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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 71 (1988), S. 161-167 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents The switching transients in h.v. power systems are mainly influenced by the first lying poles and zeros of the transfer functions. Considering this property a systematic n-port-synthesis is given by using a method of Cauer. The resultant equivalent network can be reduced and thereby the computer time is diminished demanded for the calculation of switching transients.
    Notes: Übersicht Das transiente Verhalten von Hochspannungsnetzen wird bei Schaltvorgängen im wesentlichen durch die ersten Pole und Nullstellen der Übertragungsfunktionen geprägt. Unter Verwendung eines Verfahrens von Cauer wird diese Eigenschaft in der vorliegenden Arbeit bei einer systematischen n-Tor-Synthese berücksichtigt. Auf diese Weise gelangt man zu reduzierten Ersatzschaltbildern, die es gestatten, den numerischen Aufwand zur Berechnung der transienten Vorgänge zu senken.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 80 (1971), S. 284-292 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. Mutant Aspergillus nidulans hyphae containing 7–15% of the normal chitin complement did not lyse in dilute buffer but lysed on continued incubation in growth medium without osmotic stabiliser. Distortion and lysis could occur anywhere along the hypha and were not confined to the apex. 2. Hyphae with a normal chitin content started to distort and lyse 90 min after transfer to medium lacking osmotic stabiliser and at the temperature inhibiting chitin synthesis. Lysis was not confined to the growing tips. 3. Hyphae lacking wall chitin and transferred to conditions where chitin synthesis could proceed, formed stable mycelium at the growing tips and distorted in the older, chitin-poor, regions. Pulse-labelling with N-acetylglucosamine and radioautography showed that, in such hyphae, chitin was incorporated into the wall in the older regions undergoing distortion. 4. The relation between growth—dependent distortion and lysis and the activity and location of autolytic enzymes is discussed.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A mutant of Aspergillus nidulans lacking galactose phosphate-UDP glucose transferase could not grow on galactose but incorporated this sugar into cell constituents when supplied with another carbon source. 75% of the radioactivity taken up was found in the galactose and glucose monomers of the hyphal wall. Most of the remaining label was in a cytoplasmic polysaccharide and in free galactose and galactose phosphate. The composition of the cytoplasmic polysaccharide resembled that of the wall polymers. These findings are taken to indicate that enzymes not connected with the Leloir pathway can activate and epimerise galactose and that polymeric wall precursors may be present in the cytoplasm. The specific labelling obtained with galactose was combined with radioautography to show that glucose and galactose containing polymers are incorporated into the hyphal wall at the growing tip.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 713-715 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The mutant, Ts 6, was one of several temperature sensitive isolates obtained after treating conidia of an adenine and biotin requiring strain with ethane methane sulphonate. All these isolates grew on malt extract glucose agar at 30 C but, unlike the parent strain, could no longer grow at 42 C. ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 336 (1988), S. 526-526 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIRâáá€In their article, Cairns et al.' present results and an interpretation which have already aroused considerable interest and controversy. It is a guiding principle in science that a radical new interpretation (in this case, one invoking the inheritance of acquired ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 38 (1987), S. 339-365 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Es werden langsame, gleichförmige Strömungen einer zähen, inkompressiblen Flüssigkeit um eine starre Kugel in der Nähe einer ebenen Wand betrachtet. Die von der Flüssigkeit auf die Kugel ausgeübten Widerstands- und Querkräfte werden berechnet. Die numerischen Ergebnisse werden mit bestehenden, theoretischen und experimentellen Daten für diese und verwandte Strömungen verglichen. Sie basieren auf einer Randelementmethode für verschiedene, linearisierte Randwertprobleme.
    Notes: Abstract Slow uniform flows of a viscous, incompressible fluid past a rigid sphere near a plane wall are considered. The drag and lateral forces exerted on the sphere by the fluid are computed. The numerical results are compared with existing theoretical and experimental data for these and related fluid flows. They are based on a boundary element method for various linearized boundary value problems.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 271 (1978), S. 244-245 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We postulate a constant rate of surface-area synthesis p that doubles once during the bacterial cycle, d min before division10. For a cylinder with open ends, the cell volume V(a} at age a is given by V(a} = 201"1 [1 -m] for a ^ (m -f- \)i-d for a ^ (m- \)i-d where T is the mean doubling time ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 183 (1981), S. 561-563 
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The extreme polarity shown by operator proximal nonsense mutations in the lacZ gene and the resulting lack of full-length lacZ mRNA have been used to estimate transcriptional errors at such a locus. The resudual β-galactosidase activity in strains carrying lacZ 2 or the same allele with a rho mutation indicate an RNA polymerase error rate of 1.4×10-4.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 191 (1983), S. 207-212 
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Nonsense alleles in the lacZ gene of E. coli do not completely eliminate enzyme activity as errors during protein synthesis allow some chains to be completed. The relative contributions of transcriptional and translational errors to this leakiness were investigated by two methods: the introduction of rho − alleles into extreme-polar mutants and the kinetics of β-galactosidase induction. Virtually all the errors appeared to be transcriptional in the case of two extreme-polar and one non-polar mutation. These alleles should prove useful for further in vivo investigations of RNA polymerase accuracy. With two other non-polar alleles, transcriptional mistakes were low and translational ones high. The frequency of RNA polymerase errors was context-dependent and varied for different nonsense codons in the same position and for the same codon in different positions. The reasons why some alleles showed no activity due to translational errors could not be clearly established. However, increasing the rates of ribosomal errors from one such allele with streptomycin raised the contribution of ribosomal errors to activity markedly and non-linearly. Translational mistakes may give rise to active enzyme only if the monomers are formed at a rate sufficient for effective aggregation to the normal tetramer.
    Type of Medium: Electronic Resource
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  • 10
    Publication Date: 2014-03-21
    Description: Commodity equivalence and population similarity are two widely accepted paradigms for the valid transfer of welfare estimates across resource valuation contexts. We argue that strict adherence to these rules may leave relevant information untapped, and propose a Bayesian model search algorithm that examines the probabilities with which two or more sub-sets of meta-data, each corresponding to a different combination of commodity and population, share common value distributions. Using a large meta-data set of willingness-to-pay for diverse outdoor activities across various regions of the United States as an example, we find strong potential for contexts that would not traditionally be considered as transfer candidates to form information pools. Exploiting these commonalities leads to substantial efficiency gains for benefit estimates.
    Keywords: C11 - Bayesian Analysis, C52 - Model Evaluation and Selection, Q26 - Recreational Aspects of Natural Resources, Q51 - Valuation of Environmental Effects
    Print ISSN: 0002-9092
    Electronic ISSN: 1467-8276
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Economics
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