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  • 11
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    Unknown
    Champaign, Ill. : Periodicals Archive Online (PAO)
    American Music. 1:3 (1983:Fall) 88 
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  • 12
    facet.materialart.
    Unknown
    Champaign, Ill. : Periodicals Archive Online (PAO)
    American Music. 2:3 (1984:Fall) 99 
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  • 13
    ISSN: 1432-2048
    Keywords: Carboxylation efficiency ; Compensation point (CO2) ; Photosynthesis (temperature, humidity) ; Quercus ; Sclerophyll
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The carbon-dioxide response of photosynthesis of leaves of Quercus suber, a sclerophyllous species of the European Mediterranean region, was studied as a function of time of day at the end of the summer dry season in the natural habitat. To examine the response experimentally, a “standard” time course for temperature and humidity, which resembled natural conditions, was imposed on the leaves, and the CO2 pressure external to the leaves on subsequent days was varied. The particular temperature and humidity conditions chosen were those which elicited a strong stomatal closure at midday and the simultaneous depression of net CO2 uptake. Midday depression of CO2 uptake is the result of i) a decrease in CO2-saturated photosynthetic capacity after light saturation is reached in the early morning, ii) a decrease in the initial slope of the CO2 response curve (carboxylation efficiency), and iii) a substantial increase in the CO2 compensation point caused by an increase in leaf temperature and a decrease in humidity. As a consequence of the changes in photosynthesis, the internal leaf CO2 pressure remained essentially constant despite stomatal closure. The effects on capacity, slope, and compensation point were reversed by lowering the temperature and increasing the humidity in the afternoon. Constant internal CO2 may aid in minimizing photoinhibition during stomatal closure at midday. The results are discussed in terms of possible temperature, humidity, and hormonal effects on photosynthesis.
    Type of Medium: Electronic Resource
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  • 14
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A method is presented that allows the quantitative determination of the blood flow in retinal arteries in human beings. Television fluorescein angiograms are used as input. This method does not need any gauge procedures since all the necessary information is taken from the image itself. Also, the patients' eye movements do not introduce errors because their influence is removed by the computer program.
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Foundations of physics 14 (1984), S. 1185-1209 
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New approaches to coherent interaction processes are presented, for the weak and the gravitational interactions. Very large cross sections appear possible. These developments provide new foundations for neutrino and gravitational radiation astronomy.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of environmental contamination and toxicology 29 (1982), S. 153-158 
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Journal of bioenergetics and biomembranes 14 (1982), S. 479-498 
    ISSN: 1573-6881
    Keywords: Oxidative phosphorylation ; F1-ATPase ; nucleotide binding sites ; cooperativity ; nucleotide analogs ; fluorescence ; mechanism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Physics
    Notes: Abstract The present study contributes to the problem of the dynamic structure of mitochondrial F1-ATPase and the functional interrelation of so-called tight nucleotide binding sites. Nucleotide analogs are used as a tool to differentiate two distinct functional states of the membrane-bound enzyme, proposed to reflect corresponding conformational states; they reveal F1-ATPase as a “dual-state” enzyme: ATP-synthetase, and ATP-hydrolase. The analogs used are 3′-naphthoyl esters of AD(T)P, and 2′(3′)-O-trinitrophenyl ethers of AD(T)P. Both types of analogs act inversely to each other with respect to their relative effects on oxidative phosphorylation and on ATPase in submitochondrial vesicles. The respective ratios ofK i versus both processes are 250/1 compared to 1/170. It is also shown that in the presence of the inhibitory 3′-esters oxidative phosphorylation deviates from linear kinetics and that these inhibitors induce a lag time of oxidative phosphorylation depending on the initial pattern of nucleotides available to energized submitochondrial vesicles. The duration of the lag time coincides with the time course of displacement of the analog from a tight binding site. The conclusions of the study are: (a) the catalytic sites of F1-ATP-synthetase are not operating independently from each other; they rather interact in a cooperative manner; (b) F1-ATPase as a “dual-state” enzyme exhibits highly selective responses to tight binding of nucleotides or analogs in its “energized” (membrane-bound) state versus its “nonenergized” state, respectively.
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Molecular biology reports 7 (1981), S. 107-113 
    ISSN: 1573-4978
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Heterogenous nuclear RNA-protein complexes (hnRNP) from adenovirus-2 (Ad-2) infected Hela cells contain most of the virus-specific RNA which is labeled in the nucleus during periods lasting from 45 seconds to 2 hours. Moreover, the percentage of RNA which is Ad-2 specific as monitored by filter hybridization increases progressively from early to late period where it accounts for as much as 50–60% of the labeled RNA. The Ad-2 sequences are found in heterogenous complexes sedimenting between 30 and 200 S the density of which in CsCl (p⊃1.39) as well as in metrizamide (p⊃1.29) seems to be the same as that of the bulk particles. A more detailed analysis with restriction fragments shows that all regions of the Ad-2 genome are represented in these particles.
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 21 (1982), S. 403-405 
    ISSN: 1435-1528
    Keywords: Viscoplastic flow ; internal state variable ; normality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Isothermal rheological behavior is described by free energyφ(ε,p) and potentialΩ(p,P) with $$\dot p = \partial \Omega /\partial P,P = - \partial \phi /\partial P,\sigma = \partial \phi /\partial \varepsilon $$ . A number of usual rheological effects can be explained with only one or two (scalar or tensorial) internal state variablesp.
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 19 (1980), S. 318-321 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Fertigbeton kann als ein körniges Medium betrachtet werden, zwischen dessen Körnern eine geringe Reibung herrscht. Daraus folgt, daß bei Modellversuchen ein Mikrobeton verwendet werden muß, dessen Kornstruktur der des Ausgangsbetons geometrisch ähnlich ist. Es wird gezeigt, daß die Dosierung des dünnflüssigen Zements, die sonst mit Hilfe von geometrisch ähnlichen Abrams-Kegeln vorgenommen wurde, auch durch geometrisch ähnliche Scissometer erreicht werden kann.
    Abstract: Summary Fresh concrete is analogous to a granular medium with very low intergranular friction. It follows that in a model test, a microconcrete with grains geometrically similar to the grains of the concrete of the real structure has to be used. It is shown that the proportion of grout, previously obtained with similar Abrams cones, can also be obtained with similar scissometers.
    Notes: Résumé Le béton frais peut être assimilé à un milieu granulaire à très faible frottement entre les grains. Il en résulte qu'un essai sur modèle réduit nécessite l'emploi d'un microbéton de granulats géométriquement semblables à ceux du béton du prototype. On montre que le dosage en coulis, précédemment effectué avec des cônes d'Abrams semblables, peut aussi être obtenu par des scissomètres semblables.
    Type of Medium: Electronic Resource
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