Far red absorbing

Photomorphogenesis, 231 Phycocyanobilin, 237 Phytochrome, 230 molecular weight of, 232 native undegraded, 232 P(r (far-red absorbing form), 236 bilatrene chromophore structure of, 236 photophysical properties of, 236 Pfr — Pr transformation, 234 Pr — Pfr transformation of, 234 chemical nature of individual reaction steps of, 263... 

The chlorophyll molecule (309) is involved in initiating photosynthesis in green plants and contains magnesium coordinated to a partially reduced porphyrin (namely, a chlorin derivative). Life relies ultimately on the unique redox and electron transfer abilities of the chlorophylls which are necessary for the conversion of light to chemical energy. Chlorophyll mainly absorbs light from the far red region of the spectrum... 

Sessler, J.L. et al. (1991) Tripyrroledimethine-derived ("texaphyrin"-type) macrocycles potential photosensitizers which absorb in the far-red spectral region, Proc. SPIE-The International Society for Optical Engineering 1426, 318-329. 

Pt. has a major absorption band in the red (Fig. 4-16), with a peak near 667 nm (the exact location varies with the plant species). Upon absorption of red light, Pr can be converted to a form having an absorption band in the so-called far-red, Pft., with a peak near 725 nm (Figs. 4-15 and 4-16). Actually, the absorption bands of both pigments are rather broad, and many different wavelengths can be absorbed by each of them. As is indicated in Figure 4-16, the maximum absorption coefficients are about 104 m2 mol-1 for both Pr... 

Figure 4-16. Absorption spectra for the red (Pr) and the far-red (Pfr) absorbing forms of phytochrome in aqueous solutions. Note that the absorption spectra presented in this text were obtained at or near room temperature. [Data are replotted from Butler et al., 1965 used by permission.]...

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