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  • 1
    Electronic Resource
    Electronic Resource
    Haloarcula spp able to biosynthesize exo- and endopolymers (1999)
    Springer
    Journal of industrial microbiology and biotechnology 23 (1999), S. 489-496 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: Haloarcula; Tunisian marine saltern; polyhydroxybutyrate; exopolysaccharide; ether lipids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Three halobacteria strains (T5, T6, T7), growing optimally at a sodium chloride concentration of 3.5 M, were isolated from samples collected in the Tunisian marine saltern located close to Monastir. Although they were different in colony and cell morphology, the isolates were similar in most respects and all produced a homopolyester identified spectroscopically as polyhydroxybutyrate when grown on carbohydrates. Under the same conditions, the isolates formed acidic exopolysaccharides. Acid methanolysis of their complex lipids released archaeol (2,3-di-O-phytanyl-sn-glycerol). All the isolates had polar lipid patterns characteristic of representatives of the genus Haloarcula. Partial sequence analysis of 16S rRNA genes from strain T5 confirmed its assignment to the genus Haloarcula. Although strain T5 differed phenotypically from the species Haloarcula japonica in several respects, DNA–DNA hybridization indicated that the T5 isolate is a new strain of H. japonica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900738
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  • 2
    Electronic Resource
    Electronic Resource
    The October 4th, 1983 — Magnitude 4 earthquake in Phlegraean Fields: Macroseismic survey (1984)
    Springer
    Bulletin of volcanology 47 (1984), S. 233-238 
    Details
    ISSN: 1432-0819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract On Oct. 4th, 1983 the area of Phlegraean Fields, near Naples (Southern Italy) was shaked by an earthquake of magnitude (M L) 4.0 that caused some damage in the town of Pozzuoli and its surroundings. This seismic event was the largest one recorded during the recent (1982–84) inflation episode occurred in the Phlegraean volcanic area, and a detailed macroseismic reconstruction of the event was carried out. Failing macroseismic data on other earthquakes occurred in Phlegraean Fields, the attenuation law of the intensity as a function of the distance as obtained for the Oct. 4th earthquake was compared with those obtained for other volcanic areas in central Italy —i.e., Tolfa, Monte Amiata — in order to check the reliability of the results obtained for Phlegraean Fields. The Blake's model of the earthquake of Oct. 4th, 1983 does not agree with the experimental data because isoseismals contain areas larger than those shown by the model. This result has been interpreted as an effect of energy focusing due to a reflecting layer 6–8 km deep.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01961553
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  • 3
    Electronic Resource
    Electronic Resource
    “Bacillus thermoantarcticus” sp. nov., from Mount Melbourne, Antarctica: a novel thermophilic species (1996)
    Springer
    Polar biology 16 (1996), S. 101-104 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A novel thermophilic Gram-positive bacillus, “Bacillus thermoantarcticus”, isolated from geothermal soil near the crater of Mount Melbourne, is described. The organism grows at an optimal temperature of 63°C at pH 6.0, is oxidase-positive, catalase-negative and produces an exopolysaccharide, an exocellular xylanase, an intracellular alcohol dehydrogenase and exo- and endocellularα-glucosidase(s). The sequence of 16S rDNA is very similar to that of “Bacillus thermoglucosidasius”; however, the guanine-plus-cytosine (G + C) content is 8 mol% higher. The type strain is “Bacillus thermoantarcticus” (DSM 9572).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02390430
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  • 4
    Electronic Resource
    Electronic Resource
    Isolation of five strains of thermophilic eubacteria in Antarctica (1991)
    Springer
    Polar biology 11 (1991), S. 425-429 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Five isolates of thermophilic bacteria, capable of growing at 65°C, were obtained from samples of soil collected from the Cryptogam Ridge (Mount Melbourne) and in the area north of Edmonson Point, Northern Victoria Land, Antarctica. Electron microscopy, morphological and physiological properties, lipid analyses and GC content of the isolates are described in this paper. On the basis of the results presented the organisms belong to the eubacterial domain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233077
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  • 5
    Electronic Resource
    Electronic Resource
    X-ray detection by Nb STJs above 1.4 K (1993)
    Springer
    Journal of low temperature physics 93 (1993), S. 691-696 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have designed and tested a 5×5 mm2 chip which includes 24 “island” Josephson tunnel junctions (STJs) with square, circular and diamond geometries, two arrays of 100 “island” junctions and other detection devices. The junctions were based on Nb-AlOx-Nb trilayers, obtained on Si substrate by a process consisting of underlayer Nb deposition, self-aligned insulation and anodization steps. The junction quality was extensively tested by measurements of the I–V characteristics down to T=1.2 K. IcRn values up to 2.16 mV have been obtained. Preliminary results concerning the response of these samples to 6 keV X-ray radiation are discussed. Effects of the substrate on the detector response have also been observed and reported. A rough estimation of the energy resolution gives about 700 eV. The quality of the junctions is such that the electronic noise is the predominant limitation to the ultimate resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693497
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  • 6
    Electronic Resource
    Electronic Resource
    Whole-wafer fabrication process for three-terminal double stacked tunnel junctions (2001)
    Springer
    The European physical journal 23 (2001), S. 421-425 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.50.+r Proximity effects, weak links, tunneling phenomena, and Josephson effects – 85.25.Am Superconducting device characterization, design, and modeling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A new fabrication process for three-terminal superconducting devices consisting of two Josephson junctions in a stacked configuration is reported. The process is based on the deposition of the whole Nb/AlxOy/Nb-Al/AlxOy/Nb multilayer on a Si crystalline wafer without any vacuum breaking. Lift-off techniques, anodization processes and a SiO film deposition have been adopted for patterning and insulating the two tunnel stacked junctions. Devices have been characterized in terms of current-voltage (I-V) curves and Josephson critical current vs. the externally applied magnetic field. They show high quality factors (V m values up to 65 mV at 4.2 K), and good current uniformity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170032
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  • 7
    Electronic Resource
    Electronic Resource
    Direct Evidence of Macroscopic Quantum Effects at High Temperature (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 727-733 
    Details
    ISSN: 1572-9605
    Keywords: Josephson effect ; macroscopic quantum tunneling and coherence ; quantum computing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We present experiments on macroscopic quantum effects in Josephson junctions with different relevant junction parameters at a temperature well above the classical-quantum crossover temperature. This has been possible by extending the measurements on the escape rate out of the metastable state at higher sweeping frequency (dI/dt up to 100 A/sec.) in order to induce non-stationary conditions in the energy potential describing the junction dynamics. The non-stationary regime for the system allows a direct observation of energy level quantitation when the rate of change of the external energy, measured in terms of the level spacing, is fast with respect to the thermal transitions between levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007724807820
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  • 8
    Electronic Resource
    Electronic Resource
    The relaxation times of an STJ detector: Role of the proximity effect (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 951-958 
    Details
    ISSN: 1572-9605
    Keywords: Tunnel junction ; proximity effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The behavior of a superconducting tunnel junction detector (STJ) in the regime of low excitation is described, and the characteristic times of the dynamical response are discussed. The effect of a proximity layer in the STJ is analyzed in terms of the McMillan model. A set of phenomenological equations for the proximized STJ driven out of equilibrium is obtained, showing the importance of the role of the proximity effect in the dynamics of the device.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00732278
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    The use of principal component analysis (PCA) for pattern recognition in Eucalyptus grandis wood biodegradation experiments (1998)
    Springer
    World journal of microbiology and biotechnology 14 (1998), S. 487-490 
    Details
    ISSN: 1573-0972
    Keywords: Ascomycete ; basidiomycete ; Eucalyptus grandis ; principal component analysis ; wood biodegradation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Eucalyptus grandis wood was biodegraded by eight basidiomycetes and two ascomycetes. Four groups of decayed wood samples were recognized based on the principal component analysis (PCA) of weight and component loss data. Among the 10 fungal species studied, no selective lignin biodegradation was achieved. PCA was very efficient in recognizing wood decay patterns and seems to be a useful tool to analyse large group of weight- and component-loss data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008875730177
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