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  • 1985-1989  (152)
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  • 1
    Call number: AWI G4-92-0251
    In: Developments in hydrobiology
    Description / Table of Contents: Contents: Preface / by W. F. Vincent and J. C. Ellis-Evans. - RIVERS AND STREAMS Filamentous green algae in freshwater streams on SignyIsland, Antarctica / by I. Hawes. - The effects of nutrient limitation and stream discharge on the epilithic microbial community in an oligotrophic Arctic stream / by M. A. Hullar and J. R. Vestal. - Microbial communities in southern Victoria Landstreams (Antarctica) I. Photosynthesis / by C. Howard-Williams and W. F. Vincent. - Microbial communities in southern Victoria Landstreams (Antarctica) II. The effects of low temperature / by W. F. Vincent and C. Howard-Williams. - Nitrogen dynamics in two antarctic streams / by C. Howard-Williams, J. C. Priscu and W. F. Vincent. - Benthic algal biomass and productivity in high subarctic streams, Alaska / by J. D. LaPerriere, E. E. Van Nieuwenhuyse and P. R. Anderson. - Broadscale patterns in the distribution of aquatic and terrestrial vegetation at three ice-free regions on Ross Island, Antarctica / by P. A. Broady. - Community structure of benthic invertebrates in interior Alaskan (USA) streams and rivers / by M. W. Oswood. - Variability of macroinvertebrate community composition in an arctic and subarctic stream / by M. C. Miller and J. R. Stout. - Geochemical processes in the Lake Fryxell Basin (Victoria Land, Antarctica) / by W. J. Green, T. J. Gardner, T. G. Ferdelman, M. P. Angle, L. C. Varner and P. Nixon. - LAKES AND PONDS. - Some aspects of iron cycling in maritime antarctic lakes / by J. C. Ellis-Evans and E. C. G. Lemon. - Nitrogen cycling in Arctic lakes and ponds / by V. Alexander, S. C. Whalen and K. M. Klingensmith. - Photon dependence of inorganic nitrogen transport by phytoplankton in perennially ice-covered Antarctic lakes / by J. C. Priscu. - Patterns of energy storage in Pseudoboeckella poppei (Crustacea, Copepoda) from two contrasting lakes on SignyIsland, Antarctica / by A. Clarke, J. C. Ellis-Evans, M. W. Sanders and L. J. Holmes. - Tundra ponds of the Yukon Delta, Alaska, and their macroinvertebrate communities / by J. A. Maciolek. - Vertical distributions of a planktonic harpacticoid and a calanoid (Copepoda) in a meromictic Antarctic lake / by I. A. E. Bayly and D. Eslake. - Physico-chemical characteristics and origin of hypersaline meromictic Lake Garrow in the Canadian High Arctic / by M. Ouellet, M. Dickman, M. Bisson and P. Page. - Meromixis in an Antarctic fjord; a precursor to meromictic lakes on an isostatically rising coastline / by J. B. Gallagher, H. R. Burton and G. E. Calf. - Chemical characteristics of pond waters in the Labyrinth of southern Victoria Land, Antarctica / by T. Torii, S. Nakaya, O. Matsubaya, G. I. Matsumoto, N. Masuda, T. Kawano and H. Murayama. - Biogeochemical study of organic substances in Antarctic lakes / by G. I. Matsumoto. - Vertical distribution of organic constituents in an Antarctic lake: Lake Fryxell by G. I. Matsumoto, K. Watanuki and T. Torrii. - Perennially ice-covered Lake Hoare, Antarctica: physical environment, biology, and sedimentation by R. A. Wharton Jr, G. M. Simmons Jr and C. P. McKay. - Geographical index. - Map index.
    Description / Table of Contents: Scientific interest in the Antarctic continues to accelerate and limnological research in the area is expanding accordingly. Continued commercial exploitation of mineral resources in the Arctic and the potential for similar developments in the Antarctic have heightened environmental concern and the need for ecological information. This volume brings together limnologists from both polar zones to draw attention to the distinctive features that high latitude aquatic ecosystems have in common, and to the marked contrasts between and within each zone. Twenty-two papers encompass a broad range of new research including the unique geochemistries, insect and zooplankton dynamics, algal community structure and growth characteristics, and microbial ecology of high latitude lakes and rivers. The volume will be a reference source for limnologists and other environmental scientists with an interest in high latitude waters, and for those involved in environmental impact assessments in Antarctica or the Arctic.
    Type of Medium: Monograph available for loan
    Pages: 322 S. : graph. Darst.
    ISBN: 9061936608
    Series Statement: Developments in hydrobiology 49
    Branch Library: AWI Library
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 24 (1985), S. 6370-6374 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 148 (1987), S. 25-28 
    ISSN: 1432-072X
    Keywords: Oxygen affinity ; Anaerobiosis ; Superoxide ; Rumen fungus ; Hydrogen production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mass spectrometric determinations of O2 affinities by the rumen fungus Neocallimastix patriciarum indicated a stable respiration under liquid phase O2 concentrations up to 10 μM, the apparent K m for O2 under these conditions was 4.0 μM. Exposure to O2 concentrations in excess of 10 μM resulted in rapid inactivation of the observed respiration. Calculated H2 evolution rates for the organism are 8.1 nmol min-1 per mg of protein. Exposure to liquid-phase O2 concentrations in excess of 1.4 μM caused 50% inhibition of H2 production. That superoxide and peroxide are amongst the products of respiration was shown by the use of ESR spectroscopy with the spin trapping agent 5,5-dimethyl-l-pyrroline-N-oxide. An active superoxide dismutase was present, but catalase could not be detected.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 3038-3048 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Dissociative adsorption of oxygen on certain (100) metal surfaces has been modeled as random dimer adsorption onto diagonally adjacent empty sites of a square lattice subject to the additional constraint that all six neighboring sites must be empty (the 8-site model). Here we adapt this model to analyze the nonequilibrium c(2×2) ordering recently observed for oxygen on Pd(100) at coverages up to saturation (〉1/4 monolayer), under conditions of low temperature and high pressure where effects of diffusive mobility can be ignored. We do, however, propose that adsorption could be followed immediately by short range transient mobility to dissipate excess energy. We first show how exact master equations for this model can be used to obtain analytic expressions for various local quantities of interest: the probability of an empty 8-site configuration (which determines the sticking coefficient), the c(2×2) island edge or domain boundary densities, etc. They also provide a characterization of, e.g., the asymptotic decay of spatial correlations. Near-percolating (percolative) c(2×2) ordering is readily observed in computer simulations of the saturation state. Through a simple extension of the physical model, we provide a framework for analysis of the large scale characteristics of this ordering via correlated polychromatic percolation theory. Corresponding scaling relations and some real space renormalization group analysis are described. Simulation results for average sizes, the effective dimension, and perimeter length to size ratios, of c(2×2) islands, are also presented.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 2795-2810 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Models where pairs, triples, or larger (typically connected) sets of sites on a 2D lattice "fill'' irreversibly (described here as dimer, trimer, ... filling or adsorption), either randomly or cooperatively, are required to describe many surface adsorption and reaction processes. Since filling is assumed to be irreversible and immobile (species are "frozen'' once adsorbed), even the stationary, saturation state, which is nontrivial since the lattice cannot fill completely, is not in equilibrium. The kinetics and statistics of these processes are naturally described by recasting the master equations in hierarchic form for probabilities of subconfigurations of empty sites. These hierarchies are infinite for the infinite lattices considered here, but approximate solutions can be obtained by implementing truncation procedures. Those used here exploit a shielding property of suitable walls of empty sites peculiar to irreversible filling processes. Accurate results, including saturation coverage estimates, are presented for random filling of dimers, and trimers of different shapes, on various infinite 2D lattices, and for square tetramers on an infinite square lattice.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 1855-1865 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In the energy sudden (ES) approximation for nonreactive molecular collisions, there exist factorization relations by which an arbitrary T-matrix element can be predicted as a spectroscopic linear combination of those out of some other, input state. These were first discovered for ground state input but this restriction was later removed. This general form of the spectroscopic factorization relations is straightforwardly extended here to ES dissociative collisions. One finds that in predicting dissociation amplitudes out of some state, it is necessary to use input data out of a higher (energy) bound state. Thus ground state factorization relations cannot be used. The structure of two natural forms of the factorization relation coefficients (equivalent by virtue of ES consistency conditions among T-matrix elements out of a single state) are analyzed in detail for a collinear atom-truncated square-well diatomic oscillator system. Relevance of these results to the prediction of (dissociative) state specific vibrational enhancement/inhibition is discussed.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 1637-1647 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Local, i.e., multiplicative, operators satisfy well-known linear factorization relations wherein matrix elements (between states associated with a complete set of wave functions) can be obtained as a linear combination of those out of the ground state (the input data). Analytic derivation of factorization relations for general state input data results in singular integral expressions for the coefficients, which can, however, be regularized using consistency conditions between matrix elements out of a single (nonground) state. Similar results hold for suitable "symmetry class'' averaged matrix elements where the symmetry class projection operators are "complete.'' In several cases where the wave functions or projection operators incorporate orthogonal polynomial dependence, we show that the ground state factorization relations have a simplified structure allowing an alternative derivation of the general factorization relations via an infinite matrix inversion procedure. This form is shown to have some advantages over previous versions. In addition, this matrix inversion procedure obtains all consistency conditions (which is not always the case from regularization of singular integrals).
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 5991-6003 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A two-Hilbert space formalism is first used to develop a general class of representations for the quantum mechanics of N-particle reactive systems. Here the N-particle Hilbert space HN is supplemented by a larger arrangement channel space CN of vectors with Hilbert space valued components for each N-particle clustering, and an injection mapping of HN vectors into "physical'' CN vectors. Such representations, for which components of the latter vectors carry an appropriate physical clustering interpretation, provide a rigorous and flexible basis for describing the statistical mechanics of reactive fluids, where atoms and molecules are treated on an equal footing (the molecular picture). Corresponding equilibrium multispecies fugacity or virial expansions follow immediately. Here we focus on analysis of the (previously derived) arrangement channel BBGKY hierarchy for a system where recombination and dissociation, as well as exchange reactions, occur. This formulation (coupled with a corresponding scattering theory) automatically suggests a reactive Boltzmann ansatz which incorporates (standard) noninteracting asymptotic dynamics only for two-molecule nonreactive and reactive exchange collisions. In contrast, e.g., with three molecule recombination, two-molecule dynamics for all three pairs is included (as required for a description of recombination via gradual stabilization of metastables). Finally we compare the resulting reduced form of appropriate channel space hierarchy equations, for a process involving dimer formation and decay, with the corresponding kinetic equations of Lowry and Snider.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Pharmacology 27 (1987), S. 169-191 
    ISSN: 0362-1642
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Medicine , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 91 (1987), S. 3828-3829 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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