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Mar 14, 2021
. this game is awesome but is not compatible with older pc's..Stable isotope analysis of lithogenic acids in a model of salinization by nano-scale iron-rich sediments.
A study has been carried out to analyse the major lithogenic acids (LAs) of an Atlantic salt marsh (Isle of Portland, UK) contaminated by iron-rich sediments and to assess the potential impact of this contamination on the geochemical and isotopic signature of the LAs. The LAs were isolated from surface seawater and five sediment cores taken in the upper, middle and lower parts of the marsh. The LA composition was investigated by gas chromatography coupled with mass spectrometry. The stable isotope composition was determined by high-temperature combustion isotope-ratio mass spectrometry (IRMS) for elements present in all the LAs, namely carbon and for nitrogen, carbon and sulphur and carbon, nitrogen and sulphur. Two LAs (tetradecanoic acid and hexadecanoic acid) were found in all the sediment cores and in surface seawater, two others (2-hydroxyhexadecanoic acid and 13-hydroxyhexadecanoic acid) were exclusively found in the upper sediment core, the remaining LAs were present in all cores. The LA composition is significantly impacted by iron pollution. Iron-related LAs are characterized by larger isotopic fractionations than common LAs. The magnitude of the isotopic fractionations is non-negligible, from 0.8 to 2.3 per mil for carbon and up to 8.4 per mil for nitrogen. These results demonstrate that the use of carbon and nitrogen isotopes (δ(13)C and δ(15)N) as tracers of LAs is efficient and provides valuable information on LA sources. This study also highlights the importance of analysing LAs in the contaminated sediment.Evaluation of the cochlear microphonic in hearing-impaired subjects.
To compare the sensitivity and dynamic range of the normal and pathological cochlea, it is necessary to measure and compare the cochlear microphonic (CM) in both cases. In this study, we have measured the CM in normal and hearing-impa be359ba680
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