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  • 11
    Electronic Resource
    Electronic Resource
    Proximity effects in all refractory Josephson tunnel junctions
    Amsterdam : Elsevier
    Physica B: Physics of Condensed Matter 194-196 (1994), S. 1745-1746 
    Details
    ISSN: 0921-4526
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4526(94)91372-2
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  • 12
    Electronic Resource
    Electronic Resource
    Photochemical ring contraction of dihydro-1,4-benzothiazines
    Amsterdam : Elsevier
    Tetrahedron Letters 35 (1994), S. 3365-3366 
    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)76909-7
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  • 13
    Electronic Resource
    Electronic Resource
    Effect of complex polyphenols and tannins from red wine on DNA oxidative damage of rat colon mucosa in vivo (2000)
    Springer
    European journal of nutrition 39 (2000), S. 207-212 
    Details
    ISSN: 1436-6215
    Keywords: Key words Antioxidant – oxidative stress – flavonoids – comet assay – isolated colonocytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Notes: Summary Background: Dietary polyphenols have been reported to have a variety of biological actions, including anti-carcinogenic, antioxidant and anti-inflammatory activities. Aim of the study: In the present study we have evaluated the effect of an oral treatment with complex polyphenols and tannins from red wine and tea on DNA oxidative dammage in the rat colon mucosa. Methods: Isolated colonocytes were prepared from the colon mucosa of rats treated for ten days with either wine complex polyphenols (57.2 mg/kg/d) or thearubigin (40 mg/kg/d) by oral gavage. Colonocyte oxidative DNA damage was analysed at the single cell level using a modification of the comet assay technique. Results: These results show that wine complex polyphenols and tannins induce a significant decrease (−62% for pyrimidine and −57% for purine oxidation) in basal DNA oxidative damage in colon mucosal cells without affecting the basal level of single-strand breaks. On the other hand, tea polyphenols, namely a crude extract of thearubigin, did not affect either strand breaks or pyrimidine oxidation in colon mucosal cells. Conclusions Our experiments are the first demonstration that dietary polyphenols can modulate in vivo oxidative damage in the gastrointestinal tract of rodents. These data support the hypothesis that dietary polyphenols might have both a protective and a therapeutic potential in oxidative damage-related pathologies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003940070013
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  • 14
    Electronic Resource
    Electronic Resource
    High-quality YBCO d.c. SQUIDs based on bicrystal substrates (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 2019-2024 
    Details
    ISSN: 0392-6737
    Keywords: Proximity effects, tunneling phenomena, and Josephson effects ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary An analysis of superconducting transport properties and magnetic behaviour of d.c. SQUIDs employing YBCO bicrystal grain boundary junctions (GBJs) has been performed. GBJs have been obtained by deposition of ac-axis-oriented YBCO film on a SrTiO3 bicrystal substrate by ICM sputtering technique. Experimental measurements on a YBCO d.c. SQUID with a misorientation angle θ=20° are reported. The SQUID shows a critical temperatureT c∼89 K and a high critical current densityJ c∼3·106 A/cm2 atT=4.2 K. Current-voltage characteristics are close to the behaviour predicted by the resistively shunted junction (RSJ) model and the temperature dependenceJ c(T) shows a linear behaviour at small reduced temperatures and a depressedJ c value close toT c. High-quality flux-voltage curves have been found upT=87 K over a large range of magnetic field. The high reproducibility and the good control of transport properties by the variation of θ make YBCO bicrystal GBJs very useful for applications in electronics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02471861
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  • 15
    Electronic Resource
    Electronic Resource
    Structural investigation of YBCO films and bicrystal grain boundary junctions (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 2025-2030 
    Details
    ISSN: 0392-6737
    Keywords: Superconducting films ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We present a structural analysis of YBCO superconducting thin films fabricatedin situ by Inverted Cylindrical Magnetron (ICM) sputtering on commercial SrTiO3 single-crystal and bicrystal substrates. A detailed structural characterization of the superconductor films was performed by using single-crystal X-ray diffractometry confirming that YBCO films have a strongc-axis orientation of the grains with a small mosaic spread. In the films grown on bicrystal substrates we observed a strong correlation with the lattice structure of the substrate. In addition, a surface analysis of the region across the grain boundary edge has been performed by using scanning electron microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02471862
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  • 16
    Electronic Resource
    Electronic Resource
    HTSC grain boundary weak links employing high-quality ICM sputtered YBCO films (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1967-1972 
    Details
    ISSN: 0392-6737
    Keywords: Proximity effects, tunneling phenomena and Josephson effects ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Bicrystal grain boundary junctions of YBCO have been fabricated by using the Inverted Cylindrical Magnetron d.c. sputtering technique. The main characteristics of the junction behaviour are reported. Some aspects of the experimental results are discussed in the framework of existing models developed for describing weak-link structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02471853
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  • 17
    Electronic Resource
    Electronic Resource
    Effect of gibberellic acid treatments, environmental conditions, and genetic background on the expression of theparthenocarpic fruit mutation in tomato (1999)
    Springer
    Protoplasma 208 (1999), S. 18-25 
    Details
    ISSN: 1615-6102
    Keywords: Environment ; Flower development ; Gibberellin ; Lycopersicon esculentum ; Parthenocarpy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Theparthenocarpic fruit (pat) allele causes a complex syndrome affecting different aspects of tomato reproductive development. This mutation affects stamen (reduced length and carpelloidy), ovule (arrested integument growth and unviability), and ovary (autonomous growth, i.e., parthenocarpy) development;pat mutant plants therefore have reduced male and female fertility. We studied the phenotypic expression patterns of thepat gene after treatments with gibberellic acid (GA3) and under different growth seasons (late spring and autumn) and genetic backgrounds (backcross [BC] population after interspecific cross). GA3 treatments were only effective in restoring carpelloid anthers to the wild-type phenotype. Compared to late spring, mutant plants grown in autumn had a lower frequency of carpelloid anthers and aberrant ovules and a higher seed set. Inflorescence position also affected thepat expression; upper inflorescences had low frequency of short anthers and aberrant ovules and an increased tendency to set seeds,pat expressivity was more variable in BC1 plants segregating after interspecific cross withLycopersicon pennellii than in the originalL. esculentum line. Therefore, a role for minor genes that modify the quantitative expression of thepat mutation is postulated and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279071
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  • 18
    Electronic Resource
    Electronic Resource
    Interplay between structural anisotropy and order parameter symmetry effects in transport properties of YBa Cu O grain boundary Josephson junctions (2002)
    Springer
    The European physical journal 28 (2002), S. 3-7 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.20.Rp Pairing symmetries (other than s-wave) – 74.50.+r Proximity effects, weak links, tunneling phenomena, and Josephson effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We have designed an experiment that could allow to investigate, on the same sample, the interplay between the morphological anisotropy of high critical temperature superconductors and the effects related to the order parameter symmetry. To this aim we have employed c-axis tilt biepitaxial grain boundary YBa2Cu3O 7 - δ Josephson junctions and measured the junction properties for different junction interface orientations. The results give evidence of the possibility to tune normal state resistance and critical current density of a Josephson junction almost independently of each other. We interpret the results of this experiment as an indication that Cooper pairs and quasi-particles transport properties may be ruled by different mechanisms. Measurements apparently give evidence of the possibility to determine to some extent the presence of “π-loops” and “0” loops along the same grain boundary line.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00194-9
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  • 19
    Electronic Resource
    Electronic Resource
    A two channel model as a possible microscopic configuration of the “barrier” in high-T c grain boundary junctions (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 387-390 
    Details
    ISSN: 1572-9605
    Keywords: Josephson junction ; high-T c , grain boundary ; bicrystal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract High-T c superconductors are intensively studied for applications such as biomagnetism, but the great difficulties in making integrated dc SQUIDs have slowed down applications in the biomedical field. Moreover, magnetic noise and energy resolution are not always low enough to permit measurements of human body magnetic signals. Noise in bicrystal and biepitaxial grain boundary junctions has been extensively analyzed, and both structures showed similar 1/f noise behaviors. In order to account for the experimental results, different models describing grain boundary junctions have been made, each able to explain some aspects of the phenomenology. In this work we suggest that the “barrier” is constituted by a large number of microscopic weak links in parallel, and we analyze the effects of such a model on noise properties and the temperature dependences of the critical current, finding a good agreement with most experiments carried out on grain boundary junctions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724574
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  • 20
    Electronic Resource
    Electronic Resource
    Sputtered YBCO bicrystal dc-SQUIDS (1996)
    Springer
    Journal of superconductivity 9 (1996), S. 513-517 
    Details
    ISSN: 1572-9605
    Keywords: High-T csuperconductors ; bicrystal junctions ; dc-SQUID
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract An analysis of YBa2Cu3O7 −δ bicrystal dc-SQUIDs is reported. The devices have been fabricated by dc cylindrical magnetron sputtering from a single target. SQUIDs operating at the liquid nitrogen temperature have been obtained employing high-quality films fabricatedinsitu exhibiting a critical temperature as high as 89–90 K. Two different geometrical configurations for the loop inductance have been investigated. A good control of the transport parameters of the junctions, together with a reasonable correlation between the calculated inductance and the voltage response to an applied magnetic field, have been achieved. A study of the voltage response vs. the applied magnetic field as a function of both temperature and bias current has been carried out. SQUIDs working at temperatures as high as 87 K have been characterized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00723523
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