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  • 1
    Call number: S 99.0191(289)
    In: Report
    Type of Medium: Series available for loan
    Pages: 34 S.
    Series Statement: Report / Max-Planck-Institut für Meteorologie 289
    Classification:
    Geodetic Measurement Systems
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Call number: ZSP-686-289
    In: Report
    Type of Medium: Monograph available for loan
    Pages: 34 S. : Abb. davon 1 farb. ; 30 cm
    ISSN: 0937-1060
    Series Statement: Report / Max-Planck-Institut für Meteorologie 289
    Branch Library: GFZ Library
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  • 3
    Call number: 1.2/N 02.0381
    Type of Medium: Monograph available for loan
    Pages: 311 S.
    Edition: 1. Aufl.
    ISBN: 3861171376
    Series Statement: Langenscheidts Fachwörterbücher
    Classification:
    E.5.
    Location: Reading room
    Branch Library: GFZ Library
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  • 4
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The salt-regulated accumulation of flavodoxin encoded by the isiB gene and its possible function were investigated in the cyanobacterium Synechocystis sp. strain PCC 6803. In Northern blot experiments, a slight increase of the isiB-specific mRNA was observed in salt-shocked and salt-acclimated cells. High levels of flavodoxin protein were detected in cells acclimated to 342 mM NaCl. In order to analyze the function of flavodoxin in cyanobacterial salt acclimation, an insertion null mutant of isiB was constructed. It was possible to adapt this mutant to raised salt concentrations and, as expected, to low iron contents. Salt-acclimated cells of wild type (WT) Synechocystis display increased activity of photosystem I (PSI), primarily used for increased cyclic electron transport capacity (Jeanjean et al. 1993, Plant Cell Physiol 34: 1073–1079). In salt-acclimated cells of the flavodoxin null mutant, the level of cyclic electron flow was lower than in wild type cells. It was concluded that flavodoxin plays a role as an alternative electron carrier, used for cyclic electron flow in salt-treated Synechocystis cells.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 6 (1999), S. 37-42 
    ISSN: 1434-601X
    Keywords: PACS: 23.20.Lv Gamma transitions and level energies – 27.70.+q 150 〈 A 〈 189
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: High-spin states in 167Hf, populated in the 141Pr(30Si, p3n)167Hf reaction, have been studied using the nordball Ge detector array. Three rotational cascades have been observed for the first time and the previously-known level scheme has been extended to significantly higher spin. Band-crossing effects are discussed within the framework of Woods-Saxon cranking calculations and are found to be in good agreement.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-2048
    Keywords: Key words:Commelina (H+-ATPase) ; C-terminal autoinhibitory domain ; Fusicoccin ; H+-ATPase ; 14-3-3 protein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The plant plasma-membrane H+-ATPase (EC 3.6.1.35) contains a C-terminal autoinhibitory domain whose displacement from the catalytic site is caused by treatment of intact plant tissue with the phytotoxin fusicoccin (FC). The FC-induced activation of the H+-ATPase was proposed to involve a direct interaction of 14-3-3 proteins with the H+-ATPase. By analysing plasma membranes derived from leaves of Commelina communis L., direct biochemical evidence has now been obtained for a complex between the C-terminus of the H+-ATPase and a 14-3-3 dimer. Stabilization of this complex was achieved by FC treatment in vivo or in vitro. Furthermore, the C-terminal domain of the H+-ATPase in association with a 14-3-3 dimer is essential for the creation of a functional FC-binding complex.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-072X
    Keywords: Key words Chaperone ; Cyanobacteria ; groEL ; isiA ; RNA helicase ; Salt stress ; Subtractive RNA ¶hybridization ; Synechocystis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To identify genes transcribed preferentially under salt stress, a subtractive RNA hybridization procedure was applied to the cyanobacterium Synechocystis sp. PCC 6803. The screening of a genomic library led to the identification of several RNA species that were more abundant in salt-stressed cells than in control cells. Salt-dependent transcription of the identified genes was verified in Northern blot experiments. In addition to the previously characterized genes cpn60 (encoding GroEL; a molecular chaperone) and isiA (encoding a chlorophyll-binding protein), genes encoding a protein of unknown function (slr0082) and a putative RNA helicase (slr0083) were identified as salt-regulated genes in Synechocystis. Genes slr0082 and slr0083, located at sites adjacent to each other on the Synechocystis chromosome, were transcribed from separate promoters and showed the most significant induction 1–3 h after salt shock. The salt-regulated promoters of these two genes were mapped. Genes cpn60, slr0082, and slr0083 were also found to be induced by a cold shock. The possible role of the identified gene products for salt adaptation of Synechocystis is discussed.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-072X
    Keywords: Key words Cyanobacteria ; Glucosylglycerol-phosphate ; synthase/phosphatase ; Ions ; Osmolytes ; Salt activation ; Synechocystis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The response of cyanobacteria to a changing osmotic environment includes the accumulation of organic osmolytes such as glucosylglycerol. The activation of the enzymes involved in glucosylglycerol synthesis [glucosylglycerol-phosphate synthase (GGPS) and glucosylglycerol-phosphate phosphatase (GGPP)] in Synechocystis sp. strain PCC 6803 by various salts and salt concentrations was investigated in vitro. GGPS seemed to be the target for salt-mediated regulation of glucosylglycerol synthesis in vitro. GGPS activation was dependent on the concentration of NaCl, and a sigmoidal plot was obtained. Sensitivity to NaCl was markedly enhanced by low Mg+2 concentrations (optimal at 4 mM), but Mg2+ was not absolutely necessary for the Na+ stimulation. As in the case of NaCl, other salts (including MgCl2) stimulated GGPS. The relative order of GGPS activation in the presence of chloride by the cations at constant ionic strength was Li+ 〉 Na+ 〉 K+, Mg2+ Mn2+. No absolute dependence on ionic strength was observed in Mg2+/Na+-exchange experiments. The degree of activation by ions at various concentrations was positively related to the increasing destabilizing properties of the cations according to the Hofmeister rule, where chaotropic cations are most efficient. Cations were responsible for activation since chaotropic anions counteracted the activating effect of cations.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 171 (1999), S. 214-217 
    ISSN: 1432-072X
    Keywords: Key words Cyanobacteria ; Periplasmic proteins ; Salt ; adaptation ; Synechocystis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Periplasmic proteins were obtained from control cells and salt-adapted cells of the cyanobacterium Synechocystis sp. PCC 6803 using the method of cold osmotic shock. Two of these proteins (PP 1, apparent mol. mass 27.6 kDa, and PP 3, apparent mol. mass 39.9 kDa) were accumulated in high amounts in the periplasm of salt-adapted cells, while the major periplasmic protein (PP 2, apparent mol. mass 36.0 kDa) was accumulated independently from salt. After isolation from gels and partial sequencing, the proteins could be assigned to proteins deduced from the complete genome sequence of Synechocystis. Neither salt-induced periplasmic proteins (PP 1, Slr0924 and PP 3, Slr1485) exhibited sequence similarity to proteins of known function from databases. The major protein (PP 2-Slr0513) showed significant sequence similarities to iron-binding proteins. All proteins included typical leader sequences at their N-terminus.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Giant iron-ore deposits, such as those in the Hamersley Province of northwestern Australia, may contain more than a billion tonnes of almost pure iron oxides and are the world's major source of iron. It is generally accepted that these deposits result from supergene oxidation of host banded iron formation (BIF), accompanied by leaching of silicate and carbonate minerals. New textural evidence however, shows that formation of iron ore at one of those deposits, Mount Tom Price, involved initial high temperature crystallisation of magnetite-siderite-iron silicate assemblages. This was followed by development of hematite- and ferroan dolomite-bearing assemblages with subsequent oxidation of magnetite, leaching of carbonates and silicates and crystallisation of further hematite. Preliminary fluid inclusion studies indicate both low and high salinity aqueous fluids as well as complex salt-rich inclusions with the range of fluid types most likely reflecting interaction of hydrothermal brines with descending meteoric fluids. Initial hematite crystallisation occurred at about 250 °C and high fluid pressures and continued as temperatures decreased. Although the largely hydrothermal origin for mineralisation at Mount Tom Price is in conflict with previously proposed supergene models, it remains consistent with interpretations that the biosphere contained significant oxygen at the time of mineralisation.
    Type of Medium: Electronic Resource
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