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  • 1
    Online Resource
    Online Resource
    Dissecting the deep biosphere: retrieving authentic microbial communities from packer-isolated deep crystalline bedrock fracture zones
    Oxford University Press (OUP) ; 2013
    In:  FEMS Microbiology Ecology Vol. 85, No. 2 ( 2013-08), p. 324-337
    Details
    In: FEMS Microbiology Ecology, Oxford University Press (OUP), Vol. 85, No. 2 ( 2013-08), p. 324-337
    Type of Medium: Online Resource
    ISSN: 0168-6496
    URL: Issue
    URL: Article
    DOI: 10.1111/femsec.2013.85.issue-2
    DOI: 10.1111/1574-6941.12126
    RVK:
    WA 15000
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2013
    detail.hit.zdb_id: 1501712-6
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    Hydrogeochemistry of groundwaters in and below the base of thick permafrost at Lupin, Nunavut, Canada
    Elsevier BV ; 2009
    In:  Journal of Hydrology Vol. 373, No. 1-2 ( 2009-6), p. 80-95
    Details
    In: Journal of Hydrology, Elsevier BV, Vol. 373, No. 1-2 ( 2009-6), p. 80-95
    Type of Medium: Online Resource
    ISSN: 0022-1694
    URL: Article
    DOI: 10.1016/j.jhydrol.2009.04.013
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2009
    detail.hit.zdb_id: 240687-1
    detail.hit.zdb_id: 1473173-3
    SSG: 13
    SSG: 14
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  • 3
    Online Resource
    Online Resource
    Microbiological Oxidation of Ferrous Iron at Low Temperatures
    American Society for Microbiology ; 1989
    In:  Applied and Environmental Microbiology Vol. 55, No. 2 ( 1989-02), p. 312-316
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 55, No. 2 ( 1989-02), p. 312-316
    Abstract: Acidophilic iron-oxidizing bacteria were enriched from mine water samples with ferrous sulfate as the substrate at incubation temperatures in the range of 4 to 46°C. After several subcultures at each test temperature except 46°C, which was prohibitive to growth, the rates of iron oxidation were determined in batch cultures. The results yielded linear rates in a semilogarithmic scale. The rate constants of iron oxidation by growing cultures were fitted into the Arrhenius equation, which displayed linearity in the 4 to 28°C range and yielded an activation energy value of 83 ± 3 kJ/mol.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/aem.55.2.312-316.1989
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 1989
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
    SSG: 12
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  • 4
    Online Resource
    Online Resource
    Bacterial Oxidation of Sulfide Minerals in Column Leaching Experiments at Suboptimal Temperatures
    American Society for Microbiology ; 1992
    In:  Applied and Environmental Microbiology Vol. 58, No. 2 ( 1992-02), p. 600-606
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 58, No. 2 ( 1992-02), p. 600-606
    Abstract: The purpose of the work was to quantitatively characterize temperature effects on the bacterial leaching of sulfide ore material containing several sulfide minerals. The leaching was tested at eight different temperatures in the range of 4 to 37°C. The experimental technique was based on column leaching of a coarsely ground (particle diameter, 0.59 to 5 mm) ore sample. The experimental data were used for kinetic analysis of chalcopyrite, sphalerite, and pyrrhotite oxidation. Chalcopyrite yielded the highest (73 kJ/mol) and pyrrhotite yielded the lowest (25 kJ/mol) activation energies. Especially with pyrrhotite, diffusion contributed to rate limitation. Arrhenius plots were also linear for the reciprocals of lag periods and for increases of redox potentials ( d mV/ dt ). Mass balance analysis based on total S in leach residue was in agreement with the highest rate of leaching at 37 and 28°C. The presence of elemental S in leach residues was attributed to pyrrhotite oxidation.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/aem.58.2.600-606.1992
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 1992
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
    SSG: 12
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  • 5
    Online Resource
    Online Resource
    Associations between Adolescents’ Interpersonal Relationships, School Well-being, and Academic Achievement during Educational Transitions
    Springer Science and Business Media LLC ; 2020
    In:  Journal of Youth and Adolescence Vol. 49, No. 5 ( 2020-05), p. 1057-1072
    Details
    In: Journal of Youth and Adolescence, Springer Science and Business Media LLC, Vol. 49, No. 5 ( 2020-05), p. 1057-1072
    Abstract: A youth’s ability to adapt during educational transitions has long-term, positive impacts on their academic achievement and mental health. Although supportive relationships with parents, peers, and teachers are protective factors associated with successful educational transitions, little is known about the reciprocal link between the quality of these interpersonal relationships and school well-being, with even less known about how these two constructs affect academic achievement. This longitudinal study examined how the quality of interpersonal relationships and school well-being worked together to affect academic achievement during the transition from primary school to lower secondary school. Data were collected from 848 Finnish adolescents (54% girls, mean age at the outset 12.3 years) over the course of sixth and seventh grade. The results support a transactional model illustrating the reciprocal associations between the quality of interpersonal relationships and school well-being during the transition to lower secondary school. As such, the presence of high quality interpersonal relationships promoted higher academic achievement through increased school well-being, whereas high school well-being promoted higher subsequent academic achievement through increased quality of interpersonal relationships. Overall, the results suggest that promoting learning outcomes and helping adolescents with challenges during educational transitions is a critical part of supporting school well-being and the formation of high-quality interpersonal relationships.
    Type of Medium: Online Resource
    ISSN: 0047-2891 , 1573-6601
    URL: Article
    DOI: 10.1007/s10964-019-01184-y
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 2017317-9
    SSG: 5,2
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  • 6
    Online Resource
    Online Resource
    Uranium Mineral – Groundwater Equilibration at the Palmottu Natural Analogue Study Site, Finland
    Springer Science and Business Media LLC ; 1992
    In:  MRS Proceedings Vol. 294 ( 1992-01-01)
    Details
    In: MRS Proceedings, Springer Science and Business Media LLC, Vol. 294 ( 1992-01-01)
    Abstract: The redox-potential, pH, chemical composition of fracture waters, and uraninite alteration associated with the Palmottu uranium mineralization, have been studied. The data have been interpreted by means of thermodynamic calculations. The results indicate equilibrium between uraninite, ferric hydroxide and groundwater in the bedrock of the study site. Partially oxidized uraninite (UO 2.33 ) and ferric hydroxide are in equilibrium with the fresh, slightly acidic and oxidized water type, while primary uraninite is stable with deeper waters that have a higher pH and lower Eh. Measured Eh-pH values of groundwater cluster within a relatively narrow range indicating buffering by heterogenous redox-processes. A good consistency between measured Eh and analyzed uranium oxidation states was observed.
    Type of Medium: Online Resource
    ISSN: 0272-9172 , 1946-4274
    URL: Article
    DOI: 10.1557/PROC-294-497
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1992
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  • 7
    Online Resource
    Online Resource
    Thermodynamic Modelling of Phosphate and Chloride Effects on Solid and Solution Phase Ferric Iron Speciation
    Trans Tech Publications, Ltd. ; 2009
    In:  Advanced Materials Research Vol. 71-73 ( 2009-5), p. 445-448
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 71-73 ( 2009-5), p. 445-448
    Abstract: The purpose of this study was to model, based on thermodynamic equilibrium constants, the effects of chloride and phosphate ion on the speciation of ferric iron in solution and on Fe(III)-precipitates. The thermodynamic modelling was based on the geochemical modelling code PHREEQC and the thermodynamic database WATEQ4F. Increasing phosphate levels (g per L range) increase the complexation of ferric ion with phosphate (FeH2PO42+) with a parallel decrease in ferric sulphate complex (FeSO4+) and release of sulphate as SO42- in solution. Chloride ion at comparable levels and under otherwise similar conditions had negligible effects on the speciation of soluble iron species. In the solid phase analysis, jarosite and goethite species declined with increasing phosphate levels, whereas chloride did not affect the relative proportions of secondary Fe(III) minerals in the solid phase. Saturation index values for jarosites and goethite were dependent on the temperature with the range of phosphate levels (0–20 g/L) examine in this study.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.71-73
    DOI: 10.4028/www.scientific.net/AMR.71-73.445
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2009
    detail.hit.zdb_id: 2265002-7
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  • 8
    Online Resource
    Online Resource
    Thermodynamic Simulation of Sulphide Mineral Leaching
    Trans Tech Publications, Ltd. ; 2009
    In:  Advanced Materials Research Vol. 71-73 ( 2009-5), p. 437-440
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 71-73 ( 2009-5), p. 437-440
    Abstract: Geochemical modeling program PHREEQC was used to simulate generic bioleaching processes. Carbonate minerals (e.g., calcite) dissolve in acid solution, increasing the solution pH and Ca concentration while the concentration of CO2 may be controlled by the equilibrium with the atmospheric CO2. Non-oxidative dissolution of Fe-monosulphides was demonstrated to release H2S and increase the pH. In the absence of ferric iron precipitation (goethite), the oxidation of pyrite decreased the solution pH from 2 to ~1.4, while the oxidation of Fe-monosulphide and chalcopyrite increased the solution pH to ~3.2-3.4. Assuming equilibrium precipitation of goethite, oxidative leaching decreased the solution pH for all three minerals from pH ~2 to ~0.9-1.2. Adjustment of the solution pH to 1.8 or 2.0 with KOH with concurrent equilibrium precipitation of K-jarosite resulted in low dissolved iron concentrations.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.71-73
    DOI: 10.4028/www.scientific.net/AMR.71-73.437
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2009
    detail.hit.zdb_id: 2265002-7
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  • 9
    Online Resource
    Online Resource
    Temperature Effects on Bacterial Leaching of Sulfide Minerals in Shake Flask Experiments
    American Society for Microbiology ; 1991
    In:  Applied and Environmental Microbiology Vol. 57, No. 1 ( 1991-01), p. 138-145
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 57, No. 1 ( 1991-01), p. 138-145
    Abstract: The microbiological leaching of a sulfide ore sample was investigated in shake flask experiments. The ore sample contained pyrite, pyrrhotite, pentlandite, sphalerite, and chalcopyrite as the main sulfide minerals. The tests were performed at eight different temperatures in the range of 4 to 37°C. The primary data were used for rate constant calculations, based on kinetic equations underlying two simplified models of leaching, i.e., a shrinking particle model and a shrinking core model. The rate constants thus derived were further used for the calculation of activation energy values for some of the sulfide minerals present in the ore sample. The chalcopyrite leaching rates were strongly influenced by the interaction of temperature, pH, and redox potential. Sphalerite leaching could be explained with the shrinking particle model. The data on pyrrhotite leaching displayed good fit with the shrinking core model. Pyrite leaching was found to agree with the shrinking particle model. Activation energies calculated from the rate of constants suggested that the rate-limiting steps were different for the sulfide minerals examined; they could be attributed to a chemical or biochemical reaction rather than to diffusion control.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/aem.57.1.138-145.1991
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 1991
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
    SSG: 12
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  • 10
    Online Resource
    Online Resource
    Rare Biosphere Archaea Assimilate Acetate in Precambrian Terrestrial Subsurface at 2.2 km Depth
    MDPI AG ; 2018
    In:  Geosciences Vol. 8, No. 11 ( 2018-11-13), p. 418-
    Details
    In: Geosciences, MDPI AG, Vol. 8, No. 11 ( 2018-11-13), p. 418-
    Abstract: The deep biosphere contains a large portion of the total microbial communities on Earth, but little is known about the carbon sources that support deep life. In this study, we used Stable Isotope Probing (SIP) and high throughput amplicon sequencing to identify the acetate assimilating microbial communities at 2260 m depth in the bedrock of Outokumpu, Finland. The long-term and short-term effects of acetate on the microbial communities were assessed by DNA-targeted SIP and RNA targeted cell activation. The microbial communities reacted within hours to the amended acetate. Archaeal taxa representing the rare biosphere at 2260 m depth were identified and linked to the cycling of acetate, and were shown to have an impact on the functions and activity of the microbial communities in general through small key carbon compounds. The major archaeal lineages identified to assimilate acetate and metabolites derived from the labelled acetate were Methanosarcina spp., Methanococcus spp., Methanolobus spp., and unclassified Methanosarcinaceae. These archaea have previously been detected in the Outokumpu deep subsurface as minor groups. Nevertheless, their involvement in the assimilation of acetate and secretion of metabolites derived from acetate indicated an important role in the supporting of the whole community in the deep subsurface, where carbon sources are limited.
    Type of Medium: Online Resource
    ISSN: 2076-3263
    URL: Article
    DOI: 10.3390/geosciences8110418
    Language: English
    Publisher: MDPI AG
    Publication Date: 2018
    detail.hit.zdb_id: 2655946-8
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