Bacteriochlorophylls


Also found in: Dictionary, Thesaurus, Medical.

Bacteriochlorophylls

 

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.

REFERENCES

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

V. M. GORLENKO

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.