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green pigments produced by photosynthetic purple and green bacteria. They are localized in the chromatophores of the bacterial cell. Most of the purple bacteria contain bacteriochlorophyll a (bacterio-chlorin), which is similar to chlorophyll a of green plants. Certain purple bacteria contain bacteriochlorophyll b. Green bacteria contain bacteriochlorophyll c or bacteriochlorophyll d (bacterioviridins), which differ significantly in structure from other chlorophylls. Every bacteriochlorophyll has its characteristic absorption spectrum. For example, bacteriochlorophyll a has its main absorption maximum at a wave length of 780 nanometers (nm); bacteriochlorophyll b, at 799 nm; bacteriochlorophyll c, at 660 nm; and bacteriochlorophyll d, at 650 nm.


Kondrat’eva, E. M. Fotosinteziruiushchie bakterii. Moscow, 1963.
Uspenskaia, V. E. “Biosintez bakterial’nykh khlorofillov.” In Uspekhi mikrobiologii, vol. 3. Moscow, 1966.


References in periodicals archive ?
Caption: Figure 1: The connection between the molecular, energetic, and spectral characteristics of the chlorophyll and bacteriochlorophyll molecules.
For comparison, the free energy of 1 mole photon with the wavelength of 660 nm and 800 nm (wavelengths that are characteristic to chlorophyll and bacteriochlorophyll absorption, resp.) is also indicated.
P: primary electron donor; BChl: bacteriochlorophyll; BPheo: bacteriopheophytin; [Q.sub.A]: primary quinone type electron acceptor; [Q.sub.B]: secondary quinone type electron acceptor.