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  • 1
    Call number: AWI G5-15-0026
    In: Developments in paleoenvironmental research
    Description / Table of Contents: Contents: Using Natural Archives to Track Sources and Long-Term Trends of Pollution: An Introduction / Jules M. Blais, Michael R. Rosen and John P. Smol. - The Influence of Hydrology on Lacustrine Sediment Contaminant Records / Michael R. Rosen. - The Stability of Metal Profiles in Freshwater and Marine Sediments / P. M. Outridge and F. Wang. - Calculating Rates and Dates and Interpreting Contaminant Profiles in Biomixed Sediments / Zou Zou A. Kuzyk, Robie W. Macdonald and Sophia C. Johannessen. - Contaminants in Marine Sedimentary Deposits from Coal Fly Ash During the Latest Permian Extinction / Hamed Sanei, Stephen E. Grasby and Benoit Beauchamp. - Lake Sediment Records of Preindustrial Metal Pollution / Colin A. Cooke and Richard Bindler. - Lacustrine Archives of Metals from Mining and Other Industrial Activities - A Geochemical Approach / John Boyle, Richard Chiverrell and Dan Schillereff. - Organic Pollutants in Sediment Core Archives / Jennifer B. Korosi, Wenhan Cheng and Jules M. Blais. - Environmental Archives of Contaminant Particles / Neil L. Rose and Meri Ruppel. - Tracking Long-range Atmospheric Transport of Contaminants in Arctic Regions Using Lake Sediments / Jane Kirk and Amber Gleason. - Tracking Long-Range Atmospheric Transport of Trace Metals, Polycyclic Aromatic Hydrocarbons, and Organohalogen Compounds Using Lake Sediments of Mountain Regions / Jordi Catalan. - Using Peat Records as Natural Archives of Past Atmospheric Metal Deposition / Sophia V. Hansson, Richard Bindler and François De Vleeschouwer. - Historical Contaminant Records from Sclerochronological Archives / Jessica Carilli, Branwen Williams, Bernd R. Schöne, Richard A. Krause and Stewart J. Fallon. - Contaminant Records in Ice Cores / Paolo Gabrielli and Paul Vallelonga. - Use of Catalogued Long-term Biological Collections and Samples for Determining Changes in Contaminant Exposure to Organisms / Linda M. Campbell and Paul E. Drevnick. - Tracking Contaminant Transport From Biovectors / Roland Kallenborn and Jules M. Blais. - Using Natural Archives to Track Sources and Long-Term Trends of Pollution: Some Final Thoughts and Suggestions for Future Directions / Jules M. Blais, Michael R. Rosen and John P. Smol. - Index.
    Description / Table of Contents: The human footprint on the global environment now touches every corner of the world. This book explores the myriad ways that environmental archives can be used to study the distribution and long-term trajectories of chemical contaminants. The volume first focuses on reviews that examine the integrity of the historic record, including factors related to hydrology, post-depositional diffusion, and mixing processes. This is followed by a series of chapters dealing with the diverse archives and methodologies available for long-term studies of environmental pollution, such as the use of sediments, ice cores, sclerochronology, and museum specimens.
    Type of Medium: Monograph available for loan
    Pages: XVI, 509 p.
    ISBN: 9789401795401
    Series Statement: Developments in paleoenvironmental research 18
    Branch Library: AWI Library
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of management studies 21 (1984), S. 0 
    ISSN: 1467-6486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of management studies 28 (1991), S. 0 
    ISSN: 1467-6486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: This article argues that ethnography is inadequately understood and recognized within administration science as a method for studying organizational culture. Ethnographic analyses of organizational cultures are largely absent from the administration science literature, primarily because such work derives from a social constructionist understanding of science. The knowledge of organizations thus provided is interpretive, denying the subject—object dichotomy inherent in mainstream empiricist applications of social analysis. In addition, whereas ethnographic analysis and writing is an appropriate method for studying culture, organizational ethnography is substantially different from ethnographic studies of whole (and largely foreign) societies. Formal organizations are both partial and specialized in comparison to general societal organization. The conceptual and practical toolkit the organizational ethnographer brings to the field and the writing table is thus tailored to this particular research arena, and is outlined here.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Archiv der Mathematik 41 (1983), S. 143-146 
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 37 (1990), S. 0 
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Gypsum and anhydrite fabrics observed in trenches and deep (500 m) cores from Bristol Dry Lake, California, USA, exhibit a vertical alignment of crystals similar to the fabric seen in bottom-nucleated brine pond gypsum. However, geochemical and sedimentological evidence indicate that the gypsum formed in Bristol Dry Lake precipitated displacively within the sediment where groundwater saturated with respect to gypsum recharges around the playa margin (groundwater-seepage gypsum). Evidence for displacive growth of gypsum is: (i) the geometry of the deposit, (ii) stable isotopic data and the water chemistry of the brine, and (iii) inclusions of matrix which follow twin planes and completely surround crystals as they grow.The bulk of the gypsum precipitated in the playa occurs around the edges of the playa in the playamargin facies and completely rings the lake. Sulphate concentrations in the groundwater increase toward the gypsum zone in the playa margin. Basinward of this zone, sulphate concentrations decrease sharply to trace element levels in the basin centre brine. Authigenic gypsum is rare in the centre of the playa. Stable (δ18O values measured for gypsum waters of crystallization (GWC) are similar to the values calculated for groundwater in the playa margin and alluvial fan sediments (˜– 6%0), whereas measured brine δ18O values range from + 0·5 to + 3·7%0. Deuterium values measured for groundwater are ˜– 70%0, GWC are ˜– 60 to – 65%0 and brine values are ˜– 57%0. The geometry of the deposit and the chemical data suggest that the water precipitating the gypsum is more closely associated with the groundwater than the brine. However, some mixing between groundwater and brine is likely.Within 100 m of the surface, the gypsum dehydrates to anhydrite, although the same vertically aligned fabric is retained through the diagenetic process. The similarity of displacive vertically aligned gypsum and anhydrite fabrics seen in Bristol Dry Lake to subaqueously deposited gypsum in modern brine ponds indicates that the criteria used to define subaqueous fabrics must be better constrained.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 39 (1992), S. 0 
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Holocene dolomite forms in the sediment of Lake Hayward, a small permanent hypersaline lake in the Clifton-Preston Lakeland System, Western Australia. The geomorphological setting of dolomite formation in Lake Hayward is similar to the Coorong region in South Australia. Unlike in the Coorong region, dolomite in Lake Hayward does not form as a direct precipitate from the lake water, but is of diagenetic origin. This can be deduced from the following features: (1) the dolomite occurs only below 60–70 cm from the sediment-water interface, (2) dolomite occurs as luminescing cement, and (3) dolomite has pristine well-formed rhomb-shaped crystals. The source of magnesium for dolomitization is probably from the concentration on inflowing groundwater by evaporation and the selective removal of calcium by chemical and biological aragonite/calcite precipitation.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Gravity cores of Holocene sediments from a shallow ephemeral lake in the Coorong region (Pellet Lake, southeastern coastal Australia) show a mineral assemblage and sequence particular to its hydrology. The mineralogical sequence above an initial dolomitic siliciclastic sand reflects conditions of increasing salinity in the lower portions of the core (i.e. organic-rich aragonite to magnesite + hydromagnesite + aragonite) followed by a relative decrease in salinity (i.e. magnesite + aragonite + hydromagnesite to aragonite + hydromagnesite) in the upper portions of the core. This sequence is capped by ˜ 0.4 m of micritic dolomite and minor amounts of hydromagnesite, with the relative abundance of dolomite increasing upwards. Three stratigraphically and spatially distinct dolomite units (upper, lower and margin) are recognized using stable carbon and oxygen isotope data, unit cell calculations and MgCO3 mole per cent data of the dolomite.Detailed X-ray diffraction (XRD) analyses of samples with more than 80% dolomite shows that the dolomite is ordered. Average unit cell parameters, calculated from the XRD patterns, indicate that the upper dolomite unit has crystal lattices expanded in the co direction (co= 16.09 Å) relative to ideal dolomite (co= 16.02 Å) and contracted in the ao direction (ao= 4.796 Å) relative to ideal dolomite (ao= 4.812 Å). The mol fraction of MgCO3 in the upper dolomite shows up to 4.0 ±M 2.0 mole per cent excess Mg in the dolomite crystal lattice (calculated from XRD). This unusual dolomite crystal chemistry is probably generated by rapid precipitation from solutions which have greatly elevated Mg/Ca ratios. Transmission electron microscopy reveals that the upper dolomite has a heterogeneous microstructure which also suggests rapid precipitation from solution. The modulated microstructure found in calcium-rich dolomite is completely lacking. Dolomite ordering reflections are present in electron diffraction patterns, but are weak.Stable oxygen and carbon isotope values of the upper dolomite are tightly grouped (ave. δ18O ∼+ 7.55%o, δ13C ∼+ 4.10%o), yet show three upward-lightening oxygen cycles. The oxygen cycles correlate with three upward decreases in the calculated Mg content of the dolomite zone. These cycles may indicate the increased importance of rain-water dilution of the brine at times when the water in the lake was at its shallowest levels.Analyses of the lower dolomite and the margin dolomite suggest that these units precipitated more slowly from less evaporitic brines than the upper dolomite unit. The lower dolomite is close to stoichiometric, has less evaporitic stable isotope values than the upper dolomite, and has only a slightly expanded co-axis. The margin dolomite is Ca-rich, has a more homogeneous microstructure, and has expanded ao and co axes.The abundance of relatively soluble Mg-bearing phases, such as hydromagnesite and magnesite, may supply additional magnesium for the dolomitization of aragonite and calcite during subsequent diagenesis and burial of the sediment. This process may leave a finely laminated dolomicrite deposit which retains little, if any, evidence of evaporite minerals.
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  • 9
    ISSN: 1072-8368
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Guanine nucleotide exchange factors in the Dbl family activate Rho GTPases by accelerating dissociation of bound GDP, promoting acquisition of the GTP-bound state. Dbl proteins possess a ∼200 residue catalytic Dbl-homology (DH) domain, that is arranged in tandem with a C-terminal pleckstrin ...
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  • 10
    ISSN: 1072-8368
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Members of the Wiskott-Aldrich syndrome protein (WASP) family link Rho GTPase signaling pathways to the cytoskeleton through a multiprotein assembly called Arp2/3 complex. The C-terminal VCA regions (verprolin-homology, central hydrophobic, and acidic regions) of WASP and its relatives stimulate ...
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