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  • 1
    Electronic Resource
    Electronic Resource
    Q-factor and bandwidth estimation of sharp resonant phenomena in transmission line systems with grounding points (1990)
    Springer
    Electrical engineering 73 (1990), S. 35-43 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Übersicht Es gibt Übertragungsmehrleitersysteme, die mit Erdungspunkten an beiden Enden versehen sind. Auf Grund stehender Wellen treten bei solchen Systemen Resonanzerscheinungen auf, die für bestimmte enge Frequenzbereiche große Amplitudenschwankungen von Dämpfungsmaß, Phasenmaß und Wellenwiderstand aufweisen. Eine einfache Näherungsmethode hoher Genauigkeit für die Berechnung von Gütefaktor und Bandbreite des Frequenzganges der die Wellenausbreitung charakterisierenden Parameter wird ausführlich behandelt.
    Notes: Contents Transmission line systems exist with grounding points at both the sending and receiving ends; due to standing wave phenomena the transmission performance of such systems is critically affected in the neighbourhood of certain resonant frequencies — attenuation, phase constant and characteristic impedance showing large amplitude variations in a relatively small frequency range. In this paper a simple accurate method to estimate the quality factor and the bandwidth of the resonant curves describing the frequency behaviour of the transmission line propagation parameters is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01573462
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  • 2
    Electronic Resource
    Electronic Resource
    Application of a first order perturbation method to the analysis of almost periodic multiport network chains (1990)
    Springer
    Electrical engineering 73 (1990), S. 433-441 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Übersicht Die Berechnung der Wellenparameter von Ketten aus Mehrleiter-Übertragungsystemen bietet keine Schwierigkeit im Fall streng periodischer Ketten. Wird die Periodizität gestört, wie es in der Praxis häufig vorkommt, so wird die Berechnung sehr mühsam, besonders dann, wenn die Kette viele Glieder enthält. Um diese Schwierigkeit zu überwinden, schlagen wir die Anwendung einer gewöhnlichen Störungsmethode erster Ordnung vor, die es gestattet, eine einfache Beziehung zwischen den Wellenparametern der Kette und den Wellenparametern der einzelnen Glieder zu gewinnen. Die Methode wird zuerst für allgemeine 2n-Tore entwickelt und danach auf den Sonderfall der Zweitor-übertragungssysteme angewandt. Die Genauigkeit des Verfahrens läßt sich aus der graphischen Darstellungen numerischer Ergebnisse ablesen.
    Notes: Contents Propagation parameters of cascaded multiconductor transmission structures can be easily determined when the chain is strictly periodic. If periodicity is somehow perturbed, which is usually the real case, the evaluation of the chain propagation parameters becomes very complex, especially when the number of cascaded sections is large. To handle this situation we propose an approach based on a standard first order perturbation method allowing a simple relationship to be found between the chain parameters and those characterizing its component cells. The method is first developed for general 2n-port networks and later particularized for the special case of two-port transmission-line systems. Graphs with numerical results are presented allowing the accuracy of the method to be checked.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01574103
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  • 3
    Electronic Resource
    Electronic Resource
    Les fonctions analytiques comme ultra-distributions dans le calcul opérationnel (1958)
    Springer
    Mathematische Annalen 136 (1958), S. 58-96 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01350287
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  • 4
    Electronic Resource
    Electronic Resource
    Les séries de multipôles des physiciens et la théorie des ultradistributions (1967)
    Springer
    Mathematische Annalen 174 (1967), S. 109-142 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01360813
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  • 5
    Electronic Resource
    Electronic Resource
    Identification of an ADPG-dependent trehalose synthase in Saccharomyces (1989)
    Springer
    Current genetics 16 (1989), S. 81-87 
    Details
    ISSN: 1432-0983
    Keywords: Trehalose accumulation ; Sacckaromyces ; Trehalose-6-phosphate synthase ; ADPG-dependent ; Trehalose-6-phosphate synthase (EC 2.4.1.15) ; trehalase (EC 3.2.1.28) ; pyruvate kinase (EC 2.7.1.40)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Uridine diphosphoglucose is not the sole donor for trehalose synthesis in yest cells: an ADPG-dependent trehalose synthase, has been identified in mutant strains with undetectable UDPG-dependent trehalose-6-P synthase activity. Genetic and chromatographic studies indicate that the two activities correspond to different proteins. The apparent K Km for the nucleotide is similar for both enzymes, and Mg2+ is also required for both activities; however, a striking difference was observed with respect to ATP.Mg activation. This newly determined enzymatic activity in Saccharomyces clarifies previous contradictory results with mutant strains that are able to accumulate trehalose during growth yet whose UDPG-dependent trehalose synthase activity is undetectable in vitro.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393399
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  • 6
    Electronic Resource
    Electronic Resource
    Study of the acid-base properties of leaf litter extracts (1998)
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 479-486 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The acid-base properties of four leaf litter extracts, LLE (eucalyptus, fern, oak and chestnut coverture), were characterized by synchronous fluorescence (SyF) spectroscopy and compared with those of two fulvic acids (FA) extracted from two different horizons (0–5 and 5–15 cm) of an oak forest soil. The characterization was based on the variation with the pH of the properties of the fluorescent structures present in the samples, which function as probes and provide a macroscopic image of their acid-base properties. These sets of SyF spectra collected as a function of the pH show fingerprinting potential. They were treated by a self-modeling curve resolution procedure, evolving factor analysis with a gradient concentration window (EFA-GCW), to reduce the raw spectral data to the number of components, their spectra, and SyF intensity profiles (pH distribution diagrams). Four acid-base systems were detected for all samples of LLE and FA with pKas ranging from 2.5 to 10.0 (pKas about 3, 5, 7 and 9, except for the fern LLE sample which showed pKas about 5, 7, 9 and 10). A similarity analysis of the spectra of the components, performed by cluster analysis, showed that the most acidic fluorescent structures of the LLE are not similar to those of the soil FA, but the less acidic are.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050929
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  • 7
    Electronic Resource
    Electronic Resource
    Sensitivity of the Meiofaunal Copepod Tisbe longicornis to K2Cr2O7 Under Varying Temperature Regimes (1998)
    Springer
    Bulletin of environmental contamination and toxicology 61 (1998), S. 391-396 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001289900775
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  • 8
    Electronic Resource
    Electronic Resource
    Toxicity of Metals and Pesticides Using the Sperm Cell Bioassay with the Sea Urchin Arbacia spatuligera (1999)
    Springer
    Bulletin of environmental contamination and toxicology 62 (1999), S. 749-757 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001289900936
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  • 9
    Electronic Resource
    Electronic Resource
    Cloning and expression of Candida guilliermondii xylose reductase gene (xyl1) in Pichia pastoris (1998)
    Springer
    Applied microbiology and biotechnology 49 (1998), S. 399-404 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A xylose reductase gene (xyl1) of Candida guilliermondii ATCC 20118 was cloned and characterized. The open reading frame of xyl1 contained 954 nucleotides encoding a protein of 317 amino acids with a predicted molecular mass of 36 kDa. The derived amino acid sequence of C. guilliermondii xylose reductase was 70.4% homologous to that of Pichia stipitis. The gene was placed under the control of an alcohol oxidase promoter (AOX1) and integrated into the genome of a methylotrophic yeast, Pichia pastoris. Methanol induced the expression of the 36-kDa xylose reductase in both intracellular and secreted expression systems. The expressed enzyme preferentially utilized NADPH as a cofactor and was functional both in vitro and in vivo. The different cofactor specificity between P. pastoris and C. guilliermondii xylose reductases might be due to the difference in the numbers of histidine residues and their locations between the two proteins. The recombinant was able to ferment xylose, and the maximum xylitol accumulation (7.8 g/l) was observed when the organism was grown under aerobic conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051189
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  • 10
    Electronic Resource
    Electronic Resource
    Experimental studies on the response of the fish (Notothenia coriiceps Richardson, 1844) to parasite (Pseudoterranova decipiens Krabbe, 1878) and other irritant stimuli at Antarctic temperatures (1999)
    Springer
    Polar biology 22 (1999), S. 417-424 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In order to better understand the immune response of Notothenia coriiceps to Pseudoterranova decipiens larvae and other irritant stimuli, we implanted a catgut suture thread, killed P. decipiens larvae and macerated P. decipiens larvae in the hepatic and muscle tissues of the fish. The response varied according to the tissue concerned and the extent of the lesion. The most noticeable immune response occurred with the implant of parasite larvae macerate in the liver, which indicates immunological memory, since all the captured fish were found infected with P. decipiens. An intense response also occurred after macrophages had infiltrated the cuticle of the implanted dead parasite in the liver, which confirms that the cuticle acts as a physical barrier to the immune system. Nevertheless, the immune response of N. coriiceps does not appear able to eliminate the infection and the fish in nature appear to suffer no adverse clinical effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050436
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