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  • 1
    Electronic Resource
    Electronic Resource
    Arsenic toxicity is not due to a direct effect on the oxidation of reduced inorganic sulfur compounds by Thiobacillus caldus (1996)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 145 (1996), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Thiobacillus caldus is a moderately thermophilic acidophile which has been implicated in the biooxidation of arsenic containing mineral Sulfides. The toxic effects of arsenic on this bacterium are presented here. Addition of arsenite to a growing culture of T. caldus caused a transient increase in the optical density of the culture while causing a simultaneous decrease in cell viability. The increase in optical density was shown to be due to the formation of extracellular sulfur. The oxidation rates of tetrathionate and thiosulfate were decreased by increasing concentrations of arsenite, while in a culture induced to arsenic resistance the rates were not as adversely effected. Sulfur oxidation was also inhibited to the same extent as tetrathionate oxidation, with the oxidation of solid sulfur being slightly more effected than the oxidation of sulfur dissolved in acetone. Thus, bactericidal arsenite causes a transient formation of extracellular sulfur in the culture supernatant of T. caldus yet the toxicity of arsenite is not due to direct inhibitory effects on reduced inorganic sulfur compound oxidation by these bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1996.tb08608.x
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    Paper (German National Licenses)
    Fulltext
  • 2
    facet.materialart.
    Unknown
    Water chemistry of unfiltered groundwater samples from the Fennoscandian Shield deep terrestrial biosphere in 2018 and 2019 (2021)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Description: Copious amounts of organic carbon are stored for long periods of time in deep continental groundwaters. Little is known about its composition and cycling, mainly due to the difficulties in obtaining sample material. Cool fracture waters of different origins can be obtained under clean conditions at Äspö Hard Rock Laboratory (Äspö HRL, Sweden), operated by the Swedish Nuclear Fuel and Waste Management Company (SKB). We sampled groundwater from different depth (171 to 507 meter below sea level) in the bedrock fractures in November 2018 and March-April 2019. We assessed water chemistry and dissolved organic matter composition via stable carbon isotopic and molecular-formula level analysis in recent Baltic Sea-influenced to old saline fracture waters in the granitic Fennoscandian shield. Physicochemical parameters, major ions, water isotopic compositions (δ18O and δD), total nitrogen as well as dissolved organic matter concentration and stable isotopic composition were obtained for unfiltered groundwater samples from different boreholes.
    Keywords: aquifer; BalticSea_Äspö; BalticSea_Kalmar; Calcium; Carbon, organic, dissolved; Carbon, organic, dissolved, standard deviation; Carbon-14, modern, dissolved inorganic carbon; Carbon-14, modern, dissolved organic carbon; Chlorine; Conductivity; DATE/TIME; Elevation of event; Event label; Extraction efficiency; FT-ICR-MS; groundwater; HA2780A_1; Iron; Iron, total; Iron 2+; KA1755A_3; KA2051A01_5; KA2511A_5; KA2862A_1; KA2865A01_1; KA3105A_3; KA3385A_1; KA3510A_2; KA3600F_2; Latitude of event; Longitude of event; Magnesium; Manganese; Nitrogen, total dissolved; Nitrogen, total dissolved, standard deviation; Nitrogen in ammonium; Nitrogen in nitrate; Nitrogen in nitrite; pH; Phosphorus in phosphate; Potassium; SA1229A_1; SA1730A_1; SA2600A_1; Sodium; Sulfide in hydrogen sulfide; Sulfur in sulfate; Sweden; Temperature, water; Type; δ13C, dissolved inorganic carbon; δ13C, dissolved organic carbon; δ18O, water; δ Deuterium, water
    Type: Dataset
    Format: text/tab-separated-values, 1050 data points
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    DATA PANGAEA
  • 3
    facet.materialart.
    Unknown
    Dissolved organic matter composition in the Fennoscandian Shield deep terrestrial biosphere (FT-ICR-MS), 2018 and 2019 (2021)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: Copious amounts of organic carbon are stored for long periods of time in deep continental groundwaters. Little is known about its composition and cycling, mainly due to the difficulties in obtaining sample material. Cool fracture waters of different origins can be obtained under clean conditions at Äspö Hard Rock Laboratory (Äspö HRL, Sweden), operated by the Swedish Nuclear Fuel and Waste Management Company (SKB). We sampled groundwater from different depth (171 to 507 meter below sea level) in the bedrock fractures in November 2018 and March-April 2019. We assessed water chemistry and dissolved organic matter composition via stable carbon isotopic and molecular-formula level analysis in recent Baltic Sea-influenced to old saline fracture waters in the granitic Fennoscandian shield. Molecular-level dissolved organic matter composition via Fourier-transform ion cyclotron resonance mass spectrometry using electrospray ionization in negative mode (FT-ICR-MS, 15 T Bruker Solarix) was done on solid-phase extracted (PPL) DOM extracts. Relative peak intensities from FT-ICR-MS with molecular formula attributions, elemental ratios and compound group classification of the final dataset are given. ICBM-Ocean was used for processing of FT-ICR mass spectra and formula attribution (Merder et al., 2020; doi:10.1021/acs.analchem.9b05659).
    Keywords: aquifer; Aromaticity index, modified; BalticSea_Äspö; BalticSea_Kalmar; Double bond equivalent; Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS, 15 T Bruker Solarix); FT-ICR-MS; groundwater; HA2780A_1; Hydrogen/Carbon ratio; KA1755A_3; KA2051A01_5; KA2511A_5; KA2862A_1; KA2865A01_1; KA3105A_3; KA3385A_1; KA3510A_2; KA3600F_2; Mass of molecular formulas; Molecular formula; Nitrogen/Carbon ratio; Oxygen/Carbon ratio; Peak intensity; Phosphorus/Carbon ratio; Presence/absence; SA1229A_1; SA1730A_1; SA2600A_1; Sulfur/Carbon ratio; Sweden
    Type: Dataset
    Format: text/tab-separated-values, 814592 data points
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    DATA PANGAEA
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