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Wavelength shifts correlation between bear infrared and ultraviolet regions of the LHII bacteriochlorophyll spectrum from Ectothiorhodospira sp

AutorBuche, André
Palabras claveLight-Harvesting Complex
Fecha de publicaciónmay-2001
EditorZeitschrift für Naturforschung
CitaciónZeitschrift für Naturforschung - Section C Journal of Biosciences 56 (5-6): 363-368 (2001)
ResumenBacteriochlorophyll a has a maximum at 258 nm previously related to the ring E ester system interacting with the π-system of the macrocycle. In this work, we compared the effect of lauryldimethylamine-N-oxide (LDAO) and alkaline pH on both the near infrared and the ultraviolet region of the LHII spectrum from Ectothiorhodospira sp. While LDAO induces only a shift of the 850 nm band arising from the Qy transition of the bacteriochlorophyll a, alkaline pH also causes a concomitant and reversible 10-nm shift from 258 to 248 nm. Both shifts have similar apparent pKs (12.3 and 12.6, respectively). Interestingly, the presence of NaCl reduces these pKs values to 11.4 and 11.7.
Descripción6 p., 3 fig. This work has been digitalized and published in 2013 by Verlag Zeitschrift für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution-NoDerivs 3.0 Germany License, which permits to copy and redistribute the material in any medium or format.
Versión del editorhttp://zfn.mpdl.mpg.de/data/Reihe_C/56/ZNC-2001-56c-0363.pdf
Identificadoresdoi: null
issn: 0939-5075
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