Protein tuning of excited-state charge-transfer dynamics in azurin

Article Abstract:

The excited-state charge-transfer dynamics of azurin from Alcaligenes denitrificans (AD) has been measured with resonance Raman spectroscopy. The obtained data are then compared with values for Pseudomonas aeruginosa (PA). Azurin is a 14.6 kDa blue copper protein found in denitrifying bacteria which transports electrons from aromatic amine dehydrogenase to cytochrome c and/or nitrite reductase. Results show that azurin from AD has an inner-sphere reorganizatin energy of 0.26 eV. Differences in azurin for PA and AD are due to the chromophore structure and protein environment at the copper site.

Analysis, Proteins

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Raman vibrational evidence of the presence of conjugated regions in individual micron diameter polystyrene particles irradiated with visible radiation

Article Abstract:

Raman spectroscopy was used to ascertain the existence of conjugated regions in micron diameter particles and correlate their existence with the start of particle luminescence. The spectroscopic studies affirm the presence of polymer backbone conjugation. Raman signals were improved by the photoreduction of silver ion. The development of extensive conjugation regions can be seen by observing the variations of the intensity of the C-H and C=C stretching regions at the same time an individual particle cannot move in the optical trap.

Research, Polystyrene, Chemiluminescence

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