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  • 1
    Series available for loan
    Series available for loan
    Wien [u.a.] : Springer
    Associated volumes
    Call number: S 02.0228(11)
    In: Schriftenreihe der Erdwissenschaftlichen Kommissionen
    Type of Medium: Series available for loan
    Pages: 95 S.
    ISBN: 3211865624
    Series Statement: Schriftenreihe der Erdwissenschaftlichen Kommissionen / Österreichische Akademie der Wissenschaften Bd. 11
    Classification: C.5.2.
    Language: German
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Acta informatica 21 (1984), S. 521-540 
    ISSN: 1432-0525
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Summary It is well known that the word problem for a finite complete rewriting system is decidable. Here it is shown that in general this result cannot be improved. This is done by proving that each sufficiently rich complexity class can be realized by the word problem for a finite complete rewriting system. Further, there is a gap between the complexity of the word problem for a finite complete rewriting system and the complexity of the least upper bound for the lengths of the chains generated by this rewriting system, and this gap can get arbitrarily large. Thus, the lengths of these chains do not give any information about the complexity of the word problem. Finally, it is shown that the property of allowing a finite complete rewriting system is not an invariant of finite monoid presentations.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary ϰ lI-lysogenic cells of Serratia marcescens as opposed to lI +-lysogenic cells, are receptive to further ϰ infection. After superinfection with wild type or several clear plaque mutants killing and lytic response were observed to a varying extent. From some of the surviving cells doubly lysogenic colonies with a lI + and a lI prophage could originate, lI + being dominant and the cells therefore non-receptive. By this property, combined with a special color reaction, the colonies could be easily screened. Evidence is presented that the lI + gene product probably does not interfere with the formation of new phage receptors but that under its influence receptors are masked. Two ϰ mutants resembling int- mutants are described which only rarely give double lysogenization and prophage substitution following superinfection. The phage-coded function normally achieving these reactions is likely to work constitutively after superinfection. Transduction experiments performed with one of the two mutants pointed at integration of ϰ prophage into the host DNA near to the trp gene.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1573-8906
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. The hemocyanins of 10 decapod Crustacea were dissociated and their subunits analyzed by high resolution polyacrylamide electrophoresis (PAGE): 5 brachyuran crabs (Cancer pagurus, Carcinus maenas, Macropipus holsatus, Hyas araneus, Maja squinado), 3 Astacura (Astacus leptodactylus, Homarus americanus, Homarus gammarus) and the spiny lobstersPalinurus vulgaris andPanulirus interruptus 2. All of the species save the spiny lobsters possess a major hemocyanin component sedimenting with 24 S. A second hemocyanin component sedimenting with ca 16 S was found inH. gammarus, M. squinado, C. pagurus andM. holsatus (about 10 per cent in each case) and inA. leptodactylus (about 25 per cent). A second, major blood protein (10–25% of the total blood protein) was observed inH. gammarus where its sedimentation coefficient was 24 S,M. squinado (16 S),H. araneus (24 S) andC. pagurus (16 S). This second protein has no respiratory function. Two such non-respiratory proteins sedimenting with 24 S and 16 S were found inH. americanus. 3. Between 2 and 7 hemocyanin bands were obtained after incubation with sodium dodecylsulfate (SDS) and β-mercaptoethanol and subsequent electrophoresis in polyacrylamide gradients. The average molecular weight was about 75,000 in the crabs, 80,000 in the crayfishes and 85,000 in the spiny lobsters. The non-respiratory proteins yield between one and four chains with molecular weights ranging from 76,000 to 87,000. 4. The hemocyanins were dissociated at pH 9.6 into “native” subunits, but dissociation was not quantitative in several species. By gel filtration, the products were separated into undissociated material and hemocyanin monomers (5 S). InAstacus leptodactylus a dimeric subunit (7 S) was obtained in addition; its components are linked by a disulfide bridge. The subunit mixtures were separated by PAGE into 4 to 6 distinct bands. 5. To establish the total number of different polypeptide chains present in each hemocyanin, the two electrophoretic patterns were related to each other by preparative isolation of “native” subunits and subsequent analysis in SDS-PAGE. The number of different polypeptide chains ranges from four to seven in the species studied by us. In those species which contained both 24 S and 16 S hemocyanin, more different polypeptide chains were found in the 24 S hemocyanin than in the 16 S hemocyanin, the only exception beingHomarus gammarus.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract From the distribution of the scattered intensity in reciprocal space, information on the shape as well as on the strain distribution in nanostructured samples can be obtained. This is exemplified by applying this method to laterally patterned periodic Si/SiGe superlattices as well as to periodic SiGe dot arrays embedded in Si.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on a search for new heavy quarks using data collected by the UA1 experiment during 1983, 1984 and 1985 at the CERN proton-antiproton collider, corresponding to an integrated luminosity of approximately 700 nb−1. Studying events with a muon or an isolated electron, accompanied by one or more jets, we find good agreement between our data and Monte Carlo predictions for the production of charm and beauty, without the need for a new quark. A top quark model, involving the decayW→t $$\bar b$$ and directt $$\bar t$$ production via the strong interaction, is used to determine our detection efficiency for top. This allows us to place an upper limit on the cross section for producing top quarks as a function of the top quark mass. Our analysis is not sensitive to theW→t $$\bar b$$ process alone. By comparing our limit with a calculation of thet $$\bar t$$ cross section, added to theW→t $$\bar b$$ cross section derived from our own measurements ofW →lv, we are able to place a lower limit on the mass of the top quark. From the lowest order (α s 2 ) calculation, using the choice of structure functions andQ 2 scale that give the lowest cross section, we find: $$m_{top} 〉 44GeV/c^2 \left( {95\% c.l.} \right).$$ Including an estimate of the next higher order (α s 2 ) and calculating the cross section with the EUROJET QCD Monte Carlo program using a less extreme choice for the structure functions andQ 2 scale gives: $$m_{top} 〉 56GeV/c^2 \left( {95\% c.l.} \right).$$ A search has also been made for a fourth generation, charge 1/3 quark (b'). Assuming that theb' mass is smaller than that of the top quark and that it can-not be produced inW decays, the mass limits, using the above procedures, are respectivelym b' 〉32 GeV/c2 andm b' 〉44 GeV/c2, both at 95% confidence level.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By means of coherent neutron scattering the temperature dependence of density fluctuations of deuterium in niobium has been measured for three concentrations (2.3, 9.8, and 18% D/Nb). Depending on the scattering vector, the extrapolation to the stability curve for these fluctuations yields temperatures, which are from 2 to 7 times lower than the stability curve for macroscopic fluctuations. Both suppression and anisotropy of the short wavelength stability curves are attributed to the existence of elastic interaction between deuterium atoms.
    Type of Medium: Electronic Resource
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