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  • 1
    Series available for loan
    Series available for loan
    Associated volumes
    Call number: SR 93.0767(62)
    In: Excursion guide
    Type of Medium: Series available for loan
    Pages: 54 S.
    ISBN: 9171584005
    Series Statement: 62
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Call number: 93.0024
    In: Physics and chemistry of the earth
    Pages: XI, 564 S.
    Series Statement: Physics and chemistry of the earth 13 & 14
    Language: English
    Branch Library: GFZ Library
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  • 3
    Monograph available for loan
    Monograph available for loan
    Amsterdam [u.a.] : Elsevier
    Call number: 9/M 16.90207
    Description / Table of Contents: "The geochemistry and chemistry of sulfur, iron and iron sulfides in sedimentary systems is reviewed. Sulfur microbiology is described and the microbial ecology of sulfidic sediments is discussed. Sulfur and iron stable isotope biochemistry is addressed against the background of recent advances in this field with respect to sedimentary and microbial systems. Environmental aspects of the present sedimentary sulfur cycle are considered with special references to the development of euxinia and global anoxic events. The biogeochemistry of ancient sulphur-rich sediments is considered and the evolution of the sedimentary sulfur system is discussed against the background of the evolution of the Earth surface environment. The evolution of the sulfur biome and its impact of the early development of life on Earth are discussed."--Cover
    Type of Medium: Monograph available for loan
    Pages: IX, 801 Seiten , Ill., graph. Darst. , 24 cm
    ISBN: 9780444529893
    Series Statement: Developments in sedimentology 65
    Classification: A.3.16.
    Language: English
    Note: Introduction -- Sulfur chemistry in aqueous solutions -- Sedimentary iron biogeochemistry -- Aqueous metal-sulfide chemistry: complexes, clusters and nanoparticles -- Metastable sedimentary iron sulfides -- Sedimentary pyrite -- Metal sequestration by sedimentary iron sulfides -- Microbial sulfate reduction in sediments -- Microbial sulfide oxidation in sediments -- Microbial ecology of sulfidic sediments -- Sedimentary sulfur isotope biogeochemistry -- Iron isotope fractionation in sedimentary sulfides -- Euxinic systems -- Sedimentary sulfides -- The geochemistry of sulfidic sedimentary rocks -- Fossil bacteria: evidence for the evolution of the sulfur biome -- The evolution of the sedimentary sulfur cycle..
    Location: Reading room
    Branch Library: GFZ Library
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  • 4
    ISSN: 1432-0827
    Keywords: Osteoblast ; Estrogen ; Cytokine ; Proliferation ; Alkaline phosphatase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The use of primary (nontransformed) bone cell cultures is hampered by their cellular heterogeneity. Primary cultures of osteoblast-like cells have been shown to proliferate in response to several osteotropic agents, but because mixed cell populations are present it is uncertain whether a true osteoblastic response was observed. By combining (1) localization of [3H]-thymidine incorporation into the nuclei of actively dividing cells by autoradiography with (2) subsequent induction of osteoblast differentiation by 1,25(OH)2D3 to optimize the number of cells expressing high alkaline phosphatase activity and (3) its localization by histochemical staining, it is possible to measure the proliferation of cells that are capable of expressing a more mature osteoblastic phenotype in heterogeneous human trabecular bone cell cultures. Over a 72-hour incubation period, rhIL-1α (0.2–2 ng/ml) exerted a dose-dependent stimulation of proliferation of cells expressing alkaline phosphatase. Purified human TGFβ1 produced a biphasic increase in the proliferation of these cells (0.01–1 ng/ml) but 17β and 17α-estradiol (10-12–10-8 M) failed to consistently regulate cell growth. Furthermore, 17β-estradiol did not reproducibly modulate proliferation induced by IL-1α or TGFβ when added together in cultures. This procedure represents a more accurate method for the assessment of osteoblast proliferation in primary bone cell cultures and demonstrates that estrogen is not mitogenic for human osteoblasts and does not potentiate the actions of putative local stimulators of osteoblast replication.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1777
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 364 (1993), S. 395-395 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - We have found geochemically significant concentrations of particulate gold in coals from the South Wales coalfield. We think this is the first described record of native gold in coal which demonstrates direct precipitation of the gold at low temperatures. The few previously reported modern ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 282 (1979), S. 362-363 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] JNS Jacob Berzelius was born 200 years ago in the village of Vaversunda in Sweden, and was to become one of Sweden's greatest, but least appreciated, scientists. Linnaeus, who had died the year before, represented the culmination of descriptive science; Berzelius' birth ushered in the analytical ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 255 (1975), S. 131-133 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Samples of the ore and enclosing rocks were taken both from drill cores and hand specimens from the mine itself. Crushed rock samples were washed and shaken three times for 24 h with acetone. The samples were further crushed to less than 63 /xm with a pestle and mortar cleaned with acetone. Three ...
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-1421
    Keywords: Metals ; pentasulfide ; metal-pentasulfide complexes ; stability constants ; voltammetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract A series of stable pentasulfide complexes of the common base metals, Mn, Fe, Co, Ni, Cu and Zn exist in aqueous solutions at ambient temperatures. Pure sodium pentasulfide was prepared and reacted with the divalent cations of Mn, Fe, Co, Ni, Cu and Zn in aqueous solution at ambient temperature. The S52- complexes were found to exist as determined by voltammetric methods. Pentasulfide complexes with compositions assigned as [M(η1-S5)] and [M2(μ- S5)]2+ occur for Mn, Fe, Co and Ni where only one terminal S atom in the S52- binds to one metal (η1 = mono-dentate ligand or M-S-S-S-S-S, μ = ligand bridging two metal centers or M-S-S-S-S-S-M). Conditional stability constants are similar for all four metals with log β1 between 5.3 and 5.7 and log β2 between 11.0 and 11.6. The constants for these pentasulfide complexes are similar to the tetrasulfide complexes and are approximately 0.4–0.8 log units higher than for comparable bisulfide complexes [M(SH)]+ as expected based on the higher nucleophilicity of S52- compared to HS-. Voltammetric results indicate that these are labile complexes. As with the bisulfide and tetrasulfide complexes, Zn(II) and Cu(II) are chemically distinct from the other metals. Zn(II) reacts with pentasulfide to form a stable monomeric pentasulfide chelate, [Zn(η1-S5)] with log β = 8.7. Cu(II) reacts with pentasulfide to form a complex with the probable stoichiometry [Cu(S5)]2 with log β estimated to be 20.2. As with the other four metals, these complexes are comparable with the tetrasulfide complexes. Discrete voltammetric peaks are observed for these complexes and indicate they are electrochemically inert to dissociation. Reactions of Zn(II) and Cu(II) also lead to significant breakup of the polysulfide. The relative strength of the complexes is Cu 〉 Zn 〉 Mn, Fe, Co, Ni. Cu displaces Zn from [Zn(η1- S5)] and both Cu and Zn displace Mn, Fe, Co and Ni from their pentasulfide complexes.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1572-9893
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
    Type of Medium: Electronic Resource
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