediated membrane fusion and concentrates in lymph nodes (1997)
    [s.l.] : Nature Publishing Company
    Nature biotechnology 15 (1997), S. 343-348 
    Details
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] The identification of fusin and other chemokine receptors as coreceptors for HIV-1 has renewed the interest in agents that may prevent viral entry. Polyanionic compounds such as dextran sulfate, curdlan sulfate, and suramin act on the V3 loop of the viral envelope and may prevent its interaction ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nbt0497-343
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  • 5
    Electronic Resource
    Electronic Resource
    A plant cyclin-dependent kinase inhibitor gene (1997)
    [s.l.] : Nature Publishing Group
    Nature 386 (1997), S. 451-452 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Mammalian cyclin-dependent kinase (CDK) inhibitors are important in the regulation of the cell cycle and in development1. Using the yeast two-hybrid system2 we have identified a CDK inhibitor gene in Arabidopsis thaliana which we have named ICKl. The gene product has unique structural features and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/386451a0
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  • 6
    Electronic Resource
    Electronic Resource
    High-intensity focused ultrasound in the treatment of experimental liver tumour (1997)
    Springer
    Journal of cancer research and clinical oncology 123 (1997), S. 219-223 
    Details
    ISSN: 1432-1335
    Keywords: Key words Liver neoplasm ; Ultrasound therapy ; Sonography monitoring
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  This project aimed to determine the adequacy and accuracy of high-intensity focused ultrasound (HIFU) for ablating experimental liver tumour, and to assess imaging methods for monitoring the therapeutic results. The rabbit liver pseudotumour model was established by injection of Freund’s complete adjuvant into the liver; the animals then received HIFU therapy via laparotomy at the focal point of the beam (1.1 MHz, 500 W/cm2, 20 s). The rabbits were sacrificed at scheduled times after treatment and liver tumours were examined histologically. Sequential imaging of the liver tumour was performed before and after HIFU treatment. HIFU accurately destroyed the rabbit liver tumour and induced coagulation necrosis 24 h later. Sonographic imaging studies revealed that characteristic changes occurred. A hyperechoic mass turned to a hypoechoic lesion with no Doppler signal, and a high echogenic rim appeared 24 h after HIFU treatment, correlating well with the pathological changes of a sonoablated lesion. These results verify that HIFU has the power to ablate liver tumour quite adequately and accurately, and that sonography is useful for monitoring sonoablated liver tumour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01240318
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  • 7
    Electronic Resource
    Electronic Resource
    High-intensity focused ultrasound in the treatment of experimental liver tumour (1997)
    Springer
    Journal of cancer research and clinical oncology 123 (1997), S. 219-223 
    Details
    ISSN: 1432-1335
    Keywords: Liver neoplasm ; Ultrasound therapy ; Sonography monitoring
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This project aimed to determine the adequacy and accuracy of high-intensity focused ultrasound (HIFU) for ablating experimental liver tumour, and to assess imaging methods for monitoring the therapeutic results. The rabbit liver pseudotumour model was established by injection of Freund's complete adjuvant into the liver; the animals then received HIFU therapy via laparotomy at the focal point of the beam (1.1 MHz, 500 W/cm2, 20 s). The rabbits were sacrificed at scheduled times after treatment and liver tumours were examined histologically. Sequential imaging of the liver tumour was performed before and after HIFU treatment. HIFU accurately destroyed the rabbit liver tumour and induced coagulation necrosis 24 h later. Sonographic imaging studies revealed that characteristic changes occurred. A hyperechoic mass turned to a hypoechoic lesion with no Doppler signal, and a high echogenic rim appeared 24 h after HIFU treatment, correlating well with the pathological changes of a sonoablated lesion. These results verify that HIFU has the power to ablate liver tumour quite adequately and accurately, and that sonography is useful for monitoring sonoablated liver tumour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01240318
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation of textured Mg2TiO4 thin filmson Si substrate by atmospheric pressure metallorganic chemical vapour deposition (1997)
    Springer
    Journal of materials science 8 (1997), S. 159-162 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Highly crystalline and fully [1 0 0]-textured Mg2TiO4 thin films have been successfully prepared on Si(1 0 0) and (1 1 1) substrate by using atmospheric pressure metallorganic chemical vapour deposition. Magnesium acetylacetonate was used as the metallorganic source. The films were produced in a horizontal warm-wall reactor. X-ray diffraction experiments provided evidence that the Mg2TiO4 thin films on Si substrate were fully textured with [1 0 0] orientation perpendicular to the substrate surface. The films obtained a very smooth and densely packed surface morphology. The relationship between substrate temperature and crystallographic orientations was also considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018542029224
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  • 9
    Electronic Resource
    Electronic Resource
    Coordination compounds derived from 1,1′-bis(N-formyl-N′-substituted thiourea)ferrocene derivatives and copper chloride; crystal structure of the copper chloride 1,1′-bis(N-formyl-N′-isopropylthiourea)ferrocene coordination polymer (1997)
    Springer
    Transition metal chemistry 22 (1997), S. 561-564 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Coordination compounds derived from 1,1′-bis(N-formyl-N′-substituted thiourea)ferrocene derivatives have been prepared. Elemental analyses indicate the presence of a 1:1 metal-to-ligand ratio. I.r. and 1H-n.m.r. spectra show that the intramolecular hydrogen bonds in the corresponding ligands remain intact upon coordination. The single crystal structure of one such compound, a coordination polymer, was determined. CuII was reduced to CuI during the coordination process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018504506237
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  • 10
    Electronic Resource
    Electronic Resource
    Enhanced production of taxol in suspension cultures of Taxus chinensis by controlling inoculum size (1997)
    Springer
    Biotechnology letters 19 (1997), S. 353-356 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Inoculum size (1.5-6.0g dry weight/l) significantly affected cell growth and accumulation of intracellular and extracellular taxol in Taxus chinensis. A shorter cultivation time and a higher biomass productivity were achieved using inoculum size of 6.0g DW/l. Both the intracellular content and total production of taxol were increased almost 30% with an increase of inoculum size from 1.5 to 3.0g DW/l, while an even higher inoculum size decreased taxol formation. The extracellular taxol concentration was relatively higher (0.091mg/l) at low inoculum sizes of 1.5 and 2.0g DW/l; and in various cases it was less than 25% of the total amount of taxol produced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018355002041
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