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  • American Physical Society  (517)
  • Springer  (228)
  • American Institute of Physics  (190)
  • American Geophysical Union  (41)
  • International Union of Crystallography  (12)
  • 1
    Electronic Resource
    Electronic Resource
    Breeding of high ergosterol-producing yeast strains (2000)
    Springer
    Journal of industrial microbiology and biotechnology 25 (2000), S. 39-44 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: yeast; hybridization; breeding; ergosterol; biomass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: High ergosterol-producing yeast strains YEH-28 and YEH-56 were constructed by hybridization of two haploids with opposite mating types from different species. The fermentation conditions of hybrid strain YEH-56 were studied. The highest level of ergosterol was obtained in 30 h at 28°C and 200 rpm, when 60 ml of culture in 250-ml shake flasks was grown in fermentation medium that consisted of (per liter): 100 g glucose; 10 g peptone and 10 g yeast extract. The initial pH was adjusted to 6.0. The optimal inoculum volume was 10% (v/v). Under optimal conditions, the yield of ergosterol of YEH-28 strain is 1.96 and 1.56 times that of the parental strains YE39 and YE244, whereas that of YEH-56 is 1.98 and 1.57 times that of the parental strains YE39 and YE244, respectively. Analysis of genetic stability showed that hybrid strains YEH-28 and YEH-56 are stable genetically. Journal of Industrial Microbiology & Biotechnology (2000) 25, 39–44.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.7000004
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  • 2
    Electronic Resource
    Electronic Resource
    Selective dehydrogenation of cyclohexene to benzene using Pd-exchanged α-zirconium phosphate (1997)
    Springer
    Catalysis letters 45 (1997), S. 233-235 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The dehydrogenation of cyclohexene to benzene with ~ 85% cyclohexene conversion and 〉 80% benzene selectivity has been achieved over Pd-exchanged α-zirconium phosphate at 200°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019027931349
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  • 3
    Electronic Resource
    Electronic Resource
    Field-electron emission from polyimide-ablated films (2000)
    Springer
    Applied physics 71 (2000), S. 281-284 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.55.Ng; 79.70.+q; 81.15.Fg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Polyimide-ablated film was deposited by using pulsed laser ablation of a polyimide target, and field-electron emission from the film was observed for the first time. The turn-on field of the polyimide-ablated film is 12 V/μm. The current density is 0.725 mA/cm2, and the emission sites density is on the order of 106/cm2 at the applied field of 24 V/μm. The field-electron emission measurements indicate that this kind of film could be a new cold cathode material. It is suggested that the graphite-like clusters contained in the film play an important role in the field-electron emission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390000511
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  • 4
    Electronic Resource
    Electronic Resource
    Transmission behavior in a photorefractive polymer film (1999)
    Springer
    Applied physics 68 (1999), S. 907-910 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.65.Hw; 42.70.Jk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. When a p-polarized beam propagates through a high-performance photorefractive polymer composite, poly dimethyl-4-(4′-nitrophenylazo)benzene, its transmission behavior is influenced by three effects: the electroabsorption, the photorefractive coupling with the reflected beam from the rear surface, and the amplified scattering. From the measurements on the incidence angle dependence as well as the applied-electric-field dependence of the three effects, some conclusions are obtained. At a small incidence angle with a low applied electric field, both the amplified scattering and the electroabsorption are small whereas the coupling between the incident beam and the reflected beam plays a principal role. At a large incidence angle or with a high poling electric field, the transmission is influenced mainly by the amplified scattering and the electroabsorption. A poling electric field asymmetric loss to the amplification scattering is also observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050722
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  • 5
    Electronic Resource
    Electronic Resource
    Stratigraphy of the upper cretaceous and lower tertiary strata in the Tethyan Himalayas of Tibet (Tingri area, China) (1996)
    Springer
    International journal of earth sciences 85 (1996), S. 723-754 
    Details
    ISSN: 1437-3262
    Keywords: Biostratigraphy ; Lower Tertiary ; Indian shelf ; Upper Cretaceous ; Foraminifers ; Lithostratigraphy ; Passive continental margin ; Tethys Himalaya ; Tibet
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The 1500-m-thick marine strata of the Tethys Himalaya of the Zhepure Mountain (Tingri, Tibet) comprise the Upper Albian to Eocene and represent the sedimentary development of the passive northern continental margin of the Indian plate. Investigations of foraminifera have led to a detailed biozonation which is compared with the west Tethyan record. Five stratigraphic units can be distinguished: The Gamba group (Upper Albian - Lower Santonian) represents the development from a basin and slope to an outer-shelf environment. In the following Zhepure Shanbei formation (Lower Santonian - Middle Maastrichtian), outer-shelf deposits continue. Pebbles in the top layers point to beginning redeposition on a continental slope. Intensified redeposition continues within the Zhepure Shanpo formation (Middle Maastrichtian - Lower Paleocene). The series is capped by sandstones of the Jidula formation (Danian) deposited from a seaward prograding delta plain. The overall succession of these units represents a sea-level high at the Cenomanian/Turonian boundary followed, from the Turonian to Danian, by an overall shallowing-upward megasequence. This is followed by a final transgression — regression cycle during the Paleocene and Eocene, documented in the Zhepure Shan formation (?Upper Danian - Lutetian) and by Upper Eocene continental deposits. The section represents the narrowing and closure of the Tethys as a result of the convergence between northward-drifting India and Eurasia. The plate collision started in the Lower Maastrichtian and caused rapid changes in sedimentation patterns affected by tectonic subsidence and uplift. Stronger subsidence and deposition took place from the Middle Maastrichtian to the Lower Paleocene. The final closure of remnant Tethys in the Tingri area took place in the Lutetian.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02440107
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  • 6
    Electronic Resource
    Electronic Resource
    Optimizing computations in weather and climate prediction models (1998)
    Springer
    Meteorology and atmospheric physics 67 (1998), S. 153-168 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary To meet the challenge of developing a comprehensive weather and climate prediction model which can give realistic scenarios for many time scales, more computer power than is currently available will be needed. One possibility for alleviating this shortcoming is to increase the integration timestep. We propose and test several methods which may prove useful. One procedure is an expansion of the model dependent variables in a Taylor series. Application of this method to simple models indicates acceptable increases in timestep by a factor of five. A multi-level approach which is less complex to apply gives comparable results and is more successful when high accuracy is desired. To bypass the limiting constraint of the Courant-Friedrichs-Lewy (CFL) condition on gravity waves, an approach is suggested in which the prediction model is represented in its normal modes and the high frequency modes are balanced while the low frequency modes are predicted. Experiments with this procedure are described and in combination with the multi-level integration technique show substantial increases in integration timestep for acceptable integration results, both on the forecast and climate scale. Experiments are now underway applying this process to the NCAR/CCM3, a state-of-the-art model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01277507
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  • 7
    Electronic Resource
    Electronic Resource
    Fluxon dynamics and higher harmonics of a.c. susceptibility in HTSC (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1917-1924 
    Details
    ISSN: 0392-6737
    Keywords: Flux pinning ; flux motion ; fluxon-defect interactions ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Measurements of fundamental and higher harmonics of a.c. susceptibility on polycrystalline high-T c superconductors were carried out using a new method, involving a 2-channel dynamic analyser, allowing 20 harmonics in phase and out of phase to be measured at the same time. The critical-state model, used for describing the higher-harmonics dependence on temperature at fixed d.c. and a.c. magnetic fields, did not explain the experimental results. A frequency analysis indeed suggested that an effect of the fluxon dynamics takes place. Simple considerations lead to the conclusion that really Thermally Activated Flux Flow (TAFF), Flux Creep (FC) and Flux Flow (FF) would have a big role in determining the higher harmonics of a.c. susceptibility. Measurements on low-T c superconductors showed the occurrence of the same effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462194
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  • 8
    Electronic Resource
    Electronic Resource
    Theoretical analysis of the surface thermal wave technique for measuring the thermal diffusivity of thin slabs (1996)
    Springer
    Applied physics 62 (1996), S. 323-334 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 07.20; 44.90; 65.00
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  We present a theoretical analysis of a photothermal radiometry method of measuring thermal diffusivity, in which thermal radiation is detected from a small area, displaced by known distances from an area of modulated optical excitation. Expressions for evaluating the measurements and their main systematic errors have been worked out for thermally thin slab samples. The measurements, data and error analysis techniques are illustrated with experiments on metallic and polymeric samples. These show that the main systematic errors are associated with the spatial resolution of the apparatus and heat losses to air and thermal radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01594230
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  • 9
    Electronic Resource
    Electronic Resource
    Theoretical analysis of the surface thermal wave technique for measuring the thermal diffusivity of thin slabs (1996)
    Springer
    Applied physics 62 (1996), S. 323-334 
    Details
    ISSN: 1432-0630
    Keywords: 07.20 ; 44.90 ; 65.00
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We present a theoretical analysis of a photothermal radiometry method of measuring thermal diffusivity, in which thermal radiation is detected from a small area, displaced by known distances from an area of modulated optical excitation. Expressions for evaluating the measurements and their main systematic errors have been worked out for thermally thin slab samples. The measurements, data and error analysis techniques are illustrated with experiments on metallic and polymeric samples. These show that the main systematic errors are associated with the spatial resolution of the apparatus and heat losses to air and thermal radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01594230
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  • 10
    Electronic Resource
    Electronic Resource
    Genetic variation at the matrix metalloproteinase-9 locus on chromosome 20q12.2–13.1 (1999)
    Springer
    Human genetics 〈Berlin〉 105 (1999), S. 418-423 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Allelic association methods are better suited than linkage analysis for mapping of susceptibility genes that confer modest increases in risk in complex diseases. In both family- and population-based association studies, it is very useful to have prior knowledge of all sequence variants and the degree of linkage disequilibrium in a candidate gene region. In this study, we scanned sequence variants in a 2.2-kb promoter sequence and all 13 exons (totalling 3.3 kb) of the matrix metalloproteinase-9 gene, which is associated with coronary heart disease and a candidate for other diseases involving connective tissue remodelling, such as cancer metastasis. The sequences had a total of ten variable sites, four in the promoter, five in the coding region (three of which alter the amino acid encoded) and one in the 3' untranslated sequence. Sequence inspection suggests that some of the variants will have a functional impact on either level of expression or enzymatic activity. Tight linkage disequilibrium was detected between variants across the entire length of the gene (approximately 9 kb), and frequencies of different haplotypes were determined. The data provide an essential tool for studies of the possible contribution of genetic variation at the matrix metalloproteinase-9 locus to genetically determined susceptibility to a number of important diseases. The results also provide experimental data on the extent of linkage disequilibrium in the general population, which is yet to be resolved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004399900167
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