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- W2011088082 abstract "In this study we report a spectroscopic investigation on the structure and stability of Cu(II)-complexes that are formed in a minimum growth medium (MM), normally used for Bacillus subtilis cultures. As other transition metals, Cu(II) compounds are toxic to this bacterium and the toxicity depends on the Cu(II) concentration. MM contained NH4+ ions and asparagine (asn) as the source of inorganic and organic nitrogen. Both ESR and electronic spectra demonstrated the very important role played by the amino acid asparagine in the coordinative behaviour of Cu(II). In particular, three different complexes were evidenced: Cu(H2O)6(2+); Cu(asn)+ and Cu(asn)2. The relative amount of these three species strongly depended on pH, on Cu:asn ratio and on the presence of the phosphate ions. They were identified and evaluated quantitatively by extensive simulation of the electron spin resonance (ESR) spectra recorded in different experimental conditions. The bis-complex was found to be more stable in MM than in an asparagine-containing water solution with the same Cu:asn ratio. A comparison of the spectroscopic results with microbiological investigations is also made." @default.
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- W2011088082 date "2000-02-01" @default.
- W2011088082 modified "2023-09-23" @default.
- W2011088082 title "Cu(II) complexes in bacterial growth medium: electron spin resonance study" @default.
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- W2011088082 doi "https://doi.org/10.1016/s1386-1425(99)00244-9" @default.
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