bacteriochlorophyll


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bac·te·ri·o·chlo·ro·phyll

(bak-tēr'ē-ō-klōr'ō-fil),
Any form of chlorophyll in photosynthetic bacteria: 1) bacteriochlorophyll a, -CH=CH2 replaced by -CO-CH3 in the chlorophyll α structure, two hydrogens also being added; the photosynthetic pigments of purple bacteria; 2) bacteriochlorophyll b, -CH=CH2 replaced by -CO-CH3 and -CH2-CH3 replaced by -CΞCH in the chlorophyll β structure, two hydrogens also being added.

bacteriochlorophyll

(băk-tîr′ē-ō-klôr′ə-fĭl)
n.
Any of a group of pigments, especially one having the formula C55H74MgN4O6, that absorb light energy used in photosynthesis and that are found in photosynthetic bacteria that do not produce oxygen as a byproduct of photosynthesis.

bacteriochlorophyll

a form of CHLOROPHYLL possessed by photosynthetic bacteria (green and purple types). In addition to small amounts of bacteriochlorophyll, green bacteria mostly possess another type of chlorophyll called bacterioviridin.
References in periodicals archive ?
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.
Although the difference in the degree of the delocalization between the chlorophyll and bacteriochlorophyll pigments is small (note that the delocalization on the B-ring is disrupted and the ethylene group is substituted by acetyl group on the A-ring in bacteriochlorophyll), this difference has great influence on chemical and biological functions.
Figure 2 shows that the electric energy of the [S.sub.0] [right arrow] [S.sub.1] transition of bacteriochlorophyll corresponds to about 770 nm in organic solvent.
Selective release, removal, and reconstitution of bacteriochlorophyll a molecules into the b800 sites of lh2 complexes from Rhodopseudomonas acidophila 10050.
The basic structure of geoporphyrins, especially those with an exocyclic ring in the southern part of the molecule, is strongly suggestive of origin from chlorophylls and bacteriochlorophylls, which are major photosynthetic pigments of photoautotrophs.