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  • 1
    Call number: PIK N 454-07-0009
    In: LOICZ reports & studies
    Type of Medium: Monograph available for loan
    Pages: 27 S.
    Series Statement: LOICZ reports & studies 1
    Branch Library: PIK Library
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 34 (1987), S. 0 
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Hydrochemical studies of the Plitvice Lakes and their tributaries (Croatia/Yugoslavia) were coupled with micromorphological investigations on carbonate lake sediments and recent travertines. Karst springs discharge water from aquifers in Triassic and Jurassic dolomites and limestones and collect in lakes, which are ponded behind accreting travertine dams. Waters at springs have a high CO2 partial-pressure (greater than 7000 ppm) and are slightly undersaturated with respect to calcite (saturation index less than —0·03). CO2 partial pressure is quickly reduced in swift running streams, leading to very high supersaturation with carbonate minerals (saturation indices between 0·74 and 0·53). Calcite deposition, however, is restricted to the lake bottoms (formation of lake marl) and to the tufa dams. The annual carbonate precipitating capacity of the system based on water balance and downstream loss of dissolved ions is estimated to be on the order of 10 000 t CaCO3 as cascade deposits (tufa dams) or as micrite in lakes behind the travertine dams. The initial stages of travertine formation as a result of morphological, biological, and chemical factors are (i) moss settling on small ridges in the creek courses, (ii) epiphytes (diatoms and cyanobacteria) settling on the moss surface, (iii) micrite particles resuspending from lake bottoms and being trapped on mucous excretions from bacteria and diatoms, and (iv) inorganic calcite precipitating as sparite at nucleation sites provided by these crystal seeds. Geochemical studies of the lake marl and tufa dams show that amino acids are dominated by aspartic acid. Carbohydrates come from structural polysaccharides of diatoms. The sticky excretions, rich in aspartic acid, are necessary for the initiation of calcite precipitation. They may be a response of algal and bacterial metabolism to environmental stress by either nutrient depletion or high calcium concentrations in ambient waters. The formation of tufa and micrite (lake marl) appears to be initiated by localized biological factors and is not governed by mere calcite supersaturation of the water. Oligotrophy may be an essential precondition for the formation of fresh water carbonate deposits.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 349 (1991), S. 605-608 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FIG. 1 Location of Lake Van, Turkey and sites of giant microbialites along its shore near Tatvan and Adilcevaz (top). Echosounder transects south of Adilcevaz and in the Tatvan Bay showing the enormous sizes and range of depth of the tower-like microbialites (bottom). The discovery of giant ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 346 (1990), S. 419-419 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-Murray et al.{ suggest that the combined pycnocline/chemocline in the Black Sea has risen unexpectedly and at an alarming rate. Their argument rests on the comparison of the RV Atlantis II hydro-graphic station 1445 of March 1969, to the RV Knorr June 1988 station BS3-2, about 30 nm away in the ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 329 (1987), S. 828-831 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A sediment trap recorded the onset and magnitude of the nuclide flux from the North Sea surface to sediments; it was stationed 30 nautical miles (1.852 km) off Bergen at the western side of the Norwegian Channel (60° 29.6' N, 3° 50.4' E, water depth 318 m). The Mark-VI Honjo sediment trap7 ...
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  • 6
    ISSN: 1573-5117
    Keywords: Paraná ; biogeochemistry ; amino acids ; carbohydrates ; factor analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Particulate carbohydrates and particulate amino acids were determined in a set of samples from the Paraná River, Argentina, covering a stretch of over 1300 km. To gain an understanding of the factors which control the concentrations of these organic compounds, a multivariate statistical approach was used (R-mode varimax factor analysis). This technique separated the influence of various sources of organic matter. The floodplain of the middle reach (about 900 km long and 20–30 km wide) was the most significant source controlling the concentrations of particulate carbohydrates (PCH), providing angiosperm debris, phytoplankton and grasses. Particulate amino acids (PAA) concentrations were determined markedly both by contributions from the Paraguay basin, and the lotic and lentic environments of the floodplain. Sugars single out forested tributary basins as sources of bacteria while amino acids point toward the Paraguay River as a major source of biodegraded material; heterotrophic processes, however, appear more clearly depicted with PAA than with PCH. A downstream increase of the PCH/PAA ratio suggests a larger consumption of PAA in the lowermost reaches.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-2932
    Keywords: heavy metals ; TNR ; stream sediments ; Suquía River
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The Suquía is a semiarid (rainfall, 700–900 mm y−1), medium-size (7700 km2) river system located in central Argentina. Its mountainous upper catchment includes pristine areas as well as a variety of human settlements and a reservoir lake. A large city (Córdoba, ca. 1.3 million inhabitants) and a terminal hypersaline lake are included in the middle and lower basin. Total non-residual (TNR) heavy metals (Pb, Cu, Ni, Zn, Mn, and Fe) have been determined in river bed sediments in two seasons (spring and autumn), seeking to establish the factors which control the temporal and spatial variability. The major findings were: a) concentrations of TNR metals were, in general, higher during springtime than during autumn, particularly downstream from the city of Córdoba; b) organic matter played a significant role as a controlling factor wherever it defined reducing conditions, lowering the concentrations of Mn and Fe hydrous oxides; c) a higher organic load (e.g., downstream the city) and more pronounced reducing conditions could be the causes for the increased Fe concentration, probably precipitated as sulfides; d) organic matter exhibited a closer correlation with some TNR metals in autumn, probably caused by a larger capacity for complexation in the biologically-processed organic debris; and, e) the existence of pristine areas in the drainage basin allowed for the calculation of enrichment factors (EF) which show the significance of several environmental impacts in the Suquía system.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-2932
    Keywords: heavy metals ; TNR ; stream sediments ; Suquía River
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The Suquía is a semiarid (rainfall, 700-900 mm y-1), medium-size (7700 km2) riversystem located in central Argentina. Its mountainous upper catchment includes pristine areas aswell as a variety of human settlements and a reservoir lake. A large city (Córdoba, ca. 1.3million inhabitants) and a terminal hypersaline lake are included in the middle and lower basin.Total non-residual (TNR) heavy metals (Pb, Cu, Ni, Zn, Mn, and Fe) have been determined inriver bed sediments in two seasons (spring and autumn), seeking to establish the factors whichcontrol the temporal and spatial variability. The major findings were: a) concentrations of TNRmetals were, in general, higher during springtime than during autumn, particularly downstreamfrom the city of Córdoba; b) organic matter played a significant role as a controlling factorwherever it defined reducing conditions, lowering the concentrations of Mn and Fe hydrousoxides; c) a higher organic load (e.g., downstream the city) and more pronounced reducingconditions could be the causes for the increased Fe concentration, probably precipitated assulfides; d) organic matter exhibited a closer correlation with some TNR metals in autumn,probably caused by a larger capacity for complexation in the biologically-processed organicdebris; and, e) the existence of pristine areas in the drainage basin allowed for the calculation ofenrichment factors (EF) which show the significance of several environmental impacts in theSuquía system.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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