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  • 1
    Electronic Resource
    Electronic Resource
    Thermodynamic and kinetic aspects of binding and recognition in the cytochrome c/cytochrome c peroxidase complex (1993)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 115 (1993), S. 3665-3669 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00062a035
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  • 2
    Electronic Resource
    Electronic Resource
    Lanthanum complexes of spheroidal carbon shells (1985)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 107 (1985), S. 7779-7780 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00311a102
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  • 3
    Electronic Resource
    Electronic Resource
    The formation of long carbon chain molecules during laser vaporization of graphite (1987)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 109 (1987), S. 359-363 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00236a012
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  • 4
    Electronic Resource
    Electronic Resource
    Potential Physiological Activities of Fungi and Bacteria in Relation to Plant Litter Decomposition along a Gap Size Gradient in a Natural Subtropical Forest (1998)
    Springer
    Microbial ecology 35 (1998), S. 172-179 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The dynamics of fungal and bacterial potential physiological activities during leaf, branch, and bark litter decomposition along a gap size gradient in a subtropical forest was determined using substrate-induced respiration (SIR) with antibiotics selective for fungi and bacteria, respectively. A gap size gradient (1) was under closed canopy; (2) had small gaps with a diameter (≤5m); (3) had small to intermediate gaps (5–15 m diameter); (4) had intermediate to large gaps (15–30 m diameter); and (5) had large gaps (≥30 m diameter). Litter decomposition was studied using a litter bag technique. Fungi had higher SIR than bacteria for each type of litter in any size class of gaps. Gaps 1, 2, and 3 had higher fungal and bacterial SIRs than gaps 4 and 5. Moreover, decomposing leaf litter exhibited higher fungal and bacterial SIRs than branch, and branch higher than bark. Simple correlation analysis indicated that fungal SIR was a reliable index of decomposition rates. Fungal SIR was significantly and positively correlated with soil moisture, whereas bacterial SIR was not significantly correlated with soil moisture. The relationships among microclimatic factors, fungal and bacterial physiological activities, and rates of plant litter decomposition suggest that, in subtropical ecosystems, fungal community activities were strongly and directly regulated by the environmental heterogeneity within gaps, and an important regulator of rates of plant litter decomposition rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002489900071
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  • 5
    Electronic Resource
    Electronic Resource
    Morphological, physiological and enzymatic characteristics of cephalosporin acylase-producing Arthrobacter strain 45-8A (1993)
    Springer
    Archives of microbiology 159 (1993), S. 392-395 
    Details
    ISSN: 1432-072X
    Keywords: Arthrobacter strain 45-8A ; Cephalosporin acylase ; 7-Aminocephalosporanic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A bacterial strain producing cephalosporin acylases was isolated from soil. The morphological and physiological properties of this strain suggest that it belongs to the genus Arthrobacter, and the isolate was therefore designated Arthrobacter strain 45-8A. Substrate specificity of the enzyme was examined. The enzyme can convert both cephalosporin C and 7β-(4-carboxylbutan-amino)cephalosporanic acid to 7-aminocephalosporanic acid. An interesting feature of the acylases is their temperature-dependent regulation. Activity of acylases was detected in strain 45-8A grown at temperature below 30 °C, but was not observed at higher temperature. Arthrobacter strain 45-8A did not exhibit β-lactamase activity, even though its resistance to cephalosporin C was very strong (〉2000 μg/ml). This is quite beneficial for its application in the manufacture of 7-aminocephalosporanic acd.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00290923
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  • 6
    Electronic Resource
    Electronic Resource
    Nitrification Inhibition by Naphthalene Derivatives and Its Relationship with Copper (2000)
    Springer
    Bulletin of environmental contamination and toxicology 64 (2000), S. 542-549 
    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/s001280000037
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  • 7
    Electronic Resource
    Electronic Resource
    Iterative exponential filtering for large discrete ill-posed problems (1999)
    Springer
    Numerische Mathematik 83 (1999), S. 535-556 
    Details
    ISSN: 0945-3245
    Keywords: Mathematics Subject Classification (1991):G65F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary. We describe a new iterative method for the solution of large, very ill-conditioned linear systems of equations that arise when discretizing linear ill-posed problems. The right-hand side vector represents the given data and is assumed to be contaminated by measurement errors. Our method applies a filter function of the form $\varphi_\beta(t):=1-\exp(-\beta t^2)$ with the purpose of reducing the influence of the errors in the right-hand side vector on the computed approximate solution of the linear system. Here $\beta$ is a regularization parameter. The iterative method is derived by expanding $\varphi_\beta(t)$ in terms of Chebyshev polynomials. The method requires only little computer memory and is well suited for the solution of large-scale problems. We also show how a value of $\beta$ and an associated approximate solution that satisfies the Morozov discrepancy principle can be computed efficiently. An application to image restoration illustrates the performance of the method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002119900077
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  • 8
    Electronic Resource
    Electronic Resource
    Occupation Measures of Singularly Perturbed Markov Chains with Absorbing States (2000)
    Springer
    Acta mathematica sinica 16 (2000), S. 161-180 
    Details
    ISSN: 1000-9574
    Keywords: Key words Singularly perturbed Markov chain, Occupation measure, Aggregation, Absorbing state, Weak convergence, Switching diffusion ; 1991MR Subject Classification 60J27, 60B10, 34E05, 60F17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This paper develops asymptotic properties of singularly perturbed Markov chains with inclusion of absorbing states. It focuses on both unscaled and scaled occupation measures. Under mild conditions, a mean-square estimate is obtained. By averaging the fast components, we obtain an aggregated process. Although the aggregated process itself may be non-Markovian, its weak limit is a Markov chain with much smaller state space. Moreover, a suitably scaled sequence consisting of a component of scaled occupation measures and a component of the aggregated process is shown to converge to a pair of processes with a switching diffusion component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s101140050013
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  • 9
    Electronic Resource
    Electronic Resource
    Condensation and structure of amorphous ices: A computational study (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 1512-1513 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458113
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  • 10
    Electronic Resource
    Electronic Resource
    Polar molecules in planar interfaces. Role of the triplet direct correlation function in the asymptotic behavior of the profile (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 4609-4619 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We investigate the density-orientation profile of a polar liquid in planar interfaces. This liquid, which represents one side of the interface, is coupled with a second medium which can be an ideal solid characterized only by its dielectric constant or another polar liquid. We derive an expression for the asymptotic behavior of the profile which is exact provided the molecules interact by an additive pairwise potential. As a consequence of the renormalization of bonds, we show that the result does not depend explicitly on the particular form of the short range part of the pair potential. Moreover, the asymptotic behavior of the profile does not depend on the physical origin of the second medium provided it behaves as a dielectric. In addition, we show that the result remains exact in presence of a soft wall and can be extended to the liquid–vapor interface. As established in a previous paper, we show that the isotropic part of the profile is intimately connected with the electrostriction phenomena observed in bulk phase when a strong electrical field is applied. In order to clarify this point, we derive the expression of the electrostriction constant from the relation density-one body direct correlation function which has been used for studying the profile. We point out that the electrostriction and the long tail of the profile represent two ways for investigating some orientational components of the triplet direct correlation function in bulk phase. More generally, we show that the triplet direct correlation function largely determines the orientational structure of the profile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457722
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